Square wave control uses Hall sensors or sensorless estimation algorithms to obtain the position of the motor rotor, and then performs 6 commutations (every 60 ° commutation) within a 360 ° electrical cycle based on the rotor position. Each reversing position motor outputs a specific direction of force, so it can be said that the position accuracy of square wave control is electrical 60 °. Due to this control method, the phase current waveform of the motor is close to a square wave, so it is called square wave control. The advantage is that the control algorithm is simple, the hardware cost is low, and using a controller with ordinary performance can achieve a higher motor speed; The disadvantages are large torque fluctuations, certain current noise, and insufficient efficiency. Square wave control is suitable for situations where the rotational performance of the motor is not highly required.