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A sliding mode control strategy for permanent magnet synchronous motor based on reaching law

A permanent magnet synchronous motor and control strategy technology, applied in motor generator control, electronic commutation motor control, control system, etc. Realize the effect of high-precision vector control

Active Publication Date: 2017-06-30
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used method is the sliding mode control based on the reaching law, but the conventional approaching law, such as the exponential approaching law, the constant velocity approaching law, etc., weakens the chattering to a certain extent, but the chattering still exists and affects the control. system performance

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  • A sliding mode control strategy for permanent magnet synchronous motor based on reaching law
  • A sliding mode control strategy for permanent magnet synchronous motor based on reaching law
  • A sliding mode control strategy for permanent magnet synchronous motor based on reaching law

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] The control system block diagram of the present invention is as figure 1 Shown is the speed, current double closed-loop control system. The control system is composed of permanent magnet synchronous motor, speed position sensor, power conversion circuit, voltage space vector modulation (SVPWM), current PI regulator, sliding mode speed regulator, CLARKE transformation, PARK transformation and inverse transformation. Among them, the three-phase stator current i a ,i b ,i c It is measured by the current sensor, and then transformed by CLARKE and PARK to obtain the d and q axis current i in the rotating coordinate system d and i q ; Speed ​​and position sensors provide real-time speed ω for the system r and the position signal θ; the system uses The vector control of which is related to the measured d-axis current i d The input of the d-axis PI current regu...

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Abstract

The invention discloses a permanent magnet synchronous motor sliding-mode control strategy based on a novel reaching law. The permanent magnet synchronous motor control strategy adopts speed and current double-closed-loop control, a current loop adopts a PI (proportional-integral) controller, and a rotating speed loop adopts sliding-mode control based on the novel reaching law; a speed regulator adopts a novel speed change reaching law containing speed errors and sliding-mode surface information, deviation of a set rotor angular speed and a feedback rotor angular speed is used as the input quantity, and a q-axis current set value iq<*> is output through the sliding-mode control quantity. With the adoption of the strategy, the problems that a traditional reaching law is slow and large in steady-state buffeting are solved, the set rotating speed can be tracked quickly in a dynamic state, speed overshoot and current fluctuation are reduced, the harmonic content, produced by high-frequency buffeting, of a system can be decreased in a steady state, the performance of the system is greatly improved, and high-precision vector control on the permanent magnet synchronous motor speed regulating system is realized.

Description

technical field [0001] The invention relates to a sliding mode control strategy of a permanent magnet synchronous motor based on reaching law, which belongs to the motor technology. Background technique [0002] Permanent magnet synchronous motor has the characteristics of simple structure, small size, high operating efficiency, high power factor, small moment of inertia, etc. It is widely used in aerospace, CNC machine tools, electric vehicles and other fields. Traditional linear controllers, such as PI controllers, have simple algorithms, are easy to adjust, and can meet control requirements within a certain range. However, permanent magnet synchronous motors are complex systems with nonlinear, multivariable, strong coupling, and variable parameters. PI The performance of the controller is easily affected by system parameter changes and external disturbances, which will reduce the reliability of system operation and the dynamic and static performance. Sliding mode variabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00
Inventor 樊英周晓飞
Owner SOUTHEAST UNIV
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