Method for detecting position

Details Method for detecting position Method for detecting position

1988-10-24

1989-11-28

Lall, Parshotam S.

Boots, shoes, and leggings

364559, 324165, 341112, H03K 1308, G06F 1520

Patent

active

048842265

ABSTRACT:
A method is provided for detecting a position, comprising the steps of: producing two-phase sinusoidal wave signals having a 90.degree.-spatial phase difference therebetween upon movement of a moving object; detecting the current voltage V.sub.a and V.sub.b of the two-phase sinusoidal wave signals and calculating a value of .alpha. making a value of V zero, given by V=V.sub.a .multidot.cos.alpha.-V.sub.b .multidot.sin.alpha.; determining the value of .alpha. so that polarities of sin.alpha. and cos.alpha. for the calculated .alpha. coincide with those of V.sub.a and V.sub.b, respectively; and detecting a moving position of the moving object by using the value of .alpha. determined in the preceding step as absolute position data within 1 cycle of the 2-phase signals. According to the above method for detecting a position, the absolute position of a moving object can be detected with a high resolution.

REFERENCES:
patent: 4099245 (1978-07-01), Maysonett
patent: 4119958 (1978-10-01), Simon et al.
patent: 4335443 (1982-06-01), Dickey
patent: 4390865 (1983-06-01), Lauro
patent: 4449117 (1984-05-01), Fortescue
patent: 4476420 (1984-10-01), Asakawa
patent: 4583079 (1986-04-01), Simon
patent: 4587485 (1986-05-01), Papierwik

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