GB818071A - Improvements in or relating to feed-back speed regulating systems for electric motors - Google Patents

Improvements in or relating to feed-back speed regulating systems for electric motors

Info

Publication number
GB818071A
GB818071A GB36917/55A GB3691755A GB818071A GB 818071 A GB818071 A GB 818071A GB 36917/55 A GB36917/55 A GB 36917/55A GB 3691755 A GB3691755 A GB 3691755A GB 818071 A GB818071 A GB 818071A
Authority
GB
United Kingdom
Prior art keywords
current
rectifier
voltage
control
motor
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
GB36917/55A
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
Priority to US818071XA priority Critical
Application filed by Igranic Electric Co Ltd filed Critical Igranic Electric Co Ltd
Publication of GB818071A publication Critical patent/GB818071A/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
    • H02P7/347Arrangements 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 in which only the generator field is controlled

Abstract

818,071. Automatic speed control. IGRANIC ELECTRIC CO. Ltd. Dec. 23, 1955 [Jan. 19, 1955], No. 36917/55. Class 38 (4). [Also in Group XXXVII] In a Ward-Leonard system the motor speed is regulated by a voltage which is the difference between a reference voltage representing a base speed and a second voltage representing the difference between the actual and desired speeds, the regulating voltage being used to control the generator or motor field current depending on its polarity and amplitude. In the embodiment described, the generator 16 has an armature 14 connected in series with the armature 12 of the motor 10. The field windings 20, 18 respectively are supplied from full-wave rectifiers 38, 32 respectively fed from the A.C. line L1, L2 through the power windings 24b, 24c and 22b, 22c of magnetic amplifiers 24, 22 and oppositelypoled pairs of rectifiers 34, 36 and 28, 30 respectively. The amplifiers 24, 22 have biasing windings 24a, 22a, respectively, fed from a full-wave rectifier 47 and control windings 24d, 22d, respectively. The D.C. control current in lines 52, 54, depending upon its polarity, flows through rectifier 48 and winding 22d to decrease the motor field current and increase motor speed or through rectifier 50 and winding 24d to decrease the generator field current and hence decrease the motor speed. The voltage responsible for the control current is the difference between a fixed reference voltage produced across resistance 56 by a current derived from a rectifier 60 fed by transformer 62 and the voltage produced across resistance 46 by the current from a rectifier 44 supplied from the output windings 26b, 26c of a third magnetic amplifier 26. The control winding 26d of the latter carries current depending upon the difference between a speed reference voltage, derived from rectifier 47 through a setting potentiometer 66, and a voltage representing the actual motor speed, from a tacho-generator 64. The biasing winding 26a of amplifier 26 is also supplied from rectifier 47. A negative feedback loop supplies a control winding 26e with a current representing the rate of change of armature current from a transformer 70 and another loop feeds a control winding 26f with a current representing the rate of change of motor speed and derived from the resistance 46 through a capacitance 72. In a modification, the motor speeds at which rectifiers 48, 50 start conducting are different, the windings 22d, 24d being returned to different tappings on the load resistors of rectifier 60, Fig. 4 (not shown).
GB36917/55A 1955-01-19 1955-12-23 Improvements in or relating to feed-back speed regulating systems for electric motors Expired GB818071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US818071XA true 1955-01-19 1955-01-19

Publications (1)

Publication Number Publication Date
GB818071A true GB818071A (en) 1959-08-12

Family

ID=22166522

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36917/55A Expired GB818071A (en) 1955-01-19 1955-12-23 Improvements in or relating to feed-back speed regulating systems for electric motors

Country Status (1)

Country Link
GB (1) GB818071A (en)

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