Control method and control apparatus for electric power pump typ

Details Control method and control apparatus for electric power pump typ Control method and control apparatus for electric power pump typ

1997-09-03

1999-12-28

Nappi, Robert E.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02K 2300

Patent

active

060086009

ABSTRACT:
A method is provided for controlling an electric power pump type power steering system. In this method, there are provided a brushless motor (1) rotating, when a current is fed to coils, for driving a hydraulic pump of an automotive vehicle, thereby obtaining an assist power; a plurality of upper transistors (Q1) connected to the coils of the brushless motor with a control voltage being higher than a drive voltage of the brushless motor; a plurality of lower transistors (Q2) connected to a connection point between the coils of the brushless motor and the plurality of transistors and connected to each other; a controller (6) for selectively turning on one transistor out of the plurality of upper transistors in order and repeating an operation of selectively turning on one transistor other than the transistor connected to the upper transistor which has been turned on, out of the plurality of the lower transistors, thereby feeding the current to the coils for respective phases of the brushless motor; and a capacitor (C1), connected at one terminal to a power source and at the other terminal to each connection point between the upper and lower transistors and the coils, for accumulating a drive energy therein. When the upper transistor is turned off, the other terminal of the capacitor is set at a ground potential so that the drive energy of the upper transistor is accumulated in the capacitor.

REFERENCES:
patent: 4435673 (1984-03-01), Hagino et al.

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