A salient-pole PMSM position and speed estimation at standstill and low speed by a simplified HF injection method

Abstract

This paper addresses the estimation of a permanent magnet synchronous machine mechanical position and speed estimation at low speed and standstill. The method is based on the injection of an additive voltage at High Frequency (HF), which exploits the position dependency to the magnetic saliency. Unlike the usual HFI method, this estimator has a simple structure with only one filter. The simulation results prove the efficacy of the estimation under no load and with a load torque in the low speed region and at standstill. The mechanical position estimation errors are lower than 0.035rad (2°).

Research Review on Sensorless Measurement Technology of Permanent Magnet Synchronous Motor

“…S. Medjmadj et al designed a simple estimator structure and reduced the three filters of the traditional method to one. The simulation results show that the measurement error of the rotor position in steady state is less than 2° [13].…”

A Study on Accurate Initial Rotor Position Offset Detection for a Permanent Magnet Synchronous Motor Under a No-Load Condition

“…In the case of high-frequency injection, however, signal processing such as DFT, BPF, or LPF is required to remove the high-frequency component of the current caused by a specific high-frequency signal to be injected. In the SPMSM or a motor with low salient polarity, the difference in inductance is not significant, so the highfrequency injection method's accuracy may decrease [14][15][16][17][18]. Moreover, when it is necessary to detect the resolver offset in a no-load state, such as mass production, the rotor may move slightly, and the precision may decrease.…”

A Position Sensorless Control of an Axial Flux-Switching Permanent-Magnet Motor Based on High-Frequency Pulsating Voltage Vector Injection

“…However, because the permanent magnets are located on the rotor, the cooling conditions are poor and the heat dissipation is difficult, which leads to irreversible demagnetization of the permanent magnets, which affects the motor operation and power density. Therefore, stator permanent magnet motors, double salient permanent magnet (DSPM) motors and flux switching permanent magnet (FSPM) motors have been extensively studied in recent years [1][2][3][4].…”