Motor

• US 8,138,644 B2
• Filed: 07/28/2008
• Issued: 03/20/2012
• Est. Priority Date: 07/31/2007
• Status: Active Grant

• Current Assignee: Nidec Corporation
• Original Assignee: Nidec Corporation
• Inventors: Kataoka, Nakaba, Otsuji, Motofumi, Yamashita, Yoshiaki
• Primary Examiner(s): Lam, Thanh
• Application Number:
  US12/671,213
• Publication Number:
  US 20100201213A1
• Time in Patent Office: 1,331 Days
• Field of Search: 310/71, 310/260
• US Class Current: 310/71
• CPC Class Codes: H02K 11/21 Devices for sensing speed or position, or actuated thereby specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles

Abstract

A motor includes a plurality of bus wires of a common phase which are put together before being guided in a common passage to minimize the space arranged to guide the bus wires. Also, the bus wires of a common phase are easily insulated from those of different phases, and an axial height of the motor is reduced. Further, a radial width necessary to guide the bus wires is reduced, and an axial height of the motor including a sensor portion which detects a rotary position of the motor is reduced. Also, the bus wires are easily extended from the armature, and an amount of work required to connect the bus wires and the terminals is reduced. Furthermore, the connection terminal portion does not interfere with the bus wires when they are being guided.

Claims

1. A motor comprising:

a stator portion including an armature having a substantially cylindrical shape;

a rotor portion arranged at an inner side of the armature;

a bearing mechanism arranged to support the rotor portion in a rotatable manner substantially coaxially about a central axis with respect to the stator portion; and

an annular terminal block having a substantially annular shape arranged at one axial end of the armature, the annular terminal block arranged to guide a bus wire extending from the armature and to connect the bus wire to an external power source;

wherein

the annular terminal block includes;

a bus wire guiding portion having a substantially annular shape arranged along the armature, and including a guiding configuration in which a plurality of bus wires of a common phase are guided via a common passage having a substantially arcuate shape; and

a connection terminal portion arranged to connect the plurality of bus wires of a common phase extending from the bus wire guiding portion with the external power source.

2. The motor according to claim 1, wherein the guiding configuration includes a groove in which the plurality of bus wires of a common phase are guided.

3. The motor according to claim 1, wherein the guiding configuration includes the same number of passages as the number of phases, and the bus wires are guided in a corresponding passage having a substantially arcuate shape in accordance with the phase.

4. The motor according to claim 3, wherein the guiding configuration includes a plurality of passages arranged in a radial direction.

5. The motor according to claim 4, wherein

a plurality of coils are connected via a star connection at the armature;

and

a substantially annularly shaped conductive member which defines a neutral point is arranged radially outward of the plurality of passages and on top of a core back connecting a plurality of teeth of the armature.

6. The motor according to claim 4, wherein the bus wires of a common phase are guided in a groove arranged at an opposite side with respect to the armature of the bus wire guiding portion.

7. The motor according to claim 6, wherein the bus wires of a common phase are laminated in the groove in a direction substantially parallel with the central axis.

8. The motor according to claim 7, wherein

the motor further includes a sensor portion arranged to detect a rotary position of the rotor portion;

the bus wire guiding portion includes a non-layered portion at which only one bus wire is guided; and

at least a portion of the sensor portion is arranged above the non-layered portion.

9. The motor according to claim 6, wherein the groove includes a hole via which the bus wire is guided from the armature, and a diameter of the hole is greater than a width of the groove.

10. The motor according to claim 1, wherein at least two of the plurality of bus wires of a common phase are placed together and connected to a terminal of the connection terminal portion.

11. The motor according to claim 10, wherein a bus wire of the plurality of bus wires of a common phase extends from below the connection terminal portion and is placed together with any one of the plurality of bus wires of a common phase to be connected to one of the terminals.

12. The motor according to claim 10, wherein the bus wire guiding portion and the connection terminal portion are detachably connected to one another.

13. The motor according to claim 1, wherein the motor is arranged to assist an operator of a vehicle.