synchronous motor

noun Electricity.
a synchronous machine that acts as a motor.

Origin:
1900–05

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World English Dictionary
synchronous motor
 
n
an alternating-current motor that runs at a speed that is equal to or is a multiple of the frequency of the supply

Collins English Dictionary - Complete & Unabridged 10th Edition
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synchronous motor

alternating-current electric motor designed to run at a speed that is directly proportional to the frequency of the electric power source. Typically, a synchronous motor has a stator with a winding similar to that of an induction motor. Its rotor produces a constant magnetic field, either from a direct current in its windings or by use of permanent magnets. The rotor's magnetic field tends to align with the rotating field produced by the three-phase alternating currents in the stator. When operated on a fixed frequency supply, a synchronous motor operates at a constant speed, but it usually requires additional rotor windings to allow it to start as an induction motor. Large synchronous motors with power ratings of several megawatts are used in some industrial processes to take advantage of their high efficiency and the ability to control the supply power factor. Small synchronous motors are used in applications in which constant speed is crucial, such as in electric clocks, timers, phonographs, and tape recorders. See also electric motor.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The windings are used with a linear synchronous motor to power and brake the
  train.
The synchronous motor was one of only three made and it is the only one in
  existence today.
The drive consists of a three-speed synchronous motor a nd a, gear train
  providing suitable reduction in speed.
The down button is lowered which starts the synchronous motor which lowers the
  plunger at a constant rate.
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