GB471361A - Improvements in and relating to systems of electric motor control - Google Patents
Improvements in and relating to systems of electric motor controlInfo
- Publication number
- GB471361A GB471361A GB6301/36A GB630136A GB471361A GB 471361 A GB471361 A GB 471361A GB 6301/36 A GB6301/36 A GB 6301/36A GB 630136 A GB630136 A GB 630136A GB 471361 A GB471361 A GB 471361A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- generator
- condenser
- motor
- field
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/06—Gearings comprising primarily only links or levers, with or without slides which can be made ineffective when desired
-
- 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
- H02P7/18—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 by master control with auxiliary power
- H02P7/34—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 by master control with auxiliary power using Ward-Leonard arrangements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
471,361. Automatic control systems; rectifying alternating currents. BRITISH THOMSON-HOUSTON CO., Ltd. March 2, 1936, No. 6301.. Convention date, March 1, 1935. [Classes 38 (ii) and 38 (iv)] [Also in Group XXXVII] Speed.-When a control arm 43 is moved from its central position, one of two reversing switches 45, 46, is closed to connect the field winding 14 of the generator of a Ward-Leonard system to a source 20, through a grid-controlled discharge device 21, a control arm 38 remaining in contact with a segment 56, and the grid of the device 21 being subjected to a bias voltage lagging the anode voltage by 90‹ and obtained from a transformer 25. No appreciable current flows through the device 21 and the motor 10 is not started. The control arm 38 is then moved over potentiometer resistance 35 to an extent corresponding to the desired speed of the motor, and a condenser 29 in the grid circuit of the device 21 is subjected to a corresponding voltage through a resistance 41 and a rectifier 42. The device 21 is thus rendered conducting and the generator field and motor speed build up. The grid circuit includes a voltage which is derived from a generator 19 driven by the motor 10 and opposes the condenser voltage. The motor accelerates in accordance with the rate at which the condenser charges until the voltage of the generator 19 matches the condenser voltage. The system then operates to maintain the speed uniform. When the control arm 38 is moved towards its central position the condenser 29 discharges through a resistance 40, and the motor decelerates, the voltage of the generator 19 again being matched to the condenser voltage. The connection of the generator 19 in the grid circuit is reversed with the reversal of the generator field 14 by means of contacts 32, 33, operated with the reversing contactors 45, 46. A second device similar to the device 21 may be provided to rectify the other half of the alternating voltage wave, or, as shown, the field 14 may be maintained during the negative half-wave bv a rectifier 47 connected in parallel with the field, and rendered conducting by the induced voltage in the field winding.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US471361XA | 1935-03-01 | 1935-03-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB471361A true GB471361A (en) | 1937-09-02 |
Family
ID=21947252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6301/36A Expired GB471361A (en) | 1935-03-01 | 1936-03-02 | Improvements in and relating to systems of electric motor control |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR471361A (en) |
GB (1) | GB471361A (en) |
-
1914
- 1914-04-25 FR FR471361D patent/FR471361A/en not_active Expired
-
1936
- 1936-03-02 GB GB6301/36A patent/GB471361A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR471361A (en) | 1914-10-24 |
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