![]() The point is that in either case the rotors must run at the same nominal frequency, and be in phase with each other. Or, it could be two motors, if an external power source were connected. The figure below could either be two paralleled and synchronized alternators driven by mechanical energy sources, or an alternator driving a synchronous motor. The figure below shows small alternators with a permanent magnet rotating field. Since motors and generators are similar in construction, it should be possible to use a generator as a motor, and conversely, to use a motor as a generator.Īn asynchronous motor is similar to an alternator with a rotating field. Large synchronous motors are a few percent more efficient than the more common induction motors, though the synchronous motor is more complex. Small Synchronous MotorsĪbove 10 Horsepower (10 kW) the higher efficiency and leading power factor make large synchronous motors useful in industry. If it falls behind by a few cycles, they will make up the lost cycles of AC so that clocks lose no time. This is due to power plant operators purposely maintaining the long term accuracy of the frequency of the AC distribution system. Though battery-powered quartz regulated clocks are widely available, the AC line operated variety has better long term accuracy-over a period of months. Single-phase synchronous motors are available in small sizes for applications requiring precise timing such as timekeeping, (clocks) and tape players.
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