SPMSM sensorless vector control method based on nonsingular fast terminal sliding mode observer

Abstract

The invention discloses an SPMSM sensorless vector control method based on a nonsingular fast terminal sliding mode observer, and belongs to the technical field of motor control. The method comprises the following steps of: firstly, establishing a voltage mathematical model of a permanent magnet synchronous motor based on a two-phase static coordinate system, and reconstructing the voltage mathematical model into a stator current state equation; secondly, designing an integral type nonsingular sliding mode surface by taking a current observation error as a state variable, and deducing a composite control law to obtain an extended counter electromotive force; and finally, reconstructing the back electromotive force to realize high-frequency filtering, and extracting the position and speed of a motor rotor based on a software phase-locked loop principle to realize sensorless control of the motor. Compared with a method using a traditional sliding-mode observer, the method can accurately estimate the position and speed information of the motor rotor in the zero-low-speed stage and the medium-high-speed stage, has high robustness, can effectively restrain buffeting in a control system, solves the phase lag problem and enables high steady-state precision and dynamic performance for the system.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a SPMSM sensorless vector control method based on a non-singular fast terminal sliding mode observer. Background technique [0002] Permanent magnet synchronous motors have high energy density, low noise during operation, lower torque fluctuations than other motors, and are easy to maintain. Therefore, they are used in military and commercial drones, as well as electric vehicles and national defense. All have been widely used, which makes the permanent magnet synchronous motor control speed regulation system become a hot research topic at home and abroad. In the actual application of the system, the sensor is generally used to directly obtain the rotor position and speed information. However, the installation of such mechanical sensors increases the cost of the entire system, and has certain requirements on the surrounding working environment, which limits the scope of use...

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Problems solved by technology

[0007] Aiming at the permanent magnet synchronous motor control speed regulation system using the sliding mode observer to estimate the motor rotor position and speed information, there will be problems such as high-frequency chattering, noise, and phase delay. The present invention proposes a non-singular fast terminal sliding mode observation The SPMSM sensorless vector control method of the device can realize the sensorless vector control of the surface-mounted permanent magnet synchronous motor

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