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Unformatted text preview: er sleeve, called a
commutator, resides on the axle of a BDC motor. As the
motor turns, carbon brushes slide over the commutator,
coming in contact with different segments of the
commutator. The segments are attached to different
rotor windings, therefore, a dynamic magnetic field is
generated inside the motor when a voltage is applied
across the brushes of the motor. It is important to note
that the brushes and commutator are the parts of a
BDC motor that are most prone to wear because they
are sliding past each other. Shunt-wound Brushed DC (SHWDC) motors have the
field coil in parallel (shunt) with the armature. The
current in the field coil and the armature are independent of one another. As a result, these motors have
excellent speed control. SHWDC motors are typically
used in applications that require five or more horsepower. Loss of magnetism is not an issue in SHWDC
motors so they are generally more robust than PMDC
motors. TYPES OF STEPPING MOTORS
As mentioned earlier, the way the stationary magnetic
field is produced in the stator differentiates the various
types of BDC motors. This section will...
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This note was uploaded on 01/29/2014 for the course AA AA taught by Professor Aa during the Winter '10 term at ENS Cachan.
- Winter '10