Multi-phase linear motor with continuously wound coils in each phase

Patent metadata

Field	Value
Publication number	US-9837884-B2
Application number	US-201414495114-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Sep 24, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A linear motor includes an excitation unit including a shaft and a plurality of permanent magnets located in the shaft, and an armature including a plurality of coils surrounding the excitation unit and a magnetic cover covering the coils. The plurality of coils of the same phase group are continuously wound over a plurality of insulative bobbins. A tap conductor, a jumper wire between the coils, and a terminal wire of the coils in different phase groups that are continuously wound are separately disposed in different corner portions in the magnetic cover, and the terminal wire of each phase is connected to a circuit board.

First claim

What is claimed is:

1. A multi-phase linear motor comprising:
an excitation unit including a shaft and a plurality of permanent magnets located in the shaft; and
an armature including a plurality of phase groups, each phase group comprising a plurality of coils surrounding the excitation unit, and a magnetic cover covering the coils,
wherein the plurality of coils of each one of the plurality of phase groups are continuously wound over a plurality of insulative bobbins, and a jumper wire between the coils and a terminal wire of the coils in a same one of the phase groups that are continuously wound are disposed in a same corner portion in the magnetic cover, and a jumper wire between the coils and a terminal wire of the coils in different phase groups that are continuously wound are separately disposed in different corner portions in the magnetic cover, and the terminal wire of each phase is connected to a circuit board.

2. The linear motor according to claim 1 ,
wherein the jumper wire between the coils and the terminal wire of each phase is supported by a part of a flange portion of the bobbin.

3. The linear motor according to claim 1 ,
wherein the circuit board is erected with respect to an axial direction of the shaft.

4. The linear motor according to claim 1 ,
wherein the magnetic cover is mounted on a frame, the frame including a cooling path that allows cooling air to pass therethrough.

5. The linear motor according to claim 1 ,
wherein the bobbin includes a column portion serving as a core on which the coil is wound, and a pair of flange portions that delimit a winding width of the coil and serve as insulating spacers between the coils, and
one of the flange portions includes an inlet groove for introducing an insulated shielded wire to a circumferential surface of the column portion, and the other flange portion includes an outlet groove for drawing out the insulated shielded wire from the coil.

6. The linear motor according to claim 5 ,
wherein the bobbin includes a support groove formed on one of the flange portions for supporting the jumper wire between the coils.

7. The linear motor according to claim 6 , wherein:
the inlet groove is formed in one of a plurality of flange corner portions included in the one flange portion; and
respective support grooves are disposed in each of the other plurality of flange corner portions included in the one flange portion.

8. The linear motor according to claim 7 , wherein the jumper wire of each different phase group is supported by the support groove of a different one of the flange corner portions.

9. The linear motor according to claim 5 , wherein respective outlet grooves are disposed in each of a plurality of different flange corner portions included in the other flange portion.

10. The linear motor according to claim 9 , wherein the jumper wire of each different phase group is supported by the outlet groove of a different one of the other flange corner portions.

11. The linear motor according to claim 5 , wherein the flange portions of the bobbin are formed into an approximately rectangular shape.

12. The linear motor according to claim 1 ,
wherein the bobbin includes an engaging device formed on each of the flange portions for connecting the bobbins.

13. The linear motor according to claim 12 ,
wherein the engaging device of the bobbin includes an engaging hole formed in one of the flange portions and an engaging projection formed on the other flange portion.

14. The linear motor according to claim 12 ,
wherein the engaging device of the bobbin includes a recessed portion formed in one of the flange portions, and the recessed portion is engaged with the other flange portion in a predetermined angular orientation.

15. The linear motor according to claim 1 ,
wherein the circuit board includes a holding groove for holding an end portion of an insulated shielded wire of each phase, and a land formed around the holding groove for connection by soldering.

16. The linear motor according to claim 15 ,
wherein the circuit board includes a through hole through which the shaft is passed, and a land formed around the through hole for connecting a ground wire by soldering.

17. The linear motor according to claim 1 ,
further comprising a neutral point circuit board located on a distal side with respect to the circuit board, for connecting a conductor of the coil of each phase group on the distal side.

18. The linear motor according to claim 1 ,
wherein the circuit board is interposed between the coil and a bush holder in an erected position.

19. The linear motor according to claim 1 ,
wherein the magnetic cover includes a cutaway portion that allows the circuit board to be inserted therein in an erected position.

Assignees

• Sanyo Electric Co

Inventors

• Tang Yuqi
• Matsushita Takashi

Classifications

• H02K5/02

  Casings or enclosures characterised by the material thereof · CPC title

• H02K41/031

  of the permanent magnet type · CPC title

• Y02T10/641

  Cross-Sectional Technologies · mapped topic

• H02K9/02 Primary

  by ambient air flowing through the machine · CPC title

• H02K41/02 Primary

  Linear motors; Sectional motors · CPC title