Abstract
In this paper, the rotor position estimation performance of the sensorless scheme for permanent magnet synchronous motors (PMSMs) implemented through the injection of high-frequency square-wave voltage according to the frequency of the square-wave voltage is presented through HILS (Hardware In the Loop Simulation) experiments. An inverter using an IGBT device usually has a switching frequency of around 15 kHz. On the other hand, GaN devices that can be switched on and off at frequencies higher than 100 kHz have been recently developed, and research is being actively conducted to apply GaNs to a variable speed system. The purpose of this study is to conduct HILS experiments to analysis the rotor position estimation ability of the sensorless technique in cases where a high switching frequency was applied, such as GaN devices, with that of a system having a usual switching frequency, such as IGBT. In the HILS system used in this study, an inverter and motor model implemented with Simulink are located in a real-time simulator. A sensorless motor control method was implemented with an FPGA control board, which includes a PWM interrupt service routine of 100 kHz frequency and a harmonic injection and position detection algorithm. The HILS experiments show rotor position detection errors according to the various frequency of the harmonic voltage injected for estimating the rotor position with a PWM frequency of 100 kHz cases. According to the experimental results, good position estimation was possible not only when the harmonic of 10 kHz corresponding to 1/10 of the PWM frequency was injected, but also when the harmonic of 1 kHz corresponding to 1/100 of the PWM frequency was injected. The experiments suggest that position estimation errors decrease as the frequency of the harmonic voltage increases, and, based on the foregoing, it is thought that the application of a GaN device capable of realizing a high switching frequency in a variable speed drive system can be another advantage.
Highlights
Due to the increase in electro-mobility, industrial applications of permanent magnet motors are expanding [1]
The experiments suggest that position estimation errors decrease as the frequency of the harmonic voltage increases, and, based on the foregoing, it is thought that the application of a GaN device capable of realizing a high switching frequency in a variable speed drive system can be another advantage
In the case of a system with a 10 kHz switching frequency, the maximum frequency of the injection voltage frequency was 2 kHz, and in the case of a GaN device capable of 100 kHz switching, the experiments were conducted while increasing the frequency of the injection voltage up to 10 kHz
Summary
Due to the increase in electro-mobility, industrial applications of permanent magnet motors are expanding [1]. The position sensors of electric motors are vulnerable to external impacts so that they are damaged or deteriorated to the extent that they cannot work in some cases. To solve this problem, sensorless control techniques have been proposed [4,5,6,7,8]. In the case of the sensorless control of motors, the motors can be driven even without any position sensors such as encoders and resolvers so that the cost and system size are reduced, and reliability is enhanced because the risk of position sensor failure is reduced
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