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Lavet-type stepping motor of a quartz clock. A black rotor sprocket provides the mechanical output. The Lavet-type stepping motor has widespread use as a drive in electro-mechanical clocks [1] and is a special kind of single-phase stepping motor. Both analog and stepped-movement quartz clocks use the Lavet-type stepping motor (see Quartz clock).
The Hammond Clock Company was founded in 1928 to produce and market clocks that were equipped with Hammond's new motor. The Hammond clock factory manufactured more than 100 different clock models, some simple and cheap, others made from expensive materials such as marble and onyx. [4]
The motor accelerates from slip speed to synchronous speed during an accelerating half cycle of the reluctance torque. [3] Single-phase synchronous motors such as in electric wall clocks can freely rotate in either direction, unlike a shaded-pole type. Costs are an important parameter for starters. [38]
A synchronous electric clock does not contain a timekeeping oscillator such as a pendulum or balance wheel, but instead counts the oscillations of the AC utility current from its wall plug to keep time. It consists of a small AC synchronous motor, which turns the clock's hands through a reduction gear train. [9]
These motors, however, were housed in the elegant cases of mantel and grandfather clocks for which Herschede was known; moreover, these clocks were equipped with chimes. Telechron—now the "Clock and Timer Division" of GE—declined in the 1950s, mainly because batteries had become much more long-lived and reliable.
The Bodine synchronous electric motor operates the Boston-made E. Howard & Co. clock, which is original to the Great Depression-era City Hall.
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