Method and apparatus for independently controlling each...

Details Method and apparatus for independently controlling each... Method and apparatus for independently controlling each...

2005-04-12

2005-04-12

Duda, Rina (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S696000, C318S254100, C318S132000, C318S434000, C318S599000, C318S811000, C363S076000, C363S095000, C363S097000, C363S098000

Reexamination Certificate

active

06879128

ABSTRACT:
The current in each phase of a multi-phase step motor is monitored and the excess phase current above the set point current, as required on a cycle-by-cycle PWM basis, is reduced thereby bringing each phase current down to the set point. The PWM frequency is automatically adjusted to maintain a minimum number of PWM edges within a portion of the current waveform. A maximum charge/discharge time is specified as a percentage of the PWM period. These provide an accurate independent current control within each phase of a multiphase step motor.

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