Thông tin vị trí ban đầu của rotor trong động cơ đồng bộ nam châm vĩnh cửu (PMSM) cần có được trước khi khởi động. High Frequency Injection (HFI) là phương pháp phổ biến để ước lượng vị trí ban đầu. Bài viết này đề xuất phương pháp kết hợp cả hai phương pháp trên. Ban đầu, vị trí sector chứa vector trục | Vol 3 2 2022 Measurement Control and Automation Website https ISSN 1859-0551 Ước lượng vị trí ban đầu động cơ SPMSM dựa trên phương pháp kết hợp Short- Pulses Injection và High-Frequency Injection Initial Position Estimation for SPMSM Based on A Method Combined Short- Pulses Injection and High-Frequency Injection Hoàng Duy Tính1 Phùng Anh Tuấn1 1 Khoa Điện Trường Điện Điện tử Trường đại học Bách Khoa Hà Nội E-mail Abstract Before starting the initial rotor position is required in permanent magnet synchronous motors PMSM . High Frequency Injection HFI is a common method for initial position estimation. However the conventional HFI method is only applicable to the interior permanent magnet synchronous motors IPMSM because of the significantly different d-axis and q-axis inductance characteristics. Meanwhile for the surface- mounted permanent magnet synchronous motors SPMSM this difference is not significant. To solve this problem Short Pulses Injection SPI uses series pulses that cause an Inductance Saturation Effect and then considers the feedback currents to estimate the rotor position. The disadvantages of this method are that the estimation time depends on the current response speed as well as requires the motor to be at the saturation boundary to ensure an apparent saturation effect. This paper proposes a combined method based on these two methods. Initially the position of the sector containing the d axis vector is determined by SPI. Then injecting a voltage vector causes inductance saturation creating a significant difference between L_d and L_q this vector position is at the middle of the sector determined in the former stage . At the same time HFI estimates the initial rotor position. To verify the method a model established from a ceiling fan motor is simulated by ANSYS MAXWELL and MATLAB SIMULINK. Compared with existing methods this method offers better accuracy and speed and is suitable for applications with .
