December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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DC Motors
Figure 7.20 shows a cross-section of a DC motor, sometimes referred to as a
permanent magnet DC (PMDC) motor. A DC motor consists of a permanent
magnet stator and a wound rotor. Connection to the rotor windings is made with
brushes, which make contact with a commutator that is affixed to but insulated
from the shaft. When power is applied, the rotor rotates to align its magnetic field
with the stator. Just as the field is aligned, the commutator sections that had been
in contact with the brushes break contact and the adjacent commutator sections
make contact. This causes the polarity of the windings to reverse. The rotor then
tries to align ...
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