Increased safety explosion-proof motor

 ac three phase asynchronous electric motor stator 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 
Overview add Ann type motor is a kind of explosion-proof performance is lower than the flameproof and higher than that of ordinary industrial enclosed type explosion-proof motor. The basic principle of explosion-proof is under acmotor2.blogspot.com normal operation conditions won't produce arc, spark or may ignite an explosive mixture of high temperature on the motor structure of take security measures to improve the safety degree, in order to avoid in the normal and recognition of appear the phenomenon of the motor overload conditions. The category of motor with explosion-proof performance. Measures are: the electrical equipment installed in a shell, motor parts the enclosure is can withstand the internal pressure, the explosion of explosive mixture and can prevent the spread of the explosion of the internal to the electric motor 12v 500w enclosure surrounding explosive mixture structure (flameproof); 


DONGFENG Brand Two Speed Motor

Specifications
1. DONGFENG Brand Two Speed Motor 
2. 3000RPM-750RPM 
3. Electrical motor 
4. factory price best quality 

5. 100% copper 
Make motor electrically charged components cannot produce enough to cause explosion danger of spark and arc or dangerous temperature, or electrically charged components on these phenomena may be produced with the explosive mixture partition, make it can't touch each other or not with explosive danger degree (increased safety, ventilation, etc.). In all kinds of explosive dangerous environment, correctly selecting and all kinds of equipment form a complete set of explosion-proof motor is very important. Is a kind of explosion-proof electric motor can 3 phase induction motor be used in inflammable and explosive factory of a motor, the runtime does not produce sparks. Explosion-proof motor is mainly used in coal mine, petroleum, petrochemical and chemical industry. In addition, in the textile, metallurgy, city gas, transportation, grain and oil processing, paper making, medicine and other departments have also been widely used. As a major power equipment, explosion-proof electric motor is often used to drive pumps, fans, compressors and other mechanical transmission.

Multimeter application tips measuring three

 Stator Motors Rotor
Specifications
1. 20 years manufacturing experience
2. competitive price,high quality

Measuring the zener diode: we usually used regulator tube voltage value is generally greater than 1.5 V,and pointer table R x 1 k resistance is to use in the table below 1.5 V batteries,so,measured with resistance R x 1 k under voltage regulator tube like measuring diode,with full of unidirectional conductivity.But the R x 10 k file pointer motor magnet table is made of 15 v or 9 v batteries,with R x 10 k test voltage value is less than 9 v and 15 v voltage regulator tube,reverse resistance would not be up,but has a certain value,but the value is significantly higher than that of positive resistance regulator tube.So,we can preliminarily estimate the stand motor run capacitor or fall of voltage regulator tube.But,good regulator tube have a precise voltage value,amateur conditions how to assess the voltage value?


Y series totally enclosed protect Asynchronous motor
Specifications
1. 20 years manufacturing experience
2. 12 months guarantee
3. low noise and temperature rise

4. high starting torque

 Is not difficult,to find a pointer table is ok.Method is: put a watch at first R x 10 k file,the black,red pens and respectively in the cathode and anode voltage regulator tube,then simulate the electrical motor real working state of the voltage regulator tube,then take another watch on voltage profile V x 10 V or V x 50 V (according to the regulated value),will be red,black pens and respectively by receiving the watch just now black,red pens and,at this time to measure the voltage value is basically the voltage value of the voltage regulator tube.Said "basically",because the first block of the voltage regulator tube bias current relatively normal when using the electricalmotor1.blogspot.com offset current is a bit smaller,so the measured voltage value is slightly larger,but the basic.This method can only estimate voltage value is less than the pointer table high voltage battery voltage regulator tube.If the voltage value of the voltage regulator tube is too high,can only use plus method to measure the power of the (so,when we choose a pointer table,choose high voltage battery voltage is 15 v more applicable than 9 v).

Capacitor start motor

 In capacitor start motor,start capacitance and start winding string together,thus forming a LC circuit,the circuit has good phase shift (and thus have a very good starting torque).The resistance for the motor will also increase the cost.Fixed phase capacitor motor Another motor is fixed phase capacitor (PSC) motor (i.e.,capacitor motor) up and running.This kind of motor operation mode is similar to the capacitor start motor described above,but it does not have the centrifugal switch,so its secondary winding is connected to the grid.PSC motor is usually used in hair dryer,electric fans,blowers,and other need to change.Under the condition of invariable load by changing www.dongfeng-motor.com the running winding signal to achieve the purpose of make the motor run at different speeds.All six winding connection respectively,a three-phase motor can connect two winding together through the rest of the a winding capacitance connected to start winding to run into one capacitor start motor.The repulsion motor Repulsion motor is single-phase ac motor rotor winding,it is similar to ac/dc motor.In the repulsion motor armature with brush nipple rather than and in series with the magnetic field.

Already have a few kinds of repulsion motor into production use,but most of all,with repulsion start sensing (RS)-IR motor operation.RS-IR motor with a centrifugal switch all the short commutator connect together,so when it is up to full speed it will run in the form of induction induction motor sales motor.RS-IR was used in the motor under low temperature and low voltage per ampere provide large starting torque.In 2005,almost did not sell any type of repulsion motors.Single-phase ac synchronous motor Small single-phase motor can also be designed to be magnetized rotor.This does not require any motor in the rotor induction motor,so they will not be lower than the main frequency.Instead,they will be as the rotation frequency synchronization.Because of their high speed precision,this kind of motor is typically used in electric power mechanical clock,record machine and tape recorder; They are also used in such as ribbon machine and telescope driving mechanism requires precise time of equipment.Shaded pole type synchronous motor is one of them.Because of inertia,so it is difficult to the rotor from state stopped immediately accelerated to synchronous speed.This kind of motor usually need some special way to start.A variety generator rotor and stator of different Design with a small induction motor (it will share the same and the synchronous motor excitation coil and rotor) or one-way speed (guarantee the rotor startup positive speed) as the very light of the rotor.

