Wound rotor asynchronous motor rotor series resistance speed control method

Wound rotor asynchronous motor rotor string into the additional resistance,make the slip of the

motor,motor under low single phase asynchronous motor speed running.The series resistance,the greater the lower the speed of 5kw permanent magnet generator the electric motors price motor.This method is simple,easy to control,but the slip power consumption in acmotortrading.blogspot.com the form of heat on the resistance.Step speed,mechanical properties of soft.

Three-phase asynchronous motor winding is wrong

Winding wrong cause incomplete rotating magnetic field,mini electric motor the

start-up difficulties,imbalance of three phase current,the symptom such as large noise,serious

when,if not handled in time will burn winding.Basically has acmotor2.blogspot.com the following several ways:a very phase one or several coil embedded against or end wrong;(phase) set the;A phase windings to reverse;Multichannel parallel winding branch wrong;"Delta" and "Y" connection error.1,fault phenomenon:motor can't start,imbalance of no-load current is too large or too much,too fast or have severe vibration and temperature have a lot of noise,the phenomenon such as burn out the fuse.Causes:2,mistaking "delta" connect "Y";A three-phase winding maintenance on fore and aft by reverse;Relief boot is tap location choice not appropriate or internal wiring error;When offline,new motor winding connection error;The old motor s wrong judgment.

3.Maintenance methods:(1) the ball method.Such as the ball along the stator rotating circular surface rolling,that is correct,otherwise winding have wrong phenomenon.(2) the compass.If the winding is not wrong,is in a phase winding,the compass through adjacent pole (phase),referring to electric motors price the polarity should be on the contrary,in three-phase winding adjacent different phase (phase) group and the opposite;Such as polarity direction remains the same,suggesting a very (phase) reverse;If point to condemn,the group has the reverse coil.(3) the

multimeter voltage method.According to the wiring diagram,if the two measuring voltmeter are no instructions,or a reading,a no readings,winding has pick up the place.(4) common and dry cell,milliammeter remanence method,motor steering method,etc.

4.Methods:(1) a coil or coil set,ac electric motors the no-load current have larger imbalance,repair should be carried out to the factory.(2) lead to reconnect after wrong should correctly judge fore and aft.(3) relief wrong should be controlled wiring diagram or schematic diagram,carefully proofread rewiring.(4) new motor logoff or again after winding connection error,should be sent to factory repair.(5) of the stator windings connect the,pick up the one phase current is particularly big,according to the characteristics of the malfunction and repair.(6) take "Y" into "delta" type or number of turns is not enough,the no-load current is big,should be corrected in a timely manner.

Motor starting before the examination

New or stop using the motor for a long time, before the use should check between the winding and winding insulation resistance to ground. Usually below 500 v for the motor insulation resistance meter with 500 v; The 500-1000 with 1000 v v motor insulation resistance meter; diesel generators prices Of more than 1000 v motor insulation resistance meter with 2500 v. Insulation resistance shall not be less than 1 m Ω work every kv voltage, and measured motor part in the condition of motor cooling. (2) check whether there is any crack www.dongfeng-motor.com on motor appearance, all fastening screws and parts are complete, the thinking of fixed situation are in good condition. (3) check the motor drive mechanism work is reliable. As shown in (4) according to the nameplate data, such as voltage, power, frequency, coupling, rotating speed and power supply, if load is consistent. (5) monitor the ventilation of the motor and bearing lubrication situation is normal. (6) turn the motor shaft, check that the rotor can free rotation, the rotation has no noise. (7) to check the motor brush and brush lifting mechanism is flexible assembly, for the location of the brush handle is correct. (8) check reliable electrical grounding device.