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MTPA curve fitting method for embedded permanent magnet synchronous motor and control system

A permanent magnet synchronous motor and curve fitting technology, which is applied in the control system, vector control system, motor generator control, etc., can solve the problem that the MTPA curve cannot take into account the calculation and accuracy requirements at the same time, and achieve high precision and simple calculation. Effect

Inactive Publication Date: 2018-04-10
CHENGDU RAJA NEW ENERGY AUTOMOTIVE TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Existing MTPA curve-fitting methods cannot balance computational and precision requirements well

Method used

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  • MTPA curve fitting method for embedded permanent magnet synchronous motor and control system
  • MTPA curve fitting method for embedded permanent magnet synchronous motor and control system
  • MTPA curve fitting method for embedded permanent magnet synchronous motor and control system

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Embodiment Construction

[0055] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0056] ⑴Develop the MTPA curve of the embedded permanent magnet synchronous motor

[0057] According to the no-load back electromotive force and speed measured by the experiment, the permanent magnet flux linkage of the motor rotor is obtained;

[0058] Control the IGBT to output AC and D-axis currents, and measure the experimental data of the motor's Q-axis inductance and Q-axis current, as well as the corresponding relationship between the D-axis inductance and the D-axis current;

[0059] According to the calculation formula of the torque and the quadrature axis current satisfying the MTPA condition, by giving the quadrature axis current, several torque values ​​at equal intervals are obtained, and the corresponding torque is obtained ac...

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Abstract

The invention discloses an MTPA curve fitting method for an embedded permanent magnet synchronous motor. The method includes the steps of solving a permanent magnet linkage of a motor rotor accordingto the motor zero-load counter electromotive force and a rotating speed measured through an experiment, controlling q-axis current and d-axis current, measuring the experimental data of the corresponding relation between the q-axis inductance and the q-axis current, and between the d-axis inductance and the d-axis current, obtaining plurality of equal-interval torque values according to the calculation formula of the torque and q-axis current meeting the MTPA condition and through giving the q-axis current, obtaining the d-axis current under the corresponding torque according to the q-axis current and d-axis current relation meeting the MTPA condition, and fitting a MTPA curve of the torque and q-axis current and d-axis current relation based on a plurality of obtained equal-interval torque values of zero-to-maximum torques. The method aims at solving the problems that a formula calculation method is not high in precision, the operation of an experiment test method is complicated. An embedded permanent magnet synchronous motor MTPA curve comprehensive drawing method and a control system which can meet calculation and precision requirements are provided.

Description

technical field [0001] The invention belongs to the technical field of motor control, and relates to a maximum torque current ratio (Maximum Torque Per Ampere, MTPA) curve fitting method of an embedded permanent magnet synchronous motor and an MTPA control system of the embedded permanent magnet synchronous motor. The problem to be solved by the present invention is to propose a MTPA curve fitting method and control system based on an interior permanent magnet synchronous motor (Interior Permanent Magnet Synchronous Motor, IPMSM), which is simple in calculation, high in precision, practical and reliable. Background technique [0002] In recent years, with the attention of all walks of life to environmental protection issues, the embedded permanent magnet synchronous motor with the characteristics of high efficiency, energy saving, practical reliability, and strong robustness has become a hot spot in all walks of life, especially in industrial intelligent robots. , new energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/06
CPCH02P21/06H02P21/14
Inventor 宋波贾雷徐浩王晓文
Owner CHENGDU RAJA NEW ENERGY AUTOMOTIVE TECH CO LTD
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