JPS5461750A - Speed controller for bucket crane - Google Patents
Speed controller for bucket craneInfo
- Publication number
- JPS5461750A JPS5461750A JP12772177A JP12772177A JPS5461750A JP S5461750 A JPS5461750 A JP S5461750A JP 12772177 A JP12772177 A JP 12772177A JP 12772177 A JP12772177 A JP 12772177A JP S5461750 A JPS5461750 A JP S5461750A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- bucket
- support motor
- speed
- unwinding
- 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.)
- Granted
Links
Landscapes
- Control And Safety Of Cranes (AREA)
Abstract
PURPOSE: To heighten the work efficiency, by rotating an open/close motor at a synchronous speed equal to the frequency produced by a support motor to rotate both the motors at almost the same speed when a bucket is opened and lowered by unwinding.
CONSTITUTION: When the bucket is opened and lowered by unwinding, electromagnetic contactors 13, 15, 16 are turned on but other electromagnetic contactors 11, 12, 17 are turned off. Releasing brakes 41, 42 in that state, the support motor 1 starts rotating by the weight of the bucket 11. A thyristor 5 is controlled by an automatic controller 4 to have a turn-on angle higher than a predetermined level no matter how a speed command relates to the speed feedback from a command power generator 3. Therefore, a direct current stornger than a predetermined level is flowing through the primary winding of the support motor. When the support motor starts rotating, its secondary winding poroduces a three-phase AC voltage propartional to the rotational frequency of the motor. Applying the three- phase AC voltage to the open/close motor 2, it rotates at a synchronous speed equal to the frequency produced by the support motor 1.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12772177A JPS5940747B2 (en) | 1977-10-25 | 1977-10-25 | Bucket crane speed control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12772177A JPS5940747B2 (en) | 1977-10-25 | 1977-10-25 | Bucket crane speed control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5461750A true JPS5461750A (en) | 1979-05-18 |
JPS5940747B2 JPS5940747B2 (en) | 1984-10-02 |
Family
ID=14967059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12772177A Expired JPS5940747B2 (en) | 1977-10-25 | 1977-10-25 | Bucket crane speed control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5940747B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61235396A (en) * | 1985-04-11 | 1986-10-20 | 三菱電機株式会社 | Bucket crane device |
US4813299A (en) * | 1979-10-26 | 1989-03-21 | Honda Giken Kogyo Kabushiki Kaishi | Automatic transmission |
-
1977
- 1977-10-25 JP JP12772177A patent/JPS5940747B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4813299A (en) * | 1979-10-26 | 1989-03-21 | Honda Giken Kogyo Kabushiki Kaishi | Automatic transmission |
JPS61235396A (en) * | 1985-04-11 | 1986-10-20 | 三菱電機株式会社 | Bucket crane device |
JPH0521834B2 (en) * | 1985-04-11 | 1993-03-25 | Mitsubishi Electric Corp |
Also Published As
Publication number | Publication date |
---|---|
JPS5940747B2 (en) | 1984-10-02 |
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