GB873050A - Improvements in and relating to the control equipment of electric hoisting motors - Google Patents
Improvements in and relating to the control equipment of electric hoisting motorsInfo
- Publication number
- GB873050A GB873050A GB3293858A GB3293858A GB873050A GB 873050 A GB873050 A GB 873050A GB 3293858 A GB3293858 A GB 3293858A GB 3293858 A GB3293858 A GB 3293858A GB 873050 A GB873050 A GB 873050A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- winding
- series
- fsh
- armature
- 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
- B66C13/24—Circuits for controlling the lowering of the load by dc motors
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
873,050. Control of D.C. motors. ASSOCIATED ELECTRICAL INDUSTRIES Ltd., and STEELS ENGINEERING PRODUCTS Ltd. Oct. 2, 1959 [Oct. 15, 1958], No. 32938/58. Class 38 (3). A hoist motor M, having a series field winding FS and an aiding separately-excited field winding FSH, is adapted to be supplied from a generator G which is driven by a variable-speed prime mover. During lowering operation, the motor acts as a generator and its armature is shunted by resistor RL, a rectifier RE being connected across the series winding FS to bypass reverse current. This prevents the winding FS from opposing the winding FSH if the generator voltage exceeds the motor voltage. For hoisting operation, the connections of the armature and series field windings of the motor are changed, the flux directions in the windings FS, FSH, remaining the same as for lowering operation. Speed control of the motor is effected by throttle control of the prime mover during both hoisting and lowering operations. During lowering, the motor is readily transferred between dynamic braking and motoring operation. In a modification, the same field winding may be connected in series with the armature, or to an external source, for hoisting and lowering operation, respectively, Figs. 1a, 1b (not shown).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3293858A GB873050A (en) | 1958-10-15 | 1958-10-15 | Improvements in and relating to the control equipment of electric hoisting motors |
| ES0252493A ES252493A1 (en) | 1958-10-15 | 1959-10-06 | Improvements in and relating to the control equipment of electric hoisting motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3293858A GB873050A (en) | 1958-10-15 | 1958-10-15 | Improvements in and relating to the control equipment of electric hoisting motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB873050A true GB873050A (en) | 1961-07-19 |
Family
ID=10346225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3293858A Expired GB873050A (en) | 1958-10-15 | 1958-10-15 | Improvements in and relating to the control equipment of electric hoisting motors |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES252493A1 (en) |
| GB (1) | GB873050A (en) |
-
1958
- 1958-10-15 GB GB3293858A patent/GB873050A/en not_active Expired
-
1959
- 1959-10-06 ES ES0252493A patent/ES252493A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES252493A1 (en) | 1960-02-01 |
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