GB999314A - Method of and apparatus for hoisting and lowering loads - Google Patents

Method of and apparatus for hoisting and lowering loads

Info

Publication number
GB999314A
GB999314A GB2471162A GB2471162A GB999314A GB 999314 A GB999314 A GB 999314A GB 2471162 A GB2471162 A GB 2471162A GB 2471162 A GB2471162 A GB 2471162A GB 999314 A GB999314 A GB 999314A
Authority
GB
United Kingdom
Prior art keywords
motor
hoisting
load
auxiliary
rotor
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
GB2471162A
Inventor
Frederick Yorke Grepe
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.)
Canadian Controllers Ltd
Original Assignee
Canadian Controllers 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 Canadian Controllers Ltd filed Critical Canadian Controllers Ltd
Priority to GB2471162A priority Critical patent/GB999314A/en
Publication of GB999314A publication Critical patent/GB999314A/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)
  • Control And Safety Of Cranes (AREA)

Abstract

999,314. Control of two A.C. motors. CANADIAN CONTROLLERS Ltd. June 27, 1962, No. 24711/62. Heading H2J. Relates to a control system for a hoist in which two A.C. motors are coupled to a load, and each motor has variable resistance in its rotor circuit. In the first hoisting-position of a drum controller, main motor 1 is connected to supply main 3, 4, 5, and a friction brake B is released after the motor is energized. The stator of auxiliary motor 6 is supplied with direct-current to exert a braking torque against the driving action of the main motor. The main motor has high secondary resistance, while that of the auxiliary is low in value. In the second hoisting-position the driving torque is increased and the braking torque reduced by rotor control. The auxiliary motor is connected to assist in hoisting the load in the third hoisting-position of the drum controller. Thereafter the load is lifted at high speeds, the rotor resistances being reduced in steps under the control of timing contactors. If an overhoist limit switch is operated, when the controller is in the first or second hoisting-position, the braking torque exerted by the auxiliary motor will assist the friction brake in stopping the load. The limit switch contacts may be connected either in a contactor circuit or directly in the motor circuit. In the first lowering-position of the controller, the secondary circuit of the main motor is connected to energize the stator with direct-current in addition to the current derived from rectifier 95. The auxiliary motor is idle at this time. Thereafter, the rotor resistance of the main motor is increased and the auxiliary motor is connected to drive the load downward. Further acceleration is provided by reducing the rotor resistance of the auxiliary motor, and then connecting the main motor to assist the downward drive. The stator of the auxiliary motor may be supplied with direct-current for braking in the "off" position of the drum controller.
GB2471162A 1962-06-27 1962-06-27 Method of and apparatus for hoisting and lowering loads Expired GB999314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2471162A GB999314A (en) 1962-06-27 1962-06-27 Method of and apparatus for hoisting and lowering loads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2471162A GB999314A (en) 1962-06-27 1962-06-27 Method of and apparatus for hoisting and lowering loads

Publications (1)

Publication Number Publication Date
GB999314A true GB999314A (en) 1965-07-21

Family

ID=10216032

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2471162A Expired GB999314A (en) 1962-06-27 1962-06-27 Method of and apparatus for hoisting and lowering loads

Country Status (1)

Country Link
GB (1) GB999314A (en)

Similar Documents

Publication Publication Date Title
GB1409601A (en) Adjustable voltage thyristor-controlled hoist control for a dc motor
GB1315589A (en) Control apparatus for an elevator car
GB999314A (en) Method of and apparatus for hoisting and lowering loads
US3029372A (en) Stepless hoist control
US2982897A (en) Dual-motor a.c. drive for automatic hoists
GB1000582A (en) A c. hoist control system
US2118219A (en) Induction motor driving and braking system
GB1102858A (en) Safety device for elevator
US1753351A (en) Motor-control system for elevators and the like
US2214020A (en) Motor controller
US1708887A (en) System of motor control
RU1791951C (en) Reversible electric drive
US1882958A (en) Motor rheostat for acceleration
US2288133A (en) Dynamic lowering crane controller
US3166697A (en) Dual motor control system for cranes
US1756572A (en) Motor-control system
GB1198199A (en) Braking Equipment for Hoisting Gear Electric Motors
GB912874A (en) Improvements in or relating to apparatus including polechanging asynchronous electric motors
GB1319684A (en) Hoists
GB186557A (en) Improvements in and relating to electric motor control systems
GB826987A (en) Improvements in speed control mechanism for a.c. motor
JPS5950591B2 (en) AC elevator re-flooring control device
FR2314129A1 (en) Lift cage drive mechanism - selects motor windings and brake operation to suit cage load and travel direction
GB567508A (en) Improvements in or relating to electric motor controllers
GB546942A (en) Improvements in and relating to electric motor control systems