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A Control Method of Permanent Magnet Synchronous Motor Based on Nonlinear Sliding Mode Surface

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve problems such as non-linear sliding mode surface chattering, unresolved theoretical problems, etc., and achieve reduction System buffeting frequency, improving system robustness, and good application prospects

Inactive Publication Date: 2020-03-20
NINGBO UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

At present, the chattering problem mainly exists in the nonlinear sliding mode surface, which is still in the stage of theoretical exploration, and there are still some theoretical problems unresolved

Method used

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  • A Control Method of Permanent Magnet Synchronous Motor Based on Nonlinear Sliding Mode Surface
  • A Control Method of Permanent Magnet Synchronous Motor Based on Nonlinear Sliding Mode Surface
  • A Control Method of Permanent Magnet Synchronous Motor Based on Nonlinear Sliding Mode Surface

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Embodiment Construction

[0022] The following describes the implementation of the present invention through specific specific examples, and those skilled in the art can easily implement the content disclosed in this specification.

[0023] The state equation of permanent magnet synchronous motor is as follows:

[0024]

[0025] among them b(x,t)=B p =K t / J, (n=2), i=1,2...n-1, J is the moment of inertia, B is the coefficient of viscous friction, K t Is the product of the inductance and the number of pole pairs, Is the system uncertainty item, d(x,t)=D p T L +T α For external interference, D p =-1 / J, and d(x,t)≤D max ,Δf(x,t)≤F max , Assuming Assuming that the reference output is

[0026] Define the error vector as:

[0027]

[0028] The sliding surface equation is designed as:

[0029] S(X,t)=CE-CP(t)

[0030] Where C=[c 1 c 2 …C n ], c i (i=1,2...n) is a normal number p(t) is the Terminal function. p(t) can be expressed as

[0031]

[0032] Define the Lyapunov function to prove the stability of the syste...

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Abstract

The invention provides a nonlinear sliding mode surface-based permanent magnet synchronous motor control method. The method comprises the steps of firstly establishing a permanent magnet synchronous motor state equation, next, designing a nonlinear sliding mode surface and a control law, then verifying system stability by a Lyapunov function, and finally, determining system parameters through a simulation result. The designed control law comprises a hysteresis oscillation damping function; compared with the commonly used sign function, the number of times of switching is lower, so that switchswitching frequency in the control process is lowered, thereby lowering system buffeting frequency and buffeting amplitude; the hysteresis oscillation damping function is a continuous and derivable function, so that nonlinearity of the control law in switching is ensured, and sliding mode control buffeting is weakened; and the method effectively overcomes defects in the prior art and has a high application value.

Description

Technical field [0001] The invention relates to a permanent magnet synchronous motor control method based on a nonlinear sliding mode surface. Background technique [0002] Permanent magnet synchronous motor (PMSM) has very good low-speed performance, can achieve high-speed control of field weakening, wide speed range, high dynamic characteristics and efficiency, and does not require excitation current, which improves the efficiency and power density of the motor. Permanent magnet synchronous Motors have become the mainstream choice for servo systems and are widely used in fields such as CNC machine tools and industrial robots. [0003] With the development of microelectronics, microprocessors, and control technologies, many control strategies with complex algorithms can be applied to motor control. Scholars at home and abroad have studied the sliding mode control strategy of the AC servo system more and have achieved certain results, but there are still many theoretical problems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/05H02P21/00
CPCH02P21/0007H02P21/05
Inventor 何金保骆再飞易新华
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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