Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2009-05-20
2011-11-08
Dougherty, Thomas (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400110
Reexamination Certificate
active
08054017
ABSTRACT:
An apparatus for estimating rotor position for brushless motors capable of accurately estimating rotor position is provided. The apparatus may be used as a start-up system for brushless motors. The apparatus performs accurate estimation even though power source voltage fluctuates, and is able to provide compact configuration. The apparatus supplies voltage to the coils respectively. In each supplying period, the apparatus counts voltage supply period of time until current value reaches to a current threshold value. Since a coil indicative of rotor stop position is prone to be magnetically saturated. The apparatus estimates the rotor stop position based on the voltage supply periods. Then, the apparatus starts a switching sequence based on the rotor stop position.
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Japanese Office Action dated Jan. 25, 2010, issued in corresponding Japanese Application No. 2008-134193, with English translation.
Japanese Decision of Refusal dated Aug. 2, 2010, issued in corresponding Japanese Application No. 2008-134193, with English translation.
Baba Hiroyasu
Hayashi Yuji
Nagata Kiyoshi
Ootake Masaya
Yamamoto Naoki
Denso Corporation
Dougherty Thomas
Nippon Soken Inc.
Nixon & Vanderhye PC
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