Patent
Watch movement driven by a spring and regulated by an electronic circuit
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TLDR
In this paper, an electronically regulated watch movement comprising a time wheel mechanism driven by a drive, a generator being coupled to the drive via at least a portion of the time-wheel mechanism and with substantial gear reduction is presented.Abstract:
An electronically regulated watch movement comprising a time-wheel mechanism driven by a drive, a generator being coupled to the drive via at least a portion of the time-wheel mechanism and with substantial gear reduction. The generator includes a rotor with magnets and coils for producing a.c. voltage at a frequency of operation FG. An electronic regulating circuit is connected to the generator and includes an oscillator for producing a precise reference frequency FR and a comparator having inputs receiving frequencies FR and FG to compare the same. A power source is connected to the comparator and the generator to supply current to the generator when FG > FR to brake the generator until FG = FR and thereby provide a regulated operation of the time-wheel mechanism.read more
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References
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Patent
Electrical oscillation generators
TL;DR: In this paper, the authors proposed a pulse generator which need not be "locked" from alternating current mains or from any other source of controlling, such as a power supply.
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System for maintaining oscillations in an electric timing mechanism having an oscillatory element
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Time error corrector for automatically maintaining average frequency of a.c. source constant
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