GB644268A - Improvements in and relating to a.c. motors for cranes and other load raising and lowering apparatuese - Google Patents
Improvements in and relating to a.c. motors for cranes and other load raising and lowering apparatueseInfo
- Publication number
- GB644268A GB644268A GB2397148A GB2397148A GB644268A GB 644268 A GB644268 A GB 644268A GB 2397148 A GB2397148 A GB 2397148A GB 2397148 A GB2397148 A GB 2397148A GB 644268 A GB644268 A GB 644268A
- Authority
- GB
- United Kingdom
- Prior art keywords
- load
- brake
- motor
- controller
- current
- 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
- 230000006698 induction 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 And Safety Of Cranes (AREA)
Abstract
644,268. Control of A.C. motors. SMELLIE & PARTNERS, Ltd., J. H., and SMELLIE, J. H. Sept. 13, 1948, No. 23971. [Class 38(iii)] A three-phase induction hoist motor A has a controller B in the first hoisting- position of which contactors E and D are closed respectively to energize the stator and to remove an electro-magnetic brake C. Thereafter, the controller is moved to reduce rotor resistance H. When the controller is moved to the first lowering notch a contactor G is closed and the stator is supplied with direct-current through transformer K and rectifier L. The brake is removed, so that the motor rotates under the action of its load at a creeping speed which may be increased by increasing the resistance of the rotor circuit. The motor is driven in the lowering direction when the controller is adjusted to its last lowering notch, the contactor G being opened, all or part of the resistors H being restored to the rotor circuit, and contactor F closed for appropriate energization of the motor stator. If the current generated by the motor when driven by its load becomes excessive, a relay-coil m in the rotor circuit operates a switch M to de-energize the brake contactor coil d. So that, when the load is lowered out of control, the brake is applied to stop the motor and then the coil m is de-energized to remove the brake. The load is then lowered at a speed determined by the position of the controller, and, if control of the load is again lost, the cycle of operations is repeated. The relay m is rendered ineffective during hoisting-operation. To obtain uniform lowering speed with various loads, a transformer P is included in the rotor circuit and rectified current is supplied to coils r1, r2, r3, of relays R1, R2, R3, which control resistor S in the circuit through which direct-current is supplied to the motor stator. The relays R1, R2, R3, are operative at different current-values so that the resistor S is adjusted in accordance with the load. Failure of current passing through relaycoil t opens contact T to apply the brake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2397148A GB644268A (en) | 1948-09-13 | 1948-09-13 | Improvements in and relating to a.c. motors for cranes and other load raising and lowering apparatuese |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2397148A GB644268A (en) | 1948-09-13 | 1948-09-13 | Improvements in and relating to a.c. motors for cranes and other load raising and lowering apparatuese |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB644268A true GB644268A (en) | 1950-10-04 |
Family
ID=10204344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2397148A Expired GB644268A (en) | 1948-09-13 | 1948-09-13 | Improvements in and relating to a.c. motors for cranes and other load raising and lowering apparatuese |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB644268A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121903A (en) * | 1982-05-11 | 1984-01-04 | Yngve Eero | Connector |
-
1948
- 1948-09-13 GB GB2397148A patent/GB644268A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121903A (en) * | 1982-05-11 | 1984-01-04 | Yngve Eero | Connector |
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