GB700474A - Improvements in speed control systems for multiphase statorfed a.c. commutator motors - Google Patents
Improvements in speed control systems for multiphase statorfed a.c. commutator motorsInfo
- Publication number
- GB700474A GB700474A GB994551A GB994551A GB700474A GB 700474 A GB700474 A GB 700474A GB 994551 A GB994551 A GB 994551A GB 994551 A GB994551 A GB 994551A GB 700474 A GB700474 A GB 700474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformer
- motor
- winding
- single phase
- control
- 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
- H02P25/28—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 using magnetic devices with controllable degree of saturation, e.g. transductors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
700,474. Control of A.C. motors. LAURENCE, SCOTT, & ELECTROMOTORS, Ltd., WOODS, J. V., and SCHWARTZ, K. K. April 8,1952 [April 27, 1951], No. 9945/51. Class 38(3) [Also in Group XXXV] Relates to single phase speed control of a polyphase commutator motor 1 which has a three phase main voltage control transformer 2 (for example an induction regulator) the secondary winding 2S of which is connected to the commutator brushes of the motor. As shown, a single phase variable voltage transformer 3 has its secondary winding 3S connected in the motor secondary circuit, its primary winding 3 Pr being connected across a fixed supply such as a phase winding SP of the motor stator. The speed regulation thus obtained by the transformer 3 is independent of the speed level provided by the adjustment of the transformer 2. In order to reduce unbalance of current the single phase control may be obtained from an auto transformer coupled to the rotor circuit of the motor through an auxiliary transformer the primary winding of which is connected between a centre tapping and an adjustable slider of the auto transformer, Fig. 1a (not shown). The injected voltage may thus be used for increasing or decreasing the speed according to the position of the adjustable slider. The motor may have a tapped auxiliary polyphase stator winding in place of the main control transformer, the single phase transformer having its secondary winding connected to a tapping in the auxiliary stator winding and included by way of an adjustable slider in the secondary circuit of the motor, Fig. 2 (not shown). The primary winding of the single phase transformer is supplied at a fixed voltage which may be derived from the auxiliary stator winding. In a further example the main control transformer has a tapped secondary winding, the single phase transformer being auto-wound and connected across one phase of the part of the tapped secondary winding which is in use, Fig. 3 (not shown). The adjusting slider of the single phase transformer may then be connected in the secondary circuit of the motor. One primary winding of the main control transformer may be supplied from the single phase transformer. The application to the control of a series polyphase motor is referred to, the supply voltage being controlled by a single phase variable voltage transformer which has an adjusting contact connected to a tapping in one primary phase winding of the main polyphase supply transformer, Fig. 4 (not shown), which may be, in turn, of the variable voltage type.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB994551A GB700474A (en) | 1951-04-27 | 1951-04-27 | Improvements in speed control systems for multiphase statorfed a.c. commutator motors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB994551A GB700474A (en) | 1951-04-27 | 1951-04-27 | Improvements in speed control systems for multiphase statorfed a.c. commutator motors |
Publications (1)
Publication Number | Publication Date |
---|---|
GB700474A true GB700474A (en) | 1953-12-02 |
Family
ID=9881675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB994551A Expired GB700474A (en) | 1951-04-27 | 1951-04-27 | Improvements in speed control systems for multiphase statorfed a.c. commutator motors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB700474A (en) |
-
1951
- 1951-04-27 GB GB994551A patent/GB700474A/en not_active Expired
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