Appeal No. 1998-1797
Application No. 08/609,943
consecutively arranged at equal intervals in slots provided
between stator magnetic poles and spaced from each other by a
spatial angle about the center of the rotor, the angle being
defined in terms of the number of revolutions per second and
the mechanical time constant (in units of seconds) of the
motor.
Independent claim 1 is reproduced as follows:
1. A brushless DC motor with N phases, where N > 2,
having position detectors from which signal outputs are
indicative of the location of magnetic poles of a rotor,
controlling the rotation for a constant speed, comprising:
N position detectors disposed between magnetic poles,
wherein any two adjacent position detectors are spaced from
each other by a spatial angle ºi in radians about a center of
the rotor, (1/n)*(ºi/2B) < KM is established, where i = 1 to
N-1,
0 < ºi < 2B/N, KM is the mechanical time constant of the motor
(sec), and n is the number of revolutions (rps).
The examiner relies on the following references:
Petersen 4,745,345 May 17,
1988
Elsässer et al. (Elsässer) 4,843,500 Jun. 27,
1989
Kordik 5,164,622 Nov. 17,
1992
Claims 1-7 stand rejected under 35 U.S.C. 103. As
evidence of obviousness, the examiner relies on either one of
Petersen or Kordik, in view of the level of skill of the
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