Method for activating an electric machine
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United States of America Patent
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Feb 21, 2017
Grant Date -
May 21, 2015
app pub date -
Nov 17, 2014
filing date -
Nov 20, 2013
priority date (Note) -
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Abstract
In a method for activating an electric machine having a rotor, a stator winding having multiple phases and a rectifier having multiple half-bridges corresponding to the number of phases, which each have active switching elements, alternating current signals, which are phase-offset to one another by switching the switching elements, are applied to the phases in a first motor operating mode in which the rotor rotates above a limiting speed, and in a second motor operating mode, in which the rotor rotates below the limiting speed, constant direct-current signals are at least partially applied to the phases by switching the switching elements as a function of an instantaneous angle position of the rotor, the direct-current signals being selected in such a way that a current flow does not exceed a predefined maximum current absolute value through any of the phases.
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