# US 5,708,318 A · AC generator

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- Number: US 5,708,318 A
- Document ID: US5708318A
- Status: Granted
- Kind: A
- Application number: 08/796,952
- Filed: 1997-02-07
- Granted: 1998-01-13
- Earliest claimed: 1996-02-09
- Assignees: Denso Corporation
- Inventors: Kiyoshi Fudono
- Web page: https://patentgrep.com/patent/US5708318A

## CPC

- H02K 1/243: {of the claw-pole type}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

An AC generator includes a rotor composed of a pair of generally cylindrical pole cores each having a plurality of claw poles. The claw poles have first and second chamfers disposed respectively on both leading and trailing sides thereof. A ratio b/a between a circumferential width a of the first chamfer and a circumferential width b of the second chamfer is in a range from 2.5 to 5.0, and a chamfered angle .theta.r.degree. of the second chamfer is in a range from 60.degree. to 75.degree..

## Claims

### Claim 1

An AC generator including a stator, a rotor composed of a generally cylindrical pole core having a plurality of claw poles facing said stator for supplying magnetic field to said stator, wherein
said claw poles have first and second chamfers disposed respectively on both leading and trailing sides thereof;
a ratio b/a between a circumferential width a of said first chamfer and a circumferential width b of said second chamfer is in a range from 2.5 to 5.0; and
a chamfered angle .theta.r.degree. of said second chamfer is in a range from 60.degree. to 75.degree..

### Claim 2 (depends on 1)

An AC generator as claimed in claim 1, wherein
said first and second chamfers of said pole cores have a draft tapering off to edges of said claw poles.

### Claim 3 (depends on 2)

An AC generator as claimed in claim 2, wherein said claw poles have trapezoidal surface; and
said first and second chamfers are wider at portions nearer the base portion of said claw poles.

### Claim 4 (depends on 2)

An AC generator as claimed in claim 2, said first and second chamfers are formed by cold forging.