Abstract
An efficient estimation of the rotor position has always been a premise of the reliable operation for the interior permanent magnet synchronous motors (IPMSM), especially for low-speed conditions because of the small back electromotive force (EMF) and low signal-to-noise ratio (SNR). The commonly used observation method, e.g., sliding mode observer (SMO), is suitable for these surface mounted motors and has no great adaptability to the saliency. In this paper, a novel rotor position (including the real-time position and initial position) estimation method was proposed based on the traditional high-frequency signal injection method. Firstly, high-frequency signals were injected to induce the high-frequency current components which contain the rotor position information. Then, the sliding discrete Fourier transform (SDFT) algorithm was used to extract the amplitudes of the induced current components which could be used to get the real-time and initial rotor positions by a proportional integral (PI) regulator and a polarity identification. Lastly, with the established experiments’ platform, the estimation tests of the rotor position at a low speed have been completed to make verification of the effectiveness of the approach studied in this paper.
Highlights
Permanent magnet synchronous motors (PMSMs) are widely used in industrial areas, e.g., manufactures, household appliances, transportation, or even aerospace field for their sorts of advantages [1,2,3]
(1) Methods based on the motor back electromotive force (EMF), e.g., sliding mode observer (SMO) and extended Kalman filter (EKF); these methods are usually suitable for surface mounted motors and have no great adaptability to the saliency [7, 8]. (2) For interior permanent magnet synchronous motors (IPMSM), the common methods to estimate the rotor position are based on high-frequency signal injection because the position information would be contained in the induced signals [9,10,11]
An experimental platform for the IPMSMs was established, as shown in Figure 4, in which the control processor is TMS320F28335. e detailed parameters of the studied IPMSM are shown in Table 1. e frequency of the injected high-frequency voltage is 1250 Hz and the amplitude is 6 V
Summary
Permanent magnet synchronous motors (PMSMs) are widely used in industrial areas, e.g., manufactures, household appliances, transportation, or even aerospace field for their sorts of advantages [1,2,3]. (2) For IPMSMs, the common methods to estimate the rotor position are based on high-frequency signal injection because the position information would be contained in the induced signals [9,10,11]. The rotor initial position information exists in the induced high-frequency current components whether the motor is stop or in motion state, the N/S polarity of the rotor pole cannot be identified directly. In order to effectively estimate the real-time and initial rotor positions for the IPMSMs, a novel estimation strategy was proposed in this paper based on the combination of high-frequency signal injection and the SDFT algorithm. En, the SDFT algorithm is used to make an effective signal extraction of the induced current components to ensure the real-time rotor position estimation.
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