Armature and motor

Patent metadata

Field	Value
Publication number	US-9088191-B2
Application number	US-201213714775-A
Country	US
Kind code	B2
Filing date	Dec 14, 2012
Priority date	Jan 31, 2012
Publication date	Jul 21, 2015
Grant date	Jul 21, 2015

Abstract

An insulator of an armature includes an upper resin member and a lower resin member. Each of the upper and lower resin members includes decreased thickness portions. Axial positions of the decreased thickness portions of the upper and lower resin members are arranged to overlap at least partially with each other. Each of the upper and lower resin members further includes a rib arranged to project from a corresponding one of the decreased thickness portions. The rib improves the strength of the corresponding decreased thickness portion and reduces the likelihood that any of the decreased thickness portions of the upper and lower resin members will be damaged when the two members are fitted to each other.

First claim

What is claimed is:

1. An armature comprising:
a core back;
a plurality of teeth arranged to extend radially inward or radially outward from the core back;
insulators, each of which is arranged to cover a separate one of the teeth; and
coils, each of which is defined by a conducting wire wound around a separate one of the insulators; wherein
each insulator includes an upper resin member and a lower resin member;
the upper resin member includes:
a top plate portion arranged to cover an upper surface of a corresponding one of the teeth;
a pair of upper side wall portions, each of which is arranged to extend downward from a separate circumferential end portion of the top plate portion to cover an upper region of a separate one of circumferential side surfaces of the tooth;
a pair of first upper decreased thickness portions, each of which is arranged to extend further downward from a lower end portion of a separate one of the upper side wall portions, each of the pair of first upper decreased thickness portions having a circumferential thickness smaller than that of each upper side wall portion; and
a first upper rib;

the lower resin member includes:
a bottom plate portion arranged to cover a lower surface of the tooth;
a pair of lower side wall portions, each of which is arranged to extend upward from a separate circumferential end portion of the bottom plate portion to cover a lower region of a separate one of the circumferential side surfaces of the tooth;
a pair of first lower decreased thickness portions, each of which is arranged to extend further upward from an upper end portion of a separate one of the lower side wall portions, each of the pair of first lower decreased thickness portions having a circumferential thickness smaller than that of each lower side wall portion; and
a first lower rib;

an axial position of each of the first upper decreased thickness portions and the first upper rib is arranged to overlap at least partially with an axial position of each of the first lower decreased thickness portions and the first lower rib;
the first upper rib is arranged to project in a circumferential direction from a surface of a corresponding one of the first upper decreased thickness portions toward a corresponding one of the first lower decreased thickness portions;
the first lower rib is arranged to project in the circumferential direction from a surface of a corresponding one of the first lower decreased thickness portions toward a corresponding one of the first upper decreased thickness portions;
each of the circumferential thickness of each first upper decreased thickness portion and a combined circumferential thickness of the first upper decreased thickness portion and the first upper rib is arranged to decrease with decreasing height or to be uniform;
each of the circumferential thickness of each first lower decreased thickness portion and a combined circumferential thickness of the first lower decreased thickness portion and the first lower rib is arranged to decrease with increasing height or to be uniform;
a radial width of the first upper rib is arranged to decrease with decreasing height or to be uniform; and
a radial width of the first lower rib is arranged to decrease with increasing height or to be uniform.

2. The armature according to claim 1 , wherein
the first upper rib and the corresponding first lower decreased thickness portion are circumferentially opposed to each other;
the first lower rib and the corresponding first upper decreased thickness portion are circumferentially opposed to each other; and
the first upper rib and the first lower rib are arranged radially adjacent to each other.

3. The armature according to claim 1 , wherein
the upper surface of the tooth and a lower surface of the top plate portion are arranged to be in contact with each other; and
the lower surface of the tooth and an upper surface of the bottom plate portion are arranged to be in contact with each other.

4. The armature according to claim 3 , wherein
a lower end of each of the first upper rib and the first upper decreased thickness portions is axially opposed to an upper end of a corresponding one of the lower side wall portions with a gap intervening therebetween; and
an upper end of each of the first lower rib and the first lower decreased thickness portions is axially opposed to a lower end of a corresponding one of the upper side wall portions with a gap intervening therebetween.

5. The armature according to claim 1 , wherein
a total number of first upper ribs included in the upper resin member is more than one; and
a total number of first lower ribs included in the lower resin member is more than one.

6. The armature according to claim 5 , wherein
the upper surface of the tooth and a lower surface of the top plate portion are arranged to be in contact with each other;
the lower surface of the tooth and an upper surface of the bottom plate portion are arranged to be in contact with each other;
a radial interval between adjacent ones of the first upper ribs is arranged to be greater than a radial dimension of each individual first lower rib; and
a radial interval between adjacent ones of the first lower ribs is arranged to be greater than a radial dimension of each individual first upper rib.

7. The armature according to claim 1 , wherein
one of the pair of first lower decreased thickness portions arranged on both circumferential sides of the tooth is arranged between the tooth and one of the pair of first upper decreased thickness portions arranged on both circumferential sides of the tooth; and
another one of the pair of first upper decreased thickness portions arranged on both circumferential sides of the tooth is arranged between the tooth and the another one of the pair of first lower decreased thickness portions arranged on both circumferential sides of the tooth.

8. The armature according to claim 6 , wherein
one of the pair of first lower decreased thickness portions arranged on both circumferential sides of the tooth is arranged between the tooth and one of the pair of first upper decreased thickness portions arranged on both circumferential sides of the tooth; and
another one of the pair of first upper decreased thickness portions arranged on both circumferential sides of the tooth is arranged between the tooth and the another one of the pair of first lower decreased thickness portions arranged on both circumferential sides of the tooth.

9. The armature according to claim 1 , wherein
the first upper rib and the corresponding first lower decreased thickness portion include a pair of opposed surfaces parallel or substantially parallel to each other; and
the first lower rib and the corresponding first upper decreased thickness portion include a pair of opposed surfaces parallel or substantially parallel to each other.

10. The armature according to claim 1 , wherein
the first upper rib includes an upper tapered surface provided at a lower end portion of a surface thereof opposed to the corresponding first lower decreased thickness portion, the upper tapered surface becoming progressively more distant from the corresponding first lower decreased thickness portion with decreasing height; and
the first lower rib includes a lower tapered surface provided at an upper end portion of a surface thereof opposed to the corresponding first upper decreased thickness portion, the lower tapered surface becoming progressively more distant from the corresponding first upper decreased thickness portion with increasing height.

11. The armature according to claim 1 , wherein a radial width of the rib projecting from one of the first upper d

Assignees

• Nidec Corp

Inventors

• Yokogawa Tomoyoshi

Classifications

• H02K3/30

  Windings characterised by the insulating material · CPC title

• H02K3/325

  for windings on salient poles, such as claw-shaped poles · CPC title

• H02K2203/12

  Machines characterised by the bobbins for supporting the windings · CPC title

• H02K3/46

  Fastening of windings on the stator or rotor structure · CPC title

• H02K3/522 Primary

  for generally annular cores with salient poles · CPC title