Permanent magnet synchronous motor

Permanent magnet synchronous motor in the 1950 s.Its operation principle is the same as the ordinary electric excitation synchronous motor,but it to replace the field winding,permanent magnet motor structure more simple,improve the www.dongfeng-motor.com reliability of the motor running. With the development of power electronic technology and microcomputer,in the 1970 s,began to permanent magnet synchronous motor is applied to ac variable frequency speed regulation system.In the 1980 s,the development of rare earth permanent magnet material breakthrough Progress,especially the residual magnetism,high coercive force large and low prices of the third generation of new type of NdFeB permanent magnet materials (NdFeB),greatly promote the development of permanent magnet synchronous motor speed regulating system.

In particular I Are a large country with a rare earth materials,rare earth reserves and extraction of rare earth metals are the highest in the world.With the continuous permanent magnet motors for sale development of rare earth materials and technology,permanent magnet magnetic energy product has been high,the price also should meet the industry early The need of use,combined with vector control level unceasing enhancement,the permanent magnet synchronous motor is more and more big show high efficiency and power density,wide speed range and small ripple torque,etc.The advantages of high performance.In the rare earth permanent magnet materials in China And the scientific research level of rare earth permanent magnet motor has reached the international advanced level.

The application of the new type of permanent magnetic material in motor not only promote the motor structure,the design method and manufacturing process of the reform,but also ac three phase motormakes the permanent magnet synchronous .The performance of the motor have a qualitative leap,rare earth permanent magnet synchronous motor is high-power (ultra high speed,high torque) the direction of miniaturization,intelligent,high-performance,become an important branch in the field of ac speed regulation [1] [2]. Due to the power switch components,permanent magnetic material and drive control technology development level,the permanent magnet synchronous motor with rectangular wave form at first,on the principle and control single phase capacitor start induction motormode basically similar to dc motor,but it Kind of motor torque is larger fluctuations.In order to overcome this shortcoming,people on the basis of and developed the sine wave with position sensor,inverter driven permanent magnet synchronous motor,this makes the permanent magnet synchronous motor The broader prospects.

The maintenance of construction machinery used in motor brush?

(1) brush label shall comply with the working characteristic of motor,shall not be used on 1 electric motor brush two different symbols.(2) there should be no shaking of the brush in the brush and stagnation phenomenon,brush and brush holder should 220v electric motor be 0.10 ~ 0.20 mm gap between brush edge to the slip ring or distance on the surface of the commutator with 2 ~ 4 mm advisable.(3) the brush and the connection of copper braid,the connection of copper braid and brush holder shall be ensure good contact perkins diesel generator and secure. Copper braid shall not and motor rotational part to touch or touch shell grounding.(4) the brush on the slip ring or commutator pressure numerical should comply with the regulations of brush label and manufacturing plants,or adjust to the lowest pressure,no sparks in general is 0.15 ~ 0.25 KGF/cm~2 (5) brush wear IE2/IE3 electric motor degree,shall not be more than two-thirds of the original standard height.(6) after brush wear,should be replaced by the original label,and will contact with glass sand,make www.dongfeng-motor.com the contact area of not less than 75%.

Motor USES the application

Is the most widely used in all kinds of motor ac asynchronous motor (also known as induction

motor).Is it convenient to use,reliable operation,low cost,firm structure,but power factor is low,speed is also more difficult.220v ac electric motors The large capacity of low speed synchronous motor is commonly used engine motor motor (see synchronous motor).Synchronous motor power factor is high,and its speed has nothing to do with the size of the load,only depends on the power grid frequency.Work more stable.In wide scope use dc motor speed control occasions.But it has a commutator,the structure is complex,expensive,maintenance difficulties,not suitable for bad environment.Since the 1970 s,with the development of Motor vehicle power electronic technology,ac motor speed control technology is mature,equipment increasingly lower prices,already applied.

