Electric motor operation apparatus and method
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United States of America Patent
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Aug 19, 2014
Grant Date -
Apr 12, 2012
app pub date -
Oct 21, 2009
filing date -
Oct 23, 2008
priority date (Note) -
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Abstract
A method for operating an electric motor with primary and secondary sections, wherein the primary section has a multi-phase exciter winding, each of the phase connections of said exciter winding being connected to an output connection of an end stage, which has controllable semi-conductor switches for applying phase voltages to the output connections, includes the following steps: a) introducing an operating phase by applying the phase voltages to the output connections such that a moving magnetic field is induced in the exciter winding, the moving field effecting a relative motion between the primary and secondary sections, b) hinting off the phase voltage at least one of the output connections to introduce a measurement phase, and c) measuring the electrical back emf induced in the winding strand in order to determine the angular difference between the phase position of the exciter current and that of the back emf.
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