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Permanent magnet synchronous motor inductance parameter online identification method based on virtual shafting injection

A technology of permanent magnet synchronous motor and inductance parameters, which is applied in the control of generators, motor generators, and electromechanical brakes. The effect of robustness

Active Publication Date: 2022-07-22
HARBIN INST OF TECH
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Problems solved by technology

[0005] Aiming at the problem that the identification accuracy of the existing motor inductance identification method based on the dq-axis voltage equation is easily affected by the rotor position error, the present invention provides a method based on virtual axis system injection Online Identification Method of Inductance Parameters of Permanent Magnet Synchronous Motor

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  • Permanent magnet synchronous motor inductance parameter online identification method based on virtual shafting injection
  • Permanent magnet synchronous motor inductance parameter online identification method based on virtual shafting injection
  • Permanent magnet synchronous motor inductance parameter online identification method based on virtual shafting injection

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specific Embodiment approach 1

[0068] Specific implementation mode 1. Combination figure 1 and figure 2 As shown, the present invention provides an online identification method for permanent magnet synchronous motor inductance parameters based on virtual shaft system injection, including:

[0069] Step 1: Construct the motor virtual shaft system γδ, so that the motor virtual shaft system γδ and the motor dq shaft system rotate at different rotational angular frequencies, and the difference between the two rotational angular frequencies is a constant value; The relationship between the axes is as figure 1 shown. Therefore, during the operation of the motor, the virtual shaft system γδ sweeps the motor dq shaft system at the relative speed with the difference of the rotational angular frequency; in order to make the virtual shaft system γδ axis have the same mathematical properties under different speed conditions of the motor, it is necessary to ensure that γδ There is a constant relative rotation speed ...

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Abstract

The invention discloses a permanent magnet synchronous motor inductance parameter online identification method based on virtual shafting injection, and belongs to the technical field of permanent magnet synchronous motor inductance identification. The problem that the identification precision of an existing motor inductance identification method based on a dq-axis voltage equation is easily influenced by rotor position errors is solved. Comprising the steps that a motor virtual shaft system gamma delta is constructed, the motor virtual shaft system gamma delta and a motor dq shaft system are made to rotate at different rotation angular frequencies, and the difference value of the rotation angular frequencies of the motor virtual shaft system gamma delta and the motor dq shaft system is a constant value; setting a to-be-injected high-frequency sinusoidal voltage signal of the virtual shafting gamma delta; calculating an injection instruction of a to-be-injected high-frequency voltage signal under a motor dq shaft system; calculating an inductance parameter of a gamma axis under an online working condition; according to the function relation between the inductance parameter of the gamma axis and the motor position theta e under the online working condition, after the gamma axis rotates relative to the dq axis of the motor for one period, the inductance parameter extreme value of the gamma axis under the online working condition is extracted, and the corresponding dq axis inductance is obtained. According to the method, the accuracy and robustness in the parameter identification process are improved.

Description

technical field [0001] The invention relates to an online identification method for inductance parameters of a permanent magnet synchronous motor based on virtual shaft system injection, and belongs to the technical field of permanent magnet synchronous motor inductance identification. Background technique [0002] Permanent magnet synchronous motors are widely used in the industry due to their high torque density and high power density, including electric vehicles and servo systems. In the general control strategy of PMSM, the dual closed-loop system controller design of the motor and the various control methods of the motor usually rely on accurate inductance parameters. However, the motor inductance is not constant under different operating conditions, which affects the motor control effect. At present, the inductance identification methods are mainly divided into online identification and offline identification. Because the existing offline identification strategies mos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/18H02P25/022H02P6/18
CPCH02P21/14H02P21/18H02P25/022H02P6/183H02P2203/11H02P2207/05
Inventor 王奇维王高林丁大尉张国强刘少博徐殿国
Owner HARBIN INST OF TECH
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