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Permanent magnet synchronous motor direct torque control optimization method

A technology of direct torque control and permanent magnet synchronous motor, which is applied in motor generator control, electronic commutation motor control, control system, etc. Torque pulsation, the effect of reducing programming difficulty

Inactive Publication Date: 2018-03-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct torque control system has defects such as torque ripple, switching frequency variation, and complicated programming.

Method used

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  • Permanent magnet synchronous motor direct torque control optimization method
  • Permanent magnet synchronous motor direct torque control optimization method
  • Permanent magnet synchronous motor direct torque control optimization method

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Embodiment Construction

[0025] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0026] see figure 1 and figure 2 , the present invention comprises the following steps:

[0027] Step 1: Determine the difference Δψ, ΔT between the given flux linkage and torque and the actual flux linkage and torque;

[0028] Step 2: Judging the size of Δψ, choose to increase, decrease or maintain the flux linkage;

[0029] Step 3: Judging whether ΔT exceeds the error torque limit value;

[0030] If ΔT exceeds the torque error limit value, select a non-zero voltage vector;

[0031] If ΔT does not exceed the torque error limit value, then select the ze...

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Abstract

The invention discloses a permanent magnet synchronous motor direct torque control optimization method, which comprises the steps of: determining a difference value delta Psi between a given flux linkage and an actual flux linkage, and a difference value delta T between given torque and actual torque at first; increasing or reducing the flux linkage if |delta Psi| exceeds a flux linkage error limit value |delta Psi e|, and maintaining the flux linkage if |delta Psi| does not exceed the flux linkage error limit value |delta Psi e|; using a non-zero voltage vector if the delta T exceeds a torqueerror limit value, and using a zero-voltage vector if the delta T does not exceed the torque error limit value; and adopting a new theta angle determination method, judging a sector where the flux linkage locates, and selecting a voltage vector to be applied currently according to a given voltage vector switching table. The permanent magnet synchronous motor direct torque control optimization method can reduce fluctuations of the torque and the flux linkage, can simplify the difficulty of programming, and is easier in engineering implementation.

Description

technical field [0001] The invention belongs to the technical field of direct torque control of permanent magnet synchronous motors, and in particular relates to an optimization method for direct torque control of permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motor (PMSM) has become a research hotspot and has been widely used due to its simple structure, stable speed, fast dynamic response, strong overload capacity, high reliability, diverse structure, and wide application range. [0003] Direct torque control (DTC) abandons the decoupling idea in the traditional vector control, but replaces the rotor flux orientation with the stator flux orientation, cancels the rotation coordinate transformation, and weakens the dependence of the system on the motor parameters. Through real-time Detect the stator voltage and current of the motor, calculate the magnitude of the torque and flux linkage, and compare them with the given values ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/30H02P21/05
CPCH02P21/30H02P21/05
Inventor 胡红明方贺肖寒刘雪骄
Owner WUHAN UNIV OF TECH