Axial gap electronic motor

• US 7,221,073 B2
• Filed: 02/23/2004
• Issued: 05/22/2007
• Est. Priority Date: 02/26/2003
• Status: Active Grant

• Current Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Inventors: Terakubo, Hidetaka, Yamada, Shinichi, Yamada, Masaki, Tanabe, Yoichi, Fujioka, Takushi, Shinohara, Takayuki, Igarashi, Hisao, Kojima, Tomonori, Kashiwagi, Tomohiro
• Primary Examiner(s): NGUYEN, TRAN N
• Application Number:
  US10/782,756
• Publication Number:
  US 20040164641A1
• Time in Patent Office: 1,184 Days
• Field of Search: 310216-218, 310/194, 310/254, 310/261, 310/267, 310/268, 336/234, 336/233, 336/212
• US Class Current: 310/216.105
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/182 to stators axially facing the rotor, i.e. with axial or conical air gap
• CPC Class Codes: H02K 15/095 by laying conductors around salient poles
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 2203/12 Machines characterised by the bobbins for supporting the windings
• CPC Class Codes: H02K 3/524 for U-shaped, E-shaped or similarly shaped cores
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 7/08 Structural association with bearings

Abstract

An axial gap electronic motor includes a stator and a rotor disposed opposingly with a predetermined gap. In order to provide an easy assembling operation of the stator, the stator includes a plurality of pole members annularly connectable. The annular stator core is obtained by connecting each of the pole members to which coil winding is previously applied.

Claims

1. An axial gap electronic motor comprising a stator and a rotor each formed approximately in a disc shape and disposed opposingly at a same rotary shaft with a predetermined gap,

wherein said stator comprises a plurality of pole members annularly connected, each of said pole members having a stator iron core, an insulator for winding a coil, said insulator being integrally formed with the stator iron core as one unit and having connecting means for connecting adjacent pole members, and a coil wound around the insulator, and

wherein said insulator has a bobbin shape including a pair of left and right flanges, and said connecting means comprises first connecting means and second connecting means formed at outer and inner periphery sides of the respective flanges of the insulator when viewed from a center of the stator.

2. The axial gap electronic motor according to claim 1, wherein said flanges are formed to be larger than winding width of the coil wound around said insulator.

3. The axial gap electronic motor according to claim 1, wherein said stator iron core is provided with a skew inclined at a predetermined angle with respect to a rotating direction of said rotor.

4. The axial gap electronic motor according to claim 1, wherein a pair of rotors is provided at a left and a right with said stator therebetween.

5. The axial gap electronic motor according to claim 1, wherein said stator iron core and said insulator form said one unit integrally joined and fixed together without separation.

6. An axial gap electronic motor comprising a stator and a rotor each formed approximately in a disc shape and disposed opposingly at a same rotary shaft with a predetermined gap,

wherein said stator comprises a plurality of pole members annularly connected, each of said pole members having a stator iron core, an insulator for winding a coil, said insulator being integrally formed with the stator iron core as one unit and having connecting means for connecting adjacent pole members, and a coil wound around the insulator, and

wherein a connecting wire support member for supporting a connecting wire to be laid between the pole members is integrally provided in at least one of said flanges in each of said pole members.

7. The axial gap electronic motor according to claim 6, wherein said connecting wire support member is provided to jut out to a side of said flange.

8. The axial gap electronic motor according to claim 6, wherein a connecting wire housing groove for catching said connecting wire is formed on said connecting wire support member.

9. The axial gap electronic motor according to claim 8, wherein in at least part of said connecting wire housing groove, groove width of an opening is formed to be narrower than groove width of an inside so that said connecting wire cannot easily fall off.

10. The axial gap electronic motor according to claim 9, wherein said connecting wire housing groove has an approximately C-shaped section.

11. The axial gap electronic motor according to claim 8, wherein a number of said connecting wire housing grooves corresponds to at least a number of phases.

12. The axial gap motor according to claim 8, wherein in a case in which at least two of said connecting wire housing grooves are provided at said connecting wire support member, one of the connecting wire housing grooves is disposed at an upper surface side of said connecting wire support member and the other connecting wire housing groove is disposed at a lower surface side of said connecting wire support member.