Motor work in the prescribed format (continuous duty system,short-time duty system,intermittent cycle) can assume and will not cause the maximum output mechanical power of the motor overheating is called its rated power,should pay attention to when using the provisions of the nameplate.Must be noticed when the motor running to make it match the load characteristics and the characteristics of the motor,avoid www.facebook.com/guohong.trading coasters or shut down.Electric function provides a large range of power,class from milliwatts to kilowatts.The use of the motor and control is very convenient and has since starting,acceleration,braking,reverse and stopper live ability,can meet various operation requirements; The work efficiency of the motor is higher,and without dust,smell,no pollution,noise is small.Because of its series of advantages,so in industrial and agricultural production,transportation,national defense,commercial and household appliances,medical electrical equipment and so on various aspects are widely used.General 220v ac electric motors motor drive its output power will change with the rotational speed.

The power causes overheat the motor has the following kinds

A the power supply voltage is too high,when the supply voltage is too high,counter electromotive

force of the motor,the magnetic flux and magnetic flux density increase.Due to the size of the iron loss and magnetic flux density is proportional to square of iron loss increase,lead to core overheating.And magnetic flux increasing,and the excitation current component has increased dramatically,due three phase induction motor to the stator winding copper loss increase,make the winding overheating.Therefore,the power supply voltage exceeds the rated voltage of the wholesalemotor.blogspot.com motor,motor overheating.

B,power supply voltage is too low,the power supply voltage is too low,if the electromagnetic torque of the motor remains unchanged,flux will reduce,the rotor current increases accordingly,load power component in stator current increase,caused by winding the copper loss increase,cause,rotor winding overheating.C,asymmetric motor power supply voltage,the motor when the ac geared motor power cord a phase circuit,the fuse fuse,or knife starting equipment led to a phase Angle head burns impassability,will cause single-phase,three-phase motor which run by large current of two phase winding overheating,and burned.D,unbalanced three-phase power supply,when unbalanced three-phase power,can make the unbalanced three phase current of the motor,causing winding overheating.From the above,when motor overheating,should first consider the power of reason.Confirm the power 220v ac electric motors aspects have no problem,then to consider other factors.

High efficiency motor energy saving effect is remarkable Huge market upside

Efficient motor is refers to the general standard motor has high efficiency.Efficient motor using new motor design,new technology and new materials,by reducing the wastage of the electromagnetic energy,heat energy and mechanical energy,improve the output efficiency.Compared with the standard motor,motor using efficient energy-saving effect is very obvious,normally efficiency can be increased by 4% on average.Figures show that China's industrial production of energy waste is serious,the motor power consumption accounts for 64% of the total electricity consumption in our country,based on the analysis of domestic motor application,most still ac electric motor is given priority to with ordinary motor,represented by efficient motor energy saving products market space is huge.Efficient motor is refers to the general standard motor has high efficiency.Efficient motor using new motor design,new technology and new materials,by reducing the wastage of the electromagnetic energy,heat energy and mechanical energy,improve the output efficiency.Compared with the standard motor,motor using efficient energy-saving effect is very obvious,normally efficiency can be increased by 4% on average.Statistics show that's about 1.7 billion kilowatts,annual power consumption of about 3 trillion KWH,motor power consumption accounted for 64% of China's total power consumption,industrial electricity 75% efficient motor in domestic existing stock motor proportion less than 5%,the production of high efficiency motors are mainly sold to electric motor foreign countries.

At the same time,the application of highly efficient motor in China at present is only 23% ~ 23%.Although our country in 2008 will be included in motor system energy saving country one of the ten major energy conservation projects,www.dongfeng-motor.com 2009 also include high efficiency,super efficient motor application in huimin engineering,June 2,2010,according to the notice will be highly efficient motor in energy-saving products huimin project scope,make efficient motor marketing focus.Embarrassing situation is that the high efficient motor has promotion on the market for many years,high efficiency motor has not fully integrated into the market,at present efficient motor proportion is still relatively low.Efficient motor research and development in our country basic keep pace with the international level,the technical progress in recent years,very optimistic,especially on the motor efficiency and abroad there is no difference.But it is a pity that our country produce IE3 motors domestic application of too little,most for export.Domestic well-known motor expert member of ren-yuan tang said.Statistics from the ministry of industry and information technology,according to the current domestic with motor in efficient accounted for only about 5%.To solve the problem of efficient motor in domestic promotion difficult,China's government departments to the New Deal is constantly,in order to promote the development of industry.

