GB637012A - Improvements in or relating to systems for the automatic speed control of electric motors - Google Patents
Improvements in or relating to systems for the automatic speed control of electric motorsInfo
- Publication number
- GB637012A GB637012A GB21962/45A GB2196245A GB637012A GB 637012 A GB637012 A GB 637012A GB 21962/45 A GB21962/45 A GB 21962/45A GB 2196245 A GB2196245 A GB 2196245A GB 637012 A GB637012 A GB 637012A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- valve
- speed
- contacts
- resistor
- 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
- H02P7/26—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 discharge tubes
- H02P7/265—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 discharge tubes whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
637,012. Automatic control systems for D.C. motors. IGRANIC ELECTRIC CO., Ltd. Aug. 27, 1945, No. 21962. Convention date, Aug. 31, 1944. [Class 38 (iv)] The speed of a D.C. motor is maintained at a predetermined level by a variable resistor, in series with the armature, which is set automatically by a reversible motor, the direction of rotation of which is determined by electronic means, by the change in the main motor speed. In the embodiment, the armature 10a of motor 10 is supplied through resistor 13a from busbars L1, L2, across which the shunt field 10b is connected. Cross-head 13c, moved. on a screw shaft 13g by reversible motor 14, varies the proportion of resistor 13a inserted in series with armature 10a. The motor 14 rotates in a direction depending upon which of fields 14b, 14c, is energized by the relays 15, 16, which are excited from the thermionic switching circuit comprising valves 32, 26, 35, 37. The appropriate switching sequence of valves 32, 26, 35, 37 is determined by the value of a D.C. voltage supplied to the thermionic switch from a tachometer generator 11, driven by motor 10. Valves 26, 32 are connected between lines 23, 22, the former having a positive potential and the latter being earthed. Valves 35, 37 are connected between lines 24, 23, the former being positive with respect to, the latter. To operate the system, push-button 18 is closed and relay 17 energized, thus closing contacts 17b, 17c and energizing coil 12a. Switch 12c opens and 12b shuts connecting armature 10a to the mains. The voltage delivered by tachometer 11 is zero and the voltage of grid 26c is therefore negative with respect to cathode 26a which is connected to tapping 28a of speed-adjusting rheostat 28, and the valve 26 conducts only slightly. The voltage of anode 26b and consequently of grid 32c is thus positive, causing valve 32 to conduct, rendering the grid 37c negative and valve 37 non-conducting. Valve 35 passes sufficient current under these conditions to energize coil 21a closing contacts 21 to operate relay 16 through coil 16a. Contacts 16b close, the field 14b is excited and the cross-head 13c moves to the left as the motor 10 accelerates. The tachometer speed, and therefore the voltage of grid 26c, rises, the valve 26 conducts, the potential of anode 26b falls, reducing the current passed by valve 35, until opening of the contacts 21b, and 16b stops motor 14 when the setting of resistor 13a is such as to permit motor 10 to run at the speed corresponding to the position of tapping 28a. If the acceleration of motor 10 does not cease, the curent passed by valve 37 rises to close contacts 20b which cause winding 14c to be energized and cross-head 13c is moved in the reverse direction. Changes in the speed of motor 10 from the datum result in either valve 37 or 35 conducting to cause the appropriate corrective movement of cross-head 13c along resistor 13a. Hunting is eliminated by the short-circuiting of resistors 27, 29, by contacts 15c, 16c when relays 15, 16 are energized.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US637012XA | 1944-08-31 | 1944-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB637012A true GB637012A (en) | 1950-05-10 |
Family
ID=22050926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21962/45A Expired GB637012A (en) | 1944-08-31 | 1945-08-27 | Improvements in or relating to systems for the automatic speed control of electric motors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB637012A (en) |
-
1945
- 1945-08-27 GB GB21962/45A patent/GB637012A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
USRE25203E (en) | Motor control system | |
US2297719A (en) | Control circuit | |
GB637012A (en) | Improvements in or relating to systems for the automatic speed control of electric motors | |
US2428702A (en) | Electronic motor control | |
US2454107A (en) | Servo mechanism | |
US2785368A (en) | Electronic motor controllers | |
US1614192A (en) | System of distant control | |
GB1048705A (en) | Improvements in or relating to speed control circuits for electric motors | |
US3495143A (en) | Plural motor control system including a remote positioning motor and a local indicating motor synchronous therewith | |
US2364486A (en) | Control system | |
US3058044A (en) | Speed-regulating system | |
GB1079525A (en) | Speed control system for centrifuge motors and the like | |
US3197687A (en) | Automatic braking device for direct current motors | |
US2598826A (en) | Electric motor control | |
US2407866A (en) | Control system | |
US2305341A (en) | Motor controller | |
US2508172A (en) | Motor speed control system | |
GB642895A (en) | Improved apparatus for the control of energy supplied to an electrical translating device | |
US1421261A (en) | Control system | |
US2597408A (en) | Electric motor control | |
GB628749A (en) | Improvements in or relating to systems for the control of polyphase electric motors | |
GB494727A (en) | Improvements in and relating to control systems for automatically controlling the speed of electric motors | |
US1297096A (en) | Starting direct-current motors. | |
US2367938A (en) | Motor control system | |
GB710415A (en) | Improvements in or relating to electric circuits for controlling direct-current motors during the starting period |