Other Motors Topics
Miniature Motors
 Figure 13 - Some miniature motors use a coreless motor design, also referred to as ironless core or moving coil. The concept replaces a rotating iron armature wound with copper wire with a light weight copper coil. This coil rotates around a stationary magnet system.
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Size vs. capability
Some motors with diameters of less than 1 in. offer over 100 W. Other motors, such as a 48
Vdc motor, offer speeds to 100,000 rpm.
Not all the miniature motors are rotary devices. Miniature linear step motors are
used in applications that require precise linear positioning. For some of these motors,
resolution ranges from 0.008 to 0.000125 in. per full step.
Slightly different
Several miniature motor manufacturers use motor designs that differ
from larger motors. For example, one design uses a hollow, ironless-core,
rotor design, Figure 13, for low inertia and fast response. The rotor fits over a
stationary magnet system. Only the copper coil moves, unlike larger motors where
the whole coil and magnet system move. Such a design is 38 mm in diameter and
is rated for 100 W.
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