This is called vector control and can be done either with a variable frequency drive or a variable speed drive. In order to control the phase angle, phase power and other operational aspects of a motor, a variable frequency drive is necessary.
Speed control by varying the frequency and controlling the motor by means of a closed-loop system. The speed control may be implemented as a pulse width modulation control of a brushed DC motor or a vector control of a brushless DC motor.
Phase angle control, PWM, vector control and so on are the main types of motor speed control. Among them, PWM, or pulse width modulation is most commonly used in modern applications, since it is an efficient and simple method.
With brushless DC motors, speed control is more straightforward than with brushed DC motors. Each motor has a Hall sensor to detect the back magnetic pole, so it will move in the same direction as a permanent magnet will rotate.
PWM is a simple, low-cost, and energy-efficient way to control the speed of a brushless motor. It is used in most variable speed drives. In PWM, the voltage of each phase is modulated by a frequency within a certain range so that the current and the output voltage of the motor can be regulated.
This article will not discuss the full specifications of the motor, such as the stator construction, the number of poles, the number of slots, etc.
The numbers of poles and the slot count, as well as the phase sequence and voltages are shown in Table . The drive circuit of the motor is required for a brushless motor. The drive circuit of the motor is required for a brushless motor. When the number of poles of a brushless motor is greater than 4, it will be more complicated to control the rotating direction.
Some vector-based motors use the number of poles of the stator as the number of phases. The drive system of the motor generally includes a phase circuit and a rotor circuit. When the number of poles of the stator is greater than 4, it is not suitable to drive the motor by vector control.
Different types of vector control motors
There are three main types of vector control motors, including permanent magnet, wound rotor, and brushless.
Permanent magnet
The permanent magnet motor is a type of brushless motor, in which a Hall sensor is used to detect the back magnetic pole of the motor so that it will move in 01e38acffe
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