As the hours accumulate on your generator the brush assembly wears down, the springs associated with the assembly weaken and the carbon brush contact diminishes, creating heat and ultimately brush assembly failure.
What we observe first is an increase in the rotor resistance, requiring more dc voltage input from the voltage regulator to keep the voltage output levels within the engineered parameters.
This loss of the integrity of the brush assembly can cause voltage regulator failure, requiring replacement of the voltage regulator in order to maintain output voltages.
With additional age, the rotor may require more work or energy from field boost.
Field boost begins the electron movement which is the definition of electricity. Sometimes we have to give some assistance for rotors with higher insulation resistance or for those with loss of their permeability value.
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