Motor driving system, and method and device for synchronous computation through reconstructing phase current and phase voltage by employing motor driving system

Abstract

The present invention discloses a motor driving system, and a method and a device for synchronous computation through reconstructing a phase current and a phase voltage by employing a motor driving system. The method comprises the following steps of: performing sampling of a direct current bus current, and performing reconstruction of a phase current according to the direct current bus current toobtain a three-phase current of a motor; in a reconstruction process of the three-phase current, obtaining two sampling currents in each PWM period to take as a two-phase current of the motor, and obtaining an instruction voltage or a sampling voltage; and performing synchronous conversion processing of the two sampling currents, the instruction voltage or the sampling voltage to allow a current vector and a voltage vector input to a flux observer to be in the same moment. According to the invention, the accuracy of an output angle of the flux observer can be ensured, the normal operation of the motor can be guaranteed, the calculated amount of the calculation method is small, and the calculation method is easy to implement.

Description

technical field [0001] The present invention relates to the field of motor drive technology, in particular to a synchronous calculation method for reconstructing phase current and phase voltage of a motor driver, a non-transitory computer-readable storage medium, and a synchronous method for reconstructing phase current and phase voltage of a motor driver A computing device and a motor drive system. Background technique [0002] High-performance AC motor drive systems often use vector control technology, such as field oriented control or direct torque control, etc. When using this type of control technology, it is necessary to know the accurate motor flux position or speed information. In applications such as industry, home appliances or automobiles, in order to reduce hardware costs or get rid of mechanical installation restrictions, a flux observer will be used to replace the position / speed sensor of the motor, and the flux linkage of the motor can be obtained through the ...

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Problems solved by technology

[0004] However, if a single measuring element is used to sample the current of the motor, the two sampled currents will be out of sync, and the two sampled currents will be out of sync with the command voltage or the sampled voltage. When the electrical frequency of the motor is high, or the digital When the sampling frequency (that is, the current loop control frequency and PWM switching frequency) is low, this phenomenon will cause deviations in the angle obtained by the flux linkage observer, thereby affecting the control performance of the motor

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