What is a shaded pole single phase motor?

A Shaded Pole motor is an AC single phase induction motor. The auxiliary winding, which is composed of a copper ring, is called a shading coil. The current in this coil delay the phase of magnetic flux in that part of the pole in order to provide a rotating magnetic field.

What is meant by shaded pole?

Filters. A magnetic pole in an electric motor or solenoid with a shading coil that encircles a portion of the pole face. The shading coil creates an out-of-phase current that allows a single phase alternating current electric motor to start or minimizes chatter in an alternating current solenoid or relay.

What is the advantage of a shaded-pole motor?

The shaded pole induction motor produces a very small starting torque about 50\% of full load torque. The efficiency of the shaded pole motor is low because of continuous power loss in the shading coil. It is suitable for small devices which require low starting torque.

What is the shaded pole starting Method 1 point?

Explanation: The shaded pole starting method is that the part of the pole is shaded by short circuited copper ring. The displacement between shaded and unshaded portion varies between 200-300. 9.

How does a shaded pole motor fail?

I have generally found it to be the (Oilite) bearings wear, they may overheat and develop a intercoil short over which affect the running efficiency. The windings are sufficiently high an inductance that they rarely blow a fuse when seized.

What is the purpose of shading coil in shaded pole motor?

function in shaded-pole motor The shading coil delays the establishment of magnetic flux in the region that it encircles and thus produces a small component of rotating field at standstill.

What is the function of shading band?

The copper ring used in a shaded-pole motor to produce a rotating magnetic field for starting purposes, or used around a part of the core of an alternating-current relay to prevent contact chatter. Also known as shading coil.

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 are single phase motors used for?

Uses: Single-phase motors are used in equipment and machines that are smaller in size and require lower horsepower (for example, one horsepower). This include equipment such as pumps, refrigerators, fans, compressors, and portable drills.

How many windings does a shaded pole motor have?

one winding
The common, asymmetrical form of these motors (pictured) has only one winding, with no capacitor or starting windings/starting switch, making them economical and reliable. Larger and more modern types may have multiple physical windings, though electrically only one, and a capacitor may be used.

How is a shaded pole motor reversed?

Most of them are constructed so we can reverse the rotation by reversing the field. It is fairly easy to take these apart to turn over the stator which reverses the field so the motor will run in the opposite direction. The position of shading poles determines the direction of rotation of the rotor.

What is a shaded pole motor?

The shaded pole motor is very popular for ratings below 0.05 HP (~ 40 W) because of its extremely simple construction. This motor is self-starting with one of the poles shaded by the copper ring. This simple, maintenance-free, and low-cost motor is generally being used in a wide variety of small power applications.

What is the difference between main pole and shading pole?

The poles in the stator are unequally divided into two halves where the smaller portion is the shaded portion that carries a copper band. A copper ring that is also known as a shading coil is fitted on the smaller part. The shading coil fitted on the main pole is called the shading pole.

What is the direction of rotation of a shaded pole?

The direction of rotation is from the unshaded side to the shaded (ring) side of the pole. Since the phase angle between the shaded and unshaded sections is small, shaded-pole motors produce only a small starting torque relative to torque at full speed.

Why do shaded pole induction motors have low power ratings?

The power losses are very high in the shaded pole induction motor. And the power factor of the motor is low. The starting torque induces in the induction motor are also very low. Because of the following reasons the motor has poor efficiency. Thus, their designs are kept small, and the motor has low power ratings.