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Publication numberUS3747710 A
Publication typeGrant
Publication dateJul 24, 1973
Filing dateMay 17, 1972
Priority dateMay 17, 1972
Also published asCA985808A1, DE2325096A1
Publication numberUS 3747710 A, US 3747710A, US-A-3747710, US3747710 A, US3747710A
InventorsC Winkler
Original AssigneeWestinghouse Electric Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Distance slowdown control for elevator systems
US 3747710 A
Abstract
Distance slowdown control for an elevator system which provides a predetermined portion of a speed pattern used by the motor control of the elevator system. The portion of the speed pattern provided by the distance slowdown control is responsive to the distance to go to the floor at which the elevator car is going to stop. At a predetermined distance from the floor, termed the transfer point, the speed pattern is transferred from the distance slowdown control to another control. The distance slowdown control is automatically calibrated during each run of the elevator car for the specific distance to go from the transfer point to the floor. When the elevator car reaches the transfer point, the calibrated voltage from the distance slowdown control will be at the correct magnitude for transfer to the other control.
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Description  (OCR text may contain errors)

United States Patent Winkler 9 [45! July 24, 1973 DISTANCE SLOWDOWN CONTROL FOR ELEVATOR SYSTEMS Primary Examiner-Bernard A. Gilheany Assistant Examiner-W. E Duncanson, Jr. Altorney-A. T. Stratton and Donald R. Lackey [5 7] ABSTRACT Distance slowdown control for an elevator system which provides a predetermined portion of a speed pattern used by the motor control of the elevator system. The portion of the speed pattern provided by the distance slowdown control is responsive to the distance to go to the floor at which the elevator car is going to stop. At a predetermined distance from the floor, termed the transfer point, the speed pattern is transferred from the distance slowdown control to another control. The distance slowdown control is automatically calibrated during each run of the elevator car for the specific distance to go from the transfer point to the floor. When the elevator car reaches the transfer point, the calibrated voltage from the distance slowdown control will be at the correct magnitude for transfer to the other control.

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PATENTEU SHEET [)8 BF LOGIC 96 FIG. 9

PATENTEB JUL 2 4 I915 SHEET USUF 19 FIG. IO

JULZMQH 7 7 1 O SHEET 10 [1F 19 FLOOR CORRIDOR CALLS CAR CAN CONSIDER WHEN TRAVELLING m A GIVEN DIRECTION FIG. I I

PATENIEU 7 1 0 SHEET 11 HF 19 SPEED PATTERN GENERATOR 48 1 suMMING 540 99 cIRcuIT A TO cAR OIR CTION l+ SRAT ACCX LOGIC RELAY 562 UPTR v SPBT ACC START SPSZ 54 l Mx 542 TIME RAMP \ANA 0G GENERATOR TRAN SWITCH NLC mm {544 ACC 546 W! REVERSIBLE DISTANCE OsAN ANALOG OLE cOuNTER a SLOWDOWN SWITCH UP ANALOG 065w 556 SWITCH I HTI R R I rHTAN ANALOG SWITCH 554 I INALOG WITCH OOwN V T I J 56/0 558 MINA\ TSAN TERMINAL ANALOG PLSDI; SLOWDOWN SWITCH NUS) 5 ORIvER SPSw PULSE I OETEGTOR MOTOR TOVSP DLZ OcL TOP TACH BOTTOM LHO sTARTIAGOXI 564 UPTR uPTR ACCX NANO 56U NAND A OGO 512 WP 3570 $575 NAND OACC 574 I A N 576 SPSL D Q I A C r580 578 AND OSPSZ Q I FIG. l3 LOGIC 540 PATENIEDmzama SHEET 13 [1F W 0% O 8 8 I M Q kw L w Um M 5m 1 EA M m5 DD m a l I I I I I I I l l I l I I l I I II E 9 -I Wl I l l I I I l I l l I I l II E m TI qiIlwl III E 6 l 7 I I I I I l I l I l I l l I I l I- L 8 DE rm 6 3M 4 A I 7 B 8 H H n W 6 Am ODN Err.) SPK R D Cm 00R a2 E MP OIIM h FIG. ISA

PAIENTED L 2 4 73 SHEET 15 [1F TIME RAMP GENERATOR R a N U w D O S) 0 mm W) RT ON TM 9%. H D m 4 m 6 ANN 8 T. 5 D l TIME RAMPGENERATOR (TRAN) LEO- 0 TIME 0- JERK ACCELERATION SPEED (TRAN) SPEED (SRAT) I FIG. l6

PATENTED JUL 240975 SHEET 17 [1F mwEFBm M855 PATEN'I'EU JIII 2 4 7 VOLTAGE INPUT TO FILTER AMPLIFIER AMPLIFIER VOLTAGE I+I INPUT TO FILTER AMPLIFIER VOLTAGE OUTPUT OF 2 FILTER VI AMPLIFIER SHEET lSUF 19 FIG. 20A

TIME

TIME

SPSW

TOVSP FIG. 20B

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3570630 *Feb 3, 1969Mar 16, 1971Otis Elevator CoLanding selector apparatus
US3589474 *May 7, 1969Jun 29, 1971Westinghouse Electric CorpDigital pattern generator for motor speed control
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4155426 *May 5, 1978May 22, 1979Westinghouse Electric Corp.Digital speed pattern generator
US4193478 *Apr 26, 1977Mar 18, 1980Elevator IndustriesElevator control system and method
US4220221 *Feb 2, 1977Sep 2, 1980Dover CorporationMethod and apparatus for producing a speed pattern for an elevator car or similar vehicle
US4261439 *Sep 10, 1979Apr 14, 1981Westinghouse Electric Corp.Elevator system
US4331220 *Nov 4, 1980May 25, 1982Westinghouse Electric Corp.Elevator system
US4463833 *Aug 19, 1982Aug 7, 1984Westinghouse Electric Corp.Elevator system
US4515246 *Feb 15, 1983May 7, 1985Mitsubishi Denki Kabushiki KaishaApparatus for controlling the arrival of an elevator cage at an elevator floor
US4527662 *Apr 1, 1983Jul 9, 1985Otis Elevator CompanyElevator speed control
US5509505 *Jan 13, 1995Apr 23, 1996Otis Elevator CompanyArrangement for detecting elevator car position
US7228943 *Sep 26, 2002Jun 12, 2007Mitsubishi Denki Kabushiki KaishaElevator apparatus with position correction for overspeed detection
US7377363 *Feb 24, 2003May 27, 2008Otis Elevator CompanyElevator with variable drag for car and counterweight
Classifications
U.S. Classification187/295
International ClassificationB66B1/16, B66B1/24
Cooperative ClassificationB66B1/285
European ClassificationB66B20/00