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US 9,673,742 B2Granted
Controlling magnetic flux in an automotive electric machine
AssigneeFord Global Technologies, LLC
InventorsKyle M. Hanson, Edward W. Haran
Life of this patent
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Abstract
A method of compensating for magnetic flux resulting from variance from a first electric machine to a second electric machine. A magnetic flux change for the first machine is calculated as a function of a flux difference between the first machine and the second machine. Operation of the first machine is controlled using the magnetic flux change.
Claims8
A method of controlling an automotive electric machine comprising:
- adjusting operation of the machine based on a magnetic flux change for the machine that is a function of a back electromotive force of the machine compared to a baseline back electromotive force, and adjusting operation of the machine based on multiplying a predetermined d-axis current command by a d-axis current change;
- and
- wherein the d-axis current change (ΔId) is (−Δλm/Ld)(Taper_DeltaId), where Δλm is the magnetic flux change, Ld is a d-axis inductance of the machine, and Taper_DeltaId is 1.0 when a full voltage is applied to the machine and (M_Index−M_Index_Min)/(M_Index_Max−M_Index_Min), when less than a full voltage is applied to the machine, where M_Index is a normalized commanded voltage magnitude, M_Index_Min is a minimum normalized commanded voltage magnitude, and M_Index_Max is a maximum normalized commanded voltage magnitude.
Dependencies are inferred from the claim text.