US3619676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex servomotor
Assignee: Yaskawa Electric Corp
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Filing: 1970-03-24
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Granted: 1971-11-09
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Expires: 1990-03-24
Abstract
Abstract A duplex servomotor suitable for use in machine tools requiring automatic position control, feed control and the like, and other applications, which comprises a constant speed AC motor adapted to be coupled with a load to drive said load and a low-inertia DC servomotor adapted to be coupled with said load through speed reduction means and clutch means. The AC motor and DC motor are combined and arranged as a compact unit in a machine frame so that high-speed operation and low-speed operation can be independently transmitted to the load according to requirement.
Inventors
- 👤 Hiroshi Kawakami
- 👤 Juichi Tatsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:15
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/20; H02K7/10; H02K7/12; H02K7/125
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A duplex servomotor which comprises: a constant speed AC motor having a fixed stator and an axially movable rotor; a load shaft coupled to said rotor; means urging said rotor axially from said stator to shift said rotor from said stator when said AC motor is deenergized; a DC servomotor; and clutch means interposed between said AC motor and said DC motor adapted to connect said DC motor to said load shaft when said AC motor rotor is shifted axially.
Claim 2
Dependent Claim
80 words
A duplex servomotor which comprises: a constant speed AC motor having a fixed stator and an axially movable rotor; a load shaft coupled to said rotor; means urging said rotor axially from said stator to shift said rotor from said stator when said AC motor is deenergized; a DC servomotor; and clutch means interposed between said AC motor and said DC motor adapted to connect said DC motor to said load shaft when said AC motor rotor is shifted axially.
Claim 3
Dependent Claim
48 words
A duplex servomotor as claimed in claim 1, wherein the AC motor is a cone-rotor type AC motor having an axially shiftable rotary shaft connected to said clutch means and being shifted axially by said urging means to engage said clutch means upon deenergization of said AC motor.
Claim 4
Dependent Claim
16 words
A duplex servomotor as claimed in claim 1, wherein the DC motor is a printed-circuit-type motor.
Claim 5
Dependent Claim
27 words
A duplex servomotor according to claim 1 wherein said AC motor is an axial airgap-type motor and its rotor is a driven member of said clutch means.
Claim 6
Dependent Claim
19 words
A duplex servomotor according to claim 1 further including speed reduction means coupling said DC motor and clutch means.
Claim 7
Dependent Claim
15 words
A duplex servomotor according to claim 1 wherein said motors are arranged in axial alignment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |