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Sliding-mode variable structure control method of variable exponential coefficient reaching law of permanent magnet synchronous motor

A permanent magnet synchronous motor, sliding mode variable structure technology, applied in the direction of motor control, motor generator control, AC motor control, etc., can solve the problems of poor dynamic performance, low robustness, etc., to reduce chattering, controller Optimize and increase the effect of approach speed

Inactive Publication Date: 2017-03-29
JIANGSU UNIV
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Problems solved by technology

[0006] In order to solve the disadvantages of poor dynamic performance and low robustness of the integral sliding mode variable structure control motor speed control system based on conventional reaching rate, a variable exponential sliding mode speed control method based on variable exponential coefficient reaching law is proposed.

Method used

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  • Sliding-mode variable structure control method of variable exponential coefficient reaching law of permanent magnet synchronous motor
  • Sliding-mode variable structure control method of variable exponential coefficient reaching law of permanent magnet synchronous motor
  • Sliding-mode variable structure control method of variable exponential coefficient reaching law of permanent magnet synchronous motor

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Embodiment Construction

[0040] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto:

[0041] Step 1: If figure 1The schematic diagram of the proposed PMSM control method is shown, and the three-phase AC current signal i in the a-b-c stationary coordinate system is collected by the current sensor a i b and i c . Through software programming, after Clark transformation Get the two-phase i in the stationary coordinate system α and i β . In order to facilitate the design of the control system, the i α and i β Further transformed by Park Get i in the rotating coordinate system d and i q .

[0042] Step 2: Combine the given speed and the speed measured by the photoelectric encoder to get the speed deviation ω through the subtractor * -omega.

[0043] Step 3: The speed deviation ω obtained in step 2 * -ω is used as the input of the variable expone...

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Abstract

The invention discloses a sliding-mode variable structure control method of a variable exponential coefficient reaching law of a permanent magnet synchronous motor. The method comprises the following steps: aiming at the requirements of a control system of a high-performance permanent magnet synchronous motor, a variable exponential function term formula is introduced on the basis of a conventional exponential reaching law; the formula takes a first-order norm of systematic state variables as an exponent of exponential functions, adaptively adjusts the reaching speed of a variable exponent term and a variable speed term according to the distance between the system and a sliding-mode surface, and is helpful to increase the dynamic response speed of the system; the systematic state variables are associated by taking the first-order norm of the systematic state variables as the exponent of the functions; and an s function is introduced to replace a symbolic function for further suppressing system chattering. Therefore, the sliding-mode variable structure control method of the permanent magnet synchronous motor using the variable exponential coefficient reaching law is provided. Compared with an integral-type sliding-mode variable structure control method, the method disclosed by the invention can be used for effectively increasing the dynamic characteristics and steady state characteristics of the system as well as increasing the robustness of the system.

Description

technical field [0001] The invention belongs to the application field of motor stability control, and relates to a control method of a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) has the advantages of simple structure, low loss, high power factor, and strong reliability, so it has a wide range of applications in many fields such as radar technology, electric vehicles, and aerospace. However, PMSM is a nonlinear, time-varying, and strongly coupled complex system. Motor parameter changes and external disturbances will greatly reduce the performance of traditional PI control. , anti-jamming ability and other requirements. [0003] Research results based on modern control theory, such as neural network control, fuzzy control, model reference adaptive control, sliding mode control, etc., have been gradually applied to AC servo systems to solve the problems caused by convention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/22H02P25/024H02P27/08
CPCH02P21/0007H02P25/024H02P27/08H02P2207/05
Inventor 李自成徐松刘国海许德志陈兆岭沈跃张宝山赵文祥朱孝勇吉敬华
Owner JIANGSU UNIV
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