GB628828A - Improvements in control systems for electric motors - Google Patents
Improvements in control systems for electric motorsInfo
- Publication number
- GB628828A GB628828A GB2826746A GB2826746A GB628828A GB 628828 A GB628828 A GB 628828A GB 2826746 A GB2826746 A GB 2826746A GB 2826746 A GB2826746 A GB 2826746A GB 628828 A GB628828 A GB 628828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- machine
- current
- line
- metadyne
- winding
- 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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/68—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more dc dynamo-electric motors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Charge By Means Of Generators (AREA)
Abstract
628,828. Exciting dynamo-electric machines. HOLLYER, E. B., and METROPOLITANVICKERS ELECTRICAL CO., Ltd. Sept. 20, 1946, No. 28267. [Class 35] [Also in Group XXXVII] In the type of control system wherein the motors are supplied with constant or controlled currents by varying the field excitation of dynamo-electric machines through which the motors are energized from the line, means are provided for limiting the line current to a pre-determined value. Such means comprise means for producing a voltage or current dependent on, or representative of, the line current acting in opposition to a standard or reference voltage or current in a circuit including a rectifier and a controlling element governing the operation of the motor by control of the dynamo-electric machine through which the motor is adapted to be supplied from the line, said rectifier operating for line currents below a given value to prevent said voltage or current dependent on, or representative of, the line current from acting on the system through said controlling element, but when said line current rises above said given value to allow an energization of said element producing a correcting effect on the line current tending to maintain the latter at said given value. A metadyne transformer MT supplies traction motors M1 and M2 and is provided with a regulator machine RD which is mechanically coupled to the metadyne and which is connected to a field winding RW thereof con. trolling the primary current of the machine MT. The winding RW is connected in series with the machine RD and a battery B, the voltages .of the machine and battery being balanced when the speed of the machine MT is at a desired value. Any deviation of the speed of the main machine from the desired value will so vary the output of the machine RD, and the excitation of the winding RW, that the metadyne primary current, is altered to remove such deviation. The metadyne is provided with a main control winding C and an opposing field winding C1 controlling the secondary current of the machine. The field winding C1 is adapted to be energized to reduce the metadyne secondary current, by the applica. tion of the difference of the voltage of the machine RD and of that across a portion of the tapped resistor P shunting the battery B, when the voltage of the regulating machine falls due to a decrease of metadyne speed in the event of excessive primary current being taken from the line, so restoring the primary current to a desired lower value. A rectifier R prevents energization of the winding C1 during normal operation. Fig. 2 (not shown), illustrates the application to a metadyne transformer as described in Specification 628,827. When the system is adapted to control the maximum current returned to the line during regenerative operation, the resistor P is connected across the regulator machine RD, and the rectifier R is arranged to allow passage of current from the negative terminal of the battery B through the winding C1 to the resistor P, Fig. 3 (not shown). A system effective for both motoring and regenerative operation is afforded, Fig. 4 (not shown). Switches may be employed to interchange the motoring and regenerative connections. The system may be applied to an arrangement such as that according to Specification 628,831, Fig. 5 (not shown), an additional rectifier being connected between windings RW and C1 so that these windings are connected in parallel when the voltage of the machine RD exceeds that of the source B.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2826746A GB628828A (en) | 1946-09-20 | 1946-09-20 | Improvements in control systems for electric motors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2826746A GB628828A (en) | 1946-09-20 | 1946-09-20 | Improvements in control systems for electric motors |
Publications (1)
Publication Number | Publication Date |
---|---|
GB628828A true GB628828A (en) | 1949-09-06 |
Family
ID=10272946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2826746A Expired GB628828A (en) | 1946-09-20 | 1946-09-20 | Improvements in control systems for electric motors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB628828A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0578567A1 (en) * | 1992-07-09 | 1994-01-12 | Valeo Thermique Moteur | Speed commutation device for two electric motors with different speeds |
-
1946
- 1946-09-20 GB GB2826746A patent/GB628828A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0578567A1 (en) * | 1992-07-09 | 1994-01-12 | Valeo Thermique Moteur | Speed commutation device for two electric motors with different speeds |
FR2693605A1 (en) * | 1992-07-09 | 1994-01-14 | Valeo Thermique Moteur Sa | Switching device for controlling two electric motors at different speeds. |
US5371445A (en) * | 1992-07-09 | 1994-12-06 | Valeo Thermique Moteur | Switching device for controlling two electric motors at different speeds |
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