Motor

Patent metadata

Field	Value
Publication number	US-9954410-B2
Application number	US-201514821946-A
Country	US
Kind code	B2
Filing date	Aug 10, 2015
Priority date	Sep 17, 2014
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

The motor comprises a rotary unit, a stationary unit disposed around the rotary unit, and a bearing mechanism. The rotary unit comprises a plurality of magnets, a rotor core, a resin portion which covers the plurality of magnets and the rotor core. The rotor core comprises a ring-shaped inner core portion disposed at a radially inner side of the plurality of magnets, an outer core portion, and a plurality of connecting portions which radially connects the plurality of core elements, which are disposed between the plurality of magnets, and the inner core portion. The resin portion comprises an upper resin portion and a lower resin portion. The upper resin portion includes a plurality of gate holes. The lower resin portion is disposed at a more radially inner side than the plurality of outer core elements, and further comprises a first core support mark which exposes a part of the bottom surface of the rotor core, and a second core support mark disposed in the outer core part, and exposes a part of the bottom surface of the rotor core.

First claim

What is claimed is:

1. A motor, comprising:
a rotary unit which rotates on a vertical center axis;
a stationary unit which is disposed around the rotary unit; and
a bearing mechanism which rotatably supports the rotary unit relative to the stationary unit,
wherein the rotary unit comprises:
a plurality of magnets arranged in a circumferential direction;
a rotor core provided with a plurality of magnetic steel plates laminated in an axial direction; and
a resin portion covering the plurality of magnets and the rotor core,
when seen from above, a radial length of each of the plurality of magnets is longer than its circumferential length,
the rotor core comprises:
a ring-shaped inner core portion disposed on a radially inner side of the plurality magnets;
an outer core portion disposed on a radially outer side of the inner core portion; and
a plurality of connecting portions connecting the outer core portion and the inner core portion in a radial direction,
the outer core portion having a plurality of outer core elements which are connected to the inner core portion through the plurality of connecting portions, and
the resin portion comprises:
an upper resin portion covering at least a part of a top surface of the rotor core and at least a part of a top surface of each magnet; and
a lower resin portion covering at least a part of a bottom surface of the rotor core and at least a part of a bottom surface of each magnet,
the upper resin portion including a plurality of gate holes for insert molding of the resin portion, and
the lower resin portion comprising:
a first core support mark exposing a part of the bottom surface of the rotor core in a more radially inner side from the plurality of outer core elements; and
a second core support mark exposing a part of the bottom surface of the rotor core in the outer core portion.

2. The motor according to claim 1 ,
wherein each of the plurality of first core support marks overlap with a part of any one of the connecting portions.

3. The motor according to claim 1 ,
wherein the plurality of gate holes are disposed between the plurality of first core support marks and the plurality of second core support marks in the radial direction.

4. The motor according to claim 2 ,
wherein the plurality of gate holes are disposed between the plurality of first core support marks and the plurality of second core support marks in the radial direction.

5. The motor according to claim 1 ,
wherein each of the circumferential center position of the plurality of gate holes and the plurality of first core support marks axially overlaps with a center-line which extends in the radial direction via the circumferential center position of any one of the connecting portions.

6. The motor according to claim 2 ,
wherein each of the circumferential center position of the plurality of gate holes and the plurality of first core support marks axially overlaps with a center-line which extends in the radial direction via the circumferential center position of any one of the connecting portions.

7. The motor according to claim 3 ,
wherein each of the circumferential center position of the plurality of gate holes and the plurality of first core support marks axially overlaps with a center-line which extends in the radial direction via the circumferential center position of any one of the connecting portions.

8. The motor according to claim 1 ,
wherein the radius of the rotor core is longer than the axial thickness of the rotor core.

9. The motor according to claim 2 ,
wherein the radius of the rotor core is longer than the axial thickness of the rotor core.

10. The motor according to claim 3 ,
wherein the radius of the rotor core is longer than the axial thickness of the rotor core.

11. The motor according to claim 4 ,
wherein the radius of the rotor core is longer than the axial thickness of the rotor core.

12. The motor according to claim 5 ,
wherein the radius of the rotor core is longer than the axial thickness of the rotor core.

13. The motor according to claim 1 ,
wherein the resin portion further comprises a ring-shaped inner circumferential resin portion which covers the inner circumferential surface of the rotor core,
the upper resin portion and the lower resin portion are continuously connected to the inner circumferential resin portion, and
the bearing mechanism or the shaft is retained in the inner circumferential resin portion.

14. The motor according to claim 2 ,
wherein the resin portion further comprises a ring-shaped inner circumferential resin portion which covers the inner circumferential surface of the rotor core,
the upper resin portion and the lower resin portion are continuously connected to the inner circumferential resin portion, and
the bearing mechanism or the shaft is retained in the inner circumferential resin portion.

15. The motor according to claim 3 ,
wherein the resin portion further comprises a ring-shaped inner circumferential resin portion which covers the inner circumferential surface of the rotor core,
the upper resin portion and the lower resin portion are continuously connected to the inner circumferential resin portion, and
the bearing mechanism or the shaft is retained in the inner circumferential resin portion.

16. The motor according to claim 4 ,
wherein the resin portion further comprises a ring-shaped inner circumferential resin portion which covers the inner circumferential surface of the rotor core,
the upper resin portion and the lower resin portion are continuously connected to the inner circumferential resin portion, and
the bearing mechanism or the shaft is retained in the inner circumferential resin portion.

17. The motor according to claim 5 ,
wherein the resin portion further comprises a ring-shaped inner circumferential resin portion which covers the inner circumferential surface of the rotor core,
the upper resin portion and the lower resin portion are continuously connected to the inner circumferential resin portion, and
the bearing mechanism or the shaft is retained in the inner circumferential resin portion.

18. The motor according to claim 1 ,
wherein the stationary unit is provided with a shaft,
the bearing mechanism is provided with an upper bearing and a lower bearing,
the resin portion further comprises a ring-shaped inner circumferential resin portion which covers at least a portion of the inner circumferential surface of the rotor core,
the inner circumferential resin portion is continuously connected to at least one of the upper resin portion and the lower resin portion, and
one of the upper bearing and the lower bearing is retained in the inner circumferential resin portion.

19. The motor according to claim 2 ,
wherein the stationary unit is provided with a shaft,
the bearing mechanism is provided with an upper bearing and a lower bearing,
the resin portion further comprises a ring-shaped inner circumferential resin portion which covers at least a portion of the inner circumferential surface of the rotor core,
the inner circumferential resin portion is continuously connected to at least one of the upper resin portion and the lower resin portion, and
one of the upper bearing and the lower bearing is retained in the inner circumferential resin portion.

20. The motor according to claim 3 ,
wherein the stationary unit is provided with a shaft,
the bearing mechanism is provided with an upper bearing and a lower bearing,
the resin portion further

Assignees

• Nidec Corp

Inventors

• Furutachi Eiji

Classifications

• H02K5/1735

  radially supporting the rotary shaft at only one end of the rotor (H02K5/1737 takes precedence) · CPC title

• H02K1/30

  using intermediate parts, e.g. spiders · CPC title

• H02K5/161 Primary

  radially supporting the rotary shaft at both ends of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence) · CPC title

• H02K9/06

  with fans or impellers driven by the machine shaft · CPC title

• H02K11/0068

  Electricity · mapped topic