Page 657 - Mechatronics with Experiments

ELECTRIC ACTUATORS: MOTOR AND DRIVE TECHNOLOGY 643
End plate

Housing

Commutator Permanent magnet
(ferrite magnet)
Bearing
Rotor iron core
Brush

FIGURE 8.22: Components of a brush-type DC motor: rotor (typically made of laminated
sheets of steel), stator, commutator, brush pair, housing, end and face plates, two bearings.

end plates in order to provide space for the rotor and housing expansion due to temperature
variations. The rotor is typically made of laminated iron sheet metal and each lamination
is insulated from each other. The laminated rotor has slots which house the windings.
The core surface and windings are electrically insulated from each other by insulation
material, coating on the core, or an insulating thin sheet of paper. The slots may be skewed
on the perimeter in order to reduce the torque ripple at the expense of lower maximum
torque.

Patented anti-cog magnets for Conduit box (gasketed) - large
smooth low speed operaation. High wiring compartment for easy
overcurrent capacity and dynamic termination
braking without demag
Polyester impregnated
armature for electrical and
mechanical integrity
TEFC and TENV
configurations
Class H insulation
Rugged, fused
commutator

Long life, constant force
brush springs with field
replaceable brushes
Large sealed bearings
are standard
Environmentally protected
models - explosion proof and
wash down duty
Permanent magnet fields are
more efficient, smaller lighter and
offer wider speed range than
NEMA or metric mounting comparable wound field motors
FIGURE 8.23: Brush-type iron core armature permanent magnet DC motor assembly
Source: Baldor.