Patent
Elevator speed control system
Tsuyoshi Satoh,Kenzo Tachino +1 more
- 07 Feb 1977
31
TL;DR: In this paper, a command acceleration pattern in the form of frequency modulated clock pulses is counted by a first and a second counter, at equal increments of speed, to calculate the distances of movement of the care which is successively stored in a random access memory at addresses determined by the speeds from the second counter.
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Abstract: During the acceleration of an elevator car a command acceleration pattern in the form of frequency modulated clock pulses is counted by a first and a second counter. The first counter issues a command speed pattern. The speed pattern is integrated to calculate the distances of movement of the care which is successively stored in a random access memory at addresses determined by the speeds from the second counter, at equal increments of speed. During the deceleration the distances of movement succesively read out from the memory are compared with the residual distances to the stop floor and the second counter counts the results of the comparison down to produce an ideal speed curve. The curve supplied to the memory is also compared with the actual car speed to modify the command acceleration with the result that the actual speed follows up the ideal speed curve.
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Citations
Patent
Controller for elevator
Hiromi Inaba,Seiya Shima,Takeki Ando,Toshiaki Kurosawa,Yasunori Katayama,Takanobu Hatakeyama,Sadao Hokari +6 more
- 02 Sep 1982
TL;DR: In this paper, an elevator controller uses an acceleration command signal that has as its initial value a start shock compensation torque which will offset the unbalance torque caused at the time of starting.
132
Patent
Drive control for an elevator
Schroeder Joris,Meier Martin +1 more
- 19 Sep 1980
TL;DR: In this paper, a stop initiation device, which during initiating the stop or halting of the elevator, forms from a possible target path produced by the reference value transmitter and a target path corresponding to a target storey a target error.
33
Patent
Elevator speed dictation system
Clement A. Skalski
- 02 Jul 1990
TL;DR: In this paper, an elevator speed dictation system for controlling the acceleration and deceleration of an elevator is described. Butterworth et al. present a table for storing values of acceleration, velocity and position based on the dictated velocity values, with position being the index into the table.
30
System and method for damping vibrations in elevator cables
Weidong Zhu,Yan Chen +1 more
TL;DR: In this paper, a vibration damped elevator system is described that includes a damper or dampers attached to the elevator cable and a method of determining the optimum placement of the damper and their respective damping coefficients is provided.
28
Patent
Digital selector system for elevators
Gordon A. Holland
- 05 Aug 1985
TL;DR: In this paper, a digital selector system with position indicators in the hatch to provide signals indicative of nearest floor and signals when the car is level with a floor is used to determine critical car distances for making stopping decisions.
28
References
Patent
Digital pattern generator for motor speed control
Andre Wavre
- 07 May 1969
TL;DR: In this article, a speed reference signal for an elevator speed control is generated by a nonlinear digital to analog converter as a function of the accumulated count in a first reversible digital counter of pulses representative of increments of displacement between the car and the hatchway.
23
Patent
Predictive drive control
E Gilbert
- 09 May 1972
TL;DR: In this paper, a drive control illustrated for controlling an elevator hoist motor and car position involving a control pattern causing the car to follow idealized constraints of constant jerk in transitions between constant velocity and constant acceleration is presented.
22
Patent
Electronic motion control system for elevators
William Robert Hoelscher,Alvin James Vildibill +1 more
- 04 Aug 1971
TL;DR: An elevator control system that utilizes a digital signal representative of the car position to provide the necessary information inputs to the selective logic system and motor control so that a smooth acceleration to maximum velocity and deceleration to stop at a selected floor is achieved as discussed by the authors.
17
Patent
Method and circuit arrangement for controlling the braking of a drive
Alfons Rickert
- 02 Jan 1974
TL;DR: In this article, a method and circuit for controlling the braking operation of a drive to slow the movement of an object along a predetermined path and to stop the moving object precisely at a target position is presented.
17
Patent
Final stopping control
TL;DR: In this article, an elevator pattern generator for controlling the terminal portion of the travel of an object along a fixed path is described, which diminishes as the object approaches its destination whereby a smooth stop is dictated.
15