[princeton]

I think theory, the need for the diode can be overcome by large-enough capacitors in parallel with the motor. How large is needed to overcome the inductance is anybody's guess, though.

I think the best approach is a combination of a capacitor and diode in parallel with the motor along with a high-enough controller frequency. I am a bit concerned about having a diode in parallel with the motor without a resistor (in series with the diode). The currents through the diode may reach extremely high levels without a resistor. The problem with using a resistor is that it would limit the voltage dampening effect of the diode. Has anybody had a problem with the diodes burning?