Method for analyzing magnetic potential of non-sine power supply multiphase motor

An analysis method and technology for multi-phase motors, which are applied in motor generator control, electronically commutated motor control, and control generators, etc., can solve problems such as the inability to provide a simple and unified calculation process, and the change of air gap magnetic potential.

Active Publication Date: 2014-02-05
NAVAL UNIV OF ENG PLA
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Problems solved by technology

Especially when a non-sinusoidal power supply multi-phase motor has a phase loss fault, the air gap magnetic potential will change with the fault situation. The existing magnetic po

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  • Method for analyzing magnetic potential of non-sine power supply multiphase motor
  • Method for analyzing magnetic potential of non-sine power supply multiphase motor
  • Method for analyzing magnetic potential of non-sine power supply multiphase motor

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0041] Taking a five-phase induction motor with non-sinusoidal power supply as an example, the application process of the invented equivalent sequence current method to calculate the magnetic potential in the normal operation and fault conditions of the motor is explained in detail. The windings of the motor are different from each other by 2π / 5 electrical angles, and the midpoints of the five-p...

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Abstract

The invention belongs to the technical field of motor analysis design, and discloses a method for analyzing magnetic potential of a non-sine power supply multiphase motor. The method includes the steps that the concepts of equivalent positive sequence currents and equivalent inverted sequence currents are imported, a synthetic forward circular rotating field and a synthetic inverted circular rotating field are seen as being generated by the equivalent positive sequence currents and the equivalent inverted sequence currents respectively, subharmonic currents are indicated as current phasors in an index mode, on the basis of magnetic potential equivalence, harmonic equivalent sequence currents corresponding to the subharmonic magnetic potential are acquired, and then corresponding space harmonic forward magnetic potential and inverted magnetic potential are directly solved. The method is based on the electro mechanics fundamental principles, the concept is clear, complex calculation of superposing the subharmonic magnetic potential of all phases in a traditional method is avoided, the method is suitable for analyzing the magnetic potentials of the multiphase motor under multiple working conditions, and when default phases or asymmetrical windings or asymmetrical currents or other failures occur, only corresponding elements in a current matrix or a winding spatial position matrix need to be changed.

Description

technical field [0001] The invention belongs to the technical field of motor analysis and design, and more specifically relates to a magnetic potential analysis method of a multi-phase motor with non-sinusoidal power supply. Background technique [0002] Multiphase motors have many advantages such as high reliability, high power density and high torque density, and have become the focus of research on electric propulsion motors at home and abroad. In order to overcome the shortcoming that the iron core is not fully utilized in the sinusoidal power supply motor, the stator of the multi-phase motor can use full-pitch concentrated windings and be powered by a non-sinusoidal power supply, so that the harmonic magnetic potential can be utilized and the utilization rate of the motor iron core can be improved. and torque density. In multiphase motors injected with harmonic currents, the analysis of the air-gap magnetic field is the basis for the effective use of harmonic magnetic ...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 王东吴新振陈俊全郑晓钦
Owner NAVAL UNIV OF ENG PLA
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