Energy efficiency standards 2012 China once in order to speed up the promotion of high efficiency motor,organized to GB18613-2006 "the small and medium-sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency rating" revision,completed by China standardization institute and other units of the new GB18613-2012 "the small and medium-sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency rating" countries have released in May 2012,and on September 1,2012.After implementation,the standard of energy efficiency products will be banned from production,sales of imports."2013 special action plan for energy saving and green industrial development from the miit on IE2/IE3 electric motor March 26,issued by the 2013 industrial energy saving and green development action plan for special notice,in 2013 will focus on promoting the implementation of motor efficiency under special plans.: special action to implement goals so as to realize the national industrial power saving 1% (30 billion degrees),explore the development patterns and industrial energy saving and green,implementation to point with surface,drive the industrial energy saving and comprehensive utilization of the whole work progress.In 2013,according to plan,miit will from the promotion of efficient motor,eliminate inefficiencies and both the motor system energy saving technical reconstruction in six aspects,such as promotion,elimination and 100 million kw motor and motor system,the reform more efficient motor market,promote the motor product upgrading and industrial upgrading.

The cause of overheat the motor load

A motor overload operation,when the device does not form a complete set,the motor load power is greater than the rated power of the motor,the motor overload operation (i.e.,a small cart) for a long time,can lead to overheating.Repair motor overheating,should three phase induction motor first find magnet prices out whether the load power and motor power,with the removal of blindness without a purpose.B,drag the mechanical load of work is not wholesalemotor.blogspot.com normal,although equipment form a complete set,but the mechanical load that drag don't work properly,the runtime loads when small,motor overload and fever.C,drag the mechanical failure,when being dragged malfunction with rotor and stator the machine,the rotation is not flexible or stuck,will make the motor overload,causing the motor winding overheating.The motor overheating,overhaul,load factors cannot be ignored.

To deal with the difficulties to promote efficient motor to obtain

To deal with the difficulties to promote efficient motor to obtain from the following several

aspects:1,the development of efficient motor system application software,for the use of efficient

equipment department provides energy-saving benefit evaluation service,guide the rational choose efficient equipment department energy-saving products and energy-saving renovation,can draw lessons from foreign successful experience.It is understood that the international motor selection and

energy-saving analysis software (EECO - MOST has been completed by the international copper

association (China) localization,is now in the stage of further perfecting China's motor data.2,carry out publicity and education activities,and communication.Organize seminars and training courses,in order to improve the whole society's awareness of motor system energy saving.Swap international motor system energy saving,complement each other,ocean is convenient,permanent magnet motors for salefor our country's motor system energy saving services.

Through publicity and education to make people recognize in the whole life cycle of the motor,the acmotortrading.blogspot.com purchasing price only accounted for 2% of the total cost of the motor maintenance costs accounted for 0.7% of its total cost,while energy consumption cost accounts for 97.3%.Using efficient motor can not only improve productivity and reduce motor life cycle cost,also can reduce energy consumption and reduce carbon emissions.3,to set up the China motor challenge program website,development related propaganda way.Challenges planning ideas include: the framework of Chinese motor industry research,the research and implementation of incentive policies,formulate and implement energy efficiency standards,the establishment of the identification of energy efficiency and energy conservation product authentication system,case study and the application of the establishment of demonstration projects,energy-saving mechanism and carry out research and development work of high efficiency and highly efficient motor.ac electric motor parts4,perfect the system of the national policy,increasing the national support of the

efficient motor and mandatory indicators,encouragement and punishment.Above all,efficient motor

single phase capacitor start induction motor of promotion opportunities and challenges.As motor staff we should strengthen the study and understanding of efficient motor promotion of national and social environmental protection energy conservation and emissions reduction.Publicity and promote efficient motor.Contribute to the healthy development of social economy.

