Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2007-04-11
2011-12-20
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400010, C318S700000, C318S807000, C318S808000, C318S825000
Reexamination Certificate
active
08080957
ABSTRACT:
An object of the present invention is to provide a motor control device capable of suppressing voltage composite vector fluctuation to increase the output of a brushless motor, and a motor-driven power steering system using this device. The present control device calculates motor phase current command values based on a target current and a rotor rotational position detection value, calculates voltage command values based on the motor phase current command values and phase current detection values, and supplies phase currents to a three-phase brushless motor based on the voltage command values. The present control device outputs the phase current command values so that the absolute value of a composite vector of respective phase drive voltages is substantially a value √3/2 times the power supply voltage.
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International Search Report dated Jul. 17, 2007 (two (2) pages).
Form PCT/IB/338 (one (1) page); Form PCT/IB/373 (one (1) page) and Form PCT/ISA/237 (four (4) pages) totaling (six (6) pages), 2007.
Imamura Yousuke
Kovudhikulrungsri Lilit
Maeda Masahiro
Miura Tomohiro
Benson Walter
Crowell & Moring LLP
Luo David
NSK Ltd.
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