Saturday, August 10, 2013

Motor Components


An AC electric motor is comprised of the following components:


Frame - The frame is a housing that holds all internal and external motor components.

External Fan - Positioned on the exterior end of the motor assembly, the fan blows air across the outside of the motor to prevent overheating.
Fan Cover – Protects the fan from foreign object damage and protects people from injury.

Cast Rotor – Also know of as the armature. The armature is the assembly of windings. These windings interact with the stator to form the magnetic fields necessary for generating rotation energy.
Stator – Stationary portion of the motor’s electrical field.

Front Bearing – Shaft support that reduces friction rotation. The front bearing is located at the end where the shaft extends from the motor housing.
Rear Bearing - Shaft support that reduces friction rotation. The rear bearing is located at the same end as the external cooling fan.

Base – Also referred to as the foot mount, the base secures the motor housing to the equipment platform.
Shaft – The shaft runs longitudinally through the center of the stator, and is supported by the front and rear bearings.

Capacitor – Affixed to the outside of the motor, the capacitor shifts the phase of the incoming current and feeds the starter winding.
Front End Shield – Located at the end where the shaft extends from the motor, the front end shield encloses the motor frame and supports the front bearing.

Rear End Shield – Located at the same end as the external cooling fan, the rear end shield encloses the motor frame and supports the rear bearing.
Internal Fan – Located within the motor housing, the internal fan circulates air internally
Nameplate – A tag affixed to the motor to designate motor specification parameters.

Connection Box – A box affixed to the motor housing where motor connections are made with the power supply.
End Ring – Located at the end of the rotor assembly, the end rings provide a surface to connect the rotor bars.


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