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A control method and device for a permanent magnet synchronous motor based on a sliding mode variable structure

A permanent magnet synchronous motor and sliding mode variable structure technology, which can be used in motor generator control, AC motor control, control of electromechanical transmission devices, etc., and can solve problems such as chattering.

Active Publication Date: 2018-08-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the actual control process of the sliding mode variable structure method, due to the influence of factors such as time delay and inertia of the switching device, after the state of the system reaches the sliding mode surface, it does not keep sliding on the sliding mode surface. The sliding mode surface moves back and forth and even produces limit cycle oscillation. This phenomenon is the chattering phenomenon inherent in the sliding mode variable structure control system.

Method used

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  • A control method and device for a permanent magnet synchronous motor based on a sliding mode variable structure
  • A control method and device for a permanent magnet synchronous motor based on a sliding mode variable structure
  • A control method and device for a permanent magnet synchronous motor based on a sliding mode variable structure

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Embodiment 1

[0055] Embodiment 1 of the present invention provides a control method of permanent magnet synchronous motor based on sliding mode variable structure, as shown in the attached figure 1 Shown is a flow chart of a control method for a permanent magnet synchronous motor based on a sliding mode variable structure disclosed in Embodiment 1 of the present invention. The control method includes:

[0056] S101: Based on the pre-acquired variable exponential reaching law, s'=-ε*fal(s,α,δ) / s 2 - ks sliding mode variable structure, the torque equation of the permanent magnet synchronous motor under the rotating coordinate system and the motion equation of the permanent magnet synchronous motor are calculated to obtain the first reference current i of the stator q * ;

[0057] In S101, the torque equation of the permanent magnet synchronous motor is:

[0058]

[0059] The equation of motion of the permanent magnet synchronous motor is:

[0060]

[0061] In the process of executi...

Embodiment 2

[0081] Based on the control method of the permanent magnet synchronous motor based on the sliding mode variable structure disclosed in the first embodiment of the present invention, the second embodiment of the present invention specifically discloses that the variable exponent reaching law is obtained in advance in S101 as s'=-ε* fal(s,α,δ) / s 2 - The specific acquisition process of the sliding mode variable structure of ks, the specific acquisition process is as attached figure 2 shown, including:

[0082] S201: Calculate the angular velocity ω of the rotor according to the angular displacement θ of the rotor within the sampling period e ;

[0083] S202: Using the input reference angular velocity ω * and the rotor angular velocity ω e The difference e=ω * -ω e Construct the sliding mode function;

[0084] In S202, the sliding mode function is:

[0085] s=c∫e+e (6)

[0086] Among them, c is the sliding surface parameter, c>0;

[0087] S203: Construct a variable expo...

Embodiment 3

[0099] Embodiment 3 of the present invention provides a control device for a permanent magnet synchronous motor based on a sliding mode variable structure, as shown in the attached image 3 Shown is a schematic diagram of a control device for a permanent magnet synchronous motor based on sliding mode variable structure provided by Embodiment 3 of the present invention, including: a first reference current determination module 101, a first difference calculation module 102, a second difference Calculation module 103, first proportional and integral adjustment module 104, second proportional and integral adjustment module 105, Parker inverse transformation module 106, control module 107;

[0100] The first reference current determines the modulus 101, which is used based on the pre-acquired variable exponential reaching law as s'=-ε*fal(s,α,δ) / s 2 - ks sliding mode variable structure, the torque equation of the permanent magnet synchronous motor under the rotating coordinate sys...

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Abstract

The invention discloses a permanent magnet synchronous motor control method and a device based on a sliding mode variable structure. The method comprises steps: based on the sliding mode variable structure with a pre-acquired variable exponent reaching law s'=-epsilon*fal(s, alpha, delta) / s<2>-ks, a torque equation and a motion equation of the permanent magnet synchronous motor are used for calculation to obtain a first reference current; a first difference between the first reference current and a first current of the permanent magnet synchronous motor is calculated, and a second difference between a pre-inputted second reference current and a second current of the permanent magnet synchronous motor is calculated; proportional and integral regulation is carried out based on the first difference and the second difference respectively, and a first voltage component and a second voltage component are obtained; Park inverse transformation is carried out on the first voltage component and the second voltage component based on rotor angular displacement, and a first voltage and a second voltage are obtained; and space vector pulse width modulation is carried out on the first voltage and the second voltage to obtain pulse width signals, three-phase current is generated according to the pulse width signals to control operation of the permanent magnet synchronous motor, and the purposes of improving a buffeting phenomenon and solving brought problems are realized.

Description

technical field [0001] The invention relates to the technical field of motor control, and more specifically, to a control method and device for a permanent magnet synchronous motor based on a sliding mode variable structure. Background technique [0002] The permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) has the advantages of small size, simple structure and high efficiency, so it is widely used in AC servo systems. The AC servo system has high requirements on system performance. When affected by factors such as internal parameters or external disturbances, conventional proportional adjustment and integral adjustment (Proportional Integral control, PI control) methods cannot meet the control requirements of the AC servo system. Therefore, the sliding mode variable structure control method is usually used to meet the control requirements of the AC servo system. [0003] However, in the actual control process of the sliding mode variable structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/05H02P27/12
CPCH02P21/0007H02P21/05H02P27/12
Inventor 刘丰谷爱昱罗志伟
Owner GUANGDONG UNIV OF TECH