高磁负荷单相无刷直流电机的转矩波动抑制

在具有较高磁负荷的单相无刷直流电动机中,不均匀气隙结构以及通常存在的电流尖峰将导致尖峰定位转矩的产生,从而造成合成转矩特性的严重畸变。该文在稳态运动磁场计算及场路耦合计算的基础上,分析了气隙渐变结构中各结构要素对定位转矩峰值的影响及合理设计,并研究了各种驱动模式对转矩特性的影响,提出了采用有限转角的电压驱动模式降低转矩波动及噪声。样机试验表明,采用一定的关断角度可以有效降低电机噪声及提高性能。

Torque Ripple Reduction in Single Phase Brushless DC Motors of High Magnetic Load

In single-phase brushless DC motors with high magnetic load, the typical asymmetric air-gap structure will lead to high cogging torque peaks, which will distort the torque envelope together with the high current peaks commonly found. To get rid of the high torque ripples, the design of the crucial structural factors for the tapered air-gap structure are analyzed, and different drive methods are evaluated based on the field-circuit coupling calculation. One simple drive method is proposed by adding one proper shut-off zone into the driving voltage. The tests show that the performances are improved and noise level is decreased.