[to] square wave than sine wave output torque greater basis

Square wave driven square-wave motor has a theoretical basis compared with the output of square-wave motor driven by sine wave:

The air gap magnetic field of square-wave motor can be divided into fundamental and a series of harmonics , and the electromagnetic torque of square-wave motor is generated not only by the fundamental, but also by harmonics;
Simulation and analysis of electromagnetic field of electric motor under two driving modes:

The average electromagnetic torque driven by a square wave is 1.1x times the average electromagnetic torque driven by a sine wave,

But the actual application of the lower wave driven electromagnetic torque ripple is about 17%~20%, the torque ripple causes the motor vibration, noise, mechanical wear also affect the performance of the system, and the sine wave ripple generally can achieve 3%, relatively small impact on system performance;

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[to] square wave than sine wave output torque greater basis