Patent ID: 7598649
Filing Date: 2009-10-06
Classification: H02K

Abstract:
1. 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 of outer length generally parallel with said motor axis and a radially inwardly facing inner flux interaction surface of inner length greater than said outer length extending generally parallel with the motor axis, each said 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 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 of height dimension generally parallel with the motor axis corresponding with a said stator core outer length, said outer confronting magnetic surface being 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 of length dimension generally parallel with said motor axis corresponding with a said stator core inner length, said inner confronting magnetic surface being generally coextensive with a said stator inner flux interaction surface and spaced therefrom to define an inner working air gap, said rotor being rotatable about the motor axis; and a field winding assembly comprising winding components located around said core components and extending in electromagnetic flux coupling relationship about said winding region, said winding components being controllably electrically excitable for effecting driven rotation of said rotor about said motor axis.