SECTION 3 - BRUSH THEORY AND CHARACTERISTICS
Question 3:4 What Relevance Is Brush Hardness?
Obviously the hardness has to do with the type of materials used in producing the brush grade and how tightly these are compressed into the block prior to baking.
While it is often assumed that a harder brush will give longer life it is not necessarily the case.
Harder brushes can be longer wearing where the spring forces are high and where the commutator and environmental conditions are favorable.
Where the commutator is slightly out of shape or excessive vibration exists then a softer more smooth riding brush may well give longer life becaues the harder brush will skip and bounce and may chip or shatter. On the other hand going too soft is also a problem as the brush will not have the strength to handle the vibration and may crumble or collapse.
Harder brushes while giving the potential for longer life may cause excessive wear on the commutator, therefore a balance between long brush life and the general machine condition must be aimed for.
Question 3:5 What Is Current Density?
The information has been drawn from experience of Morganite Taiwan Limited Application Specialists combined with a wide range of published information from major carbon supplier and motor manufacture. However, the material can not be downloaded, copied or used without written permission.
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