Shaded pole single phase induction motors. Shaded Pole Induction Motor 2019-07-08

Shaded pole single phase induction motors Rating: 7,6/10 1025 reviews

Shaded Pole Induction Motor

shaded pole single phase induction motors

Due to this overall flux axis shifts to the middle of shaded part. Stator — The stator of the shaded pole motor has a salient pole. Consequently, the flux distribution across the pole is uniform since no current is flowing in shading coil. Due to all these advantages, the single phase motor finds its application in vacuum cleaners, fans, washing machines, centrifugal pumps, blowers, washing machines, etc. This effect is nothing but the rotation of poles from left to right. Rotor — The shaded pole motor uses the squirrel cage rotor.

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What is a Shaded Pole Induction Motor?

shaded pole single phase induction motors

Hence there exists a phase difference between these currents and thereby phase difference between the fluxes produced by these currents. So the shaded ring flux aids the main flux, which leads to the crowding of flux in shaded part of stator and the flux weaken in non shaded part. Nowadays single phase motors are widely used in our house, office and other areas. However, if the rotor is given a initial start by external force in either direction, then motor accelerates to its final speed and keeps running with its rated speed. Now there are two fluxes one is main flux, and another is called rotor flux. Usually 2 to 4 salient poles are used. Since the torque produced by these motors depends upon the phase angle difference, which is almost 90 o.

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How Motors Work For Beginners: (Episode 4) Single Phase Induction and Shaded Pole Motors: 035

shaded pole single phase induction motors

Introduction Shaded pole motor is one of the types of single phase , which are used for producing a rotating stator flux in order to make the single phase induction motor a self starting one. Now let us discuss why the axis shift occurs when current is passed through the winding and how the shading coil aids in producing the shift. How to make single phase induction motor self starting? Since there are space and time displacement between the two fluxes, the rotating magnetic field is produced. The reversal of the direction of rotation, where desired, can be achieved by providing two shading coils, one on each end of every pole, and by open-circuiting one set of shading coils and by short-circuiting the other set. This sequence will repeat for negative cycle too and consequently it produce moving magnetic field for every cycle from non shaded part of the pole to shaded part of the pole. In order to produce rotating magnetic field there must be some phase difference.

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Shaded Pole Induction Motor Working and Application Explained

shaded pole single phase induction motors

They are suitable for small devices like relays and fans. Principle: When a single phase supply is given to the stator of shaded pole induction motor an alternating flux is produced. This is a modified version of split phase motor. It is not wound identical to the main winding but contains fewer turns of much smaller diameter as compared to main winding. The flux produced by this induced emf has no effect on the main flux and hence distribution of flux remains uniform and the magnetic axis lies at the center of the pole. The auxiliary or starting winding carries a series resistance such that its impedance becomes highly resistive in nature. Each component has a magnitude equal to the half of the maximum magnitude of the alternating quantity, and both these components rotate in the opposite direction to each other.

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What is a Shaded Pole Induction Motor?

shaded pole single phase induction motors

This is very cheap in cost, rugged in construction and reliable. These poles are shaded by copper band or ring which is inductive in nature. In this, the auxiliary winding and capacitor remains in circuit permanently and produce an approximate two phase operation at rated load point. The poles are divided into two unequal halves. A portion of each pole is surrounded by a short-circuited turn of a copper strip called shading coil.

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Types of Single Phase Induction Motor

shaded pole single phase induction motors

Regions 1: In this region the rate of rise of flux and hence whenever there is change in flux emf gets induced. Now according to the direction of the current in copper band is such that it opposes its own cause i. The are made self starting by providing an additional flux by some additional means. The resultant of these two fluxes produce rotating magnetic field and hence the starting torque. Since the copper band is short circuit the current starts flowing in the copper band due to this emf induced.

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Shaded Pole Motor

shaded pole single phase induction motors

The change in current induces a current in shading coil. Each of these components will rotate in the opposite direction, with the synchronous speed, N s. Shaded Pole Induction Motor Working When the supply is connected to the windings of the rotor, the alternating flux induces in the core of the rotor. The direction of this field is from non shaded part of the pole to the shaded part of the pole. This type of motor is used to drive the devices which require low starting torque. The copper or aluminum rings permanently short the rotor conductors called the end rings.

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Shaded pole motor diagram and construction explained

shaded pole single phase induction motors

This part where shading coil is placed is generally termed as shaded part of the pole and remaining portion is called as un-shaded part as shown in figure. But one thing remembers that this rotating magnetic field not very strong like a three-phase induction motor. A coil is wounded on it and part of each pole is wrapped by a copper coil. Due to the capacitor, the inrush currents are reduced in this motor. Here the rate of change of current is low, as it has already reached the peak or it is very close to peak value. The current is produced in it such a direction to oppose the main flux.

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Shaded

shaded pole single phase induction motors

. The poles are divided into two unequal halves. It has no starting switch. Why the Shaded Pole Induction Motor designs for low power rating? The distribution of flux through the poles is greatly influenced by the shading coils. So today we are going to know Why Capacitor is used in Single-phase Induction Motor? The flux is distributed uniformly and the magnetic axis lies at the center of pole face.

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