Simon,
I can't really see how this should work. The motor will get the same current/voltage (in your example 1 A/17 V) if you apply 17 V without a resistor or 40 V with a 23 Ohm resistor in series (due to voltage drop across the resistor).
The torque of the stepper motor depends on the electrical current flowing through the coils. If we do not increase the current, the torque won't increase.
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