Method to prevent midrange resonance during operation of a...

Details Method to prevent midrange resonance during operation of a... Method to prevent midrange resonance during operation of a...

2006-12-26

2006-12-26

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Open-loop stepping motor control systems

C318S685000, C318S701000

Reexamination Certificate

active

07154245

ABSTRACT:
The frequency of the pulse width modulator within a step motor control circuit is increased above a base frequency under defined conditions to enable more accurate construction of the phase current waveform for preventing mid-range resonance. The PWM frequency is stepped between frequencies by a fixed amount above the base frequency, to prevent the excitation of system harmonics and prevent step motor operational instability.

REFERENCES:
patent: 4339701 (1982-07-01), Pritchard
patent: 5779450 (1998-07-01), Fujiwara et al.
patent: 6208107 (2001-03-01), Maske et al.
patent: 6903531 (2005-06-01), Suomi et al.
The American Heratige Dictionary of the English Language, Fourth edition Copyright 2000 by Houghton Mifflin Company Published by Houghtin Mifflin company.

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