Extra magnetic field positioning apparatus

Details Extra magnetic field positioning apparatus Extra magnetic field positioning apparatus

1987-10-06

1989-09-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

318640, G01D 534

Patent

active

048641251

ABSTRACT:
An extra magnetic field positioning apparatus includes a motor which does not have stable points for defining the extra magnetic field. An encoder is provided which is rotated with the motor and individually has the information which indicates rotating displacement and the information which indicates rotating position. Further, a sensor detects the information indicating the rotating position recorded on the encoder, and another sensor detects the information indicating the rotating displacement recorded on the encoder.

REFERENCES:
patent: 4184107 (1980-01-01), Turini et al.
patent: 4514674 (1985-04-01), Hollis, Jr. et al.
patent: 4684857 (1987-08-01), Llopis

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