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A Control Method of Permanent Magnet Motor Based on Sliding Mode Switching

A technology of permanent magnet motor and control method, which is applied in electronic commutation motor control, motor generator control, AC motor control, etc. Dynamic performance, effect of increasing convergence speed

Active Publication Date: 2022-05-27
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the working condition changes drastically, the traditional PI controller cannot meet the requirements of the dynamic performance of the system in some occasions due to its own limitations, and the sliding mode control can make up for this problem very well.

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  • A Control Method of Permanent Magnet Motor Based on Sliding Mode Switching
  • A Control Method of Permanent Magnet Motor Based on Sliding Mode Switching
  • A Control Method of Permanent Magnet Motor Based on Sliding Mode Switching

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] The invention provides a permanent magnet motor control method based on sliding mode switching, which can improve the control precision and performance of the motor control system.

[0046] like figure 1 As shown, a method for controlling a permanent magnet motor based on sliding mode switching includes the following steps:

[0047] Step 1: Collect the real-time position θ of the rotor in the permanent magnet motor, and obtain the current speed ω of the motor by calculating the derivation of θ with respect to time t;

[0048] Step 2: Collect the three-phase current value i of the permanent magnet motor a , i b , i c , according to the Clarke transformation, the current component i of the three-phase current in the two-phase stationary coordinate system is obtained α , i β ; where i a , i b , i c Respectively represent the components of t...

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Abstract

The invention discloses a permanent magnet motor control method based on sliding mode switching. Firstly, the mathematical model of the permanent magnet motor is established; The permanent magnet motor speed loop controller is used to control the q-axis current; by using two sliding mode control switching methods, the error of the system output speed is 0 as the control target, and the super helical sliding mode is used at the initial stage of the system, so that the state The variable approaches the origin; after the threshold is met, it switches to an exponential approach law, so that the state variable can quickly approach 0, and finally the motor speed is stabilized at a given value. This method can increase the convergence speed of the system state variable, thereby improving the dynamic performance of the system , while making the system robust to external matching disturbances.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a control method of a permanent magnet motor. Background technique [0002] In the background of the field of automatic control, when we conduct scientific research, we usually analyze the model after linearization. However, this is not the case in the actual situation. It is not regarded as a constant in our commonly used frequency domain analysis. This leads to the fact that some physical parameters involved in the linearization model of the control object will change with the environment, especially with the temperature. When the working conditions change drastically, the traditional PI controller cannot meet the requirements of the dynamic performance of the system in some occasions due to its own limitations, and the sliding mode control can make up for this problem. Sliding mode control will make the system state move from any initial position, finally enter th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P27/08
CPCH02P21/0007H02P27/08
Inventor 刘景林官睿智陈颖康
Owner NORTHWESTERN POLYTECHNICAL UNIV