Electric power steering system for a vehicle
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United States of America Patent
Stats
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Oct 3, 2006
Grant Date -
May 5, 2005
app pub date -
Oct 31, 2003
filing date -
Oct 31, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system for an electric motor. Field Oriented Control, FOC, uses a digital control system, and attempts to maintain the rotating stator magnetic field ninety degrees ahead of the rotor field, in order to maximize torque. However, if a three-phase motor is used, which is very common, large amounts of computation are required, to convert from a three-phase coordinate system to an orthogonal coordinate system. The invention replaces the three-phase motor with a two-phase motor, which has been found to impose certain additional costs, but also provides benefits.
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Family
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