Cross coil type indicator

Details Cross coil type indicator Cross coil type indicator

1989-08-04

1992-06-02

Lall, Parshotam S.

Boots, shoes, and leggings

324154R, G01R 138

Patent

active

051193205

ABSTRACT:
In a cross coil type indicator having a pair of cross coils arranged in quadrature, a magnet rotor having a shaft and a pointer attached to the shaft and rotatably positioned within the coils, the pointer is positioned to indicated a variable by flowing pulse currents through the coils in which the duty ratio is related to the variable value. Digital data corresponding to the pointer angle is stored as sin .THETA. or cos .THETA. data in a read only memory to enable simple calculation of pointer position from the duty ratio of the current pulse. A stop pin is provided to limit rotation of the pointer at the end of the scale; a circuit is provided for determining when the pointer is adjacent to the pin or will be driven against the stop pin, and the drive currents are modified in response to such conditions to reduce repetitive striking of the pin by the pointer and to minimize the force with which the pointer is driven against the pin at the stop pin end of the scale.

REFERENCES:
patent: 3946311 (1976-03-01), Baker et al.
patent: 4051434 (1977-09-01), Sweet
patent: 4230984 (1980-10-01), Taylor
patent: 4356445 (1982-10-01), Congdon
patent: 4553093 (1985-11-01), Chikasue
patent: 4890057 (1989-12-01), Kobayashi et al.
patent: 4924178 (1990-05-01), Miyajima

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