John Dammeyer wrote:

> 1.  The L method.  This is where the coil voltage and internal
> resistance of the stepper motor winding match the applied voltage.

> 2.  The LR method.  Very popular and again very simple but also has some
> drawbacks.

> 3. The Chopper method.  This is similar to the LR method but uses a
> transistor to apply the high voltage drive to the coil.


4. The Linear constant current method. :o)
Like the chopper CC method but uses a high power
linear amp to force a perfect DC current through
each motor coil. Of the 4 systems provides the
highest *motor* performance at the cost of much
more heat wasted in the driver. Usually considered
old-fashioned and ignored as an option, but is
often cheap and easy to build with discrete parts
and gives great performance for hobby setups etc.
;o)
-Roman

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