MOTOR

• US 20190280552A1
• Filed: 10/25/2017
• Published: 09/12/2019
• Est. Priority Date: 10/26/2016
• Status: Active Grant

• Current Assignee: Nidec Sankyo Corporation (Nidec Corporation)
• Original Assignee: Nidec Sankyo Corporation (Nidec Corporation)
• Inventors: KURATANI, Hiroki, YAMAMOTO, Takashi
• Granted Patent: US 11,088,587 B2
• Time in Patent Office: Days
• CPC Class Codes: F04D 13/06 the pump being electrically driven
• CPC Class Codes: F04D 13/0606 Canned motor pumps
• CPC Class Codes: F04D 29/426 especially adapted for liquid pumps
• CPC Class Codes: F16B 7/20 using bayonet connections
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 15/125 Heating or drying of machines in operational state, e.g. standstill heating
• CPC Class Codes: H02K 5/02 Casings or enclosures characterised by the material thereof
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 5/124 Sealing of shafts
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

A motor provided with: a resin sealing member that is made from a resin and that covers a stator; and a cover member that is fixed to the resin sealing member. The protrusions protruding radially outward are formed on the resin sealing member. A part of the cover member on a Z2 direction side thereof is configured as a cylindrical cover section covering the resin sealing member from the outer circumferential side. The cover section has formed therein notch sections, engagement grooves that extend toward one side in the circumferential direction from the ends of the notch sections on a Z1 direction side and with which the protrusions engage, and a stopper restricting movement of the cover member toward the other side in the circumferential direction. The widths of the notch sections are wider than the widths of the protrusions in the circumferential direction.

Claims

1. A motor comprising:

a rotor having a rotation shaft and a drive magnet;

a stator which is formed in a tube shape and is disposed on an outer peripheral side of the rotor;

a resin sealing member made of a resin, wherein one direction in an axial direction of the rotor is referred to as a first direction and a direction opposite to the first direction is referred to as a second direction, and the resin sealing member at least covers a side in the second direction of the stator and the outer peripheral side of the stator; and

a cover member which is fixed to an end side in the first direction of the resin sealing member and supports the rotation shaft,

wherein the resin sealing member is formed with a plurality of protrusions which protrude from an outer peripheral face of the resin sealing member toward an outer side in a radial direction of the rotor,

wherein a portion of the cover member on a side in the second direction is formed to be a cover part in a tube shape which covers the resin sealing member from an outer peripheral side,

wherein the cover part is formed with

a plurality of notch sections which are cut out from an end in the second direction of the cover part to the first direction,

a plurality of engagement grooves which extend to one side in a circumferential direction of the rotor from respective end sides in the first direction of the plurality of notch sections and are respectively engaged with the plurality of protrusions, and

a stopper which restricts a movement of the cover member to the other side in the circumferential direction in a state in which the protrusions are engaged with the engagement grooves, and

wherein a width in the circumferential direction of each of the notch sections is wider than a width in the circumferential direction of each of the protrusions.

2. The motor according to claim 1, wherein

the stopper is formed on an other end side in the circumferential direction of one of the engagement grooves, and

when the engagement groove where the stopper is formed is referred to as a first engagement groove, the cover part is formed with a plurality of connected parts each of which connects both ends in the axial direction on the other side in the circumferential direction of each of the engagement grooves other than the first engagement groove.

3. The motor according to claim 2, wherein each of the plurality of connected parts connects both ends in the circumferential direction of each of the notch sections other than the notch section connecting the first engagement groove, and covers each of the notch sections other than the notch section connecting the first engagement groove from an outer side in the radial direction.

4. The motor according to claim 2, wherein

four of the protrusions are formed in the resin sealing member at a predetermined pitch in the circumferential direction,

four of the notch sections and four of the engagement grooves are formed in the cover part at the same pitch in the circumferential direction as the four of the protrusions,

when each of two of the engagement grooves adjacent to the first engagement groove in the circumferential direction is referred to as a second engagement groove, and the remaining engagement groove of the four of the engagement grooves other than the first engagement groove and the second engagement grooves is referred to as a third engagement groove, the cover member is positioned in the circumferential direction with respect to the resin sealing member by the protrusion engaged with the first engagement groove and the stopper and by the protrusion engaged with the third engagement groove and the third engagement groove, and

the cover member is positioned in the axial direction with respect to the resin sealing member by the protrusions engaged with the second engagement grooves and the second engagement grooves and by the protrusion engaged with the third engagement groove and the third engagement groove.

5. The motor according to claim 1, wherein at least one of side faces on a first direction side of the engagement grooves and side faces on the second direction side of the engagement grooves is formed with a protruding part which protrudes in the axial direction.

6. The motor according to claim 1, wherein

the stator includes

a plurality of drive coils, and

a stator core provided with a plurality of salient pole parts each of which is wound with one of the plurality of drive coils and an outer peripheral ring part formed in a ring shape,

the plurality of salient pole parts protrude toward an inner side in the radial direction from the outer peripheral ring part,

an end face on the first direction side of the outer peripheral ring part and faces on the first direction side of the protrusions are formed to be flat faces perpendicular to the axial direction,

a part of the end face on the first direction side of the outer peripheral ring part is formed as an exposed face which is not covered by the resin sealing member, and

the faces on the first direction side of the protrusions and the exposed face are disposed on the same plane.

