# US 2012/0074820 A1 · Electromechanical device, actuator using the same, and motor

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- Number: US 2012/0074820 A1
- Document ID: US20120074820A1
- Status: Published application
- Kind: A1
- Application number: 13/236,967
- Filed: 2011-09-20
- Published: 2012-03-29
- Earliest claimed: 2010-09-24
- Assignees: Seiko Epson Corporation
- Inventors: Kesatoshi TAKEUCHI
- Web page: https://patentgrep.com/patent/US20120074820A1

## CPC

- H02K 7/116: with gears
- H02K 29/08: using magnetic effect devices, e.g. Hall-plates, magneto-resistors (H02K29/12 takes precedence)
- H02K 21/24: with magnets axially facing the armatures, e.g. hub-type cycle dynamos
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

An electromechanical device includes a central shaft; a rotor having a rotor magnet disposed along the periphery of the central shaft; a stator disposed on the periphery of the rotor; and a rotation mechanism connected to the rotor and used for transfer of a rotational driving force, wherein in the rotor, between the central shaft and the rotor magnet, a space which opens in at least one of an axial direction of the central shaft and houses at least part of the rotation mechanism is formed.

## Claims

### Claim 1

An electromechanical device, comprising:
a central shaft;
a rotor having a rotor magnet disposed along the periphery of the central shaft;
a stator disposed on the periphery of the rotor; and
a rotation mechanism connected to the rotor and used for transfer of a rotational driving force,
wherein
in the rotor, between the central shaft and the rotor magnet, a space which opens in at least one of an axial direction of the central shaft and houses at least part of the rotation mechanism is formed.

### Claim 2 (depends on 1)

The electromechanical device according to claim 1, wherein
the central shaft has a through hole extending in the axial direction of the central shaft, and
a conductive line sending electricity for controlling the rotation of the rotor is placed through the through hole.

### Claim 3 (depends on 1)

The electromechanical device according to claim 1, wherein
the rotation mechanism includes a planet gear having a sun gear integrally provided in the rotor and a planetary gear and an outer gear which are disposed in the space and functioning as a speed-increasing gear or a speed reducer.

### Claim 4 (depends on 1)

The electromechanical device according to claim 1, wherein
the rotation mechanism includes a harmonic drive mechanism having a wave generator integrally provided in the rotor and a flexible spline and a circular spline which are disposed in the space.

### Claim 5 (depends on 1)

An actuator comprising:
the electromechanical device according to claim 1.

### Claim 6 (depends on 2)

An actuator comprising:
the electromechanical device according to claim 2.

### Claim 7 (depends on 3)

An actuator comprising:
the electromechanical device according to claim 3.

### Claim 8 (depends on 4)

An actuator comprising:
the electromechanical device according to claim 4.

### Claim 9

A motor, comprising:
a central shaft;
a rotor having a rotor magnet disposed along the periphery of the central shaft; and
a stator disposed on the periphery of the rotor;
wherein
between the central shaft and the rotor magnet, a space which opens in at least one of an axial direction of the central shaft and houses at least part of a rotation mechanism connected to the rotor and used for transfer of a rotational driving force is formed.