The induction motor has two main components, the stator and the rotor. The stator carries three separate insulated phase windings which are spaced 120° (electrical) apart and lying in slots cut into
a laminated steel magnetic core. The ends of the stator windings are terminated in the stator terminal box where they are connected to the incoming cable from the three-phase a.c. power supply.
The rotor consists of copper or aluminium conductor bars which are connected together at their ends by short-circuiting rings to form a cage winding. The conductor bars are set in a laminated
steel magnetic core.
When the 3-phase a.c. supply voltages are connected to the three stator phase windings, the resulting phase currents produce a multi-pole magnetic flux. This flux is physically rotated around the
stator core by the switched sequence of the R-Y-B currents at a speed called synchronous speed (ns).
The stator rotating magnetic flux cuts through the rotor conductors to induce an alternating emf into them. Since the rotor conductors are connected together at the ends, the induced emf's set up
rotor currents. The rotor currents also produce a magnetic flux which interacts with the stator rotating flux which produces a torque (T) on the rotor conductor bars.
The direction of the rotor torque causes the rotor to rotate in the same direction as the rotating magnetic field.
a laminated steel magnetic core. The ends of the stator windings are terminated in the stator terminal box where they are connected to the incoming cable from the three-phase a.c. power supply.
The rotor consists of copper or aluminium conductor bars which are connected together at their ends by short-circuiting rings to form a cage winding. The conductor bars are set in a laminated
steel magnetic core.
When the 3-phase a.c. supply voltages are connected to the three stator phase windings, the resulting phase currents produce a multi-pole magnetic flux. This flux is physically rotated around the
stator core by the switched sequence of the R-Y-B currents at a speed called synchronous speed (ns).
The stator rotating magnetic flux cuts through the rotor conductors to induce an alternating emf into them. Since the rotor conductors are connected together at the ends, the induced emf's set up
rotor currents. The rotor currents also produce a magnetic flux which interacts with the stator rotating flux which produces a torque (T) on the rotor conductor bars.
The direction of the rotor torque causes the rotor to rotate in the same direction as the rotating magnetic field.
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