A Full Speed Position Sensorless Control Method for Load Torque Compensation of Permanent Magnet Synchronous Motor
A permanent magnet synchronous motor and load torque technology, which is applied in motor control, motor generator control, electronically commutated motor control, etc., can solve problems such as low bandwidth and poor dynamic performance, and achieve improved signal-to-noise ratio and speed fluctuation Small size, enhanced system dynamic performance and anti-interference ability
Active Publication Date: 2021-02-26
杭州领芯微电子有限公司
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[0003] In order to overcome the problems of low bandwidth and poor dynamic performance of existing permanent magnet synchronous motor position sensorless control, the present invention provides a full-speed position sensorless control method based on expansion state observer load torque observation compensation
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[0047]The present invention will be further described below in conjunction with the drawings.
[0048]ReferenceFigure 1 ~ Figure 7, A full-speed sensorless control method for permanent magnet synchronous motor load torque compensation, real-time estimation of load torque and compensation, including the following steps:
[0049]1.1 Position rotor estimation strategy. The low-speed stage uses high-frequency injection to estimate the rotor position, and the high-speed stage uses a sliding mode observer to estimate the rotor position, and a hysteresis switching strategy is designed to smoothly switch between high and low speeds. The process is as follows:
[0050]1.1.1 The low-speed stage adopts the high-frequency injection method to ensure that the voltage vector required for vector control remains unchanged during 2 consecutive pulse width modulation cycles. Inject 1 pair of positive and negative voltage pulses in the estimated d axis. The advantage of this is that one The PWM cycle only needs...
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A full-speed position sensorless control method for load torque compensation of permanent magnet synchronous motors. Aiming at the problem of high performance control of permanent magnet synchronous motors without position sensors in the full speed range, a hybrid load torque compensation based on extended state observer (ESO) is proposed. Position estimation strategy; high-frequency voltage pulse injection method is used in the low-speed stage, and the sliding mode observer method based on the integral sliding surface is used in the middle and high-speed stage to realize position estimation in the full speed range; and a hysteresis switching strategy is designed to ensure that any steady-state speed There is only one method to provide estimated position and estimated speed for closed-loop control; at the same time, in order to improve the anti-disturbance ability of the system, ESO is designed for load torque estimation and compensation, and the dynamic performance and anti-disturbance ability of the system are improved.
Description
Technical field[0001]The invention relates to the field of permanent magnet synchronous motor control, in particular to a position sensorless control method for permanent magnet synchronous motor load torque compensation.Background technique[0002]Permanent magnet synchronous motor position sensorless control technology is widely used in aerospace, transportation, home use because it eliminates position or speed sensors, reduces system costs, reduces motor volume, reduces system failure rates, and enhances system adaptability. Electric appliances and other occasions. However, due to the influence of position and speed estimation errors, the speed loop bandwidth of a position sensorless system will be lower than that of a position sensor, which will cause the system to produce large speed fluctuations when the load is suddenly loaded or unloaded. , Reduce the dynamic performance of the system, thereby limiting the development of position sensorless control technology in the field of h...
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IPC IPC(8): H02P21/20H02P21/18
CPCH02P2203/11H02P21/18H02P21/20
Inventor 吴春傅子俊孙明轩
Owner 杭州领芯微电子有限公司