How to detect electric motors, what are the commonly used detection methods? When detecting electric motors, it includes insulation detection, winding resistance value detection, no-load current detection, etc. In addition, it also involves relevant knowledge of single-phase motor resistance value and three-phase motor resistance value. Let's take a look below
1. Insulation detection
Use an insulation resistance meter (megger) to detect the motor casing and winding resistance values, and determine whether there is a leakage of short circuit to the casing.
. Detect the resistance value between winding resistances to determine if there is a short circuit between winding resistances2. Detection of winding resistance value
Generally, a multimeter can be used for preliminary testing to determine whether the winding resistance has short circuits, open circuit faults, etc
3. Detection of no-load current
Use a clamp meter to measure the no-load current of the motor. Generally, the no-load current is 40%~55% of the rated current. The main reasons for excessive no-load current are poor internal iron core of the motor, large gap between the rotor and stator, insufficient coil turns, and incorrect winding connection
4. Single-phase motor resistance value
Measure the resistance value of the common terminal, main, and secondary windings in pairs, where the sum of the two digits equals the third resistance value, which is normal, i.e. (R1=R2+R3). If any resistance value is infinite, it indicates an open circuit situation
5. The resistance value of the three-phase motor
Three leads should be measured in pairs, and their resistance values should be equal, that is, R1=R2=R3 is normal.
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