Commutator assembly for motor

• US 20030057798A1
• Filed: 09/26/2001
• Published: 03/27/2003
• Est. Priority Date: 05/12/2000
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Nakayama, Eiji, Yamamoto, Masayoshi, Ohata, Katsumi, Okada, Keigo
• Granted Patent: US 6,949,859 B2
• Time in Patent Office: Days
• US Class Current: 310/234
• CPC Class Codes: H01R 39/32 Connections of conductor to commutator segment
• CPC Class Codes: H02K 13/04 Connections between commutator segments and windings

Abstract

A commutator assembly for a motor has a recessed portion formed to each commutator segment so that coils, which are pressed and deformed by bending the hooks of commutator segments, can be accommodated in the recessed portion. With this arrangement, the commutator assembly can improve the reliability of electric connection of the hook of the commutator segments with a conductive wire.

Claims

1. A commutator assembly for a motor, comprising:

a commutator including a base secured to a shaft to which an armature is secured and commutator segments disposed on the outer peripheral surface of said base in a peripheral direction, said commutator segments having hooks formed on one side thereof and bent to have a plurality of conductive wires locked thereto,

wherein a recessed portion, in which the plurality of conductive wires compressed and deformed by bending said hooks are accommodated, is formed to each of said commutator segments.

2. A commutator assembly according to claim 1, wherein said recessed portion is formed to the large diameter portion of said commutator segment, has a diameter larger than the diameter of the portion, with which brushes come into contact, of said commutator and is formed to the root of said hook.

4. A commutator assembly according to claim 1, wherein said recessed portion has an inclining surface formed thereto the depth of which increases as the inclining surface is apart from the root of the hook.

5. A commutator assembly according to claim 1, wherein press and deformation promoting means is formed to said recessed portion to promote the press and deformation of the conductive wires.

6. A commutator assembly according to claim 5, wherein said press and deformation promoting means comprises a stepped portion.

7. A commutator assembly according to claim 1, wherein the plurality of conductive wires include conductive wires having a different wire diameter.

8. A commutator assembly according to claim 1, wherein the plurality of conductive wires include conductive wires formed of a different material.

9. A commutator assembly according to claim 7, wherein said plurality of conductive wires comprise a plurality of coils constituting the winding of the armature and equalizers having a wire diameter smaller than that of the coils and electrically connecting commutator segments, which should have the same electric potential, to each other.

10. A commutator assembly according to claim 8, wherein the plurality of conductive wires comprise a plurality of coils constituting the winding of the armature and equalizers formed of a material different from that of the coils and electrically connecting commutator segments, which should have the same electric potential, to each other.

11. A commutator assembly according to claim 9, wherein the equalizers comprise a brass wire having an insulating film formed on the surface thereof.

12. A commutator assembly according to claim 9, wherein the equalizers comprise a red brass wire having an insulating film formed on the surface thereof.

3. A commutator assembly for a motor, comprising:

a commutator including a base secured to a shaft to which an armature is secured and commutator segments disposed on the outer peripheral surface of said base in a peripheral direction, said commutator segments having hooks formed on one side thereof and bent to have a plurality of conductive wires locked thereto,

wherein a recessed portion, in which said plurality of conductive wires compressed and deformed by bending said hooks are accommodated, is formed to each of said hooks.