The method of adjusting motor speed
First, the speed regulation method variable pole
This speed regulation method is to change the number of stator poles of cage motor to achieve the purpose of speed regulation by changing the red receiving mode of stator windings. This method is suitable for production machinery without stepless speed regulation, such as metal cutting machine tool, lift, lifting equipment, fan, water pump and so on.
The characteristics are as follows.
1, It has hard mechanical properties and good stability.
2, No slip loss, high efficiency.
3, Simple wiring, convenient control, low price.
4, With stage speed regulation and large stage difference, it can not get smooth speed regulation. 5, It can be used in conjunction with pressure regulating speed regulation and electromagnetic slip clutch to obtain high efficiency smooth speed regulation characteristics.
Second, variable frequency speed regulation method
Variable frequency speed regulation is a speed regulation method to change the frequency of motor stator power supply and thus change its synchronous speed. The main equipment of frequency conversion speed regulation system is frequency converter which provides frequency conversion power supply. Frequency converter can be divided into AC-DC-AC frequency converter and AC-AC frequency converter. At present, AC-DC-AC converter is mostly used in China. This method is suitable for the occasions of high precision and good speed regulation performance.
Its characteristics are as follows.
1, High efficiency, no additional loss in the process of speed regulation.
2, With wide application range, it can be used in cage asynchronous motor.
3, Wide speed regulation range, hard characteristics, high precision.
4, Complex technology, high cost, difficult maintenance and maintenance.