13. The axial gap electronic motor according to claim 6, wherein said connecting wire support member is provided with a twining portion around which a winding start end and a winding terminal end of the coil wound around said stator iron core are wound.

14. The axial gap electronic motor according to claim 13, wherein said twining portion has a first rod portion at a side of the winding start end of said coil and a second rod portion at a side of the winding terminal end of said coil, and a stopper with an extended diameter for preventing the coil from falling off is formed at a head portion of each of said rod portions.

15. The axial gap electronic motor according to claim 13, wherein in a case in which at least two of said twining portions are provided at said connecting wire support member, said twining portions are disposed at positions with different heights.

16. The axial gap electronic motor according to claim 14, wherein coil catching grooves, for passing a part of the coil passing from the first rod portion at the side of the winding start end of said coil to an inside of said insulator and a part of the coil passing from the inside of said insulator to the second rod portion at the side of the winding terminal end of said coil, are formed at an upper edge of said flange.

17. An axial gap electronic motor comprising a stator and a rotor each formed approximately in a disc shape and disposed opposingly at a same rotary shaft with a predetermined gap,

wherein said stator comprises a plurality of pole members annularly connected, each of said pole members having a stator iron core, an insulator for winding a coil, said insulator being integrally formed with the stator iron core as one unit and having connecting means for connecting adjacent pole members, and a coil wound around the insulator, and

wherein said connecting means includes a rotatable engaging member comprising a combination of a boss formed on one side face of a flange of the insulator and a bearing recessed portion formed on a side face of a flange of another pole member opposite thereto.

18. An axial gap electronic motor comprising a stator and a rotor each formed approximately in a disc shape and disposed opposingly at a same rotary shaft with a predetermined gap,

wherein said stator comprises a plurality of pole members annularly connected, each of said pole members having a stator iron core, an insulator for winding a coil, said insulator being integrally formed with the stator iron core as one unit and having connecting means for connecting adjacent pole members, and a coil wound around the insulator, and

wherein resin introducing passages for enhancing flow of a resin when the pole members are integrally connected to each other by the resin, are provided at part of said insulator.

19. An axial gap electronic motor comprising a stator and a rotor each formed approximately in a disc shape and disposed opposingly at a same rotary shaft with a predetermined gap,

wherein said stator comprises a plurality of pole members annularly connected, each of said pole members having a stator iron core, an insulator for winding a coil, said insulator being integrally formed with the stator iron core as one unit and having connecting means for connecting adjacent pole members, and a coil wound around the insulator, and

wherein said stator iron core has a pair of tooth portions opposing said rotor and a winding portion formed between said tooth portions for winding said coil therearound, and said tooth portions have same projection areas to a left and a right lamination areas with said winding portion therebetween.

20. An axial gap electronic motor comprising a stator and a rotor each formed approximately in a disc shape and disposed opposingly at a same rotary shaft with a predetermined gap,

wherein said stator comprises a plurality of pole members annularly connected, and

wherein each of said pole members has a stator iron core, and a bobbin-shaped insulator including a pair of left and right flanges for winding a coil and formed around said stator iron core, and said insulator is provided with connecting means for connecting each of said adjacent pole members,

wherein said connecting means includes at least one of a rotatable first engaging member and a rotatable second engaging member, said first engaging member comprising a combination of a boss and a bearing recessed portion therefor, said boss and recessed portion being provided at outer periphery sides, seen from a center of said stator, on opposing surfaces of said flanges of said adjacent pole members, and said second engaging member comprising a combination of a boss and a bearing recessed portion therefor, said boss and bearing recessed portion of the second engaging member being provided at inner circumferential sides, seen from the center of said stator, on the opposing surfaces of said flanges of said adjacent pole members.

21. An axial gap electronic motor comprising a stator and a rotor each formed approximately in a disc shape and disposed opposingly at a same rotary shaft with a predetermined gap,

wherein said stator comprises a plurality of pole members annularly connected, and

wherein each of said pole members has a stator iron core, and a bobbin-shaped insulator including a pair of left and right flanges for winding a coil and formed around said stator iron core, and said insulator is provided with connecting means for connecting each of said adjacent pole members,

wherein a connecting wire support member for supporting a connecting wire to be laid between the pole members is integrally provided in at least one of said flanges in each of said pole members, and

wherein a connecting wire housing groove for catching said connecting wire is formed on said connecting wire support member.