# US 6,724,115 B2 · High electrical and mechanical response structure of motor-generator

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- Number: US 6,724,115 B2
- Document ID: US6724115B2
- Status: Granted
- Kind: B2
- Application number: 10/269,881
- Filed: 2002-10-15
- Published: 2003-06-05
- Granted: 2004-04-20
- Earliest claimed: 2001-10-24
- Assignees: Denso Corporation
- Inventors: Shin Kusase
- Web page: https://patentgrep.com/patent/US6724115B2

## CPC

- H02K 21/38: with rotating flux distributors, and armatures and magnets both stationary
- H02K 1/27: Rotor cores with permanent magnets
- H02K 21/04: Windings on magnets for additional excitation {; Windings and magnets for additional excitation}
- 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 motor-generator includes a rotor made up of a first inductor core and a second inductor core arrayed in an axial direction of a rotary shaft. A plurality of permanent magnets are arrayed at an interval of 2π in electrical angle of an armature away from each other in the periphery of each of the first and second inductor cores. Each permanent magnet is magnetized in a radius direction of the first and second inductor cores so as to be opposed to a magnetomotive force produced by a field winding, thereby resulting in quick disappearance of the magnetic flux of the field upon disappearance of the magnetomotive force from the field winding.

## Claims

### Claim 1

A motor generator comprising:
an armature including polyphase windings;
a field core;
a field winding wound around said field core;
a pole rotor disposed between said armature and said field core to be rotatable together with a rotary shaft, said pole rotor being made up of a first inductor core and a second inductor core arrayed adjacent each other in an axial direction of the rotary shaft; and
a plurality of permanent magnets arrayed at an interval of 2π in electrical angle of said armature away from each other in each of the first and second inductor cores of said pole rotor in a circumferential direction of the first and second inductor cores, each of the permanent magnets being magnetized in a radius direction of the first and second inductor cores so as to be opposed to a magnetomotive force produced by said field winding.

### Claim 2 (depends on 1)

A motor generator as set forth in claim 1, further comprising a plurality of slits formed in each of the first and second inductor cores, each of the slits extending in the radius direction of the first and second inductor cores and being located between adjacent two of said permanent magnets.

### Claim 3 (depends on 2)

A motor generator as set forth in claim 2, wherein said slits are arrayed at an interval of 2π in electrical angle of said armature from each other.

### Claim 4 (depends on 1)

A motor generator as set forth in claim 1, further comprising a housing to which said pole rotor is fixedly attached to form a brushless magnetic circuit, and wherein each of said permanent magnets is located closer to said armature than said field core in the radius direction of the first and second inductor cores.

### Claim 5 (depends on 1)

A motor generator as set forth in claim 1, wherein said field core is made up of a boss around which said field winding is wound and discs attached to ends of the boss opposed to each other in the axial direction of the rotary shaft, and further comprising hollow cylinders which are disposed on peripheries of the discs, respectively, and each of which has a length greater than a thickness of the discs in the axial direction of the rotary shaft.

### Claim 6 (depends on 5)

A motor generator as set forth in claim 5, wherein each of the discs extends radially from peripheral edges of the boss to define a gap within which said field winding is installed, each of said hollow cylinders extending over the gap close to each other through a given interval.

### Claim 7 (depends on 1)

A motor generator as set forth in claim 1, further comprising a second permanent magnet which is disposed between the first and second inductor cores of said pole rotor, said second permanent magnet being magnetized so as to be opposed to the magnetomotive force produced by said field winding.

### Claim 8 (depends on 1)

A motor generator as set forth in claim 1, wherein said field core is made up of a boss around which said field winding is wound and discs attached to ends of the boss opposed to each other in the axial direction of the rotary shaft, and further comprising a magnetic flux leakage deterrent permanent magnet disposed between said field winding and said pole rotor which is so magnetized as to decrease a leakage of magnetic flux into between the discs of said field core.

### Claim 9 (depends on 1)

A motor generator as set forth in claim 1, further comprising a control circuit which works to energize said field winding and change a direction in which said field winding is energized.