GB709835A - Improvements relating to ward-leonard systems for winding engines - Google Patents

Improvements relating to ward-leonard systems for winding engines

Info

Publication number
GB709835A
GB709835A GB27933/51A GB2793351A GB709835A GB 709835 A GB709835 A GB 709835A GB 27933/51 A GB27933/51 A GB 27933/51A GB 2793351 A GB2793351 A GB 2793351A GB 709835 A GB709835 A GB 709835A
Authority
GB
United Kingdom
Prior art keywords
generator
winding
current
voltage
power
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
GB27933/51A
Inventor
Geoffrey Edmund Woodliff
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB27933/51A priority Critical patent/GB709835A/en
Publication of GB709835A publication Critical patent/GB709835A/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

709,835. Control of D.C. motors. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 25, 1952 [Nov. 28, 1951], No. 27933/51. Class 38(3) Relates to means for restricting the power input to, or the power output from, a Ward Leonard set comprising an A.C. motor 1M driving a generator G which supplies a winder motor M. The generator has a field winding GF energized from an excitation system GE having a winding GEF2 responding to the difference between voltages derived respectively from a reference potentiometer P1 and from a potentiometer P2 which is connected across the generator G. The excitation system GE also has a field winding GEF1 which opposes the winding GEF2, and, when energized, reduces the excitation of the field winding GF. When the power input to the motor IM exceeds a pre-determined value, a current transformer CT passes current through resistor R3 and rectifier S1 to the winding GEF1, this current being opposed by a fixed bias voltage obtained from resistor R2 and rectifier S2. Excess demand of power from the A.C. supply thus causes reduction of the generator excitation and of the acceleration of the winder motor. If the motor 1M is of the induction type its rotor current is indicative of the power the machine is supplying, so that a current transformer connected in the rotor circuit may be used to excite the winding GEF1 in a similar manner to that described, Fig. 2 (not shown). A synchronous motor driving the Ward Leonard generator may have field boosting apparatus for increasing the motor excitation as a function of the power taken from the line, such as is described in Specification 629,586, [Group XXXV]. The output voltage from this device may be used to measure the power demand and may be applied to the winding GEF1, Fig. 3 (not shown). In other embodiments the power-restricting winding GEF1 is excited in accordance with the product of the current and voltage output of the Ward Leonard generator. An auxiliary generator mechanically coupled to the winder motor and excited in response to the Ward Leonard generator current provides such an indication of the power obtained from the Ward Leonard set, Figs. 4, 5 (not shown). Means may be provided for restricting the excitation of the Ward Leonard generator when a voltage responsive to the generator current exceeds a reference voltage which may be reduced in a stepped manner by the actuation of relays responsive to increasing values of the current suppled to the motor driving the generator. Alternatively, the relays may be responsive to the generator voltage. In this manner, the maximum current output of the generator is reduced as the voltage applied to the winder motor increases, so that the A.C. power supplied to the Ward Leonard set is also restricted, Figs. 6, 8 (not shown). In another arrangement, the generator excitation is restricted when a voltage representing the sum of components respectively responsive to the voltage and current of the Ward Leonard generator exceeds a reference voltage, Fig. 7 (not shown).
GB27933/51A 1951-11-28 1951-11-28 Improvements relating to ward-leonard systems for winding engines Expired GB709835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB27933/51A GB709835A (en) 1951-11-28 1951-11-28 Improvements relating to ward-leonard systems for winding engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27933/51A GB709835A (en) 1951-11-28 1951-11-28 Improvements relating to ward-leonard systems for winding engines

Publications (1)

Publication Number Publication Date
GB709835A true GB709835A (en) 1954-06-02

Family

ID=10267620

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27933/51A Expired GB709835A (en) 1951-11-28 1951-11-28 Improvements relating to ward-leonard systems for winding engines

Country Status (1)

Country Link
GB (1) GB709835A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848673A (en) * 1954-07-28 1958-08-19 Square D Co Magnetic amplifier motor control
US3045161A (en) * 1957-05-28 1962-07-17 Allis Louis Co Motor speed regulator arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848673A (en) * 1954-07-28 1958-08-19 Square D Co Magnetic amplifier motor control
US3045161A (en) * 1957-05-28 1962-07-17 Allis Louis Co Motor speed regulator arrangement

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