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Magnetic shield structure for brow leakage of motor coils of molecular pump

A coil end, molecular pump technology, applied in the direction of preventing/reducing eddy current loss in the winding head, etc., can solve the problems of heat generation, reduce the magnetic field strength at the moving impeller of the molecular pump, etc., to reduce the magnetic field strength, compact structure, and control stress. and deformation effects

Inactive Publication Date: 2015-02-11
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can shield the deficiency of magnetic flux leakage at the end of the molecular pump motor coil, greatly reduce the magnetic field intensity at the moving impeller of the molecular pump, solve the problem of heating of the moving impeller due to the cutting of the magnetic force line to form an eddy current, and further control the stress and deformation of the moving impeller

Method used

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  • Magnetic shield structure for brow leakage of motor coils of molecular pump
  • Magnetic shield structure for brow leakage of motor coils of molecular pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] figure 1 It is a cross-sectional view of the magnetic isolation structure of the magnetic flux leakage at the end of the molecular pump motor coil of the present invention, figure 2 for figure 1 Schematic diagram of the structure of the magnetic isolation sheet in . exist figure 1 , 2 Among them, the magnetic isolation structure of the magnetic flux leakage at the end of the molecular pump motor coil of the present invention includes a magnetic isolation sheet 1, a magnetic isolation sheet seat 2, a pressure ring 3, a motor coil 4, a motor iron core 5, and a motor stator casing 6; The relationship is that the magnetic isolation sheet 1 is bonded on the inner bottom plane of the cylindrical magnetic isolation sheet seat 2; the upper plane of the pressure ring 3 is in contact with the lower plane of the magnetic isolation sheet 1, and the outer ring surface of the pressure ring 3 passes through Glue is fixedly connected to the inner side of the magnetic isolation she...

Embodiment 2

[0024] The structure of this embodiment is the same as that of Embodiment 1, the difference is that the material of the magnetic isolation sheet seat is aviation aluminum which is a non-magnetic material. The material of the pressure ring is aviation aluminum which is non-magnetic material.

Embodiment 3

[0026] The structure of this embodiment is the same as that of Embodiment 1, the difference is that the material of the magnetic isolation sheet base is stainless steel which is a non-magnetic material. The material of the pressure ring is non-magnetic material stainless steel.

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Abstract

The invention provides a magnetic shield structure for brow leakage of motor coils of a molecular pump. Magnetic shield sheets in the magnetic shield structure are respectively made of soft magnetic ferrite, and are respectively spliced in magnetic shield sheet seats; the outer ring face of each compression ring is fixedly connected with the inner side of each magnetic shield sheet seat through gluing, and each magnetic shield sheet seat is compressed by the compression ring; the magnetic shield sheet seats are assembled on a motor stator shell in an interference manner. According to the magnetic shield structure provided by the invention, by adopting the magnetic shield sheets respectively made of the soft magnetic ferrite, a magnetic field formed by the brow leakage of each motor coil is effectively isolated, and the magnetic field intensity nearby an impeller in the molecular pump is reduced, and therefore the problem that the impeller emits heat due to the fact that magnetic lines are cut by the impeller to form eddy current is solved, and the stress and deformation of the impeller are further controlled.

Description

technical field [0001] The invention belongs to the technical field of magnetic flux leakage shielding for motors, and in particular relates to a magnetic isolation structure for magnetic flux leakage at the end of a molecular pump motor coil. Background technique [0002] Molecular pump belongs to high-speed rotating vacuum obtaining equipment, including moving impeller, stationary vane, high-speed motor, rolling bearing and so on. The molecular pump impeller is driven by a high-speed motor, and there is a magnetic field formed by magnetic leakage at the end of the motor coil. In order to solve the problem of magnetic flux leakage, the Chinese patent titled "Anti-magnetic Flux Leakage Structure of DC Motor" (Patent Publication No.: CN200920072033.1) discloses that a magnetic block is installed between adjacent magnetic poles of the motor casing to reduce leakage. Magnetic, but there is a gap between the magnetic blocks and the magnetic permeability of the magnetic blocks i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/42
CPCH02K3/42
Inventor 何朝晖陶继忠夏欢王兴华王文升雷艳华叶超杨国明张明君岳晓斌
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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