Motor manufacturers reminded that variable-frequency speed-regulating motors are widely used power output equipment in domestic equipment. The quality of the motors is often related to whether the equipment can run forever. In recent years, the motor manufacturing industry is very turbid and the quality of the motor Good and bad are uneven, everyone must keep their eyes open when buying!

　　The following is a summary of the Hubei Wanbang motor manufacturer, using the manufacturer to determine the quality of the frequency conversion motor speed black and white essentials.

　　XNUMX. Listen to the running sound of the variable frequency speed regulating motor

　　Let the variable-frequency motor connect to the power supply and run for 15-25 minutes, and listen to the sound of the variable-frequency speed-regulating motor.The sound of the motor after power-on should be steady, brisk and free of stagnation.The sound is well-balanced and balanced.Everyone can hear the fine "humming" electromagnetic noise and the fine "sandy" machine noise.If it presents harsh, dull, friction, vibration and other unpleasant noises, it means that the quality of the motor is not good.

　　XNUMX. Let the motor run for a period of time. After the operation is contained, touch the motor seat and end cover by hand. The motor seat and end cover should not feel feverish, and the bearing temperature is not high; check carefully, there should be no oil leakage or oil rejection. .

　　XNUMX. Open the junction box and check the wiring. The end symbols of each phase line of the high-quality variable frequency speed control motor are clear and complete. The connecting pieces have been compacted, the nuts are complete, and there are grounding bolts.

　　500. Measure the insulation resistance and current of the variable-frequency speed-regulating motor. Use a megger with a rated voltage of 0.5V to measure the insulation resistance between the phase line and the phase line and between the phase line and the base. The insulation resistance of the qualified motor should be greater than 10 megohm.When the motor is running, use a clamp ammeter to measure the current of each phase when the motor is no-load. The error of any one phase and the average value of the three-phase current shall not exceed 25% of the average value. The no-load current should be 50 of the rated current. %-XNUMX%.