Self-adaption field weakening control method based on rotor position angle

Abstract

A field weakening control method based on rotor position angle self-adaption comprises the following steps that S1, a motor controller collects the rotating speed of a motor, the torque of the motor, the stator current, the angular speed of the motor under a natural coordinate system and the direct-current bus voltage of the motor controller in real time, and the threshold range [delta Umin, delta Umax] of voltage deviation is set; s2, judging the current operation condition of the motor according to the motor rotating speed and the motor torque; s3, judging whether the voltage deviation between the direct-current bus voltage and the back electromotive force meets the requirement or not, and if the requirement is met, directly outputting the direct-axis current and the quadrature-axis current currently requested by the motor; if the requirement is not met, entering the step S4; s4, performing adaptive control on the rotor position angle to enable the voltage deviation between the direct current bus voltage and the back electromotive force to be within a set threshold range; s5, according to the rotor position angle obtained after self-adaptive control, the direct-axis current and the quadrature-axis current of the motor are redistributed; and S6, the motor controller outputs the redistributed direct-axis current and quadrature-axis current.

Description

Technical field [0001] The present invention relates to the field of motor control technology, particularly to a field of magnetic weak control based on rotor position angle adaptation. Background [0002] Permanent magnet synchronous motor has a wide range of speed regulation, high power density, high efficiency advantages, permanent magnet synchronous motor drive system in the low speed output large torque, high speed can achieve constant power speed regulation, is widely used in the field of electric vehicles. [0003] Permanent magnet synchronous motor in the high-speed constant power operation stage often use weak magnetic speed control method, in the weak magnetic control stage, with the increase of motor speed, the inverter output voltage reaches the limit, in the saturation state is easy to cause the motor out of control, so the need for weak magnetic spread speed. In practical applications, usually the use of the table or formula method to achieve weak magnetic field exp...

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