公开(公告)号：US3706017A

公开(公告)日：1972-12-12

申请号：US3706017D

申请日：1970-07-15

Applicant: DOVER CORP CANADA LTD

Inventor： GINGRICH JOHN A

IPC: B66B1/30 ,  H02P7/34

CPC classification number: B66B1/30 ,  H02P7/347

Abstract: A SYSTEM FOR ACCURATELY CONTROLLING THE SPEED OF A D.C. MOTOR WHICH IS POWERED BY THE GENERATOR OF A MOTORGENERATOR SET. THE FLUX IN THE GENERATOR IS CONTROLLED BY A GENERATOR FIELD SUPPLIED BY A SWITCHING BRIDGE AMPLIFIER. THE VOLTAGE INDUCED IN AN EXTRA GENERATOR FIELD IS INTEGRATED TO OBTAIN A MEASUREMENT OF THE CHANGE OF THE FLUX IN THE GENERATOR AND THIS MEASUREMENT IS USED TO CONTROL THE SWITCHING OF THE BRIDGE AMPLIFIER. THE CONTROL IS EFFECTED IN SUCH A WAY THAT THE RATE OF CHANGE OF FLUX IN THE GENERATOR IS MADE PROPORTIONAL TO THE ERROR BETWEEN THE PATTERN SPEED AND THE MEASURED SPEED OF THE D.C. MOTOR.

D R A W I N G

公开(公告)号：US3561571A

公开(公告)日：1971-02-09

申请号：US3561571D

申请日：1966-11-04

Applicant: DOVER CORP

Inventor： GINGRICH JOHN A

IPC: B66B1/16 ,  B66B1/20 ,  B66B1/24 ,  B66B1/34

CPC classification number: B66B1/3484 ,  B66B1/2458 ,  B66B2201/102 ,  B66B2201/211 ,  B66B2201/222 ,  B66B2201/226 ,  B66B2201/231 ,  B66B2201/241 ,  B66B2201/243 ,  B66B2201/303 ,  B66B2201/403

Abstract: The disclosure relates to an elevator group supervisory control system in which bits of information, as to registered demands for service, position of the cars, and the degree of availability of the cars relative to the number of calls for service each is capable of answering without undue delay, are successively and repetitively scanned to control the respective movement of the cars.

公开(公告)号：US3371747A

公开(公告)日：1968-03-05

申请号：US37460864

申请日：1964-06-12

Applicant: DOVER CORP

Inventor： GINGRICH JOHN A ,  HOLLAND GORDON A

IPC: B66B1/20

CPC classification number: B66B1/20