Mell What is a shaded pole motor used for?
The various applications of the shaded poles motor are as follows: They are suitable for small devices like relays and fans because of their low cost and easy starting. Used in exhaust fans, hairdryers, and also table fans. Used in air conditioning and refrigeration equipment and cooling fans.
What is the capacity of a shaded pole motor?
They are built in power sizes up to about 1⁄4 horsepower (190 W) output. Above 1⁄3 horsepower (250 W), they are not common, and for larger motors, other designs offer better characteristics. A main disadvantage is their low efficiency of around 26 %.
Is shaded pole motor is self starting?
Shaded pole motor is a self-starting motor because it is a small squirrel-cage motor in which the auxiliary winding is composed of a copper ring or bar surrounding a portion of each pole. This auxiliary single-turn winding is called a shading coil.
What is the function of centrifugal switch in single-phase motor?
7.7 What is the function of a centrifugal switch used on a single-phase motor? After the starting phase of the single-phase motor, the centrifugal switch switches off the starting capacitor or double capacitor.
What is the working principle of a shaded pole motor?
Working Principle of Shaded Pole Motor When power is supplied to the stator, flux is induced in the main part of the pole. This flux induces a voltage in the shading coil. This acts as a secondary winding.
What are the disadvantages of a shaded pole induction motor?
Shaded Pole Induction Motor Disadvantages 1 Starting torque is very low. 2 Power factor is low. 3 Losses in Shaded Pole Induction Motor are high. 4 Hence, efficiency is very low. 5 The speed reversal is also difficult and expensive as it requires another set of copper rings.
How does the shading coil in an AC motor work?
This shading-coil (ring) arrangement displaces the axis of the shaded poles from the axis of the main poles. When power is applied to the stator, the flux in the main part of the pole induces a voltage in the shading coil, which acts as a transformer secondary winding.
How does a shading coil affect a pole?
The effect of the shading coil is to cause the field flux to shift across the pole face from the unshaded to the shaded portion. This shifting flux is like a rotating weak field moving in the direction from the unshaded portion to the shaded portion of the pole.