Title:
CENTRIFUGAL MACHINE WITH OVERSPEED PROTECTION DEVICE
Document Type and Number:
Japanese Patent JP3533874
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an overspeed protection mechanism and the control thereof for providing the safety for users.
SOLUTION: An overspeed sensing disk 2 is provided on a rotor and signal frequencies for the disk are sensed on respectively separated circuits of an CPU 6 and an analog circuit 10. Shutoff signals of an energy supply connection circuit to a motor after sensing are outputted from respective circuits to double monitor the overspeed allowable rotational speed, prevent the overspeed of the rotor and secure the safety.
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Inventors:
Kido, Shinji
Numata, Tetsushiyuu
Unno, Kouji
Numata, Tetsushiyuu
Unno, Kouji
Application Number:
JP6087597A
Publication Date:
May 31, 2004
Filing Date:
March 14, 1997
Export Citation:
Assignee:
HITACHI KOKI CO LTD
International Classes:
B04B9/10; B04B13/00; G01P3/486; H02H7/093; (IPC1-7): B04B9/10; B04B13/00