Shaded-pole motors of the asymmetrical type shown are only reversible by disassembly and flipping over the stator, though some similar looking motors have small, switch-shortable auxiliary windings of thin wire instead of thick copper bars and can reverse electrically.
Why can’t you reverse a shaded pole motor?
You can not reverse it as shading coil (usually a thick copper ring) is fitted and fixed in the Stator pole shoe to a corner. Due to Inductance of this coil motor always rotates towards this ring in the periphery of the circle around the gap.
Are shaded pole motors AC or DC?
Shaded Pole Motors
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.
What is the highest HP for a shaded pole motor?
For extremely small capacities up to 1/40 hp (18.7W), the shaded-pole type of motor is most frequently used. It provides sufficient torque for fans, blowers, and other similar equipment, and the starting current is not objectionable on lighting lines.
Does a shaded pole motor have brushes?
The construction of the motor is very simple because it does not contain any commutator, brushes, collector rings, etc. or any other part. The shaded pole induction motor does not have any centrifugal switch.
Is shaded pole motor self-starting?
What is Shaded Pole Motor? Definition: A shaded pole induction motor is a simple single-phase induction motor, which is self-starting with one of the poles shaded by the copper ring. The other name of the copper ring is a shaded ring, where it acts as a secondary winding motor.
How do you test a shaded pole motor?
It’s easy to determine the direction of rotation of a shaded pole motor. The rotor will always turn from the middle of the pole towards the “shaded” portion of the pole. The shaded part of the pole is with the small exposed copper windings. This motor will run clockwise, seen from this side.
How many windings does a shaded pole motor have?
Unlike other types of single phase motors, shaded-pole motors have only one main winding and no start winding or switch.
What is the efficiency of a shaded pole motor?
The efficiency of shaded pole motors generally is only between 15 and 30%. And the power factor is rather low as well. A low power factor and efficiency is probably ok for applications where there is only one small fan (shaded pole motors are generally 40 W or less).
What is the principle of shaded pole induction motor?
The working principle of shaded pole induction motor is simple, the main winding carries alternating current and produces magnetic flux in the stator coil. The same magnetic flux cut by the copper shaded band. Due to this, the EMF will be induced in the copper band.
What is meant by shaded pole motor?
: a single-phase induction motor in small ratings made self-starting by flux displacement derived by means of a permanently short-circuited, high-resistance winding or loop encircling a fraction of the pole pitch or pole piece.
How do you increase the RPM of a shaded pole motor?
For a simple 2 pole motor, you’d expect it to run at perhaps 90% of 3000 rpm (50 Hz countries), or 3600 rpm (60 Hz). This is what you are seeing. If you reduce the voltage, with a series inductor or resistor, the motor will produce less power and depending on the load, the speed will drop and the slip increase.
What type of motor has only one winding?
Single-phase induction motors are not self-starting without an auxiliary stator winding driven by an out of phase current of near 90°. Once started the auxiliary winding is optional. The auxiliary winding of a permanent split capacitor motor has a capacitor in series with it during starting and running.
What is the use of shading coil in the shaded pole motor?
function in shaded-pole motor
winding is known as a shading coil and consists of one or more shorted turns. 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.