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Shaded pole motors are one of the most popular single-phase induction motor types in fractional horsepower

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Shaded pole motors are one of the most popular single-phase induction motor types in fractional horsepower

Posted by Admin | 30 Jun
Shaded pole motors are one of the most popular single-phase induction motor types in fractional horsepower. They use a squirrel-cage induction rotor with copper bars embedded lengthwise in its surface and connected at the ends.
When the main winding carries an alternating current, it induces EMF in the shaded portion of the pole. This induced EMF circulates inside the copper ring and produces its own flux, which opposes the main stator flux.
Efficiency
Shaded pole motors have a very low electrical efficiency. Their electrical loss is primarily due to the copper windings, which create a magnetic field that opposes the main motor flux. This causes a phase shift that generates current in the shading coil.
To overcome this issue, the motor uses a structure called an iron wedge to isolate the shaded portion of each pole. This allows the copper conductor to bridge the gap and increase the magnetic flux of the unshadowed section.
In addition to improving the motor’s electrical efficiency, this design also reduces the amount of current that is needed to start it. This makes it a highly energy-efficient choice for cooling systems.
Reliability
The shaded pole motor relies on an auxiliary winding that’s made up of a copper ring around a portion of each of the shaded poles to provide the phase shift needed to create a rotating magnetic field. This is the same method used in other single-phase induction motors, but is more simple than other methods like using capacitors and centrifugal switches.
The rotor in a shaded pole motor is cage type and is constructed from laminated steel cylinders with conductive bars embedded lengthwise and connected at the ends. This is a common design in fractional horsepower motors.
The motors have a long life span and are easy to maintain, making them a great choice for applications that require low cost and high reliability. This includes household appliances such as fan heaters, evaporators and dehumidifiers and industrial equipment such as pipeline fans. The motors can also be found in commercial and office equipment like air conditioners, ceiling fans and blowers.
Safety
A shaded pole motor is a single-phase induction motor with an auxiliary winding that’s displaced in magnetic position from the main winding. This winding is called a “shading coil,” and it’s responsible for producing the starting torque.
This motor has a squirrel-cage type rotor and a stator that has projected poles. These poles carry the supply winding, which forms a part of the stator. A copper ring is fitted on the smaller portion of each pole. This ring is known as the shading coil.
The shaded coil is responsible for providing the starting torque needed to turn the rotor. It also helps the motor when the load changes at full rpm. The phase shift in the shading coil can provide sufficient locked rotor current to overcome the load change. These features are what make shaded pole motors ideal for small, low-power applications. The motor can even withstand load-changing currents for long periods without burning out.
Applications
A shaded motor can be used in small appliances, especially those that require a light-duty fan. It can also be found in industrial equipment such as level indicators.
The shaded motor uses a single-phase induction motor with a squirrel-cage rotor to operate. Its stationary part, called the stator, has projected poles that each carry their own exciting coil. A copper ring, known as the shading coil, is fitted on the smaller portion of each pole. This coil is designed to delay the magnetic flux of the shaded portion of the pole.
When AC voltage is fed to the stator, the rate of rise of current in the coils varies depending on which region of the waveform it is in. The shading coil produces a current that opposes the decrease in the main flux and shifts its axis to the shaded portion of the pole. The resulting delay in the magnetic flux is reflected as a current in the copper ring.