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Multi-phase single-winding alternative-pole permanent-magnet bearingless motor

A bearingless motor, alternating pole technology, used in electrical components, holding devices with magnetic attraction or thrust, etc., to achieve high reliability, easy wiring, and fault-tolerant operation.

Inactive Publication Date: 2011-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, no alternating pole permanent magnet bearingless motor with multi-phase single winding structure has been reported.

Method used

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  • Multi-phase single-winding alternative-pole permanent-magnet bearingless motor
  • Multi-phase single-winding alternative-pole permanent-magnet bearingless motor
  • Multi-phase single-winding alternative-pole permanent-magnet bearingless motor

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Embodiment

[0025] A nine-phase single-winding alternating pole permanent magnet type bearingless motor, the stator adopts a set of nine-phase windings, and the adjacent phase difference is 2π / 9 electrical angle; the number of pole pairs in the torque plane is 4, and when this structure is adopted, it is suspended The current counter-rotates the magnetic field (corresponding to the 8th harmonic) without additional levitation force.

[0026] In order to ensure the fundamental wave and 4th harmonic amplitude of the motor winding function and improve the torque performance of the motor, the following figure 2 The winding structure of the nine-phase single-winding alternating pole bearingless motor shown in 3-1-1-1. figure 2 Represents the winding function of a phase winding. This structure is no longer symmetrical about space, and contains odd and even space harmonics.

[0027] At this time, it is necessary to ensure that the winding function The second (fifth) space harmonic is close t...

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Abstract

This invention discloses a multi-phase single-winding alternative-pole permanent-magnet bearingless motor, which comprises a stator iron core, a rotor iron core, a rotor rotating shaft, rotor permanent magnets and multi-phase windings; a set of multi-phase windings is arranged in the stator iron core; the rotor permanent magnets are arranged in same polarity direction; the rotor iron core between the rotor permanent magnets is polarized alternatively to be with the same polarity. The invention provides a set of design scheme for the multi-phase single-winding alternative-pole permanent-magnet bearingless motor by deeply analyzing the magnetic suspension principle of the alternative-pole bearingless permanent-magnet motor and analyzing the influence of torque current and suspended current reversed magnetic field in the multi-phase motor on suspension force. The invention adopts a set of multi-phase motor windings and a set of multi-phase frequency converters to realize the bearingless operation of the system; the structure synchronously contains the advantages of the multi-phase single-winding structure and the alternative-pole permanent-magnet bearingless motor, thus the coupling degree of the suspension control and the torque control is greatly reduced, and the windings are of simple structure, the high-power transmission is easy to realize and the reliability is higher.

Description

Technical field [0001] The invention relates to a multi-phase single winding alternating pole permanent magnet type bearingless motor, which is suitable for high-speed and high-power bearingless AC transmission systems and is a magnetic levitation motor using bearingless technology. Background technique [0002] The permanent magnet alternating pole bearingless motor is a new type of bearingless motor. Its rotor structure adopts the form of alternating distribution of magnetic steel and silicon steel sheets. Its biggest feature is to achieve complete decoupling of torque performance and suspension performance, and control is easier. Ordinary bearingless motors are simple and require no rotor position signal for suspension control. They have received widespread attention from the academic community in recent years. [0003] Current alternating pole permanent magnet bearingless motors all use two sets of three-phase windings with different numbers of pole pairs. In high-power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N15/00
Inventor 黄进姜海博康敏袁宝成李炳楠
Owner ZHEJIANG UNIV
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