Portable appliance motor control with speed-based current limitation
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United States of America Patent
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May 14, 2019
Grant Date -
Jan 11, 2018
app pub date -
Sep 20, 2017
filing date -
Nov 2, 2010
priority date (Note) -
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Abstract
A method of controlling a portable appliance includes measuring an input current supplied to a motor of the portable appliance and measuring a rotational speed of a shaft of the motor. The method also includes determining a current limit based on the rotational speed of the shaft using a substantially continuous function which relates a domain of rotational speeds to a range of current limits. The method further includes reducing, when the input current exceeds the current limit, the rotational speed of the shaft incrementally along the substantially continuous function until the input current is approximately equal to the current limit.
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