Appeal No. 1998-1078 Page 4
Application No. 08/442,532
ripple, i.e., point "d" shown in Fig. 3(a), occurs
simultaneously with the output signal, i.e., points "a" and
"b," from the FG pattern.
Claim 1, which is representative for our purposes,
follows:
1. A rotation detecting device for a brushless
motor, comprising:
a stator core on which a coil is wound;
a driving magnetic pole portion opposing said
stator core, the driving magnetic pole portion
including a plurality of magnetic poles, and being
rotated;
an FG magnetized portion rotated together with
said driving magnetic pole portion, the FG
magnetized portion including a plurality of magnetic
poles; and
an FG pattern opposing said FG magnetized
portion, wherein
relative positions of said stator core, said
driving magnet pole portion, said FG magnetized
portion, and said FG pattern in a circumferential
direction are set so that a minimum point of a
torque ripple of said brushless motor always occurs
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