Model prediction-based doubly salient permanent magnet synchronous motor direct torque control method

A permanent magnet synchronous motor, direct torque control technology, applied in motor generator control, AC motor control, electronic commutation motor control, etc. Problems such as large moment fluctuations

Active Publication Date: 2014-04-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention proposes a torque control method for doubly salient pole permanent magnet synchronous motor based on model prediction, the purpose of which is to effectively reduce the switching frequency of the inverter, reduce the torque fluctuation of DSPM, and solve the problem of traditional direct torque control strategy Large control error, variable switching frequency of the inverter (sometimes very high), large fluctuations in motor output torque

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  • Model prediction-based doubly salient permanent magnet synchronous motor direct torque control method
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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0027] 1. Establish the mathematical model of DSPM

[0028] The basic mathematical equation of a doubly salient permanent magnet motor is as follows:

[0029] [U]=[R]×[I]+p[ψ] (1)

[0030] [ψ]=[ψ r ]+[ψ m ]=[L]·[I]+[ψ m ] (2)

[0031] Among them, [U] is the column vector of each phase winding voltage; [R] is each phase winding resistance matrix; [ψ] is each phase permanent mag...

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Abstract

The invention discloses a model prediction-based doubly salient permanent magnet synchronous motor direct torque control method. The model prediction-based doubly salient permanent magnet synchronous motor direct torque control method comprises the following steps that: stator current and rotor angular speed of a doubly salient permanent magnet synchronous motor are acquired; under eight groups of inverter switching vector signals, and based on the stator current and the rotor angular speed, the output current of the motor at a next moment of each kind of inverter switching vector is predicted according to constraint relationships between current variation quantity, micro components and voltage, current under eight kinds of switching states; based on a direct torque control theory, motor torque and motor magnetic flux linkage at the next moment of each kind of inverter switching vector can be further predicted; and related voltage vectors are selected reasonably with realizing minimum total quantity of the torque and the magnetic flux linkage adopted as a target, and therefore, the operation of an inverter can be controlled real time. With the model prediction-based doubly salient permanent magnet synchronous motor direct torque control method of the invention adopted, switching frequency and loss can be effectively decreased, and torque fluctuation of the motor can be decreased.

Description

technical field [0001] The invention relates to the technical field of doubly salient permanent magnet synchronous motors, in particular to a method for direct torque control of doubly salient permanent magnet synchronous motors based on model prediction. Background technique [0002] As early as the 1950s, the concept of Doubly Salient Permanent Magnet Synchronous Machine (DSPM) was proposed by Rauch and Johnson, but due to the limitation of the magnetic properties of permanent magnet materials (AlNiCo), DSPM is relatively As far as the electric excitation synchronous motor is concerned, it has a large volume, low power factor and low efficiency, so its development speed has been relatively lagging behind for a long time. With the emergence of the third-generation rare-earth permanent magnet material NdFeB (NdFeB), the development of DSPM motors has been further developed. [0003] With the advancement of related technologies, the research on DSPM continues to deepen, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P27/06
Inventor 徐伟杨文武曲荣海吴震宇
Owner HUAZHONG UNIV OF SCI & TECH
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