Appeal No. 1998-0506
Application 08/314,994
DECISION ON APPEAL
This is a decision on appeal under 35 U.S.C. § 134 from
the final rejection of claim 1. Claims 2-4 stand objected
to as depending upon a rejected base claim. Claims 5-13 are
indicated to be allowable over the prior art of record.
We reverse.
BACKGROUND
The invention is directed to a permanent magnet motor
having reduced cogging torque by changing the shape and
arrangement of the magnets relative to the stator slots.
Claim 1 is reproduced below.
1. An improved permanent magnet motor having reduced
cogging torque, the improved permanent magnet motor
comprising:
a rotor rotatable about a central motor axis and
having a plurality of permanent magnet elements
disposed at equally spaced intervals, the magnet
elements providing an angular distribution of the
magnetic polarity about the rotor;
motor windings; and
a stator disposed coaxially with the rotor and
separated from the rotor by a circumferential air
gap and having a number of slots formed therein
for housing the motor windings, the slots facing
the air gap, wherein:
the permanent magnet elements are shaped and
arranged such that the distribution of the
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