Motor flux-weakening control method

Abstract

The invention discloses a motor flux-weakening control method and relates to a feedforward control-based voltage feedback compensation method. The motor flux-weakening control method comprises the following steps: determining a flux-weakening limiting voltage Usmax according to the DC bus voltage of a permanent magnet synchronous motor, and calculating through d and q shaft voltages to obtain a terminal voltage Us; designing a PI regulator according to the flux-weakening limiting voltage Usmax and the terminal voltage Us so as to obtain a flux-weakening regulation current Odr1; considering the parameter perturbation of inductance and permanent magnet flux linkage, and calculating on the basis of a theoretical formula to obtain a flux-weakening feedforward current Idr2; and finally superposing the flux-weakening regulation current Idr1 and the flux-weakening feedforward current Idr2 to obtain a straight shaft compensation current IdrFW of a flux-weakening algorithm. According to the motor flux-weakening control method, the flux-weakening control performance of the permanent magnet synchronous motor can be effectively enhanced and the problems that the parameters are difficult to regulate and the dynamic property is not ideal in the prior art are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and relates to a voltage feedback compensation method based on feedforward control, in particular to a motor field weakening control method. Background technique [0002] Due to its advantages of high power density, high reliability and high efficiency, permanent magnet synchronous motor (PMSM) has been widely used in high-demand speed control systems such as machining equipment, robots, and electric vehicles. Due to the permanent magnet excitation, the excitation magnetic field cannot be adjusted through the excitation winding, and the permanent magnet synchronous motor must adopt the field weakening technology to meet the speed regulation requirements of a wide speed regulation range. The use of high-performance field-weakening technology can continuously expand the speed range of the motor's constant power operation and maintain a high working efficiency. [0003] At present, the ex...

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Problems solved by technology

[0006] The problem to be solved by the present invention is: the existing field weakening control technology of permanent magnet synchronous motors has the problems of difficult adjustment of parameters and unsatisfactory dynamic performance. A voltage feedback compensation method based on feedforward control is proposed to improve the weak field Dynamic response performance of magnetic control

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