Magnetic levitation planar motor workbench having double-layer winding of coarse and fine drive

Patent metadata

Field	Value
Publication number	US-12149143-B2
Application number	US-202418679469-A
Country	US
Kind code	B2
Filing date	May 31, 2024
Priority date	May 23, 2022
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

The disclosure discloses a magnetic levitation planar motor workbench having a double-layer winding of coarse and fine drive, which belongs to the technical field of planar motors, and includes a stator and a mover. The vertically magnetized permanent magnets and the horizontally magnetized permanent magnets in the stator are arranged in a Halbach arrangement; the mover is located on the enhanced side of the air gap magnetic field above the stator. The mover adopts the double-layer winding of unequal heights, and the height of the upper first winding is smaller than the lower second winding. Each layer of winding may generate driving forces in six directions to achieve six-degree-of-freedom driving.

First claim

What is claimed is:

1. A magnetic levitation planar motor workbench having a double-layer winding of coarse and fine drive, wherein the workbench comprises a stator ( 4 ) and a mover ( 8 ), wherein
the stator ( 4 ) comprises a base ( 3 ), and a plurality of vertically magnetized permanent magnets ( 1 ) and a plurality of horizontally magnetized permanent magnets ( 2 ) arranged in a groove of the base ( 3 ) in a Halbach arrangement;
the mover ( 8 ) is located on an enhanced side of a magnetic field generated by the stator ( 4 ); the mover ( 8 ) comprises a first winding ( 6 ) and a second winding ( 7 ) stacked under the first winding ( 6 ), and a height of the first winding ( 6 ) is less than a height of the second winding ( 7 ); both the first winding ( 6 ) and the second winding ( 7 ) comprise a plurality of coils generating driving forces in two directions after being energized, so that the first winding ( 6 ) and the second winding ( 7 ) each have a six-degree-of-freedom driving force and a driving torque; a contour shape of the mover ( 8 ) is in a square shape or a semi-square shape.

2. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 1 , wherein a height ratio of the first winding ( 6 ) to the second winding ( 7 ) is range from 0.2 to 0.6.

3. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 1 , wherein the first winding ( 6 ) comprises four groups of first single-phase windings arranged in 2 rows and 2 columns, the first single-phase winding comprises a rectangular coils arranged in parallel at equal intervals, and long sides of the rectangular coils of every two adjacent groups of first single-phase windings are perpendicular to each other;
the second winding ( 7 ) has same structure as the first winding ( 6 ) and differs only in height, and the rectangular coils in the first winding ( 6 ) and rectangular coils in the second winding ( 7 ) are stacked up and down in a one-to-one correspondence.

4. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 3 , wherein the long sides of the rectangular coils in the first winding ( 6 ) and the second winding ( 7 ) are all at an angle of 45°±1° to catheti of the vertically magnetized permanent magnets ( 1 ).

5. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 3 , wherein in the first single-phase winding, a length of the long side of the rectangular coil is four times a pole pitch, and a center distance between adjacent rectangular coils is 4/3 times the pole pitch.

6. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 1 , wherein the first winding ( 6 ) comprises three groups of second single-phase windings, and the second single-phase winding comprises b rectangular coils sequentially stacked in a step-shape manner, one of the groups of the second single-phase windings is placed flat in middle, and the other two groups of the second single-phase windings are respectively placed vertically at upper left and lower right steps of the second single-phase winding in middle and are attached with step connections of the second single-phase winding in middle;
the second winding ( 7 ) has same structure as the first winding ( 6 ) but differs in height, and an orientation of the first winding ( 6 ) rotated 90° Counterclockwise around a center thereof is an orientation of the second winding ( 7 ).

7. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 1 , wherein the first winding ( 6 ) comprises c rows, each of the rows has d rectangular coils, short sides of adjacent rectangular coils in each of the rows are connected, and adjacent rows are staggered left and right;
the second winding ( 7 ) has same structure as the first winding ( 6 ) but differs in height, and long sides of the rectangular coils in the first winding ( 6 ) and long sides of the rectangular coils in the second winding ( 7 ) are perpendicular to each other.

8. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 1 , wherein both the first winding ( 6 ) and the second winding ( 7 ) comprise circular coils in e rows and e columns, and the circular coils in the first winding ( 6 ) and the second winding ( 7 ) are stacked up and down in concentric circles in a one-to-one correspondence.

9. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 1 , wherein the workbench further comprises a vacuum cover, and the mover ( 8 ) is disposed inside the vacuum cover.

10. The magnetic levitation planar motor workbench having the double-layer winding of coarse and fine drive as claimed in claim 1 , wherein the vertically magnetized permanent magnet ( 1 ) is in a square shape, and the horizontally magnetized permanent magnet ( 2 ) is in a rectangular shape.

Assignees

• Univ Huazhong Science Tech

Inventors

• Zeng Lizhan
• Liu Kai
• Chen Xuedong

Classifications

• H10P72/50 Primary

  for positioning, orientation or alignment · CPC title

• 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

• H02K2201/18

  Machines moving with multiple degrees of freedom · CPC title

• H02K41/03

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

• H02K41/031 Primary

  of the permanent magnet type · CPC title