A method and circuit for detecting the rotor position of an ultra-high-speed permanent magnet synchronous motor
A rotor position detection and permanent magnet synchronous motor technology, which is applied in the control of generators, motor generators, and electromechanical transmissions, can solve the problems of difficult real-time and accurate detection of motor rotor positions, and achieve low cost and filter out interference Good signal and real-time effect
Active Publication Date: 2021-12-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a method and circuit for detecting the rotor position of an ultra-high-speed permanent-magnet synchronous motor to solve the problem that the rotor position of the ultra-high-speed permanent-magnet synchronous motor is difficult to detect accurately in real time in closed-loop control. Simple and effective, good real-time performance and suitable for ultra-high speed operation
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[0030] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0031] Such as figure 1 As shown, the structure diagram of the ultra-high-speed permanent magnet synchronous motor vector control system, including speed controller 1, d-axis current controller 2, q-axis current controller 3, Park inverse conversion module 4, SVPWM module 5, three-phase inverter 6. Ultra-high speed permanent magnet synchronous motor 7, rotor position estimation module 8, Clarke transformation module 9, Park transformation module 10, differential module 11. Speed controller 1 according to the received speed instruction and the speed estimation feedback signal obtained by the rotor position estimation module 8 and the differentiation module 11 output control signal As a given value of the q-axis current. The d-axis current controller 2 and the q-axis current controller 3 are based on the given current value and the current feedback signal ...
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The invention relates to a rotor position detection method and circuit of an ultra-high-speed permanent magnet synchronous motor. Three-phase terminal voltage signals of the motor are passed through an integrating circuit to obtain a three-phase stator flux linkage signal, and the phase of the stator flux linkage signal lags behind the terminal voltage signal by 90 degrees in electrical angle. The three-phase stator flux linkage passes through a low-pass filter circuit to filter out PWM switching noise and its harmonic noise. Based on the filtered stator flux linkage, a three-phase stator flux vector virtual neutral point is constructed. The filtered stator flux linkage is compared with the virtual neutral point to obtain the rotor position detection signal. Further, error compensation can be performed on the obtained rotor position signal. Furthermore, on the basis of the above accurate discrete rotor position information, continuous rotor position information can be obtained through simple speed integration, which can be used for closed-loop control of ultra-high-speed permanent magnet synchronous motors. The invention does not need calculation, has good real-time performance, high detection accuracy, strong robustness, simple structure and low cost, and is especially suitable for estimating the rotor position of an ultra-high-speed permanent magnet synchronous motor.
Description
technical field [0001] The invention belongs to the field of motor control, and relates to a method and a circuit for detecting the rotor position of an ultra-high-speed permanent magnet synchronous motor. Background technique [0002] Ultra-high-speed permanent magnet synchronous motors have the characteristics of small size, light weight, high power density, and good dynamic performance. With the development of power electronics technology and microprocessor technology, the application prospects Very broad. The control of permanent magnet synchronous motor requires accurate rotor position information. Traditional control systems usually use mechanical sensors to accurately obtain rotor position and speed. Commonly used sensors mainly include Hall sensors, photoelectric encoders, resolvers, and magnetic encoders. . However, the use of mechanical sensors will increase system cost, increase motor size, and reduce system reliability. Most importantly, it is difficult to choo...
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IPC IPC(8): H02P21/18
CPCH02P21/18
Inventor 李兵强宋迪施蓓蓓刘东兰天一邢化玲
Owner NORTHWESTERN POLYTECHNICAL UNIV