Novel approaching law sliding mode control method for permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electronically commutated motor control, control system, etc., and can solve the problems that sliding mode approach speed and chattering suppression cannot be taken into account, and achieve small overshoot , good dynamic performance, and the effect of improving dynamic quality

Active Publication Date: 2019-08-16
ZHENGZHOU UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new approach law sliding mode control method for permanent magnet synchronous motors to solve the problem that the current speed control scheme of permanent magnet synchronous motors cannot take into account the sliding mode approach speed and chattering suppression

Method used

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  • Novel approaching law sliding mode control method for permanent magnet synchronous motor
  • Novel approaching law sliding mode control method for permanent magnet synchronous motor
  • Novel approaching law sliding mode control method for permanent magnet synchronous motor

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Experimental program
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Embodiment Construction

[0034] Such as figure 1 Shown is the control block diagram of the present embodiment, and the specific steps are:

[0035] Step 1: Detect the rotor position and current speed ω of the permanent magnet synchronous motor through the photoelectric encoder installed on the motor rotor, and set the motor speed given value ω * The motor speed ω measured by the photoelectric encoder is used to obtain the speed deviation ω through the subtractor * -omega.

[0036] Step 2: The speed outer loop adopts a sliding mode variable structure controller based on a new reaching law, and the speed deviation ω obtained in step 1 * -ω is input to the sliding mode variable structure controller, and the output is the given value of the q-axis current

[0037] Step 3: Collect the phase currents in the three-phase stationary abc coordinate system, and obtain the two-phase current i in the two-phase stationary αβ coordinate system through Clark transformation α and i β , then i α and i β The tw...

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Abstract

The invention relates to a novel approaching sliding mode control method for a permanent magnet synchronous motor, belonging to the field of motor control. The method comprises a step of inputting a speed deviation between a motor speed set value and a motor speed into a sliding mode variable structure controller and outputting a q-axis current set value, a step of collecting three-phase alternating current and obtaining d-axis current and q-axis current through coordinate system conversion, a step of obtaining d-axis voltage and q-axis voltage by conversion and regulating a three-phase inverter by a switching signal obtained by voltage space vector pulse width modulation, and a step of finally, controlling the motor by using the output amount of a three-phase inverter. The sliding mode variable structure controller designed based on the novel approaching law in the invention can improve the dynamic quality of a controlled system, the controller has faster response speed and smaller overshoot, and the robustness and rapidity of the system are improved.

Description

technical field [0001] The invention relates to a new approaching law sliding mode control method for a permanent magnet synchronous motor, which belongs to the field of motor control. Background technique [0002] Permanent magnet synchronous motor has the advantages of simple structure, high power density and high efficiency, and has been widely used in high-precision CNC machine tools, robots, aerospace and other fields. Since the permanent magnet synchronous motor is a complex control object with multiple variables, strong coupling, nonlinearity, and variable parameters, if conventional PID control is used, although it can meet the control requirements within a certain range of accuracy, it depends on the accuracy of the system model. It is easily affected by external disturbances and internal parameter changes, making the system control deviate from the expected goal. [0003] In order to solve the problems of conventional PID control, scholars at home and abroad have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/05H02P21/18
CPCH02P21/0007H02P21/05H02P21/18
Inventor 王要强冯玉涛秦明程志平王克文李明辉孙世伟马小勇
Owner ZHENGZHOU UNIV
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