Current magnitude variation correction for open loop stepper motor driver circuit

In a device including a microprocessor and a programmable motor controller which conducts an open loop control of power from a power supply to a stepper motor, a method for open loop control of power from the power supply to the stepper motor, the method comprising steps conducted in the microprocessor of:

• checking the voltage supplied to the stepper motor by the power supply under load conditions;
• determining whether the voltage checked in said step of checking is realistic, then
• if the voltage is unrealistic, repeating said steps of checking and determining until a realistic value is reached or said steps of checking and determining are repeated a predetermined number of times,
• if said voltage is unrealistic after said steps of checking and determining are repeated a predetermined number of times, restoring a set of default motor driving parameters to be used by the programmable motor controller,
• if the voltage is realistic, calculating a new set of motor driving parameters based upon the voltage and setting the new set of motor driving parameters to be used by the programmable motor controller.