How to buy a farm motor
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1. Check the appearance. The paint layer on the surface of the motor should be smooth and smooth. The nameplate should be installed properly and the signs should be complete. The cooling ribs of the enclosed motor should be intact and complete. 2. Manually rotate. Rotate the motor shaft by hand, the rotation should be very flexible, the inertia is better, and the axial direction is basically free of momentum. 3. Diagnosis of bearings. Power running 15-25 minutes, the bearing should be smooth and light, no stagnation phenomenon, uniform and harmonious sound; bearing temperature is not high, there is no oil leakage, oil rejection phenomenon; after the operation is stopped, touch the motor seat and the end cap does not feel heat. 4. Check the wiring. Open the junction box to see if the signs of the phase lines are clear and complete, whether the contact pieces are compacted and pressed, and whether the nuts are complete. 5. Measure resistance. With a manual megohmmeter with a rated voltage of 500 volts (V), measure the insulation resistance between the phase wire of the wire end and the phase wire and between the phase wire and the base. The insulation resistance of the normal motor should be greater than 1 megohm. 6. Measure the current. In operation, the current of each phase of the motor is measured with a clamp-type ammeter. The deviation of any three-phase current from the three-phase average value shall not exceed 10% of the average value. The no-load current is generally 25-50 of the rated current. %.