Low-noise sensorless control of dual three-phase PMSM based on discontinuous signal injection
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.
万方数据
维普
