Method for providing a digital current fluctuation signal

Details Method for providing a digital current fluctuation signal Method for providing a digital current fluctuation signal

2005-03-01

2005-03-01

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Phase or time of phase change

Synchro or resolver signal

C341S112000, C341S155000

Reexamination Certificate

active

06861966

ABSTRACT:
A method for providing a digital current signal from an analog armature current signal of a motor. The method includes subjecting the analog current signal to an analog-to-digital conversion to produce a first digital current signal having current ripples for each current ripple of the analog current signal. During start-up and run-down motor operation phases, the analog current signal is sampled at a sampling rate which is greater than an expected rate of the current ripples of the analog current signal to produce a second digital current signal having current ripples for each current ripple of the analog current signal during the start-up and run-down motor operation phases. The current ripples of the first and second digital current signals are then compared. The current ripples of the second digital current signal which are in non-conformance with the current ripples of the first digital current signal are evaluated.

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