However some problems such as torque ripple increasing and average torque descending can be caused by phase commutation of the motor and may get even worse with the speed increasing.
永磁无刷直流电机具有结构简单、转矩大等显著优点，然而电机的换相过程会引起转矩波动增大、平均转矩下降等许多问题，随着电机速度的增加，这些问题会变得更为突出。
However some problems such as torque ripple increasing and average torque descending can be caused by phase commutation of the motor and may get even worse with the speed increasing.
永磁无刷直流电机具有结构简单、转矩大等显著优点，然而电机的换相过程会引起转矩波动增大、平均转矩下降等许多问题，随着电机速度的增加，这些问题会变得更为突出。
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