Patent ID: 6046567
Filing Date: 2000-04-04
Classification: H02P

Abstract:
A device for driving a stepper motor in response to slew rate commands, the stepper motor having a rotor and having first and second stator windings, the device comprising:an integrator that receives the slew rate commands as an input and outputs a rotor positioning command,first and second current calculators that calculate the magnitude and sign of first and second currents that are to be supplied to the first and second stator windings in response to the rotor positioning command,first and second current generators that supply first and second currents having variable magnitude and sign to the first and second stator windings respectively in response to the outputs of the first and second current calculators,wherein the first and second current calculators and the first and second current generators have update frequencies in excess of any predominant mechanical resonances of a system being driven by the stepper motor.