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Variable frequency starting is a method of soft starting for both variable frequency motors and line frequency motors.

In the previous discussion, we explored the rules of variable frequency starting, which involves starting at a low frequency and achieving smooth motor starting by adjusting the power supply voltage and frequency.

Some netizens have also made attempts to start the motor by supplying power through a frequency converter, but they encountered the fact that the motor cannot start due to tripping when starting directly at the rated voltage and frequency.

From the principle of variable frequency starting, the process of variable frequency starting involves both the voltage and frequency of the power supply changing.

The starting process is regulated in a constant torque manner to ensure that the motor has a large torque during the starting process, while the motor current does not exceed the rated current by too much. This ensures that the motor windings do not overheat.

In other words, during the variable frequency starting process of the motor, the motor current is protected by current limiting through the frequency converter.

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