Electricity: measuring and testing – Magnetic – Displacement
Patent
1993-12-22
1995-01-17
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420721, 32420725, 340671, 340683, G01B 714, G01B 730, G06F 1520
Patent
active
053829000
ABSTRACT:
Multiple output signals of rotary displacement sensors of a machine tool spindle are processed by a multi-displacement detector to detect a displacement which is different from a radial displacement in a moving direction. This results in a reduced number of displacement sensors. The multi-displacement detector includes: a moving section whose surface is continuously irregular in the moving direction; a stationary section including a plurality of sensors each outputting a signal that contains an output component whose level is proportional to a sine-wave value of a displacement in the moving direction and has an amplitude modulated in proportion to a variation in the gap from the irregular surface; and an arithmetic logic device for receiving the output signals of the plurality of sensors and for outputting signals indicative of a displacement in the moving direction and another at least one displacement of the moving section.
REFERENCES:
patent: 4629982 (1986-12-01), Kieslich
patent: 5065095 (1991-11-01), Suzuki
patent: 5155696 (1992-10-01), Shibata et al.
patent: 5220282 (1993-06-01), Zimmermann
Okuma Corporation
Patidar Jay M.
Snow Walter E.
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