Electric Motor
MERGE 12-5
Chapter 12
Fig 12-4: Armature inspection and test
Fig 12-5: Brush spring elasticity test Fig 12-6: Bearing inspection
Inspection of the excitation winding
The burnout or charring of the insulating material of the excitation winding means the electric motor is
overheated due to the overloaded or grounded or short circuit coil winding. In case the insulating
material of the excitation winding is charred, please replace the electric motor or the stator enclosure
component.
Motor element
1. Inspect the insulator ④ for crack or other damages (see Fig 12-7).
2. Inspect the brush
○
13 for damage or heavy wear. Replace the brush when necessary.
3. Inspect the brush spring
○
14（see Fig 12-7). Replace the spring of which the color changes（amber
or blue) due to being heated. Replace the spring of which the elasticity is smaller than 16 ounces
(see Fig 12-5).
Commutato
Commutator
core
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