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Originally Posted by Rickertsen2
I was looking at the differences between the two CIM motors and started asking some questions. What internally about a PM DC brush motor define its characteristics. What factors determine the maximum speed, torque etc.
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James, this is a great question. I don't know how much motor background you have, essentially knowing how a motor works, but I think there are a few websites out there that will give you a good description of how they work.
Here's one that's pretty good:
How Motors Work at HowStuffWorks.com
Once this is set, it really depends on the motor construction. Here are a few things off the top of my head:
Number of turns on the motor windings.
Thickness of windings (this affects the max current capacity).
Input Voltage (Higher voltage will yield a proportionally higher speed)
Magnet type & strength
Friction of brushes
I'm sure others can add to this discussion.
Matt