Promotion of efficient motor outlook

Abstract:the motor is widely used in our daily life,it throughout all corners of the from all walks of life,in the process of production,living plays a very important function.Promote efficient motor can save energy,reduce pollution and broad prospects,but also promote efficient motor is faced with difficulties.Key words:marketing;High efficiency motor;Prospects;difficult Devices of all kinds of motor as a driving force,is widely used in industry,commerce,defense,utilities and other fields.The motor power consumption average accounts for more than 50% of the total power consumption of the world,accounting for more than 70% of the industrial electricity consumption.Research shows that through the implementation of the motor efficiency standards and promote the application of high efficiency motor,by 2011,accumulative total of 76.4 billion kW.h,save electricity,49.7 billion yuan,CO2 emission reduction 7 6.4 million t (emission factor:1 kgCO2 / kW.h);By 2020,accumulative total of 1 65.3 billion kW.h,save electricity 7,80 billion yuan,CO2 emissions of 160 million t.China's the eleventh five-year plan clearly,energy consumption per unit GDP in 2010 than in 2005 dropped 20%,among them as a key project of one of the ten major energy conservation motor industry's goal is the average energy consumption by 20% ~ 30%.

Therefore,the improvement of motor efficiency is of great significance for China's current energy conservation and emissions reduction work.In this paper,the brief analysis of the promotion prospects of high efficient motor:A,the advantages of high efficiency motor determines its good promotion prospects:GB 18613-18613 "small and medium sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency level" defined:reach level 3 indicators of energy efficiency for the common motor;To achieve the secondary indicators of energy efficiency (equivalent to the eu effl standard),as an energy-saving motor,namely high efficiency motor;To reach the level of energy efficiency indicators for ultra high efficiency motor.High efficiency and energy saving motor using new motor design,acmotortrading.blogspot.com new technology and new materials,by reducing the wastage of the electromagnetic energy,heat energy and mechanical energy,improve the output efficiency.Compared with the standard motor,motor using efficient energy-saving effect asynchronous motor is very obvious,normally efficiency can be increased by 4% on average.Efficient energy-saving motor mainly with ac frequency conversion motor,YX single phase asynchronous motor efficient,Y3 low-voltage high-power,wind turbines,rare earth permanent magnet motor,high voltage Y2 compact and YB2 flameproof motor,etc.

High efficiency motor has the following advantages:1,high efficiency and low loss.We know that the motor efficiency expression is:efficiency = (input power loss)/input power was 100%.By visible on type,improve the efficiency of motor is the key to minimize wear and tear (including,core loss and winding loss wind friction loss and stray loss).Excitation characteristic of high efficiency motor with good of senior electromagnet,generator rotor and stator small metal loss and increase the dosage of iron core and copper loss is decreased obviously,improve the efficiency.YX series high efficiency motor in China than Y series motor with high efficiency by about 3%,basic Y series motor and J2,basic J02 compared series motor efficiency is 1% higher than the 1%.The energy saving effect of using efficient motor as shown.Promotion of efficient motor outlook Electrical specifications:fully enclosed external fan cooled,2,2 kw,4,200 v,50 hz rate:100% If run 1 year 5,000 hours,can power saving about 400 KWH.2,high reliability,long life and low noise.Due to reduced losses,reduce the motor running in the process of temperature,the cooling air volume reduction,effectively improve the reliability of insulation and bearing.High efficiency motor life expectancy is longer than the average life span for ordinary motor,and lower noise.3,keep the universality and interchangeability.Due to the installation size is the same as the standard motor,keep the universality and interchangeability.4,starting torque and high locked-rotor torque ratio,power rating.Due to the power level,to reduce user's installed capacity,can avoid or reduce the "big horse-drawn cart" unhealthy phenomenon.

Three-phase asynchronous motor open phase fault operation

1,the lack of the phenomenon of phase operation Three-phase asynchronous motor 220v ac electric motors open phase running "refers to a three phase power supply phase lack a phase or three phase winding of the motor circuit there is a phase in the motor caused by abnormal running state also called open phase running. Destroyed most of the three-phase asynchronous motor winding is caused by motor open phase running,when the motor is in a state of overload,under the same load power,lack of phase running current rotor and stator is higher than normal operation of the current times.At this point,if not handled in time,motor winding will be burned.If the motor before starting circuit,a phase may only after turning on the power single phase capacitor start induction motorsupply noise is not www.facebook.com/guohong.trading

starting,must cut off the power immediately,otherwise,will burn winding.