Three-phase asynchronous motor wiring diagram

Three-phase asynchronous motor wiring diagram:three-phase three-phase motor stator winding of each phase winding has two thread ends.A head is called the head end,on the other side called terminal.Provisions of the first phase winding head end with that D 1,end in 4 D;acmotor2.blogspot.com The second phase winding head end with D2,said end D5 said;The third phase winding end of the first represented respectively with D3 and D6.The six thrum import terminal connector,terminal marked accordingly D1~D6 tag,as shown in figure (1).Six of the three-phase stator winding end three-phase stator windings can be A star or triangle,y connection is to the end of the three-phase winding up magnet prices in parallel,the D4,D5,D6 three terminal with copper link together,and the three-phase winding head end access three-phase ac power supply respectively,the D1,D2,D3,respectively connected to A,B,C phase power source,as shown in figure 

(2).And triangle by law is the first end of the first phase winding to the 1 D connected to the end of the third phase winding D6,access to another phase power;Head end of the second phase winding connected to the end of the first phase winding D4 D2,and access to the second phase power;Head end of the third phase winding D3 connected to the end of the second rotor and stator phase winding D5,and access to the third phase power supply.Admiral in the patch panel terminal and D6 D1,D2 and D4,D3,and D5 connect with copper,then access to the three-phase power supply respectively,as shown in figure (3).An electric motive is pick a star or triangular,should depends on factory rules,available from the motor nameplate.Is the first of the three phase stator winding end manufacturers set beforehand,in no case can be generator parts stator arbitrary upside down,but the first end of the three-phase winding can be conversed together,such as the end of the three-phase winding D4,D5,D6 upside down as the head end,D1,D2 and D3 as an end,but never separate the ends of the head of a phase winding upside down,otherwise will produce wrong wiring.If wrong wiring junction box found raw,or winding end of the first mistake,light can't the normal starting motor,electric cause starting current is too large for a long time,motor heating is serious,affect the life,or burning motor winding,short circuit or power.

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.

The reason of smoking ac motor overheating

Ac motor overheating smoking causes are: (1) cage rotor broken bar or wound rotor winding wiring loose, the broken and loose, repair welding or fastening screws; (2) the power supply voltage is too high, if the supply voltage exceeds bid is bigger, is solved by power supply departments; (3), rotor core motorcycle rub, if the bearing clearance overrun, replace the new bearing. If the axis of bending and straightening process. If the core looseness, www.facebook.com/dongfeng.motor deformation, processing core; (4) the surface of the winding with grime, foreign body, cleaning or washing motor; (5) the motor start or amounts of positive and reverse frequently, reduce the motor start and the number of positive and reverse, or change the suitable motor; (6) motor overload or drag mechanical resistance motor part is too large, eliminate drag mechanical failure, reduce the resistance. If more than rated current, it is necessary to reduce the load. Replace the large capacity motor or adopt measures to increase; (7) the power supply voltage is too low, if the power cord pressure drop is too big, change the coarser the power cord. If the supply voltage is too low, is solved by power supply departments; (8) winding asynchronous motor turn-to-turn, interphase short circuit, winding grounding, check out; (9) inlet air temperature is exorbitant, check the cooling unit and the surrounding environment temperature; (10) motor open phase running, check the fuse, switch contact point, troubleshooting; (11) caused poor ventilation fan fault, check the fan, whether the blade deformation, damage or loose, replace when necessary; (12) after rewind, winding dipping, "secondary" leaching paint processing, or use vacuum varnished measures; (13) winding wiring error, change; (14) higher environmental temperature, or motor ventilation congestion,

Three-phase asynchronous motor starting method

Squirrel-cage three-phase asynchronous motor in the widely used now. This kind of motor in the design process focuses on at work can not only realize good use of intelligent control, and in the process of use and not due to the use of a lot of power to grid used in daily life, work, a certain power impact. The squirrel-cage three-phase asynchronous motor in use process, by the use of gf in use process is usually via step-down start to start the motor, now use the step-down start there are two main ways, one is step-down motion, while another is called soft start. Soft start is also called electronic soft start, the startup mode generally adopts 16-bit single chip microcomputer to be responsible for rotor and stator the control of the motor, through the intelligent control system, the motor at work can ensure that the motor in the load it can achieve a smooth start, still can reduce because click use too much power and cause certain impact to the grid. Including the squirrel-cage three-phase asynchronous motor in before and now, the grid has always maintained a in the process of running with the characteristics of volatility, often at the time of peak electricity consumption, electricity in use process found obvious battery is low, but in the case of electricity consumption is very low, there will be a power's use of power is very high. In order to some of the production process can fully more rational use of electricity, people invented the electric motor electronic soft starter, this product motor fan with this product, the squirrel-cage motor is applied. The squirrel-cage motor such as the electromagnetic brake is also need in step-down startup conditions. In the process of this kind of motor start, machine can't work under full pressure start mode, and when it starts, terminal voltage can't realize the characteristics of the specification requirements.