Shaded pole motor is a split phase type single phase induction motor. The shaded pole motor is very popular for ratings below 0.05 HP (~ 40 W) because of its extremely simple construction.
A shaded pole motor and its schematic diagram are shown in the figures above.
Construction of Shaded Pole Induction Motor
|Parts of a Shaded Pole Induction Motor|
Airgap length between stator and rotor is of the order 0.25 to 0.5 mm. Too short air-gap may result in starting-torque variations due to rotor slotting.
Working of Shaded Pole Induction Motor
- During the portion OA
- During the portion AB
- During the portion BC
Important Characteristics of Shaded Pole Motors
- The salient features of this motor are extremely simple construction and absence of centrifugal switch.
- Since starting torque, efficiency and power factor are very low, these motors are only suitable for low power applications e.g., to drive: (a) small fans (b) toys (c) hair driers (d) desk fans etc.