Ac servo motor control

The structure of the dc servo motor as the common dc motor,and is done in order to reduce the moment of inertia of long and thin.It's exciting winding and armature respectively by two independent power supply.There is also a permanent magnet,namely the pole is a permanent magnet.Usually adopt the armature control,that is,f certain excitation voltage,establish flux is also a constant value,and the control voltage in the armature Uc,institutional characteristics of the dc servo motor (n = f (T)) and dc separately excited motor,three-phase asynchronous motor under different control voltage (Uc control voltage rating) of mechanical characteristic curve.By the graph is: under certain load torque,when magnetic flux unchanged,if the rise in the armature voltage,the electric vehicle motor speed of the motor is higher; On the other hand,the lower the armature voltage,speed dropped; When Uc = 0,motor immediately halt.To motor reversal,can change the armature voltage polarity.Compared with dc servo motors and ac servo motor,it has mechanical properties is stiff,the output power is larger,rotation,large starting torque,etc The normal operation of the servo motor,as long as out of control voltage,the motor stop immediately.

When servo motor loss control voltage,it is in single phase operation state,due to the rotor resistance is big,the rotation of the two opposite directions in the stator rotating magnetic field and rotor effect produced by the two torque characteristics (T1,T2 S1 S2 curve) and synthetic torque characteristics (t-s curve,with the ordinary single-phase asynchronous motor torque characteristics (T '-s curve).Then the synthesis of torque T is the brake torque,so as to make the motor stop quickly.Servo motor is single-phase runtime mechanical characteristic curve.A certain load,the control voltage Uc,the higher the speed is higher,in the control voltage,load,speed down.The structure of the ac servo motor stator is basically similar to capacitance split-phase single-phase asynchronous motor.On the stator winding with two position difference of 90 ° to each other,one is Rf excitation winding,it always pick on the ac voltage Uf; L,another is the control winding connection control signal voltage Uc.So is also called the two ac servo motor servo motor.wholesalemotor.blogspot.com Hollow cup rotor servo motor structure without control voltage ac servo motor,the stator is only produced by the pulse excitation winding magnetic field,rotor motionless.When a control voltage,stator and then produce a rotating magnetic field,the rotor rotate along the direction of the rotating magnetic field,in the case of constant load,the speed of the motor changes with the size of the control voltage,when the control voltage of opposite phase,servo motor will be reversed.

The output power of the ac servo motor is 0.1 100 w.When the power supply frequency 50 hz,voltage is 36 v,110 v,220,110 v; When the power supply frequency is 400 hz,the voltage have 20 v,26 v,36 v,115 v,etc.Ac servo motor smooth operation,low noise.But control characteristic is nonlinear,and the rotor resistance is big,loss is big,efficiency is low,so compared with capacity of Y series motor,big volume,heavy weight,so is only applicable to 0.5 100 w small power control system.The working principle of ac motor fan servo motor with split-phase single- phase asynchronous motor,though similar,but the rotor resistance of the former is much larger than the latter,so compared with the single asynchronous motor,servo motor has three significant characteristics,due to the rotor resistance is big,the torque characteristic curve 1,with normal asynchronous motor torque characteristic curve,compared to 2 a significant difference between the two.It can make the critical slip S0 > 1,this not only makes the torque characteristic closer to linear mechanical properties,and has a large starting torque.Therefore,when the stator's a control voltage,rotor rotating immediately,which has the characteristics of starting fast,high sensitivity.The rate in the range of 0 to 1 S servo motor can stable operation.

High voltage motor stator coil damage problem Electrical engineers

General electrical engineer pointed out that the long-term operating experience and motor stator winding accident phenomenon indicates that the generator and high voltage motor stator coil corrosion damage phenomenon is quite common,seriously affect the safe operation and service life of the motor.A,corrosion characteristics and parts of motor stator coil From the high voltage motor stator winding coil main insulation breakdown phenomenon,the main coil corrosion damage of the insulation can be roughly divided into two classes: class starts to coil outside the main insulation inner corrosion damage,often referred to as corrosion;Another kind began to coil internal insulation outside corrosion,commonly referred to as internal corrosion.1.1 main coil insulation outside corrosion damage (1) motor stator winding end inside the stator core and coil vibration,the primary coil insulation corrosion damage.This is the most common corrosion damage accident is also one of the most serious phenomenon.Cause this is the main reason of the corrosion damage,the motor in operation,because of its department of winding vibration under the action of electromagnetic force,the coil in the stator core groove end fixed not firm,article slot wedge,the line between layers of cushion,loose end interval block and tied the rope off,coil and lashing and friction within the interval between block,anticorona lacquer semiconductor corona corrosion damage,resulting in slot and end coil main insulation breakdown.

