Permanent magnet synchronous motor angle identification system and method

Abstract

The invention discloses a permanent magnet synchronous motor angle identification system and method. The system comprises: a phase-locked loop used for calculating an aperiodic DC component of an angle; a self-adaptive angle compensator used for combining the non-periodic direct current component of the angle with the error angle to calculate and obtain an estimated electrical angle; a differentiator used for differentiating the estimated electrical angle to obtain an estimated rotating speed; an adaptive controller used for obtaining a trigonometric function coefficient of the initial periodic angle so as to obtain an estimated periodic angle; and an integrator used for obtaining a target trigonometric function coefficient so as to obtain a target periodic angle. According to the self-adaptive control principle, the trigonometric function coefficient of the periodic angle is identified in real time, and then the periodic angle is formed through combination; and in the control process, the periodic angle and the angle obtained through calculation of the phase-locked loop are added, the observation angle precision of position sensorless control is improved, the control performance can be greatly improved, and speed and current fluctuation is reduced.

Description

technical field [0001] The present invention relates to the technical field of motor control, and more specifically, to a permanent magnet synchronous motor angle identification system and method. Background technique [0002] Electrical Machine (Electrical Machine) is essentially an energy conversion device (interchange of electrical energy and mechanical energy). Torque rotation is generated through the magnetic field coupling between the stator and rotor. The magnetic field of the stator part is generated by current, and the magnetic field of the rotor part can be passed by current or permanent magnet. produce. The rotor part of the permanent magnet synchronous motor uses permanent magnets to form a magnetic field without additional current, so the motor has less loss and higher power density. It is precisely because of the advantages of high efficiency and energy saving that permanent magnet synchronous motors can be widely used in household products, especially in vari...

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Problems solved by technology

[0003] Due to the harsh internal working conditions of the compressor, the permanent magnet synchronous motor is controlled by a phase-locked loop-based sensorless position sensor to further reduce costs. However, the load of the single-rotor compressor is not stable, and the load changes periodically with the mechanical angle, resulting in periodic changes in the motor angle. The phase-locked loop cannot track the period

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