GB743741A - Improvements in polyphase dynamo-electric machines - Google Patents
Improvements in polyphase dynamo-electric machinesInfo
- Publication number
- GB743741A GB743741A GB1894753A GB1894753A GB743741A GB 743741 A GB743741 A GB 743741A GB 1894753 A GB1894753 A GB 1894753A GB 1894753 A GB1894753 A GB 1894753A GB 743741 A GB743741 A GB 743741A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speed
- winding
- windings
- pole
- produces
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/22—Control systems or devices for electric drives
- B66C13/23—Circuits for controlling the lowering of the load
- B66C13/26—Circuits for controlling the lowering of the load by ac motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
- B66C2700/081—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists with ac motors
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
743,741. Induction motors. BRITISH THOMSON-HOUSTON CO., Ltd. May 7, 1954 [July 8, 1953], No. 18947/53. Class 35. An induction motor, for driving cranes &c., is wound with two alternatively energizable stator windings 3, 4 of different pole numbers, and corresponding rotor windings 8, of low resistance connected to controlling resistance 11, and 9 of high resistance and permanently short circuited. The short-circuited winding 9 is of lower pole-number, i.e. produces a higher speed for driving the crane when unloaded and comprises a series of coils each shorted on itself and of such a pitch that they are not influenced by the higher pole-number, while the winding 8, which produces a lower speed is also used under load. Speed control in normal working is achieved by energizing the low-speed and high-speed windings in reverse rotations, and regulating the torque of winding 8 by means of rheostat 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1894753A GB743741A (en) | 1953-07-08 | 1953-07-08 | Improvements in polyphase dynamo-electric machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1894753A GB743741A (en) | 1953-07-08 | 1953-07-08 | Improvements in polyphase dynamo-electric machines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB743741A true GB743741A (en) | 1956-01-25 |
Family
ID=10121172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1894753A Expired GB743741A (en) | 1953-07-08 | 1953-07-08 | Improvements in polyphase dynamo-electric machines |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB743741A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4736147A (en) * | 1985-04-01 | 1988-04-05 | Huazhong Institute Of Technology | Method of starting motors by harmonics and electrical motors started by this method |
-
1953
- 1953-07-08 GB GB1894753A patent/GB743741A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4736147A (en) * | 1985-04-01 | 1988-04-05 | Huazhong Institute Of Technology | Method of starting motors by harmonics and electrical motors started by this method |
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