(2) the stator core wear corrosion of the internal magnetic materials.This kind of situation is mainly due to the maintenance process without careful cleaning and purging of the stator winding,causing the windings cracks and other corner place left some tiny magnetic sundry,when the motor running magnetic debris was adsorbed on the surface coil insulation Lord,under the action of electromagnetic induction and electromagnetic force,magnetic impurities in rotation movement,grinding main coil insulation to drill a hole.(3) of the stator coil corrosion of oil.At present,a large generator and high voltage motor bearing shell are widespread leak phenomenon,thus the motor coil for burning oil corrosion accidents are quite common.Parts of the basic focus of this kind of failure at the end of motor stator slot,winding and winding nose leads.Are attached to the coil is characterized by the oil,to dissolve erosion effect to the main coil insulation,main insulation and conductor is layered whole coil insulation strength is reduced,after long time running and stator winding short circuit,grounding short circuit fault,etc.(4) the stator core silicon steel sheet of corrosion wear of the insulation.If in the process of being connected in the stator iron core,silicon steel sheet laminated,irregular or stator core ventilation channel and the end pressure refers to fixed installation,or damage to the stator core in the repair,will cause the vibration occurs when the motor running,wear insulating,eventually resulted in the breakdown of the main insulation of wire coil.

1.2 coil corrosion Multiple accident statistics and fault coil autopsy results show that the coil internal corrosion is more serious.Corrosion inside the large coil anatomic analysis showed that the corrosion is generally from insulation and conductors in the air gap between the air bubbles,coil straight line and the end of the R Angle,coil lead off line welding etc.Corrosion phenomena within the first coil internal insulation to bleach and gradually expand,then burning insulation form hole and a large number of green powder,so as to accelerate and main corrosion damage of the insulation between wire strands,until the main insulation breakdown.In addition,the high temperature caused by the thermal aging is also an important factor to the internal corrosion.Second,the coil reason analysis of internal and external corrosion Motor stator coil of the internal and external corrosion reasons,mainly due to the main coil insulation in the motor running,long-term in electromagnetic vibration,high temperature and high voltage under the action of three kinds of factors and vibration wear,corona corrosion and thermal insulation aging,make whole coil insulation shell,layered,burning,wear and dielectric strength reduce wait for a phenomenon,resulting in insulation breakdown of failure.

Electromagnetic vibration wear corrosion (see electrical engineer) In the operation of the motor in produce all kinds of mechanical vibration,wear out coil insulation,corrosion is one of the main electromagnetic vibration on the motor end winding and the influence of notches.If the stator core installation quality is bad,bad winding end binding process,make the coil in the groove by fixed bad,produce great vibration amplitude,article water pump interlayer pad and temperature measuring element pads in the lower level to HuiCuan move between coil and wear on the lower layer coil,the coil main insulation damage.Is more serious is that,if in the operation of the coil wire through the current 2 times frequency electromagnetic vibration,will not only make the coil and iron core and winding end interval block vibration,make the main insulation surface wear,but also can make the wire with the main insulation between the friction between interturn,shares of the wire vibration,causing wire interturn,loose,short circuit,break between the shares.At the same time,the additional loss and the temperature rise in short circuit,will accelerate local main insulation ageing,reduce the dielectric strength,even under normal working voltage insulation breakdown caused by failure.Therefore,the electromagnetic vibration is caused by coil outside the main insulation 8500w gasoline generator corrosion and the main cause of the corrosion damage.

The cause of the motor open phase have?

