They are suitable for small devices like relays and fans because of its low cost and easy starting. Used in exhaust fans, hair dryers and also in table fans. Used in air conditioning and refrigeration equipment and cooling fans.
What is the advantage of a shaded-pole motor?
Advantages, Disadvantages and Applications The various advantages of Shaded pole motors includes Very cheap and reliable Easy to construct Extremely rugged in nature Disadvantages includes Low efficiency Low starting torque Since the shading coil is made of copper, the copper loss is high.
What is a shaded-pole motor?
A shaded-pole motor 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. … 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.
What is the working principle of shaded-pole 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.
Why shaded-pole motor is suitable for low power applications?
This motor has very high power induction losses and also has a very low power factor. Starting torque induced in the motor is very low. Due to these reasons, it has poor efficiency. … The poles in this motor are unequally divided into two halves where the smaller portion is shaded portion that carries a copper band.
Which is the application of universal motor?
There are various applications where universal motors are used, such as power drills, wash machines, blowers and kitchen appliances, etc. And they are also used for numerous different purposes where speed control and high qualities of speed are necessary.
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.
Why the synchronous motor is not self-starting?
Above a certain size, synchronous motors are not self-starting motors. This property is due to the inertia of the rotor; it cannot instantly follow the rotation of the magnetic field of the stator. … Once the rotor nears the synchronous speed, the field winding is excited, and the motor pulls into synchronization.
Which motor is used for mixture?
Universal motor: Universal motor is a commutated series-wound motor. It can operate on either AC or DC power and uses an electromagnet as its stator to create its magnetic field. These motors are generally series wound (armature and field winding are in series), and hence produce high starting torque.
What is the principle of universal motor?
Working Principle of Universal Motor:
A universal motor works on either DC or single phase AC supply. When the universal motor is fed with a DC supply, it works as a DC series motor. When current flows in the field winding, it produces a magnetic field. The same current also flows from the armature conductors.
Which motor is used in hand watches?
Mini Stepping Motors used in clocks, watches and electric meters are a kind of mechanical-electrical converters, transforming electrical energy to mechanical energy. Mini motors used in different ways are machined by applying different techniques and materials.