GB636661A - Improvements in or relating to d.c. electric motor control circuits - Google Patents
Improvements in or relating to d.c. electric motor control circuitsInfo
- Publication number
- GB636661A GB636661A GB10065/44A GB1006544A GB636661A GB 636661 A GB636661 A GB 636661A GB 10065/44 A GB10065/44 A GB 10065/44A GB 1006544 A GB1006544 A GB 1006544A GB 636661 A GB636661 A GB 636661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- voltage
- motor
- potentiometer
- rectifier
- 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
-
- 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
- H02P7/24—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 discharge tubes or semiconductor devices
- H02P7/28—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 discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—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 discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/292—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 discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
- H02P7/293—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 discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC using phase control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Direct Current Motors (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
636,661. Automatic speed control systems; rectifying. STEVENS, A. H. (Submarine Signal Co.). May 24, 1944, No. 10065. [Classes 38 (ii) and 38 (iv)] [Also in Group XXXVII] In a system for automatically controlling the speed of a D.C. motor, a negative bias, applied to the grid of a gaseous rectifier valve supplying the armature, falls during the positive halfcycle of the alternating voltage applied to the anode, and the rate of change and magnitude of the bias is controlled by the motor speed and torque. In Fig. 1 the armature of a D.C. motor 1 is supplied from A.C. mains 2, 2 through a gaseous triode rectifier valve 3. The grid bias of valve 3 is developed across a resistor 13 by the anode current of a vacuum triode thermionic valve 7, the anode-cathode voltage of which is supplied partly from the voltage across a condenser 11, charged through a diode 8 from a secondary winding 10 on a mains transformer 9, and partly from a potentiometer 14 connected across the motor armature. The anode supply to valve 8 is in phase opposition to the anode supply to valve 3 so that condenser 11 is charged during the early portion of the half-cycle during which valve 3 does not conduct. During the next half-cycle condenser 11 is discharging through a resistor 12 and the anode voltage of valve 7 falls until, at a point determined by the grid voltage of valve 7, the voltage across resistor 13 permits conduction of valve 3 to supply armature current for the remainder of the half-cycle. The grid bias of valve 7 is constituted by the output of a potentiometer 17 supplying, as negative bias, a constant D.C. reference voltage obtained through a full-wave rectifier valve 19 from secondary winding 10<1> on transformer 9, acting in opposition to the output of potentiometer 14 supplying, as positive bias, a voltage proportional to the motor speed. Potentiometer 17 is the primary means for setting the motor speed, any deviation from the speed chosen causing a variation in one sense or the other of the opposition voltage from potentiometer 14 to advance or retard the point of conduction of valve 3 to correct the speed automatically. By appropriate choice of the setting of potentiometer 14 the motor can be given a level or rising speed-torque characteristic. The motor field winding is separately excited through a rectifier 30 from a secondary winding 31 on transformer 9 and the motor may be reversed by means of a field reversing switch 20. As shown, the motor is inoperative, the voltage across a resistor 32 in series with a resistor 33 across the field supply biassing rectifier 19 negatively so that the voltage across potentiometer 17 is zero, valve 7 is conductive and valve 3 non-conductive. To start the motor, a switch 38 is closed and a condenser 35 discharges to zero through a resistor 36 so that the grid bias on rectifier 19 is removed gradually and dangerous surges avoided. The reference voltage for the grid circuit of valve 7 may be obtained from a separate D.C. source and the opposing voltage,. proportional to the motor speed, may be obtained from a tachometer generator. In Fig. 2 (not shown) a full-wave valve rectifier controlled in a similar manner supplies the armature current. Characteristic curves and operating data are given.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB10065/44A GB636661A (en) | 1944-05-24 | 1944-05-24 | Improvements in or relating to d.c. electric motor control circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB10065/44A GB636661A (en) | 1944-05-24 | 1944-05-24 | Improvements in or relating to d.c. electric motor control circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB636661A true GB636661A (en) | 1950-05-03 |
Family
ID=9960791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10065/44A Expired GB636661A (en) | 1944-05-24 | 1944-05-24 | Improvements in or relating to d.c. electric motor control circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB636661A (en) |
-
1944
- 1944-05-24 GB GB10065/44A patent/GB636661A/en not_active Expired
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