Power supply:(1) the switch contact undesirable;(2) transformer or line break;(3) the safety

fuse.Motor:(1) motor terminal box screw loose poor contact;(2) the internal wiring bad welding;(3)

the motor winding wire break.What are the induction motor sales causes of abnormal vibration and sound? Mechanical aspects:(1) poor lubrication bearing,bearing wear;(2) bearing chamber www.dongfeng-motor.com is too large.(3) fastening screw loose;(4) motor with sundry.Electromagnetic aspects:(1) the motor overload operation;(2) three phase current balance;(3) lack of phase,(4) of the stator,rotor winding short- circuit fault;(5) caused by the welding part of the open welding of cage rotor broken bar.What are the cause of the motor bearing overheating?

The motor itself:(1) the bearing inner and outer ring with tight;(2) parts shape tolerance has a problem,such as frame,end cover,shaft parts alignment is bad; (3) bearing improper selection;(4) bearing or bearing cleaning not net,poor lubrication grease with sundry;(5) the shaft current.Use: pumps (1) improper installation,such as the motor shaft and the drive device of the shaft alignment of undesirable;(2) pulley pulled too tight; (3) bearing bad maintenance,insufficient or grease,could more than dry deterioration.The motor insulation resistance low what are the reasons?(1) winding be affected with damp be affected with damp or water invasion;(2) winding on accumulation of dust or oil;(3) insulation aging;(4) motor wire or wiring board insulation damage.

what is the step motor?

Stepper motor is a kind of electrical pulses into angular displacement of the actuator.When stepping drive receives a pulse signal,it drives stepper motor according to set the direction of a fixed Angle (i.e.,step Angle).You can by controlling the pulse number to control the amount of angular displacement,so as to achieve the purpose of accurate positioning;At the same time you can control the pulse frequency to control motor acmotortrading.blogspot.com rotation speed and acceleration,so as to achieve the purpose of regulating.2,the classification of the stepper motor,stepper motor in three kinds: permanent magnet (PM),reactive (VR) and hybrid (HB) : general for two phase permanent magnet stepping,torque and volume is small,the stepping Angle of 7.5 degrees or 15 degrees;Reactive step for three-phase commonly,can achieve high torque output,stepper Angle of 1.5 degrees commonly,but the noise and vibration are very big.

Hybrid stepping refers to a mixture of permanent magnet and the advantages of reactive.Five phase and it is divided into two phase,three- phase,two-phase stepper Angle generally 1.8 degrees,the application of the stepper motor single phase induction motor is more extensive.3,how to determine the stepper motor driver dc power supply: a.determine the voltage of hybrid stepping motor drive power supply voltage is usually A wide range,such as 2 m530 power supply voltage is 24~45 VDC),the power supply voltage is usually according to the requirements of the machine work speed and response to choose.If the motor rotation speed higher demand or response quickly,so the voltage value is high,but pay attention to the power supply voltage ripple cannot exceed the maximum input voltage of the drive,otherwise may damage the drives.

B.determination of current power supply current generally determined according to drive the output phase current of the I.If the linear power supply,power 1.1~1.3 times of the current generally desirable I;If the switch power pumps supply,power supply current generally desirable I 1.5~2.0 times. 4,stepper motor and ac servo motor performance comparison: stepping motor is a kind of discrete movement of the device,it has the nature of the contact and the modern digital control technology.In the current domestic digital control system,stepping motor is widely used.With the emergence of digital ac servo system,ac servo motors are increasingly used in the digital control system.In order to adapt to the development trend of digital control,motion control systems mostly adopt stepper motor or all-digital ac servo motor as the executive motor.Although both similar on control mode (signal pulse sequence and direction),but in the use of performance and applications where there is a big difference.The use of both performance comparison.

Motor fault..

