Can we test all the types of motors brushless, AC single phase, 3 phase, DC Motors, Servo motors etc with Megger ?thanks in advance
Only one type cannot.....the low voltage DC brushless motor like the cooling fan in computer. It has low voltage power converter module, Megger high voltage shall kill it. =======================================... Additional email reply to asker How to test motor with ohm-mter...... 3 phase motor -test all six leads between motor body, all show infinitive ohm. Use mega do the same test by setting it into 250v. Reading show 10M ohm or higher. Test resistance between two individual coils with mega, it should read 10M or higher. Use ohm-meter measure resistance of 3 coils, three reading show very close resistance. Compare the resistance from a good motor or from pass trouble shooting experience to determine it is a good motor. If one winding is much less resistance than other two or one winding is much higher than other two. This motor could be defective. If insulation test show under 1M ohm,its insulation is no more good,has electrical leaking. DC series motor: mega test between ground and leads, resistance test on both leads and compare the good motor reading. Rotate the rotor very slowly while doing resistance test,reading shall be change a bit (use analog type meter is better for this test). But resistance should not swing up and down very much. That tell how good is the brushes contact to rotor and what is the condition of several rotor coils. If at one position,resistance goes down into very small (zero) or jumps up very high. rotor needs clean or section of coil defective. Understand the construction of different type shall help you how to test it with simple ohm-meter.
