The rotor of shaded pole induction motors is Squirrel Cage type rotor. This is to obtain an optimum starting torque and for limiting the torque dip during run up.
This shifting flux is like a rotating weak field moving in the direction from unshaded portion to the shaded portion of the pole.Split phase induction motors have low starting current and moderate starting torque. gratis dating sider danmark Vejle So these motors are used in fans, blowers, centrifugal pumps, washing machine, grinder, lathes, air conditioning fans, etc.We already know that single phase induction motor is not self starting because the magnetic field produced is not rotating type.In order to produce rotating magnetic field there must be some phase difference.
Application of shaded pole single phase induction motor
As soon as this torque starts to revolve the rotor, additional torque is produced by single-phase induction-motor action.The motor accelerates to a speed slightly below the synchronous speed and runs as a single-phase induction motor.During the portion OA of the alternating-current cycle [Fig 1], the flux begins to increase and an e.m.f. The resulting current in the shading coil will be in such a direction (Lenz’s law) so as to oppose the change in flux.Thus the flux in the shaded portion of the pole is weakened while that in the unshaded portion is strengthened as shown in figure 2. Absence of centrifugal switch eliminates the possibility of motor failure due to faulty centrifugal switch mechanisms.