MOTOR

• US 20150137639A1
• Filed: 11/13/2014
• Published: 05/21/2015
• Est. Priority Date: 11/15/2013
• Status: Abandoned Application

• Current Assignee: Nidec Sankyo Corporation (Nidec Corporation), Nidec Sankyo Electronics (Shanghai) Corp. (Nidec Corporation)
• Original Assignee: Nidec Sankyo Corporation (Nidec Corporation), Nidec Sankyo Electronics (Shanghai) Corp. (Nidec Corporation)
• Inventors: GOMYO, Masato, CHEN, Zhan Wen
• Application Number:
  US14/540,572
• Publication Number:
  US 20150137639A1
• Time in Patent Office: Days
• US Class Current: 310/71
• CPC Class Codes: H02K 1/14 Stator cores with salient poles
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures
• CPC Class Codes: H02K 3/521 applicable to stators only
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 7/116 with gears

Abstract

A motor may include a rotor having a magnet and a stator having a stator core and a coil. The stator core is provided with salient poles, including a predetermined salient pole, separately formed in the circumferential direction, the salient poles are protruded to an inner side and face the magnet through a gap space, and the predetermined salient pole is wound around with the coil through a coil bobbin. The stator core is provided with a connecting part which connects end parts of the salient poles. The coil bobbin is provided with a body part around which the coil is wound and an insertion hole formed in the body part and into which the predetermined salient pole is inserted. The coil bobbin and the stator core engage with the other to restrain displacement of the coil bobbin to the inner side.

Claims

1. A motor comprising:

a rotor comprising a magnet whose peripheral face is alternately magnetized in an “

S”

-pole and an “

N”

-pole in a circumferential direction; and

a stator comprising a stator core and a coil;

wherein the stator core is provided with a plurality of salient poles, including a predetermined salient pole, which are separately formed in the circumferential direction, the plurality of the salient poles being protruded to an inner side in a radial direction and facing the peripheral face of the magnet through a gap space, the predetermined salient pole being wound around with the coil through a coil bobbin;

wherein the stator core is provided with a connecting part which connects end parts on an outer side in the radial direction of the plurality of the salient poles;

wherein the coil bobbin is provided with a body part around which the coil is wound and a salient pole insertion hole which is formed in the body part and into which the predetermined salient pole is inserted; and

wherein one of the coil bobbin and the stator core is formed with an engaging part which is engaged with another of the coil bobbin and the stator core to restrain displacement of the coil bobbin to the inner side in the radial direction.

2. The motor according to claim 1, wherein

the engaging part includes a protruded engaging part which is formed in the coil bobbin, and

the protruded engaging part is protruded to the outer side in the radial direction relative to the body part of the coil bobbin to engage with the connecting part of the stator core.

3. The motor according to claim 2, wherein the connecting part is locked between the protruded engaging part and the body part.

4. The motor according to claim 2, wherein

the coil bobbin is provided with a flange part on the outer side in the radial direction of the body part, and

the protruded engaging part is protruded from the flange part to the outer side in the radial direction to engage with the connecting part of the stator core.

5. The motor according to claim 4, wherein the connecting part is locked between the protruded engaging part and the flange part.

6. The motor according to claim 2, wherein the protruded engaging part is provided with an arm part, which protrudes to the outer side in the radial direction relative to the body part, and an engaging tip end part which is bent toward a connecting part side from a tip end of the arm part to engage with the connecting part.

7. The motor according to claim 6, wherein

an outer side face of the engaging tip end part in the radial direction is formed as an inclined face which is inclined with respect to the radial direction, and

the inclined face is directed to a side where the stator core is located in an axial direction of the rotor.

8. The motor according to claim 1, wherein

the coil bobbin is provided with a flange part on the outer side in the radial direction of the body part, and

the flange part is interposed between a portion of the connecting part located on a side with respect to the predetermined salient pole in the circumferential direction and a portion of the connecting part located on the outer side in the radial direction of the flange part.

9. The motor according to claim 4, wherein

the engaging part comprises a first protruded part formed on a portion of the connecting part located on a side with respect to the predetermined salient pole in the circumferential direction, and

the flange part is interposed between a portion of the connecting part located on the outer side in the radial direction relative to the flange part and the first protruded part.

10. The motor according to claim 9, wherein the flange part is locked between the portion of the connecting part located on the outer side in the radial direction relative to the flange part and the first protruded part.

11. The motor according to claim 1, wherein

the engaging part comprises a second protruded part which is formed on one of an outer peripheral face of the predetermined salient pole and an inner wall face of a salient pole insertion hole of the body part, and

the second protruded part is engaged with another of the outer peripheral face of the predetermined salient pole and the inner wall face of the salient pole insertion hole of the body part.

12. The motor according to claim 11, wherein the second protruded part is formed at a position which is near to the magnet.

13. The motor according to claim 11, wherein the second protruded part is extended along the radial direction.

14. The motor according to claim 11, wherein the engaging part comprises a recessed part which is formed on the other of the outer peripheral face of the predetermined salient pole and the inner wall face of the salient pole insertion hole to engage with the second protruded part.

15. The motor according to claim 14, wherein

the inner wall face of the salient pole insertion hole is formed with the second protruded part, and

the outer peripheral face of the predetermined salient pole is formed with the recessed part.

16. The motor according to claim 14, wherein the second protruded part and the recessed part are formed at a position which is near to the magnet.

17. The motor according to claim 14, wherein the second protruded part and the recessed part are extended along the radial direction.

18. The motor according to claim 17, wherein the second protruded part and the recessed part are formed so as to extend continuously along the radial direction or formed at plural positions in the radial direction in a separated manner.

19. The motor according to claim 1, wherein

the coil bobbin is formed with a terminal fixed part to which a terminal is fixed, and

an end part of a winding of the coil is wound around the terminal.

20. The motor according to claim 19, further comprising a case,

wherein the rotor and the stator are accommodated in the case, and

wherein the terminal is protruded to an outside of the case through a through hole provided in the case.

21. The motor according to claim 1, wherein

a number of the salient poles is three or more, and

a number of the predetermined salient pole is two.

22. The motor according to claim 21, wherein the number of the salient poles is six.

23. The motor according to claim 1, wherein a length in the radial direction of the predetermined salient pole is longer than lengths in the radial direction of other salient poles.