Optimized air core armature

An air core motor-generator for converting between electrical energy and rotational energy comprising:

• a rotor that is journalled to rotate about an axis of rotation and a stator that is stationary and magnetically applies torque to said rotor;
• said rotor comprising magnetic poles that drive magnetic flux across an armature airgap;
• said stator comprising an air core armature located in said armature airgap and comprising windings such that AC voltage is induced in said windings as said rotor rotates;
• the circumferential width of a section of said air core armature comprising one set of active lengths of each phase is substantially greater than the circumferential pole pitch and the circumferential width of the active length portion of a single phase is less than the circumferential pole pitch.

An air core motor-generator for converting between electrical energy and rotational energy comprising:

• a rotor that is journalled to rotate about an axis of rotation and a stator that is stationary and magnetically applies torque to said rotor;
• said rotor comprising magnetic poles that drive magnetic flux across an armature airgap;
• said stator comprising an air core armature located in said armature airgap and comprising windings such that AC voltage is induced in said windings as said rotor rotates;
• said windings comprising active lengths that are located in said armature airgap, receive said magnetic flux and induce said AC voltage and end turn portions that traverse circumferentially and connect together said active lengths;
• said air core armature having a two sides that are perpendicular to said magnetic flux and having a first winding layer that is closest to one side and a second winding layer that is closest to the second side;
• active lengths of one phase winding lie only in said first winding layer, active lengths of a second phase winding lie only in said second winding layer and active lengths of a third phase winding lie in more than one winding layer.