Speed electromotive force phase control system adapted to low speed
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 11, 2003
Grant Date -
Oct 11, 2001
app pub date -
Mar 23, 2001
filing date -
Mar 24, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Three-phase/d-q converters convert an output voltage V outputted from a power converter and a coil current flowing through a propulsion coil to a voltage and a current in a dq rotary coordinate system, respectively. A speed electromotive force observer estimates speed electromotive force based on these voltage and current, and a vehicle angular speed .omega., and a speed electromotive force phase generator calculates a speed electromotive force phase .theta.e based on the estimated speed electromotive force Zd, Zq. A phase synchronization controller constituted as a secondary PI control system stabilizes the speed electromotive force phase .theta.e and outputs it as a phase reference .theta.*. Accordingly, it is possible in a system of an LSM vehicle to obtain the stable phase reference .theta.* with a minimum deviation even when the vehicle is running at low speed.
First Claim
Other Claims data not available
