There are two basic types of current collectors
The other type is a pancake type made up with a number of copper segments insulated from each other to form a flat round surface similar to a cdrom where the brushes run on the flat face of the copper segments.
The pancake types are generally used where space is at a premium and you require a motor with a short length such as often used on automobile starter motors.
There are also basically two types of slipring assemblies.
The first consists of a number of rings fitted to a cylinderical insulated body where the brushes run on the o/d of the ring.
The other is a pancake shaped similar to a cdrom where the metal rings are inbedded into the end face of the body and the brushes run on the flat surface of the rings.
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UpDated 20-03-2001