The influence of the inverter on the motor winding mainly has the following aspects：

1. The temperature rise of the winding coil increases: due to the high-order harmonics of the inverter output, the loss of the winding coil increases, resulting in an increase in temperature rise.Especially at low speeds, this problem is even more serious.

2. Accelerated insulation aging: When the motor winding is connected to the inverter, the resistance and reactance of the winding will change because the voltage and frequency output of the inverter can be adjusted.This change will affect the performance of the motor, especially during the speed regulation process, which may cause speed fluctuations.This may lead to accelerated insulation aging, so higher-grade insulation materials and winding wires need to be selected.

3. Vibration and noise: When the inverter is powered, a large excitation force may be generated during the operation of the motor, resulting in increased vibration and noise.

4. Imbalance of current and voltage: If the inverter does not adjust the current and voltage correctly, it may cause imbalance of current and voltage, which may cause damage to the winding of the motor.

5. Damage to the insulation between turns: The inverter outputs a high-order harmonic voltage. This voltage acts on the winding, which will produce a large electromotive force, which may cause damage to the insulation between turns.In addition, due to fluctuations in the voltage between the turns, it may cause eddy current effects, which will cause greater damage to the insulation between the turns.

Therefore, when using frequency converters, the correct motor windings and frequency converters should be selected, and their performance and specifications should be fully considered to avoid problems. The operation should be carried out in strict accordance with the operating specifications, and the motor windings should be regularly inspected and maintained to ensure the normal operation and service life of the motor.