Synchronous motor

Uncommon card · No. 142045

A synchronous electric motor is an AC electric motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current. Synchronous motors use permanent magnets or electromagnets for rotors, and electromagnets for stators. The stator creates a magnetic field that rotates in time with the oscillations of the current. The rotor turns in step with the stator field at the same rate and as a result, provides a second synchronized rotating magnet field. Synchronous and induction motors are the most widely used types AC of motors. Synchronous motors rotate at a rate locked to the line frequency since they do not rely on induction to produce the rotor's magnetic field. Induction motors require slip: the rotor must rotate at a frequency slightly slower than the AC alternations in order to induce current in the rotor. Small synchronous motors are used in timing applications such as in synchronous clocks, timers in appliances, tape recorders and precision...

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