非连续信号注入的双三相永磁同步电机低噪声无位置传感器控制

Low-noise sensorless control of dual three-phase PMSM based on discontinuous signal injection

双三相永磁同步电机常采用注入高频信号的方式来估计位置,实现其低速时的无位置传感器控制.然而,该方法会导致严重的噪声问题,因此在低噪声应用场合受限.本文提出了一种双三相永磁同步电机的低噪声无位置传感器控制策略.首先,为了消除注入信号频率处的功率谱尖峰,采用半周期随机频率方波信号替代传统的固定频率方波信号;其次,利用随机绕组选择的方式将半周期随机频率方波信号断续注入到两套绕组中.因此,在保证注入信号幅值不变的情况下,进一步降低了高频响应电流的含量.此外,提出了一种高频信号解调方法来获取高频响应电流中包含的转子位置信息.电流功率谱密度分析证明该方法能够消除离散谱,从而降低注入信号导致的可听噪声.实验结果验证了该方法的可行性和有效性.

The high-frequency signal injection method is often used to estimate the position to realize the sensorless control of a dual three-phase permanent magnet synchronous motor(DTP-PMSM)at low speed.However,the high-frequency signal injection method suffers from serious audible noise problems,limiting it to low-noise applications.In this article,low-noise sensorless control for DTP-PMSM is proposed.First,the traditional fixed frequency square wave signal is replaced by a half-period random square wave signal to diffuse the power spectrum peaks at the injection frequency.Second,the half-cycle random frequency square wave signal is intermittently injected into the two sets of windings via random winding selection.Further,the high-frequency response current component is further reduced while the amplitude of the injection signal is kept constant.In addition,a high-frequency signal demodulation method is proposed to obtain the rotor position information contained in the high-frequency response current.The analysis of current power spectral density confirms that the proposed method can eliminate the discrete spectrum and reduce the audible noise caused by the injected signal.The experimental results verify the feasibility and effectiveness of the proposed method.