In 1824, the French physicist François Arago formulated the existence of rotating magnetic fields, termed Arago's rotations. … See more

In both induction and synchronous motors, the AC power supplied to the motor's stator creates a magnetic field that rotates in synchronism with the AC oscillations. Whereas a synchronous motor's rotor turns at the sam… See more

The stator of an induction motor consists of poles carrying supply current to induce a magnetic field that penetrates the rotor. To optimize the distribution of the magnetic field, windings are distributed in slots around the … See more

The method of changing the direction of rotation of an induction motor depends on whether it is a three-phase or single-phase machine. A three-phase motor can be reversed by swapping any two of its phase connection… See more

The power factor of induction motors varies with load, typically from about 0.85 or 0.90 at full load to as low as about 0.20 at no-load, due to stator and rotor leakage and magnetizing reactances. Power factor can be improve… See more

Full-load motor efficiency ranges from 85–97%, with losses as follows:
• Friction and windage, 5–15%
• Iron or core losses, 15–25%
• Stator losses, 25–40%… See more