IP Library › Granted Patent US 12676515
Granted Patent B2
US 12676515 · App. 19/114,927 · Granted Jul 7, 2026

Rotary electric machine

Inventors: Taku Uematsu (Tokyo, JP); Shigeo Sakurai (Tokyo, JP)
Assignee: MEIDENSHA CORPORATION
H02K1/165H02K3/24H02K3/30H02K3/345
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Quick Facts
Patent No.
US 12676515
App. No.
19/114,927
Granted
Jul 7, 2026
Kind
B2
Abstract

A rotary electric machine comprises a rotor and a stator, wherein one of the rotor and the stator includes: a groove portion that is formed on a circumferential surface facing the other of the rotor and the stator and extends in a direction that intersects with a circumferential direction, and a covering portion made of resin that covers the groove portion. The groove portion includes a retention portion that is formed such that a groove width at a second position is wider than a groove width at a first position, wherein the second position is separated in a radial direction from an opening farther than the first position. The retention portion is configured so as to prevent removal of the covering portion by engaging with resin material that is filled in the groove portion.

Claims (24)

1 . A rotary electric machine comprising a rotor and a stator, wherein each of the rotor and the stator include:

a groove portion that is formed on a circumferential surface and extends in a direction that intersects with a circumferential direction, and

a covering portion made of resin that covers the groove portion, wherein

the groove portion includes a retention portion that is formed such that a groove width at a second position is wider than a groove width at a first position, wherein the second position is separated in a radial direction from an opening farther than the first position, and wherein a groove width at the opening is wider than the groove width at the first position and the groove width at the second position, and

the retention portion is configured to prevent removal of the covering portion by engaging with resin material that is filled in the groove portion.

2 . The rotary electric machine according to claim 1 , wherein

the groove portion is formed at a tip end of a tooth portion of the stator, and

the covering portion is formed over the entire circumference on an inner peripheral side of the stator.

3 . The rotary electric machine according to claim 2 , wherein

the resin material of the covering portion further covers an inside of slots of the stator and insulates coils disposed in the slots from the stator.

4 . The rotary electric machine according to claim 3 , wherein

the slots include a flow passage for flowing a cooling medium at an outer-radial side of the coils.

5 . The rotary electric machine according to claim 2 , wherein

the tooth portion is a first tooth portion,

the rotary electric machine further comprises a second tooth portion, and

a slot is formed circumferentially between the first tooth portion and the second tooth portion.

6 . The rotary electric machine according to claim 5 , wherein

the grooves of the stator are formed circumferentially adjacent to the slot.

7 . The rotary electric machine according to claim 1 , wherein

the covering portion is a first covering portion that covers the groove portion of the rotor, and

the rotary electric machine further comprises a second covering portion that covers the groove portion of the stator, the second covering portion being different from the first covering portion.

8 . The rotary electric machine according to claim 1 , wherein

the covering portion is a first covering portion that covers an entire exterior circumference of the rotor, and

the rotary electric machine further comprises a second covering portion that covers an interior circumference of the stator.