Rotary electric machine having coaxial output hollow shaft with reduction gear and slip ring

• US 20010052735A1
• Filed: 04/06/2001
• Published: 12/20/2001
• Est. Priority Date: 04/07/2000
• Status: Active Grant

• Current Assignee: Japan Servo Co., Ltd. (Nidec Corporation)
• Original Assignee: Japan Servo Co., Ltd. (Nidec Corporation)
• Inventors: Sakamoto, Masafumi
• Granted Patent: US 6,477,918 B2
• Time in Patent Office: Days
• US Class Current: 310/75.00R
• CPC Class Codes: F16H 1/28 with gears having orbital motion
• CPC Class Codes: F16H 49/001 Wave gearings, e.g. harmonic drive transmissions harmonic drives specially adapted for positioning programme-controlled manipulators B25J9/1025
• CPC Class Codes: F16M 11/10 around a horizontal axis F16M11/12 takes precedence
• CPC Class Codes: F16M 11/18 with mechanism for moving the apparatus relatively to the stand
• CPC Class Codes: F16M 11/2014 around a vertical axis F16M11/2035 takes precedence
• CPC Class Codes: F16M 13/00 Other supports for positioning apparatus or articles heads thereof F16M11/02 ; undercarriages thereof F16M11/20 ; adapted to be stuck in the ground A45F3/44 ; sockets or holders for poles or posts E04H12/22; Means for steadying hand-held apparatus or articles supports for measuring instruments G01D11/30; supports for casings of remote control switching devices H01H9/025
• CPC Class Codes: F16M 13/027 Ceiling supports
• CPC Class Codes: H02K 13/003 Structural associations of slip-rings
• CPC Class Codes: H02K 5/141 for cooperation with slip-rings
• CPC Class Codes: H02K 7/116 with gears
• CPC Class Codes: Y10T 74/19 Gearing

Abstract

To drive an actuator which is optimum for and practical in use as a three-dimensionally positioning apparatus for a monitoring camera, a disco-lighting, an antenna, a multi-axis (multi-articular) robot, etc., there is provided an inner rotor type rotary electric machine having a coaxial output hollow shaft with a reduction gear and a slip ring, comprising: a hollow rotation shaft; a reduction gear for reducing an output of the inner rotor type rotary electric machine and extracting an output through a hollow shaft of the reduction gear coaxially with the hollow rotation shaft; and a slip ring provided in a hollow portion or an output portion of the reduction gear. Instead of the inner rotor type rotary electric machine, a similar outer rotor type rotary electric machine may be used.

Claims

1. An inner rotor type rotary electric machine having a coaxial output hollow shaft with a reduction gear and a slip ring, comprising:

a hollow rotation shaft;

a reduction gear for reducing an output of said inner rotor type rotary electric machine and extracting an output through a hollow shaft of said reduction gear coaxially with said hollow rotation shaft; and

a slip ring provided in a hollow portion or an output portion of said reduction gear.

3. A rotary electric machine having a coaxial output hollow shaft with a reduction gear and a slip ring according to

claim 1

or

2

, wherein said rotary electric machine is a stepping motor.

4. A rotary electric machine having a coaxial output hollow shaft with a reduction gear and a slip ring according to

claim 1

or

2

, wherein at least one of a position sensor and a speed sensor is provided in said hollow portion or said output portion of said reduction gear along with said slip ring.

5. A driving device for performing three-dimensional positioning, comprising:

a rotary electric machine having a coaxial output hollow shaft with a reduction gear and a slip ring as defined in

claim 1

or

2

; and

means for performing giving and receiving electric power through said slip ring so that said driving device is driven.

6. A rotary electric machine according to

claim 1

or

2

, wherein said reduction gear is a harmonic reduction gear constituted by an output gear which has internal gear teeth and an inner gear which is made of a flexible material and in gear with said output gear, said inner gear having gear teeth on an outer circumference thereof, the number of said gear teeth of said inner gear being set so as to be smaller than said internal gear teeth, an inner circumference of said inner gear being forced to form an ellipse so that said inner circumference of said inner gear is drawn by a longer axis of said ellipse to make said gear teeth of said inner gear comes to be in gear with said gear teeth of said output gear.

7. A multi-axis positioning device comprising:

at least one rotary electric machine defined in

claim 1

or

2

; and

means for performing giving and receiving electric power through said slip ring so that said multi-axis positioning device is driven.

2. An outer rotor type rotary electric machine having a coaxial output hollow shaft with a reduction gear and a slip ring, comprising:

a hollow rotation shaft;

a reduction gear for reducing an output of said outer rotor type rotary electric machine and extracting an output through a hollow shaft of said reduction gear coaxially with said hollow rotation shaft; and

a slip ring provided in a hollow portion or an output portion of said reduction gear.