How to judge the quality of three-phase AC motor?
1, appearance inspection2, respectively measuring U1U2, V1V2, W1W2 resistance, three-phase resistance value should be equal, three-phase maximum difference should not exceed 2% of the average value3, if you use a multimeter, it's almost equal4. Monitor the current and motor temperature after idle running
Measuring U1, U2, W1W2, V1, V2 by means of an ohmmeter is conducted. If the barrier is not good, it is better to measure the resistance of the earth with a ohmmeter
How do you measure the Ohm's profile in a multimeter to determine the good or bad of the motor?. First, check for open circuit, U1 to U2, V1 to V2, W1 to W2 two, check insulation U1 to V1.W1, U1, V1, W1 to ground.
First of all, cut off the power supply, hand disk motor rotation, whether there are bearings stuck, rotor sweeping, and other mechanical faults.Remove the motor power line (U1, V1, W1, U2, V2, W2, U1, U2 respectively) measured with a multimeter, V1, V2, W1, W2 resistance, resistance is similar to the normal phase, if the difference is too large winding interturn short circuit, three-phase three-phase (also check the resistance between each other between the infinite resistance is normal) and ground (for housing) resistance.
