Patent ID: 7777384

Claim:
A permanent magnet (PM) dynamoelectric machine with directly controllable field excitation control comprising: 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 Φ 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 I c to the control coils at least partially magnetically saturates the shunts to reduce shunting of air gap magnetic flux Φ g , thereby increasing magnetic flux linkage Ψ M between the PMs and the stator coils and increasing generated electromagnetic force (EMF) and electromagnetic torque T e to desired levels upon application of electrical power to the stator coils at lower levels of rotor assembly angular velocity.