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Physical Structure & Configuration of DC Machines [Education]
posted March 18 2014 4:29.48 by spic0m




DC motors have been used in industrial applications for years. Coupled with a DC drive, DC motors provide very precise control DC motors can be used with conveyors, elevators, extruders, marine applications, material handling, paper, plastics, rubber, steel, and textile applications to name a few.

Standard DC motors are readily available in one of two main forms:

Wound-field,where the magnetic flux in the motor is controlled by the current flowing in a field or excitation winding, usually located on the stator.
.
Permanent magnet, where the magnetic flux in the motor is created by permanent magnets which have a curved face to create a constant air-gap to the conven-tional armature, located on the rotor. These are commonly used at powers up to approximately 3 kW.

Torque in a DC motor is produced by the product of the magnetic field created by the field winding or magnets and the current flowing in the armature winding. The action of a mechanical commutator switches the armature current from one winding to another to maintain the relative position of the current to the field, thereby producing torque independent of rotor position.

Read whole article here.


[Link: Electrical Engineering Portal]
 
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