Rotational speed monitor

Details Rotational speed monitor Rotational speed monitor

1975-04-04

1977-02-08

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

317 5, 324161, 340263, 360 73, G11B 2112, G11B 1546, G11B 1902, G01B 356

Patent

active

040074927

ABSTRACT:
A circuit is disclosed for monitoring the velocity of a rotating member and determining when its speed is below a predetermined value. The circuit arrangement is designed to compare the rotational speed of the member with an asynchronous AC line frequency. Signals produced by the circuitry are utilized for control purposes.

REFERENCES:
patent: 3147462 (1964-09-01), Levinson et al.
patent: 3200385 (1965-08-01), Welsh
patent: 3636545 (1972-01-01), Boyd
patent: 3686565 (1972-08-01), Kelem
patent: 3757167 (1973-09-01), Yoshikawa
patent: 3893178 (1975-07-01), Sordello

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