Electric machine control method and device in hybrid motor

Abstract

The invention discloses a motor control method used in hybrid cars and a device thereof. The method is that firstly, the position and the rotating speed value of a motor rotator, an input current value of a motor, the inverter DC voltage value and a torque command are acquired by a microprocessor by an interface circuit; secondly, the three-phase voltage value required for the operation of the motor is obtained after computing; and finally the three-phase voltage value is converted into a signal to control the work of the inverter by an SVPWM in order to control the work of the motor. The saturation of a current regulator is judged from the PWM modulation index, the direct-axis current command value and the quadrature-axis current command value are automatically corrected according to the state of saturation, so as to automatically adapt to the changes of busbar voltage and motor parameters and achieve good static and dynamic performance indexes. The control device can automatically adapt to the changes of the inverter DC busbar voltage, can automatically complete natural switching of operation status between a weak sector and a non-weak sector, can precisely and rapidly respond to the torque control requirements, so as to achieve the operation within the wide range of speed.

Description

technical field [0001] The present invention relates to a control device for a permanent magnet synchronous motor, in particular to a control method and a control device for a permanent magnet synchronous motor in a system when the permanent magnet synchronous motor is used as one of the output powers in a hybrid vehicle. The device is a control device for adaptive DC bus voltage variation. Background technique [0002] The permanent magnet synchronous motor, especially the embedded permanent magnet synchronous motor (IPM) with embedded permanent magnets, has the advantages of high-performance adjustable speed operation, so it is widely used in the field of hybrid electric vehicles, and its high-performance torque control can Satisfactory running performance can be obtained at low speed through optimized maximum torque per ampere control technology, but as the speed increases, the torque will decrease due to the limitation of the current regulator and voltage source. The ro...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that in the current permanent magnet synchronous motor, especially the IPM motor control method in the hybrid electric vehicle, the voltage change caused by the temperature rise or the DC voltage bus will cause the voltage regulator to work unstable. In order to solve the problem of instability of the entire system, a new field weakening control method and a device for realizing the method are proposed. Using this method to control the motor work can well adapt to the change of the bus voltage and improve the stability of the entire system. excellent control performance

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