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Small synchronous motor with integral stepdown gear from a microwave oven. A synchronous electric motor is an AC electric motor in which, at steady state, [1] the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integer number of AC cycles.
Some electric clocks have a simple two-pole synchronous motor which runs at one revolution per cycle of power, i.e., 3600 RPM at 60 Hz and 3000 RPM at 50 Hz. [10] However most electric clocks have rotors with more magnetic poles (teeth), consequently rotating at a smaller submultiple of line frequency.
The electric clock market grew rapidly in the 1930s, and Telechron's patented power interruption indicator gave his clocks an advantage over competing synchronous clocks, but by the 1950s battery-operated clocks that weren't dependent on the power grid took market share, and in the 1960s the quartz clock replaced synchronous clocks.
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 ]
An electric motor (often synchronous, if directly connected to the AC line) turns two sets of wheels continuously via a reduction gear train: the faster at a rate of 1 revolution per hour, the slower at a rate of 1 revolution per 24 hours. The wheels move continuously, not in steps. Mechanism of a split-flap alarm clock, removed from its case.
During the 1970s, many of the mechanical clocks were changed to use the electric motors made by the Smith parent company. However, J. B. Joyce continued to operate as a separate company, with mainly heritage work being carried out in the factory up to 2012, when a timed-bid auction was held to sell off surplus equipment, tools, and clock parts ...
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