5 Questions
Explain the operation of a synchronous electric motor in relation to the frequency of the supply current.
A synchronous electric motor operates in such a way that the rotation of the shaft is synchronized with the frequency of the supply current. The rotation period is exactly equal to an integral number of AC cycles.
What type of electromagnets are used in the stator of a synchronous motor?
Electromagnets are used in the stator of a synchronous motor to create a magnetic field that rotates in time with the oscillations of the current.
What is the term for a synchronous motor that is supplied with independently excited multiphase AC electromagnets on both the rotor and stator?
A synchronous motor is termed doubly fed if it is supplied with independently excited multiphase AC electromagnets on both the rotor and stator.
How does the rotor of a synchronous motor turn in relation to the stator field?
The rotor of a synchronous motor with permanent magnets or electromagnets turns in step with the stator field at the same rate, providing the second synchronized rotating magnet field.
What is the advantage of synchronous motors over induction motors in terms of rotor magnetic field production?
Synchronous motors do not rely on induction to produce the rotor's magnetic field, rotating at a rate locked to the line frequency. In contrast, induction motors require slip, with the rotor rotating at a frequency slightly slower than the AC alternations to induce current.
Test your knowledge about synchronous electric motors, which utilize AC current to synchronize the rotation of the shaft with the frequency of the supply current. Learn about the use of electromagnets in the stator and the mechanism of the rotor's movement in sync with the stator field.
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