Vertical stator double gas D.C. PM motors

A d.c. motor having a motor axis, comprising:

• a stator core assembly having a number of isotropic core components formed of pressure shaped processed soft ferromagnetic particles which are generally mutually insulatively associated, each said core component being generally disposed in parallel relationship with said motor axis and in spaced apart relationship along a circular locus symmetrically disposed about the motor axis, each core component having a flux interaction region with a radially outwardly facing outer flux interaction surface generally parallel with the motor axis and a radially inwardly facing inner flux interaction surface extending generally parallel with the motor axis, each core component having a winding region extending in generally parallel relationship with the motor axis a field winding length from said flux interaction region to a backiron region interconnecting the core components in magnetic field exchange relationship;
• a rotor, rotatable about the motor axis, having an outer sequence of a number of generally arcuate outer radial boundary defined regions of magnetization of alternating polarity with an outer confronting magnetic surface generally coextensive with a said stator core outer flux interaction surface and spaced therefrom to define an outer working air gap, said rotor having an inner sequence of a number of generally arcuate inner radial boundary defined regions of magnetization of alternating polarity with an inner confronting magnetic surface generally coextensive with a said stator core inner flux interaction surface and spaced therefrom to define an inner working air gap, the radially adjacent corresponding outer radial boundary defined regions of magnetization and inner radial boundary defined regions of magnetization generally exhibit a common magnetic polarity, and each inner radial boundary being radially angularly offset from the corresponding outer radial boundary an amount effective to promote a mutual cancellation of detent torque at said outer working gap with detent torque at said inner working gap;
• a field winding assembly comprising winding components located around said core components and extending in electromagnetic flux coupling relationship about said winding region;
• a control circuit coupled with said field winding assembly and configured to effect the commutation angle based phase sequence excitation of said winding components to rotate the rotor about the motor axis;
• and
• a control circuit effects said excitation of said winding components at commutation angles corresponding with the radial angular offset of corresponding inner and outer radial boundaries defining magnetic regions.

A d.c. motor having a motor axis, comprising:

• a stator core assembly having a number of isotropic core components formed of pressure shaped processed soft ferromagnetic particles which are generally mutually insulatively associated, each said core component being generally disposed in parallel relationship with said motor axis and in spaced apart relationship along a circular locus symmetrically disposed about the motor axis, each core component having a flux interaction region with a radially outwardly facing outer flux interaction surface generally parallel with the motor axis and a radially inwardly facing inner flux interaction surface extending generally parallel with the motor axis, each core component having a winding region extending in generally parallel relationship with the motor axis a field winding length from said flux interaction region to a backiron region interconnecting the core components in magnetic field exchange relationship;
• a rotor, rotatable about the motor axis, having an outer sequence of a number of generally arcuate outer radial boundary defined regions of magnetization of alternating polarity with an outer confronting magnetic surface generally coextensive with a said stator core outer flux interaction surface and spaced therefrom to define an outer working air gap, said rotor having an inner sequence of a number of generally arcuate inner radial boundary defined regions of magnetization of alternating polarity with an inner confronting magnetic surface generally coextensive with a said stator core inner flux interaction surface and spaced therefrom to define an inner working air gap, the radially adjacent corresponding outer radial boundary defined regions of magnetization and inner radial boundary defined regions of magnetization generally exhibit a common magnetic polarity, and each inner radial boundary being radially angularly offset from the corresponding outer radial boundary an amount effective to promote a mutual cancellation of detent torque at said outer working gap with detent torque at said inner working gap;
• a field winding assembly comprising winding components located around said core components and extending in electromagnetic flux coupling relationship about said winding region;
• a control circuit coupled with said field winding assembly and configured to effect the commutation angle based phase sequence excitation of said winding components to rotate the rotor about the motor axis;
• said field winding assembly is a three-phase configuration;
• said number of core components is eighteen;
• said number of each rotor inner and outer radial boundary defined regions is twelve;
• and
• the angular radial boundary offset is 5°.