Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 25, 2007
Patent Application Number
11347543
Date Filed
February 3, 2006
Patent Primary Examiner
Patent abstract
In a motor having a number of poles that have nominally equiangularly-spaced positions that in fact deviate from those positions, the actual pole positions are determined by measuring the periods between zero-crossings of the back-EMF generated during pole-pair interactions. The ratios of the various pole periods can then be computed, and the motor drive current can be adjusted for each pole by applying the respective ratio to a base current value determined from the desired motor speed.
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