Minute impulse: Difference between revisions
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== Why not synchronous motors? == | == Why not synchronous motors? == | ||
Two problems occur with synchronous motors. First, American power companies no longer maintain a long-term average of 60 Hz line frequency because most consumers are using crystal based clocks, and critical systems are always synchronized to time standards. Secondly, automatic corrections made by speeding up the dials only | Two problems occur with synchronous motors. | ||
<br>First, American power companies no longer maintain a long-term average of 60 Hz line frequency because most consumers are using crystal based clocks, and critical systems are always synchronized to time standards. <br>Secondly, automatic corrections made by speeding up the dials only ''approximate'' the correct time. Human operations are continually required to fine tune the exact time displayed. | |||
[[Category: Clocks]][[Category: Electrical]] | [[Category: Clocks]][[Category: Electrical]] | ||