1 Phenomenon: starting controller cannot be started.Methods: 1,grounding detection,normal. 2,control cabinet,soft start fault,starting current is not normal.3,replace the soft wholesalemotor.blogspot.com starter.4,phenomena,and 2.5,measuring and motor resistance,resistance to 0.Lazy day,I turned out to be workers,only measuring grounding resistance,no resistance value between test items,we water pump motor checked for a long time,thought it was a soft starter is broken,the www.facebook.com/guohong.trading terminal box at the original are all connected to the motor power cable to cut off,oh my god,can single phase induction motor my bitter pit,sorching summer I stayed for two days on site in sewage mosquitoes can calculate to see blue.Other: if the motor is good for fire insurance,it must be soft starter is broken.

how to correctly choose servo motor and stepper motor?

ainly depending on the specific application,simply to determine:the nature of the load (such as

horizontal or vertical load,etc.),Torque,moment of inertia,rotational speed,precision,deceleration

requirements,such as upper control requirements (such as requirement for port interface www.dongfeng-motor.com and communication),main control mode is position,torque,or speed Way.Power supply is dc or ac power,or battery power,voltage range.Accordingly to determine motor and drives or the model of the controller.2,select the step motor or servo motor system? Actually,should choose what kind of motor pumps according to the specific application,each have its characteristics.? 3,how to stepper motor driver? According to the current of motor,with greater than or equal to the current drive.If you need or high precision,low vibration with segment type Drive.For large torque motor,high voltage type drive as far as possible,in order to obtain good performance at a high speed.rotor balancing machineAccording to the current of motor,with greater than or equal to the current driver Device.If you need or high precision,low vibration can be blending subdivision

drive.For large torque motor,high voltage type drive as far as possible,in order to obtain good

performance at a high speed.

The biggest difference between step motor and general motors

Stepper motor is different from common motor's biggest stepper motor can well control the motor

rotation Angle;Stepper motor is a kind of electrical pulses into angular displacement of the

actuator.Popular point:when the stepper driver receives a pulse signal,it is driving a stepper motor

according to set the direction of a fixed Angle (and the step Angle).You can by controlling the pulse

number to control the amount of angular displacement,so as to achieve the purpose of accurate

positioning;At the same time you can control the pulse frequency to control motor rotation speed and

acceleration,so as to achieve the purpose of speed control.2.What kinds of stepper motor points?

Stepper motor in three kinds:permanent magnet (PM),reactive (VR) and hybrid (HB) permanent magnet stepping,generally for two phase,torque and volume is small,step Angle is 7.5 or 15 degrees

commonly;Reactive step for three-phase commonly,can achieve high torque output,stepper Angle of 1.5 degrees commonly,but noise and vibration are very big.In Europe and the United States and other developed countries have been eliminated in the 80 s;Hybrid stepping refers to a mixture of permanent magnet and the advantages of reactive.It is divided into two and five phase:two phase stepper Angle of 1.8 degrees commonly and five phase stepping Angle of 0.72 degrees.The application of the single phase induction motor stepper motor is more widely.

3.What is HOLDING TORQUE (HOLDING TORQUE)? HOLDING TORQUE (HOLDING

TORQUE) refers to the stepper motor power but no turns,locked rotor TORQUE of the stator.It is one of

the most important parameters of step motor,stepping motor at low speed torque close holding

torque.Because of the stepping electric machine along with the increase of speed and continuous

attenuation,the output torque output power also along with the increase of speed change,so keep the

torque has become a measure of stepping motor is one of the most important parameters.,for

example,when people say 2 n.220v ac electric motorsm of stepper motor,in the absence of special specification refers to the holding torque is 2 n.M stepping motor.4.What is the DETENT TORQUE? DETENT TORQUE is refers to the stepper motor under the condition of no electricity,locked rotor TORQUE of the stator.DETENT TORQUE at home there is no uniform way of translation,to make you misunderstanding;As a result of the reactive stepping motor rotor is not a permanent magnetic material,so it does not DETENT TORQUE.5.How much precision stepper motor for? Cumulative? General precision of the stepper motor step Angle of 3- 5%,and do not accumulate.6.The appearance of stepper motor temperature allowed? Stepper motor temperature will make the first motor demagnetization of magnetic materials,which can lead to torque decline and even out of step,so the motor appearance allows the highest electricalmotor1.blogspot.com temperature

should depend on different points of demagnetization magnetic material;Demagnetization of magnetic materials,in general,some are above 130 degrees Celsius,some even as high as 200 degrees Celsius above,so the stepper motor appearance in 80-90 degrees Celsius temperature completely normal.