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Method for identifying parameters of permanent magnet synchronous motor based on second-order sliding mode observer

A technology of permanent magnet synchronous motor and second-order sliding mode, which is applied in the field of motor parameter identification, can solve problems such as identification distortion, and achieve the effects of suppressing chattering, high estimation accuracy, and fast convergence speed

Inactive Publication Date: 2019-12-10
山东深川变频科技股份有限公司
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  • Abstract
  • Description
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Problems solved by technology

And when the load disturbance changes in a large range in the transient process, the old load torque estimation value still participates in the recursive process, causing identification distortion

Method used

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  • Method for identifying parameters of permanent magnet synchronous motor based on second-order sliding mode observer
  • Method for identifying parameters of permanent magnet synchronous motor based on second-order sliding mode observer
  • Method for identifying parameters of permanent magnet synchronous motor based on second-order sliding mode observer

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Embodiment 1

[0044] Such as figure 1 As shown, the parameter identification method of the permanent magnet synchronous motor based on the second-order sliding mode observer of the present invention is as follows:

[0045] The first step is to obtain the parameters of the permanent magnet synchronous motor in the dq axis reference coordinate system, including the number of pole pairs P, and the voltage component u of the stator voltage on the d and q axes d , u q , the current component i of the stator current on the d and q axes d i q , the inductance component L of the stator inductance on the d and q axes d , L q , stator resistance R s , the component ψ of the flux linkage on the d and q axes d 、ψ q , motor angular velocity ω m ;

[0046] In the second step, taking the mechanical angular velocity and load torque as the observation objects, the extended sliding mode observer can be described as:

[0047]

[0048] In formula (1), J, T e , T L , F and ω m are the moment of ...

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Abstract

The invention relates to the technical field of motor parameter identification, and specifically relates to a method for identifying parameters of a permanent magnet synchronous motor based on a second-order sliding mode observer. The method comprises the steps of first, acquiring parameters of the permanent magnet synchronous motor under a dq-axis reference coordinate system; second, constructingan expandable sliding mode observer by taking the mechanical angular velocity and the load torque as observation objects; third, constructing a second-order sliding mode observer to identify the loadtorque of the permanent magnet synchronous motor by taking the mechanical angular velocity and the load torque as observation objects on the basis of the second step, and fourth, identifying the rotational inertia of the permanent magnet synchronous motor by adopting a direct calculation method or a PI regulator method on the basis of the identified load torque. According to the invention, changes of rotational inertia, the electromagnetic torque and the viscous friction are considered, and the buffeting can be effectively restrained while the precision of the load torque is guaranteed.

Description

technical field [0001] The invention relates to the technical field of motor parameter identification, in particular to a parameter identification method of a permanent magnet synchronous motor based on a second-order sliding mode observer. Background technique [0002] In recent decades, permanent magnet synchronous motor (PMSM) drives have been widely used in various electromechanical servo systems. The parameters of the drive system, such as load torque and moment of inertia, are of great significance to improve the design of controllers in industrial applications. For example, when the moment of inertia is used to design the speed loop controller, the drive system will have higher speed tracking accuracy. In addition, when the load torque is used as the feed-forward item of the reference torque, the anti-load disturbance capability of the drive system will be significantly improved. However, the load torque is generally unknown and the moment of inertia can vary signif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/00
CPCH02P21/0007H02P21/14
Inventor 叶益强陈礼根张玉北
Owner 山东深川变频科技股份有限公司
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