Abstract: A permanent magnet (PM) dynamoelectric machine with directly controllable field excitation control comprises: a drive shaft; a PM rotor assembly with multiple PMs arranged around an outer axial periphery of the rotor assembly; a stator assembly comprising a ferromagnetic stator yoke, multiple ferromagnetic stator teeth mounted to the stator yoke with distal ends proximate the outer axial periphery of the rotor assembly separated by an air gap and multiple stator coils mounted between the stator teeth; multiple saturable ferromagnetic shunts, each shunt coupling adjacent distal ends of the stator teeth to shunt air gap magnetic flux ?g generated by the PMs across the air gap through the distal ends of the stator teeth; and multiple saturation control coils, each saturation control coil wrapped about a saturable region of an associated one of the shunts; wherein application of a control current Ic to the control coils at least partially magnetically saturates the shunts to reduce shunting of air gap magnetic fl

Abstract: A DC electric rotating machine, such as a starter of an automotive vehicle, includes a stator with salient poles having at least four poles distributed uniformly over the circumference of the stator, a rotor disposed inside the stator, a set of brushes adapted for the electric supply of the rotor, and at least two geometrically opposed salient poles. Each pole includes at least one substantially radial slot in a plane parallel to the axis of rotation of the rotor and preferably passes through the axis of the rotor. By minimizing the reaction fields of the armature, utilization of the magnetic material of the parts of the stator is balanced and a harmful armature reaction effect, which increases saturation of the polar parts of the inductor and which leads to reduction in the driving magnetic torque, is mitigated.

Abstract: A motor 1 comprises a stator 2, a rotor 10 mounted for rotation about a rotor axis 50 in the stator 2, a pole 11 of the stator 2, a winding on the stator pole 11, and at least one pair of salient poles 10a-d of the rotor 10. The rotor 10 is magnetised so that said rotor poles 10a-d are oppositely magnetised. The motor 1 further comprises an electrical circuit being provided with control means to produce an alternating magnetic field in the pole 11 of the stator 2 to attract each pole 10a-d of the rotor 10 as it approaches the pole 11 and to repel each pole 10a-d of the rotor 10 as it moves away from the pole 11, said field alternating as many times per revolution of the rotor 10 as there are poles of the rotor 10. Each pole 10a-d of the rotor 10 is magnetised by a permanent magnet 72 carried by said pole 10a-d, wherein the magnet 72 has a magnet axis of magnetisation 80, which magnet axis 80 is inclined with respect to a radial direction 82 of said rotor axis 50.