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Accurate Clock Pendulums$
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Robert J. Matthys

Print publication date: 2004

Print ISBN-13: 9780198529712

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198529712.001.0001

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An electronically driven pendulum

An electronically driven pendulum

Chapter:
(p.223) Chapter 32 An electronically driven pendulum
Source:
Accurate Clock Pendulums
Author(s):

Robert James Matthys

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198529712.003.0032

An electromagnetically driven pendulum is more accurate than a mechanically (escapement) driven pendulum. This is because a pendulum is disturbed less by an electromagnetic drive pulse than by hitting and dragging a pallet across an escape wheel's tooth. This is empirically based on Q —the less disturbed a pendulum is, the more accurate it will be. A short drive pulse at the center of swing is superior to the continuous sine wave drive approach. This is due to the difficulty in avoiding spurious electrical drive currents at the ends of swing, where unwanted low level electrical currents in a continuous sine wave drive can cause significant time errors over long time intervals. In this clock, the pendulum is electronically driven by a short current pulse in each drive coil at the center of swing. This chapter describes some features of an electromagnetically driven pendulum clock. The clock's mechanical layout is presented.

Keywords:   pendulum, driven pendulum clock, electromagnetic drive pulse, electrical currents, swing, drive coil

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