US4967128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo motor control device
Assignee: Omron Corp
•
Filing: 1989-11-01
•
Granted: 1990-10-30
•
Expires: 2009-11-01
Abstract
Abstract A servo motor control device as provided in which the torque indication signal is not effected by the speed of rotation of the motor. This is accomplished by providing a torque corrector for converting an output of a speed detector into a torque correction signal. A subtractor is used for outputting the difference between a current instruction signal and the torque correction signal. The output of the subtractor is used as the torque indication signal.
Inventors
- 👤 Kenji Sawai
- 👤 Jinichi Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:26
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
In a servo motor control device for an electric motor of the type having a speed detector for detecting the speed of rotation of said electric motor; a proportional integral (PI) compensator for receiving a difference between a speed instruction signal and said detected speed in order to output a current instruction signal; a current detector for detecting current flowing in said motor; and a current amplifier for receiving an input comprising said current instruction signal minus an output of said current detector minus a counter electromotive voltage, to apply current to a coil of said motor, the improvement comprising: a torque corrector for converting said output of said speed detector into a torque correction signal; and a subtractor for outputting a difference between said current instruction signal and said torque correction signal, an output of said subtractor being employed as a torque indication signal.
Claim 2
Dependent Claim
145 words
In a servo motor control device for an electric motor of the type having a speed detector for detecting the speed of rotation of said electric motor; a proportional integral (PI) compensator for receiving a difference between a speed instruction signal and said detected speed in order to output a current instruction signal; a current detector for detecting current flowing in said motor; and a current amplifier for receiving an input comprising said current instruction signal minus an output of said current detector minus a counter electromotive voltage, to apply current to a coil of said motor, the improvement comprising: a torque corrector for converting said output of said speed detector into a torque correction signal; and a subtractor for outputting a difference between said current instruction signal and said torque correction signal, an output of said subtractor being employed as a torque indication signal.
Claim 3
Dependent Claim
31 words
A servo motor control device as claimed in claim 1, wherein said torque corrector multiplies said output of said speed detector by a correcting factor to obtain said torque correction signal.
Claim 4
Dependent Claim
22 words
A servo motor control device as claimed in claim 2, wherein said torque correction signal is proportional to said counter electromotive voltage.
Claim 5
Independent Claim
109 words
A method of controlling an electric servo motor comprising the following steps: detecting the speed of rotation of said electric motor; receiving a difference between a speed instruction signal and said detected speed output; determining an output current instruction signal from said received difference; detecting a current flowing in said motor; receiving an input comprising said current instruction signal minus said detected current minus a counter electromotive voltage; applying current to a coil of said motor; converting said output of said speed detector into a torque correction signal; and outputting a difference between said current instruction signal and said torque correction signal for use as a torque indication signal.
Claim 6
Independent Claim
109 words
A method of controlling an electric servo motor comprising the following steps: detecting the speed of rotation of said electric motor; receiving a difference between a speed instruction signal and said detected speed output; determining an output current instruction signal from said received difference; detecting a current flowing in said motor; receiving an input comprising said current instruction signal minus said detected current minus a counter electromotive voltage; applying current to a coil of said motor; converting said output of said speed detector into a torque correction signal; and outputting a difference between said current instruction signal and said torque correction signal for use as a torque indication signal.
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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |