US4995478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Start compensation device for elevators
Assignee: Otis Elevator Co
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Filing: 1989-04-20
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Granted: 1991-02-26
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Expires: 2009-04-20
Abstract
Abstract An elevator starting compensation device for performing starting compensation with addition of a load detection signal and a torque command signal comprising a speed command circuit, an automatic speed regulator amplifier for outputting the torque command signal, and a load detecting element for detecting load of a passenger cage, characterized in that it further includes a static frictional torque compensating element inputting a load detection signal and travel (lifting and lowering) signal and outputting a static frictional torque compensation signal predetermined according to the magnitude of the sensed passenger load, the torque compensation signal being added to the torque command signal so that start-up of actual speed is not delayed with respect to the speed command.
Inventors
- 👤 Kenji Oshima
- 👤 Yasutami Kito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:27
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
229 words
A start compensation device for an elevator motor controller performing start compensation by detecting a load of a passenger cage and adding a compensation signal corresponding to the detected load to a torque command signal, the elevator start compensation device comprising: a load sensor, for providing a load detection signal indicative of the load upon the elevator car; a speed sensor for providing a speed signal proportional to a rotating speed of the elevator motor; a speed command circuit, responsive to direction indicating command signals, for providing a speed command signal for commanding lifting and lowering of the elevator car at a selected speed; an automatic speed control amplifier, responsive to a signal having a magnitude indicative of a difference between said speed command signal and said speed signal, for providing a torque command signal; a static frictional torque compensator, responsive to said load detection signal and to said direction indicating command signals, for determining a static frictional torque according to the magnitude of the load and the direction of hoisting, for providing a compensation signal corresponding to said static frictional torque; a first summing means for adding said load detection signal to said compensation signal and providing a load-boosted compensation signal; and a second summing means for adding said load-boosted signal to said torque command signal and providing a load-boosted compensated torque signal for driving said elevator motor.
Claim 2
Dependent Claim
229 words
A start compensation device for an elevator motor controller performing start compensation by detecting a load of a passenger cage and adding a compensation signal corresponding to the detected load to a torque command signal, the elevator start compensation device comprising: a load sensor, for providing a load detection signal indicative of the load upon the elevator car; a speed sensor for providing a speed signal proportional to a rotating speed of the elevator motor; a speed command circuit, responsive to direction indicating command signals, for providing a speed command signal for commanding lifting and lowering of the elevator car at a selected speed; an automatic speed control amplifier, responsive to a signal having a magnitude indicative of a difference between said speed command signal and said speed signal, for providing a torque command signal; a static frictional torque compensator, responsive to said load detection signal and to said direction indicating command signals, for determining a static frictional torque according to the magnitude of the load and the direction of hoisting, for providing a compensation signal corresponding to said static frictional torque; a first summing means for adding said load detection signal to said compensation signal and providing a load-boosted compensation signal; and a second summing means for adding said load-boosted signal to said torque command signal and providing a load-boosted compensated torque signal for driving said elevator motor.
References Cited (Backward Citations)
US4828075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |