Sometimes the motor doesn't work, it's not a big problem, it's just a small component that needs to be replaced! It is easy to replace and it will continue to work normally.
Like an electric fan at home, if it is found that the fan starts very slowly and can run normally after a period of time, it is not that the motor is broken. Only need to change a starting capacitor, add a little lubricating oil to the shaft and it can work normally.
For single-phase motors, you can use a multimeter to measure whether it is good or bad. Multimeters are also called multiplex meters, multimeters, triple meters, multimeters, etc., and are indispensable measuring instruments for power electronics departments, electronics enthusiasts, and maintenance personnel.
For single-phase motors, adjust the multimeter to the ohm and Ω range (electronically adjustable to the on-off range, and the pointer multimeter to 20k), touch the red and black test pens lightly, and the multimeter returns to zero.
One test lead of the multimeter is grounded, and the other test lead is used to measure the motor starting winding, running winding, and common winding. The resistance value should be infinite or close to infinity. If there is no resistance value or the resistance value is very small, it means that the motor is broken. Then measure the resistance of the three windings respectively, the starting winding is equal to the sum of the resistances of the running and common windings.
Measure the insulation performance of the motor, adjust the multimeter to the megohm range, the red test lead is in good contact with the motor terminal, and the black test lead is in contact with the metal part of the motor casing. Look at the multimeter reading. Generally, the motor is greater than 2 megohms, and there is no problem with the insulation.
Three-phase motor test is good or bad: first disconnect the three-phase winding connection piece, use a digital meter to measure whether the resistance of the three windings is the same, if the measurement fails, open the winding, and then use a megohmmeter to measure the phase-to-phase insulation of each winding, which should not be less than 0.5 Megohm, after the above test, it can basically be determined whether the motor is normal.
