Rotor position sensing system of brushless motor

Details Rotor position sensing system of brushless motor Rotor position sensing system of brushless motor

2011-06-07

2011-06-07

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400340, C318S254100, C318S268000

Reexamination Certificate

active

07956561

ABSTRACT:
A rotor position detecting circuit includes a first position detecting circuit having a low-pass filter that shapes up phase voltage induced in a phase coil and a first comparator that compares the output voltage of the low-pass filter with a threshold level to form a first rotor position signal, and a second position detecting circuit having a second comparator that compares the phase voltage with a threshold voltage and a control unit that digitally processes the output voltage of the second comparator to form a second rotor position signal. The control unit corrects the first rotor position signal by the second rotor position signal to provide a final rotor position signal when the rotation speed of the brushless DC motor is in a measurable range.

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Office Action mailed on Mar. 10, 2009 issued from the Japanese Patent Office in the corresponding Japanese patent application No. 2007-289855 (and English translation).

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