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Fan motors generally consist of two main parts, the motor body and the controller. Depending on the motor body and control method, they can be further divided into brushless DC motors and permanent magnet synchronous motors. These two types of motors have similar appearances, but the price of brushless DC motors is cheaper than permanent magnet motors, and the control accuracy is also lower. However, the torque ripple is larger.
Brushless DC motors generally use square wave drive and Hall sensors to obtain rotor position, which is used to force commutation. This scheme has a simple control method, low cost, and is widely used in current electric vehicle schemes. However, due to the sudden change in current caused by square wave drive commutation, the torque ripple is large, resulting in poor noise indicators and making it difficult to promote in the field of household appliances. Sine drive can avoid sudden changes in current during commutation, although the maximum torque will be reduced, it has significant advantages in noise indicators.