GB720000A - Improvements in and relating to electric motor control systems - Google Patents

Improvements in and relating to electric motor control systems

Info

Publication number
GB720000A
GB720000A GB3244452A GB3244452A GB720000A GB 720000 A GB720000 A GB 720000A GB 3244452 A GB3244452 A GB 3244452A GB 3244452 A GB3244452 A GB 3244452A GB 720000 A GB720000 A GB 720000A
Authority
GB
United Kingdom
Prior art keywords
winding
motor
series
generator
shunt
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
GB3244452A
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.)
General Electric Co
Original Assignee
General Electric 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
Priority to US720000XA priority Critical
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB720000A publication Critical patent/GB720000A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/34Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using Ward-Leonard arrangements

Abstract

720,000. Control of D.C. motors. GENERAL ELECTRIC CO. Dec. 22, 1952 [Dec. 28, 1951], No. 32444/52. Class 38(3) [Also in Group XXXV] A hoist is driven by a compound wound D.C. motor 2 having a series field winding 2b and a shunt field winding 2c. A generator 5 for supplying the motor with variable voltage is driven at constant speed by an induction motor 6 which also drives a machine 11 for exciting the generator field winding 5b. The shunt field winding 2c of the motor is supplied from the exciter and is poled so that its magnetization is added to that of the series field winding 2b during motoring operation in the hoisting direction. A rectifier 17 is connected in parallel with the winding 2b to prevent demagnetization of the hoist motor during regenerative braking in the hoisting direction or during motoring operation in the lowering direction, the rectifier acting as a by-pass for the series field winding so that its magnetization affords no substantial opposition to that due to the shunt field winding 2c. There will be a slight voltagedrop across the rectifier 17 when it passes current. A resistor 18 is therefore connected in series with the winding 2b to reduce the field current to a negligible value. The direction of rotation of the motor and the strength of the generator field winding 5b is controlled by a master switch 12 which regulates resistor 19 in series with exciter 11. In the " off " position of the controller the field winding 5b is connected across the armature of the generator.
GB3244452A 1951-12-28 1952-12-22 Improvements in and relating to electric motor control systems Expired GB720000A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US720000XA true 1951-12-28 1951-12-28

Publications (1)

Publication Number Publication Date
GB720000A true GB720000A (en) 1954-12-08

Family

ID=22104926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3244452A Expired GB720000A (en) 1951-12-28 1952-12-22 Improvements in and relating to electric motor control systems

Country Status (1)

Country Link
GB (1) GB720000A (en)

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