System and method for determining position or speed of a...

Data processing: measuring – calibrating – or testing – Measurement system – Speed

Reexamination Certificate

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C318S470000, C702S078000, C702S151000

Reexamination Certificate

active

07668690

ABSTRACT:
A motor control system and method are provided for detecting current ripple in a commutated DC motor and further determining position and speed of the motor based on the detected ripple current. Ripples in the motor current are detected and a ripple frequency is calculated based on the time between successive ripples. A ripple count between successive frequencies is determined and the ripple count is compared to a threshold value, and an estimated ripple frequency is determined from a motor model when the ripple count exceeds the threshold value. A corrected ripple count is calculated from a ratio of the calculated ripple frequency and the estimated ripple frequency, and motor position and motor speed are determined based on the corrected ripple count.

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European Search Report dated Jul. 1, 2009.

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