Rotary electric actuator with a mechanical spring return back-up
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United States of America Patent
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Aug 13, 2002
Grant Date -
N/A
app pub date -
Aug 11, 2000
filing date -
Aug 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tri-modal--energy storage mode, fail-safe mode, and operating mode--fail-safe actuator with low overall power consumption and specifically low fail-safe power consumption due to energy storage pawling mechanisms. Stored energy is discharged at a controlled rate in fail-safe mode. The actuator's sequencing through its three modes is enabled by a dual-cam/clutch system which is powered separately from the operational (shaft control) system.
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