Hi friends, welcome to our new post. Here we will discuss What is a Shaded Pole Motor : Construction, Working & Its Applications A Shaded Pole Motor is a single-phase induction motor used in low-power applications where a simple and cost-effective motor is used. Its name is due to shading coil designs that take a rotating magnetic field in the motor to operate there we will cover different parameters of shaded pole motors and related parameters. So let get started with What is a Shaded Pole Motor:
Shaded Pole Motor Definition
- The shaded pole motor is a type of AC single-phase motor. The shaded pole motor is a small motor having two of four poles, that come with auxiliary winding composed of a copper ring or bar covering a part of every pole for the generation weak magnetic field.
- If a single-phase AC supply is connected with stator winding, and due to shading to poles rotating magnetic field is produced.
- Auxiliary single-turn winding is known as a shading coil.
- Current produced in this winding through the magnetic field generated 2nd electrical phase with a delaying phase of magnetic flux varying for the pole which has features to offer 2 2-phase rotating magnetic field.
- The direction of rotation is due to the unshaded side to the shaded side of the pole. As the phase angle between the shaded and unshaded part is small, the shaded pole motor generated a small starting torque as compared to the torque for full speed.
- Shaded pole motors of asymmetrical type are reversible by disassembly and flipping over stator through some same motors come with small, switch shortly auxiliary windings of thin wire then thick copper bars and can be reverse electrically.
Shaded Pole Motor Construction
A Shaded Pole Motor comes with these main components:
- Stator: it is a static part that has main winding and shading winding. The shading coil is a small copper wrapped over the surface pole.
- Rotor: Rotoeris cylinder shape of iron or aluminum that is configured on the motor shaft.
- End Rings: These are short-circuited rings configured at both rotor ends.
- Main winding: The main winding is the primary winding of the motor. Here power source connected
- Shading coil: it is a single-turn copper ring or bar placed around each pole of the stator. It is attached to the main winding through a capacitor.
- Capacitor: The capacitor is used to delay the current in the shading coil, which results in the magnetic field produced by the shading coil rotating slower than the magnetic field of the main winding.
Advantages of Shaded Pole Induction Motor
- Self-starting:
- Simple design:
- Low cost:
- Rugged and reliable:
- Low maintenance:
Disadvantages of Shaded Pole Induction Motor
- It has a low starting torque
- There is no reverse rotation exists in this motor
- It has a poor starting power factor
- its efficiency is low
What is a shaded-pole motor used for?
In a shaded pole induction motor, the shaded coil generated a weak rotating magnetic field and not at constant magnitude. So they are small rating starting about 20 watts. This motor can used in toys, hair dryers, desk fans, cooling fans, etc.
What is the difference between shaded poles and PSC motors?
PSC comes with the same applications as shaded pol except operates at high efficiency, has lower current, and provides high horsepower features.
What is the speed of a shaded-pole motor?
The shaded pole motor is an induction motor type that uses neat magnetic tricks for the generation 2nd phase. It operated at below synchronous speed and slipped based on torque. For a simple 2-pole motor, we will expect to operate at 90 percent of 3000 rpm or 3600 rpm.