Electricity: motive power systems – Constant motor current – load and/or torque control
Patent
1997-09-16
2000-01-11
Ip, Paul
Electricity: motive power systems
Constant motor current, load and/or torque control
318430, 318488, 318434, 36442405, 180 791, H02P 714, B62D 504
Patent
active
060139943
ABSTRACT:
To provide a controller of an electric power-steering system, capable of improving the steering performance by presuming a motor angular speed .omega. in a range in which the angular speed of a motor is small and moreover very accurately presuming the motor angular speed and thereby, completely showing the functions for compensating the inertia of the motor and controlling the astringency of a vehicle. Because the presumed error of a back electromotive force between a model motor and a motor to be actually mounted is proportional to a motor current, a dead zone of a motor angular speed having a width proportional to a motor current is set to the presumed value of the motor angular speed. When the motor current is small, the width of the dead zone also decreases. Therefore, it is possible to presume an angular speed .omega. even in a region where the motor angular speed is small. Moreover, a motor angular speed is presumed by defining impedance models of motor driving systems in an intermittent mode and a continuous mode.
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Chin Kei
Endo Shuji
Itakura Yusuke
Kawada Hideaki
Kobayashi Hideyuki
Ip Paul
NSK Ltd.
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