Permanent magnet motor position-less direct torque control method based on novel flux observer

A technology of direct torque control and flux linkage observer, applied in the field of new flux linkage observer, can solve the problem of inaccurate flux linkage estimation, and achieve the effect of suppressing high-frequency interference and improving stability

Active Publication Date: 2018-07-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional flux linkage estimation method is replaced by a new flux linkage observer, which solves the problem of inaccurate flux linkage estimation caused by the use of non-position control, and avoids the problems caused by the use of position sensors

Method used

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  • Permanent magnet motor position-less direct torque control method based on novel flux observer
  • Permanent magnet motor position-less direct torque control method based on novel flux observer
  • Permanent magnet motor position-less direct torque control method based on novel flux observer

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Embodiment Construction

[0065] The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings.

[0066] Step 1: Detection and calculation of current and voltage

[0067] Detect the three-phase current i of the permanent magnet motor a , i b , i c , and after 3s / 2s (Clarke) transformation, the current i in the two-phase stationary coordinate system is obtained α and i β . Detect the voltage of the DC power supply and the three-phase duty ratio, and transform it through 3s / 2s (Clarke) to obtain the voltage u in the two-phase static coordinate system α and u β . The calculation method is as follows,

[0068]

[0069]

[0070] where S a , S b , S c is the duty cycle of the controller output, U dc is the DC bus voltage value.

[0071] Step 2, observation of back EMF:

[0072] The voltage equation of the permanent magnet motor in the stationary coordinate system is:

[0073]

[0074] Where R is the internal r...

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Abstract

The invention discloses a permanent magnet motor position-less direct torque control method based on a novel flux observer. Based on a disturbance observer, a voltage model method is improved by a current model flux calculation method, and the novel flux observer is designed. The novel flux observer inputs voltage u alpha and u beta, current i alpha and i beta, permanent magnet flux linkage psi fand an estimated position angle theta under a static coordinate system, and outputs flux estimation values psi alpha and psi beta under a static coordinate system. The novel flux observer has high anti-interference capability, and a two-phase flux linkage can be accurately estimated under the interference conditions of high frequency and part of low frequency. According to the position-less directtorque control method based on the novel flux observer, position estimation errors caused by position-less property can be resisted, the robustness of a position-less system is improved, and stable running of a permanent magnet motor position-less sensor is ensured.

Description

technical field [0001] The invention relates to a novel flux observer, which is used for improving the stability of a permanent magnet motor under direct torque operation without position. It is suitable for rail transit, aerospace, electric vehicles, etc. that require direct torque to provide high dynamic response performance, but due to the high cost of the position sensor, inconvenient installation, or poor reliability, it is not suitable for the installation of the position sensor. It can also be used in other occasions that require high-precision flux linkage observations. Background technique [0002] The permanent magnet motor has the advantages of simple structure, high efficiency and wide range of applications. Permanent magnet motors require position feedback for effective control, however, the installation, maintenance and repair of position sensors will increase costs. In some special cases, it is not even allowed to install position sensors. Therefore, positi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/30H02P21/14
CPCH02P21/141H02P21/30
Inventor 赵文祥杨安晨矫帅沈跃朱纪洪
Owner JIANGSU UNIV
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