What are the methods of positive sine wave control of micro brushless DC motor?

The aim of the micro brushless DC motor's positive sine wave control is to apply a specific voltage to the motor winding in order to generate positive sine wave current in the motor winding. By adjusting the amplitude and phase of the sine current, the motor torque can be adjusted. What are the brushless DC motors' positive sine wave control strategies? Let's take a look at the following.

Simple sine wave control: Apply a specific voltage to the motor winding to create a sine wave in the motor phase voltage. The motor phase current is also a sine wave since the motor winding is an inductive load. By adjusting the motor phase voltage's amplitude and phase The phase and amplitude of the current can be easily controlled for the voltage loop control.

Complex sine wave control: Unlike simple sine wave control, complex sine wave control directly controls the phase and amplitude of the motor's phase current to accomplish the goal of controlling the motor. Since the phase current represents a positive signal, a decoupling operation of the current is necessary. Field-oriented control and direct torque control are two popular options.

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