GB108430A - Improvements in and relating to Electric Motor Control and Apparatus therefor. - Google Patents
Improvements in and relating to Electric Motor Control and Apparatus therefor.Info
- Publication number
- GB108430A GB108430A GB175417A GB175417A GB108430A GB 108430 A GB108430 A GB 108430A GB 175417 A GB175417 A GB 175417A GB 175417 A GB175417 A GB 175417A GB 108430 A GB108430 A GB 108430A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contactors
- contactor
- switches
- auxiliary
- closed
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/24—Variable impedance in stator or rotor circuit
- H02P25/26—Variable impedance in stator or rotor circuit with arrangements for controlling secondary impedance
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
108,430. British Thomson-Houston Co., and Hastings, H. C. Feb. 3, 1917. Master control systems.-In an electric motor control system with contactors operating in succession and with electro-magnetic auxiliary switches the magnetic force in which varies with the speed or back electromotive force of the motor, each auxiliary switch is mechanically interlocked with one contactor and controls the closing of the next contactor. The stator S of an induction motor is connected to the mains L<1>, L<2>, L' by a contactor 1 and resistances are cut out of the circuit of the rotor R by contactors 2, 3, 4, 5. The contactors have operating-coils C<1> - - C<5> and the first four contactors are interlocked with auxiliary. switches S<1> - - S<4>, the switches being held open when the contactors are open. The switches have windings A<1> - - A<4> connected across the slip rings K<1>, K<2> of the rotor which are set to drop their cores at different voltages. When the controller M is moved to its first position, the contactor 1 is closed and the motor starts. The auxiliary switch S<1> is released by the contactor but is held up until the current in the coil A<1> drops to a suitable value. The switch S<1> then drops and, on the controller being moved to the second position, the contactor 2 is closed. Contactors 3, 4, 5 are closed similarly. The controller may be moved to the full ' on ' position and the contactors will then close automatically. An ohmic resistance is connected in series with each auxiliary switch winding so that its current is practically independent of the frequency of the rotor currents. In an arrangement for use with direct-current motors, the windings of the auxiliary switches are connected across the motor armature and the switches are closed by the lifting of the cores as the back electromotive force rises.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB175417A GB108430A (en) | 1917-02-03 | 1917-02-03 | Improvements in and relating to Electric Motor Control and Apparatus therefor. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB175417A GB108430A (en) | 1917-02-03 | 1917-02-03 | Improvements in and relating to Electric Motor Control and Apparatus therefor. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB108430A true GB108430A (en) | 1917-08-09 |
Family
ID=32243433
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB175417A Expired GB108430A (en) | 1917-02-03 | 1917-02-03 | Improvements in and relating to Electric Motor Control and Apparatus therefor. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB108430A (en) |
-
1917
- 1917-02-03 GB GB175417A patent/GB108430A/en not_active Expired
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