Precision speed switch control

Details Precision speed switch control Precision speed switch control

1977-10-04

1979-09-18

Salce, Patrick R.

Electricity: electrical systems and devices

Electrical speed signal processing systems

Two position

361 51, H02P 300

Patent

active

041685164

ABSTRACT:
A speed switch control comprising a subfractional permanent magnet AC generator generating an AC signal varying in amplitude with saft speed variations; the AC signal is rectified and compared with a regulated DC reference to generate first and second threshold signals indicative of shaft speeds over and under a critical value. A switch actuator circuit develops "on" and "off" switch actuator signals, from the threshold signals to actuate a two-terminal solid state switch between on and off conditions; the "off" signal is continuous but the "on" signal is a high-duty-cycle semi-continuous signal including brief recurring "off" intervals. A power storage/supply circuit, connected in parallel with the switch terminals, which recharges during switch "off" intervals, affords the power supply for the threshold and switch actuator circuits.

REFERENCES:
patent: 3207950 (1965-09-01), Smith
patent: 3440433 (1969-04-01), Coman
patent: 3805161 (1974-04-01), Bayha et al.
patent: 3845375 (1974-10-01), Stiebel

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