Linear motor for maglev train, and maglev train

Patent metadata

Field	Value
Publication number	US-12358539-B2
Application number	US-202117763656-A
Country	US
Kind code	B2
Filing date	Jan 26, 2021
Priority date	Mar 11, 2020
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A linear motor comprises a primary part and a secondary part opposite to each other. An air gap is reserved between the primary and secondary parts. The air gap has first spacing in non-operating state and second spacing in operating state. The side surface of the primary part facing the secondary part is provided with a magnetically conductive film that has elasticity in the thickness direction and a thickness greater than the first spacing and less than the second spacing. The magnetically conductive film comprises magnetically conductive base bodies and non-magnetically conductive base bodies alternately distributed along the surface of the magnetically conductive film, and the magnetically conductive base bodies are filled with magnetically conductive materials. The magnetically conductive base bodies cover magnetic poles on the side surface of the primary part facing the secondary part, and the non-magnetically conductive base bodies shield gaps between the adjacent magnetic poles.

First claim

The invention claimed is:

1. A linear motor of a maglev train, comprising: a primary and a secondary that are arranged oppositely, wherein an air gap is provided between the primary and the secondary, the air gap has a first distance in a non-working state, and has a second distance in a working state;
a permeability magnetic film is provided on a surface of the primary facing the secondary, the permeability magnetic film is elastic in a thickness direction, and a thickness of the permeability magnetic film is greater than the first distance and is smaller than the second distance; and
the permeability magnetic film comprises a permeability magnetic substrate and a non-permeability magnetic substrate that are alternately distributed along a surface of the permeability magnetic film, and the permeability magnetic substrate is filled with a permeability magnetic film material; the permeability magnetic substrate covers a magnetic pole of the surface of the primary facing the secondary, and the non-permeability magnetic substrate covers a gap between adjacent magnetic poles.

2. The linear motor of a maglev train according to claim 1 , wherein the permeability magnetic film is rigid in a direction parallel to a surface of the permeability magnetic film.

3. The linear motor of a maglev train according to claim 1 , wherein a surface of the non-permeability magnetic substrate facing the primary is higher than a surface of the permeability magnetic substrate facing the primary.

4. The linear motor of a maglev train according to claim 3 , wherein a surface of the non-permeability magnetic substrate facing the secondary has the same height as a surface of the permeability magnetic substrate facing the secondary.

5. The linear motor of a maglev train according to claim 4 , wherein the surface of the non-permeability magnetic substrate facing the primary is higher than the surface of the permeability magnetic substrate facing the primary by a height in a range of 1.5 mm to 2.5 mm, including marginal values.

6. The linear motor of a maglev train according to claim 5 , wherein a thickness of the permeability magnetic substrate ranges from 7 mm to 8 mm, including marginal values.

7. The linear motor of a maglev train according to claim 1 , wherein the permeability magnetic film material comprises a granular iron material or a threadiness iron material.

8. A maglev train, comprising a linear motor, the linear motor comprising: a primary and a secondary that are arranged oppositely, wherein an air gap is provided between the primary and the secondary, the air gap has a first distance in a non-working state, and has a second distance in a working state;
a permeability magnetic film is provided on a surface of the primary facing the secondary, the permeability magnetic film is elastic in a thickness direction, and a thickness of the permeability magnetic film is greater than the first distance and is smaller than the second distance; and
the permeability magnetic film comprises a permeability magnetic substrate and a non-permeability magnetic substrate that are alternately distributed along a surface of the permeability magnetic film, and the permeability magnetic substrate is filled with a permeability magnetic film material; the permeability magnetic substrate covers a magnetic pole of the surface of the primary facing the secondary, and the non-permeability magnetic substrate covers a gap between adjacent magnetic poles.

9. The linear motor of a maglev train according to claim 8 , wherein the permeability magnetic film is rigid in a direction parallel to a surface of the permeability magnetic film.

10. The linear motor of a maglev train according to claim 8 , wherein a surface of the non-permeability magnetic substrate facing the primary is higher than a surface of the permeability magnetic substrate facing the primary.

11. The linear motor of a maglev train according to claim 10 , wherein a surface of the non-permeability magnetic substrate facing the secondary has the same height as a surface of the permeability magnetic substrate facing the secondary.

12. The linear motor of a maglev train according to claim 11 , wherein the surface of the non-permeability magnetic substrate facing the primary is higher than the surface of the permeability magnetic substrate facing the primary by a height in a range of 1.5 mm to 2.5 mm, including marginal values.

13. The linear motor of a maglev train according to claim 12 , wherein a thickness of the permeability magnetic substrate ranges from 7 mm to 8 mm, including marginal values.

14. The linear motor of a maglev train according to claim 8 , wherein the permeability magnetic film material comprises a granular iron material or a threadiness iron material.

Assignees

• Crrc Qingdao Sifang Co Ltd

Inventors

• Liang Jianying
• Liu Xiankai
• Wu Donghua
• Han Weitao
• Luan jin
• Jiang Fujie

Classifications

• H02N15/00

  Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for (electric or magnetic devices for holding work on machine tools B23Q3/15 {; monorail vehicle propulsion or suspension B60L13/00}; sliding or levitation devices for railway systems B61B13/08; material handling devices associated with conveyors incorporating devices with electrostatic or magnetic grippers B65G47/92; separating thin or filamentary articles from piles using magnetic force B65H3/16; delivering thin or filamentary articles from magnetic holders by air blast or suction B65H29/24; bearings using magnetic or electric supporting means F16C32/04; relieving bearing loads using magnetic means F16C39/06; magnets H01F7/00; dynamo-electric clutches or brakes H02K49/00 {; electric furnaces with simultaneous levitation and heating H05B6/32}) · CPC title

• H01F7/0247

  Orientating, locating, transporting arrangements · CPC title

• H01F7/0236

  Magnetic suspension or levitation (for vehicles B60L13/04; magnetic bearings F16C39/063) · CPC title

• H02K41/03 Primary

  Synchronous motors; Motors moving step by step; Reluctance motors (H02K41/035 takes precedence) · CPC title

• H02K41/02 Primary

  Linear motors; Sectional motors · CPC title