Maintenance, Service, and Repair
Motor
Page 3
Commutator
Service limits for the commutator can be found in the
specification tables at the end of this section.
If the commutator is deeply grooved then it should be
cut on a lathe.
Measure the diameter of the commutator. If the diameter
is less than the service limit then the armature or motor
must be replaced.
Measure the commutator segment undercut. If the
undercut is less than the service limit then the insulation
can be cut as shown in the illustration. Grind the hacksaw
blade the match the width of the insulation.
Insulation
Commutator
Incorrect
Hacksaw blade
Correct
Diameter
Armature
Undercut
Brushes
The minimum brush length (service limit) can be found
in the specification tables at the end of this section.
Do not allow the brushes to wear beyond the service
limit. If any one of the brushes lose contact with the
commutator, the commutator will be damaged.
You can use the top of the brush holder to gage the
length of the brush. If the top of the brush is even or
below the top of the brush holder, then the brush is getting
close to the service limit and the brushes should be
replaced. The brushes must be removed to measure
the actual length.
Bearings
The bearings should spin with no noticeable roughness
or grinding and with very little play.
If the bearing free wheels, then the lubrication in the
bearing has been depleted and the bearing should be
replaced.
Any grinding or roughness is an indication that the
bearing is damaged and must be replaced.
Thermal Sensor
Note: The thermal sensor is not available on all
motors.
The thermal sensor is a temperature sensitive resistor
or switch The sensor is buried deep within the phase
windings.
Testing the thermal sensor consists of checking the
resistance.
The tested resistance of the thermal sensor will vary
depending on the temperature of the sensor. In most
cases, failure of the thermal sensor will result in a
significant deviation of the resistance.
The sensor specifications can be found in the
specifications table at the end of this section.
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