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Unformatted text preview: discuss the
different types of BDC motors and the advantages/
disadvantages of each. Permanent Magnet
Permanent Magnet Brushed DC (PMDC) motors are
the most common BDC motors found in the world.
These motors use permanent magnets to produce the
stator field. PMDC motors are generally used in applications involving fractional horsepower because it is
more cost effective to use permanent magnets than
wound stators. The drawback of PMDC motors is that
the magnets lose their magnetic properties over time.
Some PMDC motors have windings built into them to
prevent this from happening. The performance curve
(voltage vs. speed), is very linear for PMDC motors.
Current draw also varies linearly with torque. These
motors respond to changes in voltage very quickly
because the stator field is always constant. FIGURE 3: SHUNT-WOUND DC
Series-wound Brushed DC (SWDC) motors have the
field coil in series with the armature. These motors are
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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