Variable Frequency Speed Regulation Method of Three-phase Asynchronous Motor

Variable frequency speed regulation method of three-phase asynchronous motor: Variable frequency speed regulation is a speed regulation method that changes the frequency of motor stator power supply, thereby changing its synchronous speed. The main equipment of the variable frequency speed regulation system is the frequency converter that provides variable frequency power supply. The frequency converter can be divided into AC DC AC frequency converter and AC AC frequency converter. At present, most of the domestic AC-DC-AC frequency converters are used. This method is applicable to the occasion with high precision and good speed regulation performance. Its characteristics:

1. The slip loss in the speed regulation process can be fed back to the power grid or production machinery with high efficiency.

2. The capacity of the device is proportional to the speed regulation range, saving investment, and is applicable to production machinery with the speed regulation range of 70% - 90% of the rated speed.

3. When the speed regulating device fails, it can be switched to full speed operation to avoid shutdown.

4. The power factor of thyristor cascade speed regulation is low, and the harmonic effect is large.