How does the three-phase ac motor achieve constant power or constant torque output
Is generally frequency converter to realize, in the power supply of power frequency 50 hz, motor with frequency converter to belt, the inverter output below 50 hz, the motor is constant torque output, but in the inverter output above 50 hz, the motor is constant power output
Three phase asynchronous motors running on motor. Three-phase asynchronous motor rotor speed is lower than the speed of the rotating magnetic field, rotor winding due to there is relative motion between magnetic field and induced electromotive force and the current, electromagnetic torque and interact with the magnetic field, the realization of energy conversion. Compared with the single-phase asynchronous motor, the three-phase asynchronous motor performs well and saves all kinds of materials. According to the structure of rotor, three-phase asynchronous motors can be divided into caged and winding type. The asynchronous motor structure of the cage rotor is simple, reliable, lightweight and inexpensive, and is widely used. The main drawback is the difficulty of regulating speed. The rotor and stator of a winding type three-phase asynchronous motor also set up a three-phase winding, which is connected by a slide ring, a brush and an external rheostat. Adjusting rheostat resistance can improve the starting performance of the motor and adjust the speed of the motor.
Is generally frequency converter to realize, in the power supply of power frequency 50 hz, motor with frequency converter to belt, the inverter output below 50 hz, the motor is constant torque output, but in the inverter output above 50 hz, the motor is constant power output.
