GB857911A - Improvements in or relating to electric motor and brake control systems - Google Patents

Improvements in or relating to electric motor and brake control systems

Info

Publication number
GB857911A
GB857911A GB29807/57A GB2980757A GB857911A GB 857911 A GB857911 A GB 857911A GB 29807/57 A GB29807/57 A GB 29807/57A GB 2980757 A GB2980757 A GB 2980757A GB 857911 A GB857911 A GB 857911A
Authority
GB
United Kingdom
Prior art keywords
motor
windings
brake
speed
amplifier
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
GB29807/57A
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.)
Cutler Hammer Europe Ltd
Original Assignee
Igranic Electric Co Ltd
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 Igranic Electric Co Ltd filed Critical Igranic Electric Co Ltd
Publication of GB857911A publication Critical patent/GB857911A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/22—Control systems or devices for electric drives
    • B66C13/23—Circuits for controlling the lowering of the load
    • B66C13/26—Circuits for controlling the lowering of the load by ac motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/081—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists with ac motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Stopping Of Electric Motors (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

857,911. Control of two A.C. motors. IGRANIC ELECTRIC CO. Ltd. Sept. 23, 1957 [Sept. 21, 1956], No. 29807/57. Class 38 (3). A barge is hauled in different directions by means of induction motors 1, 2, each of which has an electro-dynamic brake 16, 17, comprising windings 16a, 17a and a drum controller DC is provided for initiating operation of a selected one of the motors, the brake winding of the other motor being energized at the same time in accordance with the speed of the selected motor. When motor 2 is energized for hauling the barge downstream, a magnetic amplifier MA2 is disconnected to prevent braking of the motor 2, but the brake winding 16a for the motor 1 is energized from a magnetic amplifier MA1 which has output windings 25a, 25b, bias windings 26a, 26b and signal windings 27a, 27b. These latter control windings are supplied in accordance with the voltage drop across resistor R6-4 in the secondary circuit of the motor 2. The motor 2 starts with all the resistors effectively included in the secondary network and as the secondary current decreases with increase of speed, the output of amplifier MA1 increases to provide a greater braking torque. As the controller DC is moved to operating positions corresponding to higher speed-points for the motor 2, the magnetic amplifier MA1 is rendered ineffective to energize the brake winding 16a until the speed of the motor reaches a predetermined value, and effective to increase the brake-energization with increasing speed above that value. Adjustment of the controller DC in the " upstream " direction energizes the primary winding of the motor 1, interrupts the connections to the magnetic amplifier MA1, and causes the signal windings of the amplifier MA2 to be supplied with rectified current proportional to the secondary current of the motor 1. If a minimum braking torque is required under any operating condition, closure of switch 45 or 67 connects brake winding 16a or 17a across rectifier bridge 38. Specification 827,871 is referred to.
GB29807/57A 1956-09-21 1957-09-23 Improvements in or relating to electric motor and brake control systems Expired GB857911A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US857911XA 1956-09-21 1956-09-21

Publications (1)

Publication Number Publication Date
GB857911A true GB857911A (en) 1961-01-04

Family

ID=22193965

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29807/57A Expired GB857911A (en) 1956-09-21 1957-09-23 Improvements in or relating to electric motor and brake control systems

Country Status (1)

Country Link
GB (1) GB857911A (en)

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