Abstract
In order to improve the accuracy of the commutation of the brushless DC motor rotor, considering that the traditional modulation method will be affected by the conduction voltage drop of the switch tube and the freewheeling diode, resulting in the non-conduction phase freewheeling during the non-commutation period Torque ripple, which is also the main cause of torque ripple. Therefore, it is a positionless control method that controls the non-conducting phase torque ripple PWM_ON_PWM modulation. However, due to PWM modulation, off-phase freewheeling will inevitably occur. For this, the resonant DC link soft-switching inverter topology is used to suppress the off-phase freewheeling. Through experiments and simulations, it is proved that these combined methods can effectively reduce the size of torque ripple.
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