GB647692A - Improvements in or relating to electric motors - Google Patents

Improvements in or relating to electric motors

Info

Publication number
GB647692A
GB647692A GB2513548A GB2513548A GB647692A GB 647692 A GB647692 A GB 647692A GB 2513548 A GB2513548 A GB 2513548A GB 2513548 A GB2513548 A GB 2513548A GB 647692 A GB647692 A GB 647692A
Authority
GB
United Kingdom
Prior art keywords
field
field windings
contacts
relating
electric motors
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
GB2513548A
Inventor
Frederick Percival Mason
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.)
Creed and Co Ltd
Original Assignee
Creed and 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 Creed and Co Ltd filed Critical Creed and Co Ltd
Priority to GB2513548A priority Critical patent/GB647692A/en
Publication of GB647692A publication Critical patent/GB647692A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements 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
    • H02P7/063—Arrangements 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 using centrifugal devices, e.g. switch, resistor

Abstract

647,692. Automatic speed control systems. CREED & CO., Ltd. Sept. 27, 1948, No. 25135. [Class 38 (iv)] In a series-wound commutator type electric motor adapted to be speed-controlled by centrifugally-operated contacts 3 in the power supply to the motor, an arc-prevention device is provided which comprises a potential dividing network 4, 5 connected across the field windings 1 and armature 2. Upon an opening of the contacts 3 the field shunting circuit 4 prevents the induction of large potentials in the field windings 1 by limiting the rate at which the field magnetic flux falls. Also the flux is prevented from falling to zero owing to the path via field windings 1, conductor 8, and resistance 5.
GB2513548A 1948-09-27 1948-09-27 Improvements in or relating to electric motors Expired GB647692A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2513548A GB647692A (en) 1948-09-27 1948-09-27 Improvements in or relating to electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2513548A GB647692A (en) 1948-09-27 1948-09-27 Improvements in or relating to electric motors

Publications (1)

Publication Number Publication Date
GB647692A true GB647692A (en) 1950-12-20

Family

ID=10222770

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2513548A Expired GB647692A (en) 1948-09-27 1948-09-27 Improvements in or relating to electric motors

Country Status (1)

Country Link
GB (1) GB647692A (en)

Similar Documents

Publication Publication Date Title
GB1186427A (en) Speed-Regulated Direct-Current Motor
GB647692A (en) Improvements in or relating to electric motors
GB1045772A (en) Improvements in or relating to direct-current motors
GB1076223A (en) Brushless electric motors and speed control thereof
GB940848A (en) Improvements in and relating to electrical control circuits
GB1117329A (en) Brushless direct-current motor
US3214597A (en) Model train control
GB977762A (en) Apparatus controlling the speed of direct current motors
GB963867A (en) Electric motor
GB1289359A (en)
GB1273720A (en) Electrical tool
GB1273782A (en) Improvements in or relating to protective circuits
GB748690A (en) Improvements in or relating to electric motor controlling equipment
GB674930A (en) Improvements in or relating to electromagnetic torque-producing devices
JPS5343316A (en) Operation control system for electric car
GB522203A (en) Improvements in and relating to electric motor control systems
GB613602A (en) Improvements in or relating to direct current electric motors
GB718631A (en) Improvements in or relating to speed control of a.c. electric motors
GB856224A (en) Improvements in speed regulating devices for electric motors and the like
GB992175A (en) Improvements in and relating to the control of a.c. motors
GB669347A (en) Improvements in and relating to electromagnetic devices
GB969869A (en) Variable speed electric motors
GB1085493A (en) Speed control for alternating-current operated permanent-magnet motor
GB1222893A (en) Electric motor control circuit
GB785894A (en) Improvements in or relating to electrical circuits of the kind including an electro-magnetic device