GB826987A - Improvements in speed control mechanism for a.c. motor - Google Patents
Improvements in speed control mechanism for a.c. motorInfo
- Publication number
- GB826987A GB826987A GB3104156A GB3104156A GB826987A GB 826987 A GB826987 A GB 826987A GB 3104156 A GB3104156 A GB 3104156A GB 3104156 A GB3104156 A GB 3104156A GB 826987 A GB826987 A GB 826987A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- controller
- relays
- reversal
- oct
- 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
- 230000005484 gravity Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
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
826,987. Electric motor control systems. CLARKE CHAPMAN & CO. Ltd., and HOWLETT, F. C. Oct. 2, 1957 [Oct. 11, 1956], No. 31041/56. Class 38 (3). [Also in Group XXXV] In a creep speed control arrangement for an A.C. winch or hoist motor comprising an electromagnetically released brake acting on the shaft of the motor a D.C. motor coupled to the shaft is connected in series with the brake coil in a direction whereby the braking effect is increased owing to the change in B.E.M.F. as the speed of the A.C. motor increases. D.C. motor 14 which is driven by the three-phase motor 1 is inserted in series with braking coil 18 on the initial steps of controller 13 during hoisting or lowering by relays HC or LC respectively, the brake coil 18 being fed from across two phases of the motor supply through a transformer 16 and rectifier 17. A resistance 19 is substituted for the D.C. generator on the last two steps of the controller. The insertion of rotor resistances 5, 6 is controlled by relays 10-12. A development of a controller drum suitable for gravity lowering is described with reference to Fig. 2 (Provisional) (not shown), and a system using a cross-field D.C. motor whereby reversal of the control circuit with reversal of the motor direction is avoided, is described with reference to the Figure accompanying the Complete Specification (not shown).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3104156A GB826987A (en) | 1956-10-11 | 1956-10-11 | Improvements in speed control mechanism for a.c. motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3104156A GB826987A (en) | 1956-10-11 | 1956-10-11 | Improvements in speed control mechanism for a.c. motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB826987A true GB826987A (en) | 1960-01-27 |
Family
ID=10317064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3104156A Expired GB826987A (en) | 1956-10-11 | 1956-10-11 | Improvements in speed control mechanism for a.c. motor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB826987A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO333886B1 (en) * | 2010-04-13 | 2013-10-14 | Rolls Royce Marine As | Safety device for Lifting devices |
-
1956
- 1956-10-11 GB GB3104156A patent/GB826987A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO333886B1 (en) * | 2010-04-13 | 2013-10-14 | Rolls Royce Marine As | Safety device for Lifting devices |
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