Method for the diagnosis of the offset of the resolver of an electric machine
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United States of America Patent
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Nov 21, 2017
Issued Date -
N/A
app pub date -
Aug 11, 2015
filing date -
Aug 11, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A method for the diagnosis of the offset of the resolver of an electric motor, comprising acquiring a predetermined offset of a resolver associated with the electric motor; in a first transient, supplying an excitation current to the phases of the electric motor. As a consequence of the excitation current, a current established on the axis d of minimum reluctance and a current established on an axis q in phase quadrature with respect to the axis of minimum reluctance are determined. The correctness of the offset of the resolver is diagnosed if the current established on the axis d in the first transient is higher than the current established on the axis d in the second or third transient, and if the current established on the axis q in the first transient is lower than the current established on the axis q in the second or third transient.
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