What are the speed control methods for Trimmer Ac Motor?
1. Use frequency converter to change power frequency speed regulation, large speed range, good stability and smoothness, and hard mechanical characteristics. That is, the rated load speed drops less. It is a stepless speed regulation. Suitable for most three-phase squirrel cage asynchronous motors.
2. Change the magnetic pole logarithmic speed regulation, which belongs to the class-level speed regulation, the speed regulation smoothness is poor, and is generally used for metal cutting machine tools.
3. Change the slip rate speed regulation.
(1) Rotor loop string resistance: used for Trimmer Ac Motor. The speed regulation range is small, the resistance consumes power, and the motor efficiency is low. Generally used in cranes.
(2) Change the power supply voltage speed regulation, the speed regulation range is small, the torque decreases greatly with the voltage drop, and the three-phase motor is generally not used. Used for single-phase motor speed regulation, such as fans.
(3) Cascade speed regulation, the essence is that the rotor introduces an additional electromotive force and changes its size to adjust the speed. It is also only used for winding motors, but the efficiency is improved.
(4) Electromagnetic speed regulation. Only for slip motors. By changing the current of the excitation coil, the mechanism is simple, but the control power is small. It is not suitable for long-term low speed operation.
4 hydraulic coupler speed regulation
