GB845995A - Improvements in control systems for electric motors - Google Patents
Improvements in control systems for electric motorsInfo
- Publication number
- GB845995A GB845995A GB3243556A GB3243556A GB845995A GB 845995 A GB845995 A GB 845995A GB 3243556 A GB3243556 A GB 3243556A GB 3243556 A GB3243556 A GB 3243556A GB 845995 A GB845995 A GB 845995A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- resistor
- slip
- rings
- resistors
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
Abstract
845,995. Control of A.C. motors. BRITISH THOMSON-HOUSTON CO. Ltd. Nov. 1, 1957 [Oct. 24, 1956], No. 32435/56. Class 38 (3). An induction motor is operated at creep speed by energizing one of its windings with A.C., while the other winding is simultaneously supplied with D.C. In one arrangement, two of the slip-rings are connected through bridge rectifier 4 and transformer 5 to two phases of the A.C. supply, whilst the terminal F is connected to either terminal D or E. Thus a D.C. component is supplied to two phases of the rotor windings and these are short-circuited through the rectifier during alternate half-cycles of the supply. Variation of the creeping speed is effected by adjustable resistors 6 in series with the stator winding, and the peak voltage across the rectifier is reduced by resistor 7. The starting torque is reduced by means of resistor 8, whilst, to increase the starting torque, resistors may be connected directly between the slip-rings. In another arrangement, a rectifier 9 is connected between two of the slip-rings, and resistors 10, 11 are provided. Furthermore, a resistor may be connected in series with the rectifier between two of the phase terminals in order to reduce the torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3243556A GB845995A (en) | 1956-10-24 | 1956-10-24 | Improvements in control systems for electric motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3243556A GB845995A (en) | 1956-10-24 | 1956-10-24 | Improvements in control systems for electric motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB845995A true GB845995A (en) | 1960-08-24 |
Family
ID=10338564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3243556A Expired GB845995A (en) | 1956-10-24 | 1956-10-24 | Improvements in control systems for electric motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB845995A (en) |
-
1956
- 1956-10-24 GB GB3243556A patent/GB845995A/en not_active Expired
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