Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2009-05-20
2011-12-06
Dougherty, Thomas (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400110
Reexamination Certificate
active
08072165
ABSTRACT:
An apparatus for estimating rotor position for brushless motors capable of accurately estimating rotor position even though power source voltage fluctuates is provided. First, the power source voltage is detected, and voltage is supplied only for a certain period of time and a current response is detected. The current detection value is multiplied by the ratio of a reference voltage to the power source voltage detected to correct the current detection value. Specifically, the peak current detection value is corrected upwardly or downwardly in each direction. A voltage supplying direction in which the current detection value is maximized is searched for to estimate the rotor position and a brushless motor is started.
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Japanese Office Action dated Jan. 28, 2010, issued in corresponding Japanese Application No. 2008-134194, with English translation.
Japanese Office Action dated Aug. 30, 2010, issued in corresponding Japanese Application No. 2008-134194, with English translation.
Baba Hiroyasu
Hayashi Yuji
Nagata Kiyoshi
Ootake Masaya
Denso Corporation
Dougherty Thomas
Nippon Soken Inc.
Nixon & Vanderhye PC
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