Method for measuring the rotational speed of an EC motor
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United States of America Patent
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Apr 13, 2010
Grant Date -
Nov 17, 2005
app pub date -
Apr 28, 2005
filing date -
May 15, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A method for measuring the rotational speed of an EC motor having a primary part including a winding, and a secondary part having magnet segments offset with respect to one another in the circumferential direction and magnetized in alternatingly opposite directions, the magnet segments having tolerances regarding their positioning and/or their dimensions, the method including rotating the secondary part with respect to the primary part and detecting the position of the magnet segments with respect to the primary part. The position measuring signal is differentiated to form a rotational speed signal. At least one correction value is determined and saved to compensate the influence of at least one of the tolerances on the speed signal. The speed signal is corrected with the aid of the correction value.
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