Precision speed switch control

Details Precision speed switch control Precision speed switch control

G - Physics

05

B

342/16

G05B 11/01 (2006.01) G01P 3/46 (2006.01) G01R 23/00 (2006.01) H03K 17/97 (2006.01)

Patent

CA 1096474

S/Start 105 PRECISION SPEED SWITCH CONTROL Abstract of the Disclosure A speed switch control comprising a subfractional permanent magnet AC generator generating an AC signal varying in amplitude with shaft 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.

312101

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