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PMSM torque ripple comprehensive suppression method considering electrical loss under stator current vector orientation

A technology of stator current vector and torque ripple, applied in the field of electric motors

Active Publication Date: 2020-10-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Existing research on torque ripple often ignores the influence of electrical losses, but these two issues are often coupled with each other

Method used

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  • PMSM torque ripple comprehensive suppression method considering electrical loss under stator current vector orientation
  • PMSM torque ripple comprehensive suppression method considering electrical loss under stator current vector orientation
  • PMSM torque ripple comprehensive suppression method considering electrical loss under stator current vector orientation

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Embodiment Construction

[0042] The present invention is realized by the following technical solutions:

[0043] 1. Derivation of minimum loss constraints

[0044] PMSM losses mainly include iron loss, copper loss, and mechanical loss. The mechanical loss is mainly caused by bearing friction. Copper loss, while ignoring mechanical loss, establishes as attached Figure 1-2 The dq-axis equivalent circuit of the PMSM is shown.

[0045]

[0046] The electromagnetic torque equation can be written as:

[0047]

[0048] The total loss P of the PMSM system Loss for:

[0049]

[0050] When the PMSM system is in a steady state, the electromagnetic torque T e and speed ω r are constants, namely i wq is also a constant; at this time, the total loss P of the PMSM system Loss only with i wd related. Therefore, to find the optimal stator current when the loss is the smallest, only need to solve d-axis current active component i wdref .

[0051]

[0052] At this time, the d-axis current is e...

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Abstract

The invention relates to a permanent magnet synchronous motor (PMSM) torque ripple comprehensive suppression method considering electrical loss under stator current vector orientation. The control method comprises the following steps: deriving a stator current constraint condition of a PMSM under a minimum loss condition and an optimal stator harmonic current constraint condition for realizing torque ripple minimization; according to the constraint conditions, establishing a PMSM torque ripple comprehensive suppression method (short for a closed-loop I / f control method) considering electricalloss under stator current vector orientation by applying a backstepping control principle under a closed-loop I / f control framework. The invention also designs a PMSM speed identification algorithm based on a least square method so as to accurately acquire the speed signal. Test results show that under the proposed closed-loop I / f control method, each parameter of the motor can be quickly converged and reach a stable value, the operation loss of the motor is obviously reduced, and the torque ripple is effectively inhibited; and accurate tracking and identification can be achieved for the rotating speed under the low, medium and high conditions, and wide-range tracking of the PMSM is achieved.

Description

technical field [0001] The invention relates to a control method of a permanent magnet synchronous motor, belonging to the technical field of motors. Background technique [0002] With the rapid development of power electronics technology, new motor control theory and rare earth permanent magnet materials, permanent magnet synchronous motors (permanent magnet synchronous motor, PMSM) can be rapidly popularized and applied. However, due to the non-ideal design of the motor structure, the distortion of the air-gap magnetic field, and the nonlinearity of the inverter, the torque of the permanent magnet synchronous motor has a large pulsation, which limits the application of the permanent magnet synchronous motor in high-precision applications. . On the other hand, the current energy shortage problem is becoming more and more prominent, and the operational efficiency of PMSM is also receiving more and more attention. The operating efficiency of the motor mainly depends on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/22H02P21/05
CPCH02P21/14H02P21/22H02P21/05
Inventor 余洋从乐瑶田夏卢健斌谢仁杰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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