JPS5461750A - Speed controller for bucket crane - Google Patents

Speed controller for bucket crane

Info

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
Application number
JP12772177A
Other languages
Japanese (ja)
Other versions
JPS5940747B2 (en
Inventor
Yoshitomo Takizawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP12772177A priority Critical patent/JPS5940747B2/en
Publication of JPS5461750A publication Critical patent/JPS5461750A/en
Publication of JPS5940747B2 publication Critical patent/JPS5940747B2/en
Expired legal-status Critical Current

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
JP12772177A 1977-10-25 1977-10-25 Bucket crane speed control device Expired JPS5940747B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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