JPS5470548A - Protective apparatus for crane - Google Patents

Protective apparatus for crane

Info

Publication number
JPS5470548A
JPS5470548A JP13537277A JP13537277A JPS5470548A JP S5470548 A JPS5470548 A JP S5470548A JP 13537277 A JP13537277 A JP 13537277A JP 13537277 A JP13537277 A JP 13537277A JP S5470548 A JPS5470548 A JP S5470548A
Authority
JP
Japan
Prior art keywords
speed
directed
motor
crane
protective apparatus
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
JP13537277A
Other languages
Japanese (ja)
Other versions
JPS551230B2 (en
Inventor
Kiyohiko Chikashige
Hiroshi Akasaki
Takeyoshi Kajita
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
Mitsubishi Heavy Industries Ltd
Nippon Steel Corp
Original Assignee
Mitsubishi Electric Corp
Mitsubishi Heavy Industries Ltd
Nippon Steel 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, Mitsubishi Heavy Industries Ltd, Nippon Steel Corp filed Critical Mitsubishi Electric Corp
Priority to JP13537277A priority Critical patent/JPS5470548A/en
Publication of JPS5470548A publication Critical patent/JPS5470548A/en
Publication of JPS551230B2 publication Critical patent/JPS551230B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control And Safety Of Cranes (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

PURPOSE: To construct a protective apparatus inexpensive and operable more effectively by direct detection of non-coincidence between the command speed and the speed of the motor, a trouble inducing a hindrance of the crane.
CONSTITUTION: A wound-rotor induction motor 1 of the crane is driven based on the speed directed by a controller 5 while the speed is detected with a directed speed dynamo 4. A difference between the actual speed and the directed speed is fed to a control coil of a saturable reactor 2 through an amplifier 6 whereby the torque of the motor is controlled. A protective apparatus of such an equipment are equipped with relays #1 to #4 serving as respective notch signals and a voltage relays S1 to S4 adapted to actuate a brake opening/closing contactor B by judging a trouble of the equipment from a state in which the speed of the motor exceeds the directed speed by more than a given value in each notch, and a timer T.
COPYRIGHT: (C)1979,JPO&Japio
JP13537277A 1977-11-11 1977-11-11 Protective apparatus for crane Granted JPS5470548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13537277A JPS5470548A (en) 1977-11-11 1977-11-11 Protective apparatus for crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13537277A JPS5470548A (en) 1977-11-11 1977-11-11 Protective apparatus for crane

Publications (2)

Publication Number Publication Date
JPS5470548A true JPS5470548A (en) 1979-06-06
JPS551230B2 JPS551230B2 (en) 1980-01-12

Family

ID=15150170

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13537277A Granted JPS5470548A (en) 1977-11-11 1977-11-11 Protective apparatus for crane

Country Status (1)

Country Link
JP (1) JPS5470548A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882307U (en) * 1981-11-30 1983-06-03 株式会社吉野工業所 Synthetic resin bottle
JPH041576U (en) * 1990-04-17 1992-01-08

Also Published As

Publication number Publication date
JPS551230B2 (en) 1980-01-12

Similar Documents

Publication Publication Date Title
JPS5470548A (en) Protective apparatus for crane
JPS52147717A (en) Speed controller for motors
JPS5455948A (en) Apparatus for controlling grounding speed of suspended cargo
JPS5684162A (en) Pinch roll speed control device of cotinuous casting equipment
JPS5470547A (en) Protective apparatus for crane
JPS531791A (en) Controlling device for control rod driving in reactor
GB979475A (en) Limit control for electric motors
JPS5551902A (en) Automatic tracking device for load limiter
JPS5419114A (en) Controller for induction motor
JPS5529237A (en) Exciter for synchronous generator
JPS5513610A (en) Controller for current-type inverter
JPS53135001A (en) Driving system for turbo-machines
JPS54721A (en) Constant output controller for motor
JPS5388911A (en) Speed control brake controller
JPS5399410A (en) Controller for thyristor motor
JPS5219221A (en) Speed control apparatus for induction motors
JPS51115616A (en) Speed control system of induction motor
JPS5753264A (en) Automatic centrifugal separator
JPS5239208A (en) Apparatus for automatically detecting and controlling abnormal speed o f vehicles
JPS5497561A (en) Rolling mill
JPS54150628A (en) Emergency operation device of wound-rotor induction motor
JPS5698384A (en) Speed control system for motor
JPS52143645A (en) Control device for elevator
JPS5320518A (en) Controller of commutator-less motor
JPS56136103A (en) Rolling preventive brake instruction device of vehicle