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Common variable frequency motor include: three-phase asynchronous motors, brushless DC motors, brushless motors and switched reluctance motors. Here we explain the principles of inverter motor control what?

Inverter motor control principle
Inverter motor control strategies usually are: the base speed constant torque control, constant power control above base speed, ultra-high speed range weakening control.
Base rate: As the motor would run counter electromotive force is generated, and the counter-electromotive force size is usually proportional to the speed. Therefore, when the motor is running to a certain speed, due to the size of the counter electromotive force applied voltage of the same size, then called the base rate of speed.
Constant torque control: motor at the base speed, the constant torque control. At this speed is proportional to motor back EMF E and the motor. And motor output power and motor torque and speed proportional to the product, so this time is proportional to motor power and speed.
Constant Power Control: When the motor speed exceeds the base by adjusting the excitation current to the motor so that the motor's back-EMF remained constant, in order to improve the speed of the motor. At this time, the motor output power remains substantially constant, but inversely proportional to the motor torque and speed decrease.
Weakening control: When the motor speed exceeds a certain value, the magnetizing current is quite small, basically can not be adjusted, this time into the field weakening control phase.