Motor

• US 7,663,274 B2
• Filed: 09/21/2005
• Issued: 02/16/2010
• Est. Priority Date: 09/21/2004
• Status: Expired due to Fees

• Current Assignee: Nidec Corporation
• Original Assignee: Nidec Corporation
• Inventors: Suzuki, Hiroaki, Kataoka, Nakaba, Migita, Takayuki
• Primary Examiner(s): Leung; Quyen
• Assistant Examiner(s): Desai; Naishadh N
• Application Number:
  US11/162,733
• Publication Number:
  US 20060063403A1
• Time in Patent Office: 1,609 Days
• Field of Search: 310/68.B, 439/76.2
• US Class Current: 310/68.00R
• CPC Class Codes: H02K 2203/09 Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
• CPC Class Codes: H02K 29/08 using magnetic effect devices, e.g. Hall-plates, magneto-resistors H02K29/12 takes precedence
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

A motor stator section (3a) is furnished with a busbar (51) attached to an armature (3), and with a circuit board (52) attached to the busbar (51). A parts accommodation recess (516) is formed in the busbar (51) surface that opposes the circuit board (52), and a holding recess (512), in which is anchored a sensor holder (54) that retains Hall sensors (53) mounted on the circuit board (52) is formed in the busbar (51) inner circumferential surface. Further, grooves are formed in the circuit board (52), the sensor holder (54), and the busbar (51), wherein fitting a jig (9) to these grooves enables high-precision assembly of these components.

Claims

1. An electrically powered motor for assisting vehicular driving operations, the motor comprising:

a stator section including a stator core including a plurality of stator teeth, the stator core having a first alignment feature;

a sensor mounting member having a second alignment feature;

a rotor section having a field magnet arranged to generate, between itself and said stator core, torque that centers on a predetermined center axis; and

a bearing mechanism, centered on the center axis, arranged to rotatably support said rotor section with respect to said stator section;

wherein

said stator section includes a sensor arranged to detect a position of the field magnet, the sensor arranged in the sensor mounting member;

said sensor mounting member is fixed indirectly to said stator core; and

the first alignment feature is directly aligned with the second alignment feature such that the sensor is directly aligned with the stator core.

2. A motor as set forth in claim 1, wherein:

the teeth are arranged radially converging on the center axis, with forward edges of the teeth being directed toward the center axis;

the second alignment feature is provided in a rim surface of the sensor mounting member which is substantially parallel to the center axis; and

the first alignment feature is provided on an inner circumferential surface of the stator core.

3. A motor as set forth in claim 2, wherein:

the first alignment feature is one gap among a plurality of gaps, paralleling the center axis, between the forward edges of said plurality of teeth; and

the second alignment feature is a groove.

4. A motor as set forth in claim 1, further comprising:

a busbar member that includes a third alignment feature;

wherein

the third alignment feature is substantially coaxial with the first alignment feature and the second alignment feature; and

a jig is simultaneously received within each of the first alignment feature, the second alignment feature, and the third alignment feature.

5. A motor as set forth in claim 4, wherein:

the busbar member is positioned between the sensor mounting member and the stator core.

6. A motor as set forth in claim 4, wherein the sensor mounting member is arranged on the busbar member.

7. A motor as set forth in claim 6, wherein the busbar member includes a recess arranged to accommodate the sensor mounting member.

8. A motor as set forth in claim 7, wherein an outer circumferential dimension of the sensor mounting member is smaller than an inner circumferential dimension of the recess.

9. A motor as set forth in claim 4, wherein the sensor mounting member includes a surface projection arranged to be received within a recess in the busbar member.

10. A motor as set forth in claim 4, wherein the sensor mounting member includes an L-shaped surface projection arranged to be supported by an inner circumferential surface of a recess defined in an axial end of the busbar member.

11. A motor as set forth in claim 4, wherein the sensor mounting member is arranged to be sandwiched between a circuit board and the busbar member, which is adjacent to the circuit board.

13. The motor as set forth in claim 3, wherein the groove is arranged at a circumferential surface of the sensor mounting member facing the center axis.

12. An electrically powered motor for assisting vehicular driving operations, the motor comprising:

a stator section including a stator core having a first alignment feature in which a jig seats, a sensor mounting member having a second alignment feature in which the jig seats, and a sensor fixed to the sensor mounting member;

a rotor section having a field magnet arranged to generate, between itself and the stator core, torque that centers on a predetermined center axis;

a bearing mechanism, centered on the center axis, arranged to rotatably support the rotor section with respect to the stator section; and

a busbar member arranged between the sensor mounting member and the stator core;

wherein

the sensor is arranged to detect a position of the field magnet;

the sensor mounting member is mounted to the busbar member;

the busbar member is mounted to the stator core; and

the first alignment feature is directly aligned with the second alignment feature when the jig is seated in the first alignment feature and the second alignment feature.