分析了传统的PWM_ON调制方式对无刷直流电动机在非换相期间由于截止相的反并联二极管续流而导致转矩脉动的原因。
The torque ripple caused by diode freewheeling of the inactive phase during non-commutation state of PM brushless DC motor(BLDCM)when using the PWM_ON type of pulse width modulation was analyzed.
统计结果表明：体外反搏使剪切应力的平均值、变化范围及变化速度都发生了变化，即增加了血流和剪切应力的脉动性。
The statistical results show that the average, the range of change, and the changing rate were augmented with ECP, i. e. the phasic characteristics of shear stress were increased.
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