Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1989-08-22
1991-05-28
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
32420725, 364565, G01P 3489, G01P 348, G01B 730, H02P 700
Patent
active
050197738
ABSTRACT:
Sine wave signals generated from a position detector are used as analog values to detect a fine position of a rotating or moving body, a rise or fall edge of the sine wave signal is used to detect a coarse position of the rotating or moving body, and the position or speed of the rotating or moving body is detected based on a signal indicative of the detected coarse position when the rotating or moving body is at high speed and based on a signal indicative of the detected fine position when the rotating or moving body is at low speed to thereby provide optimal control from high speed to low speed. Especially at extremely low driving, speed detection with superhigh resolution is effected using the analog value to decrease an uneven rotation of the rotating body.
REFERENCES:
patent: 4560927 (1985-12-01), Ishida et al.
patent: 4680721 (1987-07-01), Pluddemann
patent: 4808933 (1989-02-01), Kobayashi et al.
patent: 4839834 (1989-06-01), Omae et al.
patent: 4847555 (1989-07-01), Stammer et al.
Kobayashi Sumio
Miyashita Kunio
Mutoh Nobuyoshi
Nagase Hiroshi
Oue Rika
Hitachi , Ltd.
Strecker Gerard R.
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