DC Motor

A DC motor comprising:

• a stator;
• a rotor adapted to rotate about an axis with respect to said stator;
• at least two windings included in one of said stator and rotor, each said winding including at least one coil;
• flux generating means included in the other of said stator and rotor and including at least one pair of permanent magnet poles of opposite polarity;
• means for for producing drive signals proportional to sin.sup.2 .theta. and cos.sup.2 .theta., respectively, where .theta. is an angle corresponding to the rotational position of said rotor, said means for producing drive signals including position magnet means mounted on one of said stator and rotor for generating a magnetic flux corresponding to the rotational position of said rotor relative to said stator, magnetic reluctance means mounted on the other of said stator and rotor for producing a control signal proportional to sin.sup.2 .theta. in response to said generated magnetic flux, first amplifier means including a first amplifier for producing said drive signal proportional to sin.sup.2 .theta. in response to said control signal, and second amplifier means including means for producing a reference signal, means for inverting said control signal and a second amplifier for producing said drive signal proportional to cos.sup.2 .theta. in response to said inverted control signal and said reference signal;
• and
• means for energizing said at least two windings in response to said drive signals with the direction of current through said at least two windings being alternated in correspondence with the rotational position of said rotor so as to rotate said rotor about said axis.