GB873724A - Control systems for electric motors - Google Patents

Control systems for electric motors

Info

Publication number
GB873724A
GB873724A GB20337/59A GB2033759A GB873724A GB 873724 A GB873724 A GB 873724A GB 20337/59 A GB20337/59 A GB 20337/59A GB 2033759 A GB2033759 A GB 2033759A GB 873724 A GB873724 A GB 873724A
Authority
GB
United Kingdom
Prior art keywords
hoist
speed
motor
motors
june
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB20337/59A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric USA Inc
Original Assignee
Square D Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Square D Co filed Critical Square D Co
Publication of GB873724A publication Critical patent/GB873724A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
    • B66B5/06—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed electrical

Landscapes

  • Control Of Multiple Motors (AREA)

Abstract

873,724. Control of several motors. SQUARE D CO. June 15, 1959 [June 18, 1958], No. 20337/59. Drawings to Specification. Class 38 (3). Excessive speed of a hoist motor coupled to an overhauling load is prevented by means of a differential gear one input shaft of which is driven by the hoist motor whilst the other input shaft is driven by a parallel-connected constantspeed motor. The third element of the differential operates a two-way switch which opens the circuit of both motors when the third element changes its direction of rotation due to the hoist motor exceeding a predetermined speed. A push-button control system for two induction motors having a common shaft and driving a double-skip hoist is referred to. The two-way switch is effective for both directions of operation of the hoist and controls the main contactors in series with the hoist motors and the constant-speed motor. A number of the control relays are supplied at reduced voltage through a transformer, Fig. 2 (not shown). In a modification, the variable-speed motor is disconnected from its power source upon reaching a minimum speed at the lower end of a speed range.
GB20337/59A 1958-06-18 1959-06-15 Control systems for electric motors Expired GB873724A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US873724XA 1958-06-18 1958-06-18

Publications (1)

Publication Number Publication Date
GB873724A true GB873724A (en) 1961-07-26

Family

ID=22204790

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20337/59A Expired GB873724A (en) 1958-06-18 1959-06-15 Control systems for electric motors

Country Status (1)

Country Link
GB (1) GB873724A (en)

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