Overmodulation of electric motor in power steering system
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United States of America Patent
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Issued Date -
Mar 30, 2006
app pub date -
Sep 30, 2004
filing date -
Sep 30, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A control system for an electric motor, of the type used to deliver mechanical power to a power-steering system in a vehicle. In one form of the invention, at high motor speeds, an inverter is requested to deliver a pseudo-sinusoidal voltage having peak-to-peak value which a vehicle battery cannot attain. Consequently, the pseudo-sinusoidal voltage delivered to the motor is clipped at some value: the tops, and bottoms, of the pseudo-sinusoid peaks are chopped off. This clipping brings current in the phases closed to being in-phase with the voltage.
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