7. The motor according to claim 1, wherein

the cover member is formed with a circular ring-shaped part in a circular ring shape which is disposed on an inner side in the radial direction with respect to the cover part, and

a portion of the resin sealing member on the first direction side is formed with a contact face with which an outer peripheral face of the circular ring-shaped part comes in contact in the radial direction.

8. The motor according to claim 1, wherein

an adhesive filling space into which an adhesive is filled is formed in the radial direction between an outer peripheral face of the resin sealing member on the first direction side with respect to the protrusions and an inner peripheral face of the cover part on the first direction side with respect to the protrusions, and

the adhesive is filled in the adhesive filling space.

9. A motor comprising:

a rotor having a rotation shaft and a drive magnet;

a stator which is formed in a tube shape and is disposed on an outer peripheral side of the rotor;

a resin sealing member made of a resin, wherein one direction in an axial direction of the rotor is referred to as a first direction and a direction opposite to the first direction is referred to as a second direction, and the resin sealing member at least covers a side in the second direction of the stator and the outer peripheral side of the stator; and

a cover member which is fixed to an end side in the first direction of the resin sealing member and supports the rotation shaft,

wherein, in the resin sealing member, a first opposite face facing the cover member is formed over an entire area of the rotor in a circumferential direction,

in the cover member, a second opposite face facing the first opposite face is formed over the entire area in the circumferential direction, and

an intrusion restraint member is disposed between the first opposite face and the second opposite face to restrain entry of fluid into an inner peripheral side of the stator.

10. The motor according to claim 9, wherein

the second opposite face is disposed on the first direction side of the first opposite face, and

the first opposite face faces the second opposite face in the axial direction.

11. The motor according to claim 9, wherein

a portion of the cover member on a side in the second direction is formed to be a cover part in a tube shape which covers the resin sealing member from an outer peripheral side,

at least a part of an inner peripheral side of the cover part is formed to be the second opposite face, and

at least a part of the outer peripheral side of the resin sealing member is formed to be a first opposite face, and

the first opposite face faces the second opposite face in a radial direction of the rotor.

12. The motor according to claim 9, wherein

a portion of the cover member on a side in the second direction is formed to be a cover part in a tube shape which covers the resin sealing member from an outer peripheral side,

a part of the second opposite face is disposed on a side of a first direction of a part of the first opposite face,

at least a part of an inner peripheral face of the cover part is formed to be another part of the second opposite face,

at least a part of an outer peripheral face of the resin sealing member is formed to be another part of the first opposite face, and

the first opposite face faces the second opposite face in the axial direction and in the radial direction of the rotor.

13. The motor according to claim 9, wherein

the resin sealing member is formed with a first contact face that contacts the cover member in the axial direction,

the cover member is formed with a second contact face that contacts the first contact face,

the first opposite face and the second opposite face are disposed on a side in the first direction with respect to the first contact face and the second contact face, and

an arrangement space in which the intrusion restraint member is disposed is formed between the first opposite face and the second opposite face.

14. The motor according to claim 9, wherein the intrusion restraint member is an adhesive.

15. The motor according to claim 9, wherein the intrusion restraint member is a semi-solid composition having no adhesiveness.

16. The motor according to claim 9, wherein the intrusion restraint member is a sealing member formed of an elastic member and formed in an annular shape.

17. The motor according to claim 13, wherein

an outer peripheral face of the resin sealing member includes a large diameter outer peripheral face and a small diameter outer peripheral face, wherein the large diameter outer peripheral face is a second direction side portion of the outer peripheral face of the resin sealing member, the small diameter outer peripheral face is a first direction side portion of the outer peripheral face of the resin sealing member and has a smaller outer diameter than the large diameter outer peripheral face,

a boundary portion between the large diameter outer peripheral face and the small diameter outer peripheral face is formed with a first contact face orthogonal to the axial direction and in contact with the cover member in the axial direction,

a portion of the cover member on a side in the second direction is formed to be a cover part in a tube shape which covers the resin sealing member from an outer peripheral side,

the inner peripheral face of the cover part includes a large diameter inner peripheral face and a small diameter inner peripheral face, wherein the large diameter inner peripheral face is a second direction side portion of an inner peripheral face of the cover part, the small diameter inner peripheral face is a first direction side portion of the inner peripheral face of the cover part and has a smaller inner diameter than the large diameter outer peripheral face,

a boundary portion between the large diameter inner peripheral face and the small diameter inner peripheral face is formed with the second contact face orthogonal to the axial direction and in contact with the first contact face,

the small diameter outer peripheral face is formed to be the first opposite face,

the small diameter inner peripheral face is formed to be the second opposite face, and

the arrangement space in which the intrusion restraint member is disposed is formed between the first opposite face and the second opposite face.