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Permanent magnet synchronous motor d-axis and q-axis induction parameter on-line identification method and system

A permanent magnet synchronous motor, direct-axis inductance technology, applied in control systems, control generators, vector control systems, etc., can solve problems such as large amount of calculation

Active Publication Date: 2015-08-12
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology

[0003] Based on this, it is necessary to provide an online identification method and system for AC and D-axis inductance parameters of permanent magnet synchronous motors in view of the large amount of calculation in the existing online identification method of permanent magnet synchronous motor parameters based on the least square method

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  • Permanent magnet synchronous motor d-axis and q-axis induction parameter on-line identification method and system
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  • Permanent magnet synchronous motor d-axis and q-axis induction parameter on-line identification method and system

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[0040] In order to make the technical solution of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] see figure 1 , an online identification method for AC and D-axis inductance parameters of permanent magnet synchronous motors, comprising the following steps:

[0042] S100, sample the direct-axis voltage u of the permanent magnet synchronous motor in the dq coordinate system d , cross-axis voltage u q , direct axis current i d , and the quadrature current i q ;

[0043] S200, according to the direct axis voltage u d , cross-axis voltage u q , direct axis current i d , and the quadrature current i q , for the back EMF coefficient and the phase resistance R of the permanent magnet synchronous motor s Taking a constant, reducing the order of the least square method, and calculating the quadrature axis inductance parameter L of the permanent magnet ...

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Abstract

The invention discloses a permanent magnet synchronous motor d-axis and q-axis induction parameter on-line identification method and a system. The method comprises sampling a d-axis voltage u<d), a q-axis voltage u<q>, a d-axis current i<d> and a q-axis current i<q> of a permanent magnet synchronous motor in a dq coordinate system; and, according to the d-axis voltage u<d), the q-axis voltage u<q>, the d-axis current i<d> and the q-axis current i<q>, regarding the back electromotive force efficient and a phase resistance R<s> of the permanent magnet synchronous motor as constants, performing order reduction processing on a least square method, and calculating to obtain a q-axis induction parameter L<q> of the permanent magnet synchronous motor and a d-axis induction parameter L<d> of the permanent magnet synchronous motor. According to the d-axis voltage u<d), the q-axis voltage u<q>, the d-axis current i<d>, the q-axis current i<q> and an order reduction calculation model based on the least square method, the q-axis induction parameter L<q> and the d-axis induction parameter L<d> of the permanent magnet synchronous motor are calculated, and then the problem of the large calculated amount in an existing method for achieving permanent magnet synchronous motor parameter on-line identification based on the least square method is effectively solved.

Description

technical field [0001] The invention relates to the field of motors, in particular to an online identification method and system for AC and D-axis inductance parameters of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) is widely used in CNC machine tools, electronic and electrical fields due to its simple structure, reliable operation, small size, low loss and high efficiency. The parameters of permanent magnet synchronous motor have an important influence on its application. Usually, when the permanent magnet synchronous motor is running, the inductance parameter changes greatly, and an appropriate online identification method for the permanent magnet synchronous motor parameters is very important for a high-precision permanent magnet synchronous motor control system. The least squares method proposed by Gauss when predicting the trajectory of celestial bodies has a simple ca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 张有林郭清风米雪涛钱强
Owner GREE ELECTRIC APPLIANCES INC
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