A Torque Control Strategy of Permanent Magnet Synchronous Motor Based on Flux Linkage Vector

Abstract

The invention discloses a permanent magnet synchronous motor torque control strategy based on a flux linkage vector. According to the strategy, on the basis of finite set model prediction control, through analyzing internal relations between an electromagnetic torque reference value, a stator flux linkage reference value and a flux linkage vector phase angle, the electromagnetic torque reference value and the stator flux linkage reference value are converted into a flux linkage vector reference value, and a value function based on a flux linkage vector error is constructed. According to the strategy, the value function is utilized to evaluate action effects of alternative voltage vectors of a control set, switch frequency reduction for loss reduction is realized, a finite control set mode is employed, an optimum duty ratio of each alternative voltage vector is acquired through calculation when the value function is made to be smallest, the optimum duty ratio is further utilized, and the torque control strategy based on the flux linkage vector is realized.

Description

Technical field [0001] The invention belongs to the field of motor control. More specifically, it relates to a permanent magnet synchronous motor torque control strategy based on a flux linkage vector, which is suitable for high-precision servo drive control of the permanent magnet synchronous motor. Background technique [0002] Because of its high energy density, high torque-to-inertia ratio, low price and high efficiency, permanent magnet synchronous motors have been widely used in industrial production such as track traction, textile, printing and metallurgy in recent years. Permanent magnet synchronous motor control technology has also become a scientific research. Hotspots in the field of research. [0003] In order to obtain a good torque and flux linkage control effect, in 2013, there was a technical solution based on the deadbeat control idea to calculate and modulate the volt-second voltage vector that makes the torque and flux linkage in the next control cycle without de...

AI Technical Summary

Problems solved by technology

[0005] In addition, the traditional predictive torque control often selects the optimal vector through the value function and then performs duty cycle modulation

In this way, the voltage vector originally added to the duty cycle to obtain better torque and flux linkage control effects may not be selected, that is, the traditional predictive torque control cannot effectively use the duty cycle modulation

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