公开(公告)号：US08310192B2

公开(公告)日：2012-11-13

申请号：US12580748

申请日：2009-10-16

Applicant: Frederic Bonvin

Inventor： Frederic Bonvin

IPC: H02P1/04 ,  H02P3/00

CPC classification number: G11B19/28 ,  H02P6/182

Abstract: In BLDC motors driven via sensorless techniques, the BEMF signals in the motor coils may be used to detect the position of the motor such that speed of the motor may be accurately controlled. When detecting the BEMF signals, however, small perturbations occur which negatively impact the rotational torque of the motor. As a result, torque ripple may occur at regular intervals which may result in inefficiencies as well as audible noise. In various embodiments as described herein, the sampling of the BEMF signals may be done so at pseudo-random intervals such that the overall spectral energy that presents from the BEMF detections may be reduced at specific frequencies (such as fundamental sampling frequencies and harmonics thereof) and spread out over many more frequencies. Thus, despite the overall spectral energy being the same, the amplitude of any given frequency is lower as the sampling of the BEMF is less periodic.

Abstract translation: 在通过无传感器技术驱动的BLDC电机中，电机线圈中的BEMF信号可用于检测电机的位置，从而可以精确控制电机的速度。 然而，当检测到BEMF信号时，会发生小的扰动，这会对电动机的转矩产生负面影响。 结果，扭矩波动可以以规则的间隔发生，这可能导致低效率以及可听见的噪声。 在本文所述的各种实施例中，BEMF信号的采样可以以伪随机间隔进行，使得可以在特定频率（例如其基本采样频率和谐波）处降低从BEMF检测呈现的总频谱能量， 并分布在更多的频率上。 因此，尽管总体光谱能量相同，但是任何给定频率的振幅都较低，因为BEMF的采样周期性较差。