Maximum torque current ratio control method and device

Abstract

The invention relates to a maximum torque current ratio control method and device. The method comprises the steps: carrying out open-loop starting on a motor so as to enable the motor to operate; after the first rotating speed of the motor reaches a preset frequency, carrying out rotating speed and current double-closed-loop control on the motor according to the actual rotating speed, determined through counter electromotive force, of the motor; when it is determined that a load is loaded on the motor and a driving voltage output to the motor by a three-phase inverter bridge is smaller than a voltage upper limit, adopting a maximum torque current ratio control method based on virtual signal injection to obtain a current vector angle given value; and controlling the motor to operate according to the current vector angle given value. According to the method provided by the embodiment of the invention, the dependence on the parameters of a permanent magnet synchronous motor is reduced in an implementation process while the defects of torque ripple, high-frequency noise, additional loss and the like existing in a traditional high-frequency signal injection method are effectively avoided; and requirements in the aspects of real-time calculation complexity, dynamic response performance, stability and the like in control are comprehensively considered while the operation efficiency of the permanent magnet synchronous motor is improved.

Description

technical field [0001] The present application relates to the technical field of permanent magnet synchronous motor control, in particular to a maximum torque-to-current ratio control method and device. Background technique [0002] The built-in permanent magnet synchronous motor (IPMSM for short) has excellent characteristics such as small size, high efficiency, and high power factor, and has been widely used this year. In order to realize the efficient control of IPMSM, the maximum torque current ratio (abbreviated as MTPA) control strategy is often adopted. The maximum torque-to-current ratio control strategy is a control method that can output greater torque under the same current. This control strategy is realized by setting the appropriate d-axis (direct axis) current given value, q-axis (quadrature axis) ) current given value, so that under the same output torque, the stator current amplitude reaches the minimum. The advantage of this method is that, on the one hand...

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