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Three degrees of freedom AC mixing magnetic bearing

A hybrid magnetic bearing and degree of freedom technology, applied in the field of electric transmission control equipment and electric transmission equipment, can solve the problems of difficult to improve control performance, large loss, complex control, etc., to improve passive suspension ability, simple control, and reduce the number of land Effect

Inactive Publication Date: 2007-09-19
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both the axial and radial directions need to be controlled at the same time. Due to the existence of DC excitation in the excitation control, the control is more complicated, the control performance is difficult to improve, and the loss is relatively large.

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Embodiment Construction

[0013] Figure 1 is a three-dimensional structural schematic diagram of the three-free AC hybrid magnetic bearing of the present invention. The stator in the figure is divided into two parts, axial and radial, which are made of laminated silicon steel sheets. The radial direction is a three-pole structure with three excitations. The winding, the rotor sheet end and the axial stator part are respectively added with two aluminum sheets inside and outside to improve the mechanical strength of the sheet axial stator and effectively reduce the magnetic flux leakage; Improve the mechanical strength of the thin section of the axial rotor, reduce magnetic flux leakage, and further reduce the aspect ratio of the thin section, and improve the passive suspension capability.

[0014] Its working principle is shown in Figure 2. In Figure 2(a), the rotor is at flux Φ a 、Φ b and Φ c Under the action, it is in a balanced position. If the rotor is biased to the positive direction of x by the...

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Abstract

The invention belongs to electrical transmission equipment field, particularly a new type three degrees of freedom alternating current hybrid magnetic bearing. An annular permanent magnet is employed to provide axial and radial static offset magnetic flux simultaneously. The three degrees of freedom alternating current hybrid magnetic bearing is consisted of a rotation shaft, rotor outboard aluminum sheet, rotor inboard aluminum sheet, axial stator outboard aluminum sheet, axial stator inboard aluminum sheet, annular permanent magnet, thin-sheet shaped axial stator, radial stator, radial winding and a rotor with a thin-sheet shaped end. One end of the rotor is a thin-sheet shaped structure used as an axial bearing, the rotor outboard aluminum sheet and the rotor inboard aluminum sheet are used to increase strength and fatherly reduce length-diameter ratio. Tripolar structure AC excitation is employed in radial direction, which provides control current by employing a triphase inverter. Aluminum sheets are used to increase strength and reduce length-diameter ratio in the invention, passive suspension is realized based on lamellate electric motor principle, which improves passive suspension ability. Axial spacing dimension occupied by the magnetic bearing is greatly reduced for that no excitation winding is needed.

Description

technical field [0001] The invention belongs to the field of electric transmission (mechanical transmission) equipment, in particular to a novel three-degree-of-freedom AC hybrid magnetic bearing, which is suitable for three-degree-of-freedom suspension supports of various rotating machines, and belongs to the technical field of electric transmission control equipment. Background technique [0002] At present, magnetic suspension bearings (referred to as magnetic bearings) are divided into three types: active magnetic bearings, passive magnetic bearings and hybrid magnetic bearings (permanent magnetic bias) according to the way the magnetic force is provided. The hybrid magnetic bearing uses the magnetic field generated by the permanent magnet to replace the static bias magnetic field generated by the electromagnet in the active magnetic bearing, which can greatly reduce the power consumption of the power amplifier, reduce the ampere-turns of the electromagnet, reduce the vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/04
CPCF16C32/0482F16C32/0465
Inventor 费德成孙玉坤朱熀秋全力
Owner JIANGSU UNIV
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