Factor analysis of frequency converter burning motor 1. Apply general motor as frequency conversion motor

Because the general motor fan is connected with the transmission shaft, when the frequency converter is used to change the speed, the speed ratio is unstable, which cannot reach the rated speed ratio of the motor, and the fan can not give full play to all normal functions, resulting in poor heat removal of the motor; In addition, the general motor is not designed according to the provisions of DC frequency conversion, which makes the motor hot or burned.

2. Variable frequency motor and frequency converter are immediately connected together for application without any adjustment

The two most common methods for the inverter to operate the motor are closed-loop control and v/f curve manipulation. Each manipulation method must first include the type of motor (synchronous, multi-threaded, with or without servo motor), the maximum power of the motor, the rated voltage, the rated voltage, the speed ratio or a few, the rated frequency, the maximum operating frequency, the acceleration and deceleration time of the motor start and termination, the protection measures of the inverter operated motor and its maintenance proportion coefficient Carrier communication frequency and other settings are indispensable.

After setting the main parameters, choose whether to use closed-loop control or v/f control. When selecting closed-loop control, the motor should match the dynamic self-learning training with the frequency converter under full load or the static data self-learning training with load. Only after the self-learning training, the motor and the frequency converter can give full play to the accuracy of closed-loop control; When selecting v/f operation, there is no need for self-learning and training, and the power supply will be connected immediately after the main parameters are adjusted.

3. The operation direction of the variable-frequency motor centrifugal fan is blindly inconsistent with the rotation direction marked in the fan, and the centrifugal fan cannot be brought into full play, resulting in the reduction of the heat emission of the motor, and the heat generated by the motor cannot be released, resulting in the motor burning or burning.

4. The number of items 2 and 3 in the above three conditions is more

For the above situation, it is suggested that when customers choose frequency converters to operate motors, they should choose frequency conversion motors. Frequency converters should choose manufacturers with high cost performance. Although the initial project investment is a little higher, the quality is guaranteed, there is no problem, and the operation time is long, which is not easy to cause downtime caused by common faults in motor or frequency converter maintenance. In addition, the after-sales maintenance service of frequency converters with high cost performance is guaranteed and the response speed is fast.