Title:
METHOD AND DEVICE FOR MONITORING ELECTRIC DRIVING DEVICE AND/OR CONTROLLING ROTATIONAL NUMBER
Document Type and Number:
Japanese Patent JP3803128
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent lowering sudden and large causing unacceptable danger to a human or an object even when a load is in an any position by adjusting maximum torque generated by a lifting driving device for lifting a load to be small compared with the stopping torque of a brake system.
SOLUTION: An asynchronous motor 1 drives or brakes a rope drum 3 via a transmission 2, and a load 5 is suspended on the rope 4 of the rope drum 3. The rotational speed gauge 6a of a pulse generator 6 is connected to the asynchronous motor 1, and the pulse 7 of the rotational speed gauge 6a is led to a rotational speed controller 9 via a first control line 8. A brake 11 for the asynchronous motor 1 is connected to this rotational speed controller 9 via a second control line 10. Compared with the stopping torque of this brake, maximum torque generated by a lifting driving device for lifting a load is adjusted to be small.
Inventors:
Holger Freitak
Anton Munzeblock
Anton Munzeblock
Application Number:
JP30201595A
Publication Date:
August 02, 2006
Filing Date:
October 26, 1995
Export Citation:
Assignee:
Demark Cranes & Components Gesellschaft Mitt Beschlenktel Haftung
International Classes:
B66D1/12; B66D1/58; B66C13/26; B66D1/48; H02P27/04; (IPC1-7): B66D1/58; B66D1/12; H02P7/628
Domestic Patent References:
| JP10087176A |
Attorney, Agent or Firm:
Shoichi Okuyama
Arihara Koichi
Matsushima Tetsuo
Arihara Koichi
Matsushima Tetsuo
Previous Patent: PRODUCTION OF OPTICALLY ACTIVE TRANS-ISOMER VINYL SULFIDOALCOHOL
Next Patent: PRINTING UNIT SWITCHING DEVICE
Next Patent: PRINTING UNIT SWITCHING DEVICE