H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/93
H02P 7/28 (2006.01)
Patent
CA 1161494
ABSTRACT OF THE DISCLOSURE A DC motor comprises a stator, a rotor adapted to rotate about an axis with respect to the stator, two coil windings mounted on one of the stator and rotor and separated by an electrical angle of N x 90° where N is an odd integer, a permanent magnet having a plurality of pairs of magnetic pole pieces of opposite polarity mounted on the other of the stator and rotor, a position magnet mounted on one of the stator and rotor for generating a sinusoidal magnetic flux signal, a magnetic reluctance element mounted on the other of the stator and rotor for detecting the sinusoidal magnetic flux signal and generating a control signal proportional to sin2.THETA. in response thereto where .THETA. is an angle corresponding to the rotational position of the rotor, first and second amplifiers for producing drive signals proportional to sin2.THETA. and cos2.THETA., respectively, in response to the control signal, and a switching device for energizing one of the two windings with the drive signal proportional to sin2.THETA. and for energizing the other of the two windings with the drive signal proportional to cos2.THETA. with the direction of current flow through the two windings being periodically alternated in correspondence with the rotational position of the rotor so as to rotate the rotor about its axis.
349466
Gowling Lafleur Henderson Llp
Sony Corporation
LandOfFree
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