Method and apparatus for improved low current accuracy in...

Details Method and apparatus for improved low current accuracy in... Method and apparatus for improved low current accuracy in...

2005-03-15

2005-03-15

Martin, David (Department: 2837)

Electricity: motive power systems

Open-loop stepping motor control systems

C318S685000

Reexamination Certificate

active

06867566

ABSTRACT:
The sense signal, which is used to indicate that the motor phase current in a stepper motor is at the set point, is marked both before and after each pulse width modulator edge thereby reducing susceptibility to commutation noise from any phase. A mask time is created for a period before and after a PWM edge. The phase current is balanced during this mask time by removing and replacing the phase current.

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