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Inductance determination method and device for permanent-magnet synchronous motor

A technology for permanent magnet synchronous motors and determination methods, which is applied in the direction of controlling electromechanical transmissions, controlling generators, motor generators, etc., and can solve problems such as poor detection accuracy

Active Publication Date: 2014-11-19
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a method and device for determining the inductance of a permanent magnet synchronous motor, so as to at least solve the problem of poor detection accuracy caused by uncontrollable factors and cross saturation between the orthogonal and direct axis magnetic circuits in the process of measuring the inductance of the AC and D axes , can more accurately measure the AC-D axis inductance and improve the detection accuracy

Method used

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  • Inductance determination method and device for permanent-magnet synchronous motor
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  • Inductance determination method and device for permanent-magnet synchronous motor

Examples

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Embodiment 1

[0094] An embodiment of the present invention provides a method for determining the inductance of a permanent magnet synchronous motor, specifically as figure 1 shown, including:

[0095] S101. The device for determining the inductance of the permanent magnet synchronous motor obtains a first rotational speed at which the motor dynamometer controls the operation of the motor under test. The motor under test is a permanent magnet synchronous motor, and the first rotational speed is within a preset first threshold range.

[0096] It should be noted that, in the embodiment of the present invention, the left end point of the first threshold range should be set higher for the following reasons:

[0097] According to the voltage equation of permanent magnet synchronous motor shown in formula (1) and formula (2), when the measured motor speed ω is as high as possible, the last item in formula (1) and formula (2) is much greater than the other Two items, and then the other two items ...

Embodiment 2

[0131] An embodiment of the present invention provides a method for determining the inductance of a permanent magnet synchronous motor, specifically as figure 2 shown, including:

[0132] S201. The device for determining the inductance of the permanent magnet synchronous motor acquires a first rotational speed at which the motor dynamometer controls the operation of the motor under test. The motor under test is a permanent magnet synchronous motor, and the first rotational speed is within a preset first threshold range.

[0133] It should be noted that, in the embodiment of the present invention, the left end point of the first threshold range should be set higher, and the specific reason may refer to the description of Embodiment 1, which will not be repeated in the embodiment of the present invention.

[0134] In order to ensure the normal operation of the motor under test, the speed of the motor under test should not be greater than the preset base speed of the motor under...

Embodiment 3

[0159] An embodiment of the present invention provides a method for determining the inductance of a permanent magnet synchronous motor, specifically as image 3 shown, including:

[0160] S301. The device for determining the inductance of the permanent magnet synchronous motor acquires a first rotational speed at which the motor dynamometer controls the operation of the motor under test. The motor under test is a permanent magnet synchronous motor, and the first rotational speed is within a preset first threshold range.

[0161]It should be noted that, in the embodiment of the present invention, the left end point of the first threshold range should be set higher, and the specific reason may refer to the description of Embodiment 1, which will not be repeated in the embodiment of the present invention.

[0162] In order to ensure the normal operation of the motor under test, the speed of the motor under test should not be greater than the preset base speed of the motor under t...

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Abstract

The embodiment of the invention provides an inductance determination method and device for a permanent-magnet synchronous motor, which can measure the q-axis inductance and the d-axis inductance more accurately and improve the detection precision. The method comprises the following steps: obtaining the first rotating speed of the measured motor, which is controlled by a motor dynamometer to run; in the first rotating speed state, obtaining a first d-axis current, wherein the first d-axis current is the d-axis current obtained through the measurement when a motor controller controls the q-axis current of the measured motor to be zero, and the line voltage of the measured motor to be the first voltage; obtaining a second rotating speed; in the second rotating speed state, obtaining the second d-axis current, wherein the second d-axis current is the d-axis current obtained through measurement when the motor controller controls the q-axis current of the measured motor to be zero, and the line voltage of the measured motor to be the first voltage; according to the first rotating speed, the first d-axis current, the second rotating speed and the second d-axis current, calculating the first d-axis inductance of the measured motor; according to the first d-axis inductance, calculating the first q-axis inductance of the measured motor. The inductance determination method and device, provided the invention, can be applicable to the technical field of detection.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method and device for determining the inductance of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor has the advantages of simple structure, small size, high efficiency, high power factor, low moment of inertia, etc., and has been widely used in industrial and agricultural production. The driving device of the permanent magnet synchronous motor mainly uses the method of vector control or direct torque control to control the motor, and the parameters such as the AC-D axis inductance of the motor have a great influence on the control performance of these two control methods. Therefore, it is of great significance to accurately measure the AC-D axis inductance of the motor to improve the control performance of the motor. [0003] At present, the test methods used to measure the AC-D axis inductance of permanent magnet synchr...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 李松董欣然韩锋程立品高泽霖刘秀
Owner GREAT WALL MOTOR CO LTD
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