Appeal No. 1998-0507
Application No. 08/457,701
across the dc bus and the motor has at least one winding and a rotor 6. The motor 5 is
responsive to a control circuit 9 for controlling current flow through a plurality of current
paths (i.e., current is conducted to each phase of the motor-see Abstract, lines 5-6), each
path including at least one coil of the motor winding. Further, a control circuit is
clearly activated to operate the motor. Thus, Morinaga discloses the claimed invention but
for the specifics of a “capacitor across the rectifier input” for controlling the dc voltage on
the output side of the rectifier.
While Gerfast is not directed to a “polyphase” dc motor, so it doesn’t disclose a
“plurality of current paths,” Gerfast does clearly teach artisans to place a current limiting
capacitor at the input side of a rectifier in a circuit for operating a brushless dc motor. See
column 2, line 67-column 3, line 8. Gerfast teaches advantages of operating such a motor
from AC without a transformer, e.g., cost-savings and efficiency. With the suggestion of
such advantages and no suggestion by Gerfast that there would be an impediment to
applying such a current limiting capacitor to polyphase dc motors, it would appear to us
that the artisan viewing both the Morinaga and Gerfast teachings as a whole would have
been led to provide a current limiting capacitor at the input of the rectifier in the polyphase
dc motor of Morinaga in order to provide for the advantages taught by Gerfast in each of
the phases of the dc motor of Morinaga.
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