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Fault-tolerant-vector-control-based third harmonic current injection method of five-phase permanent-magnet motor

A permanent magnet motor and vector control technology, which is applied in the control of generators, vector control systems, and electromechanical brakes. It can solve the problems of current hysteresis controller switching frequency not fixed, increasing switching loss, electromagnetic interference, etc.

Active Publication Date: 2017-10-20
JIANGSU UNIV
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Problems solved by technology

The switching frequency of the current hysteresis controller is not fixed, which will increase the switching loss and also bring some electromagnetic interference

Method used

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  • Fault-tolerant-vector-control-based third harmonic current injection method of five-phase permanent-magnet motor
  • Fault-tolerant-vector-control-based third harmonic current injection method of five-phase permanent-magnet motor
  • Fault-tolerant-vector-control-based third harmonic current injection method of five-phase permanent-magnet motor

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Embodiment Construction

[0121] The technical solutions in the embodiments of the present invention will be described in detail and completely below in conjunction with the drawings in the embodiments of the present invention.

[0122] Step 1: According to the two principles that the sum of the fundamental magnetomotive force before and after the fault remains unchanged and that the α-β axis magnetomotive force after the fault can still form a flux linkage circle, deduce that the phase The corresponding reduced-order Clarke and Park transforms of the fundamental wave under adjacent two-phase open-circuit faults and non-adjacent two-phase open-circuit faults.

[0123] Single-phase open circuit: Take the open circuit fault of phase A as an example. When an open-circuit fault occurs in phase A, the derived reduced-order Clarke transform of the fundamental wave is:

[0124]

[0125] in, is the fundamental wave reduced-order Clarke transformation matrix under the open-circuit fault of phase A; δ is t...

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Abstract

The invention discloses a fault-tolerant-vector-control-based third harmonic current injection method of a five-phase permanent-magnet motor. The method comprises: a fundamental wave decoupling model under various open-circuit faults of a five-phase permanent-magnet motor is established and a corresponding fundamental fault-tolerant current is deduced; according to a magnetic resonance method, a torque mathematical model under the fundamental fault-tolerant current is established; on the basis of the established torque model, an expression of third harmonic current injection under various open-circuit faults is deduced; on the basis of a superposition principle, the fundamental current is added to the third harmonic current to obtain a total fault-tolerant current; and with corresponding deflation clark and park transform, a current component under a rotation orthogonal coordinate system is obtained, so that third harmonic current injection under magnetic field orientation control and fault-tolerant vector control under faults is realized. Therefore, on-line calculation of the third harmonic current under fault-tolerant vector control and injection of the third harmonic current at a fixed switching frequency are realized; the torque ripple is suppressed and the system robustness is enhanced; and the switching loss and the electromagnetic interference are reduced.

Description

technical field [0001] The invention relates to the technical field of fault-tolerant control of multi-phase motors, in particular to a third harmonic current injection method for five-phase permanent magnet motors based on fault-tolerant vector control. It is suitable for occasions that have high requirements on the reliability of motors, such as aerospace, electric vehicles, and ship propulsion systems. Background technique [0002] Compared with traditional three-phase motors, multi-phase motors have a higher degree of control freedom and thus better fault tolerance. It has received more and more attention and research in fields requiring high reliability operation such as electric vehicles, ship propulsion, and aerospace. [0003] In recent years, universities and scientific research institutions at home and abroad have also carried out in-depth research on the fault-tolerant control strategy of five-phase permanent magnet motors, and achieved certain results. On the b...

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Application Information

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IPC IPC(8): H02P29/028H02P21/00
Inventor 刘国海林志鹏陈前赵文祥吉敬华徐高红
Owner JIANGSU UNIV
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