Title:
APPARATUS FOR DETECTING ROTATING STATE OF ROTARY SHAFT
Document Type and Number:
Japanese Patent JPH04177115
Kind Code:
A
Abstract:
PURPOSE:To accurately detect the rotating position of a rotary shaft by provid ing the first and second exciting means to a long magnetic body at shifted positions and applying exciting currents different in frequency to both exciting means to generate magneto-elastic waves different in frequency. CONSTITUTION:The first exciting coils 5a, 5b and the second exciting coils 6a, 6b are provided so as to be mutually shifted by a predetermined intervals and magneto-elastic waves having different frequencies f1Hz, f2Hz are excited in a magnetic body 4. By this method, the rotary position of a rotary shaft 1 becoming difficult in detection can be detected so as to be compensated by the synthetic magneto-elastic waves respectively excited by the first or second exciting coils and detection accuracy can be enhanced.
Inventors:
TAJIMA KOICHI
SHIMOMURA EIJI
SHIMOMURA EIJI
Application Number:
JP30465690A
Publication Date:
June 24, 1992
Filing Date:
November 09, 1990
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
G01B17/00; (IPC1-7): G01B17/00
Attorney, Agent or Firm:
Tsuyoshi Sato (2 outside)
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