Detection and removal of common faults in motor
There are two kinds of motor faults, mechanical and electrical. The mechanical faults are easy to find, and the electrical faults must be analyzed and judged by measuring their voltage or current. We now introduce the inspection and removal of common faults in motors.
I. the no-load current of the motor is large
The multimeter in DC 20A gear, the red and black pen are connected to a power source input controller. Turn on the power and record the maximum current value of the meter at the time the motor does not rotate. A1.
Turn the handle and turn the motor at high speed without load. It is more than 10s. After the speed of the motor is stable, begin to observe and record the maximum value of the meter at this time A2.
The no-load current of motor =A2-A1
The maximum no-load no-load current reference of various motors is as follows:
When the no-load current of the motor is greater than the limit data of the reference table, it shows that the motor is out of order. The reason why the no-load current of motor is large is:
The internal friction of motor is large.
Local short circuit of coil.
Demagnetization of magnetic steel.
We continue to do the relevant test and inspection items, we can further determine the cause of the failure or fault location.