Patent ID: 6441530
Filing Date: 2002-08-27
Classification: H02K

Abstract:
A d.c. motor exhibiting a predetermined torque constant, field winding resistance, functioning air gap radius extending from a motor axis, and operable to a predetermined maximum current, comprising:a rotor having a sequence of generally arcuate regions of predetermined magnetization and a confronting magnetic surface of principal dimension in parallel with said motor axis, said confronting magnetic surface being located in correspondence with said air gap radius and rotatable about said motor axis; a stator core assembly having a select number of spaced core components formed of pressure shaped processed ferromagnetic particles which are generally mutually insulatively associated, each said core component being disposed about a radius extending from said motor axis, having a flux interaction surface located adjacent said rotor confronting magnetic surface defining a functioning air gap and having a face length parallel with said motor axis and a face width selected to provide a magnetic field coupling corresponding with a field turn derived said predetermined torque constant and said field winding resistance, each said core component having a winding support region spaced from and in flux transfer communication with said flux interaction surface, having a winding region width generally normal to said radius and cross-sectional area attributes effective for conveyance of confronting magnetic flux without saturation when said motor is operated to said maximum current, and said stator assembly including a back iron assembly formed of pressure shaped processed ferromagnetic particles which are generally mutually insulatively associated, said back iron assembly being in flux transfer association with each said core component adjacent said winding support region and having cross-sectional area attributes effective for magnetic flux conveyance without saturation, said face width having a value less than about 2.5 times said winding region width; and a field winding assembly configured to exhibit said predetermined field winding resistance with said field turns, including winding components located at each said core component and extending in electromagnetic flux coupling relationship about said winding support region, said winding components being controllably electrically excitable for effecting driven rotation of said rotor about said motor axis.