Using logical analysis to identify and narrowing the scope of the fault

Maintenance simple electrical control circuit,to each of the electrical components one by one to inspect each wire,usually can quickly find the point of failure.But for complex circuit,often have hundreds of components,thousands of wire,if to examine' method,not only need to spend a lot electrical motor of time,but also easy to leak check.If in this case,according to the circuit diagram,using logical analysis,make concrete analysis of the fault phenomena,to draw suspicious range,improve the maintenance of the targeted,can receive motor run capacitor the accurate and fast effect.

Analysis circuit first,from the perspective of the main circuit,realize the industrial machinery using a few moving parts and electric motor drive,what are related to each motor electrical components,what control adopted,electricalmotor1.blogspot.com and then according to the electric main circuit of the circuit element used text symbols,sex and control requirements,find the corresponding control control circuit.On this basis,combining with the failure phenomena and circuit principle of asynchronous motor work,careful analysis of the screen,can quickly determine the possibility of failure.When fault suspicious range larger,don't need to check step by step,step by step then can be in the range of failure in a check of the intermediate links,to judge the fault occurred where on earth is part of thus narrowing the scope of failure,improve the inspection speed.

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.

Make check general to consider the following aspects

Make check general to consider the following aspects:1) whether the motor torque is enough big,can

drive the load,so we usually recommend the user selection to choose moment when 50%~100% larger than the actual need of motor,step motor cannot load running, Even a moment,can create out of step,serious when a halt or irregular back again and again.2) host controller to input your step pulse current is big enough 10 general ma),so that the optical coupling and stable conduction,the frequency of the input is too high,lead to receive less than,if the host acmotortrading.blogspot.com controller Output circuit is CMOS circuit,also want to choose CMOS input type of drive.3) whether the start frequency is gasoline generator spare

partstoo high,is set up in the launcher to accelerate the process,the best from the

start of the motor regulation within the frequency began to accelerate to the set frequency,even if

the acceleration time is very short,otherwise may be unstable And even in the idle state.4) when the

motor is fixed,and sometimes this could be happening,belong to normal.Because,in fact,this caused the motor's strong resonance caused by the state of out of step.Motor must be fixed.5) for 5 phase motor phase wrong,the motor can't work.8,I want to control servo motor directly by way of

communication,can?Possible,also is more convenient,is only a matter of speed,for the application of

response speed requirement is too high.If fast response of the control parameters,had better use

servo motion control card,generally it with DSP And generator rotor and stator high speed logic circuit,in order to realize high speed and high precision motion control.Such as S acceleration,multi-axis interpolation,etc.

Summary of hybrid linear stepping motor technology

Basic step motor is composed of www.dongfeng-motor.com magnetic rotor iron core through the stator with pulsation produced by the stator interaction between electromagnetic field and produce rotation.Linear motor rotation movement into linear motion,to complete the transformation of precision depends on the step Angle of the rotor and the selected method.Linear stepper motor,or called linear stepper motor,first appeared in 1968 Patent no.3402308,was awarded to William Henschke.Since wholesalemotor.blogspot.com then,linear stepper motor is applied to include manufacturing,precision alignment and precision of flow measurement,high demand areas.Use thread precision of three-phase asynchronous motor,depending on the pitch.Install a nut in the center of the linear motor rotor,accordingly Use a screw nut with the mesh,in order to make the screw axial movement,must in some way to prevent the screw rotation with rotor components.Constrained due to the screw rotation,when the water pump motor rotor rotates,screw for linear motion.Both inside the motor with fixed screw shaft components and on the external thread shaft use can't rotate but axial freely Mobile nut,is a typical method of rotational restraint.To simplify the design,inside the motor to realize linear transformation is meaningful.The method greatly simplifies the design and make in many application fields in the motor lamination case of not to install the external mechanical linkage directly using the linear motor for precision linear movement.The initial linear motor has adopted A combination of a ball nut and screw.Ball screw to improve the efficiency of above 90%,and according to thread condition,the efficiency of the trapezoidal thread with only 20% to 20%.Although to convert rotary motion to linear motion ball screw is a kind of efficient method,but the ball nut to calibration requirement is very high,and large,expensive.As a result, In most applications,the ball screw is not a practical solution.