I was under the impression that pulse width modulation could be used on 5 wire steppers and not just L/R drives.
Also that 5 wire steppers can be run as Bi-Polar by leaving the centre taps unconnected.
Not only that, but 5 wire unipolars can be run in either hi-torque bi-polar mode, centre taps unconnected. Or they can be run in high speed bi-polar mode by using the centre taps and one half of each coil, ignoring the 2 wires of each other coil half. Higher speed is achieved due to lower inductance, but at the cost of torque.
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