Testing method:
Visual inspection: check whether the appearance of synchronous machine is burnt, rust. If have,that
means the winding of motor is broken.In the case of non-power,hand knob output shaft,if there exist strange
noise,that may be caused by driving wheel not matching or loose for connecting piece.
2)：Resistance test
① short circuit: Measure resistance of each winding by universal meter, if the resistance value is
lower than the standard, the winding may short circuit.
② open circuit: Measure resistance of each winding by universal meter, if the resistance value is
infinite, the compressor winding may open circuit.
3)、Testing method:
check by multimeter, select the appropriate range. one pen contacts with input terminal,the other contacts
with body of step motor.if the resistance is ∞ or tens of thousands of ohms,means insulating property is
good.if the measured resistance of the smaller or 0,means core screen has been destroyed.
4)、Check on running
Testing method:
make sure synchronous machine running with load, there shouldn’t be unusual noise. if there is unusual
noise,it is caused by rust or wear. If it does not work, most is due to open coil, short circuit, or rust.
5)、Torque checking
Testing method:
make sure the motor running by rated power, use needle nose pliers or similar tool clamp output shaft of
the motor till making the motor stop.
Fault judgement:
At rated voltage, frequency, braking torque of synchronous machine should be ≥ 0.345Nm, if the output
shaft of the torque is less than 0.345Nm, can be found the torque is not enough, can not bring the
throttle to run.
6)、electrical performance checking
Testing method:
use needle nose pliers or similar tool clamp output shaft of the motor,rotate it clockwise.at the same
time, choose AC 20V voltage,then connect two pens with step motor input end.after rotating the output
shaft there should be clear voltage shows on multimeter.
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