Electronic velocity measurement device

Details Electronic velocity measurement device Electronic velocity measurement device

1978-09-29

1981-01-20

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including motor current or voltage sensor

360 75, G01P 346, G11B 2102

Patent

active

042465362

ABSTRACT:
An improved electronic velocity measurement device for an accessing type disk drive combines a differentiated cyclically discontinuous displacement (position error) signal (PES) with integrated motor current signals to produce an accurate continuous velocity signal over the entire range of displacements of a linear actuator. Differentiation of the displacement signal is achieved by low bandwidth differentiator circuitry that is corrected for periodic reversal of the displacement signal by a unique fill-in signal derived from integrated motor current. In a specific embodiment, the fill-in signal is derived by the use of a second differentiator using a second displacement signal in space quadrature with the primary displacement signal.

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patent: 3811091 (1974-05-01), Ha et al.
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patent: 4115823 (1978-09-01), Commander et al.
patent: 4133011 (1979-01-01), Kurzweil
patent: 4138728 (1979-02-01), Tung
patent: 4168457 (1979-09-01), Rose

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