Patent ID: 7453179
Filing Date: 2008-11-18
Classification: B62D,H02K,Y10T

Abstract:
1. A DC brushless motor for electrical power steering for outputting the steering torque, controlled by a power conversion apparatus for converting the power obtained from an on-board power source, into polyphase a.c. power and for outputting the power, said DC brushless motor for electrical power steering comprising: a frame; a stator secured on said frame; a rotor arranged opposite to said stator through an air gap; a flange for blocking both ends of the frame in the axial direction; and a sensor for checking the magnetic pole position of the rotor said stator comprising; a stator core; and a polyphase stator coil built in said stator core; said stator core, formed by connecting a plurality of split core pieces, comprising: an annular back core; and a plurality of tee cores projected radially from said back core; wherein a slot is formed on said tee core adjacent to said stator core, and said stator coil is composed of a plurality of unit coils, and is incorporated in said slot; said rotor comprising: a shaft; a rotor core provided on the shaft; and a plurality of magnets fixed onto the surface of the outer periphery of the rotor core; said DC brushless motor for electrical power steering further characterized in that said stator core and stator coil are molded by a molding agent, with the stator coil incorporated in the stator core, said shaft being rotatably supported by a bearing, said bearing being arranged on the flange, one side of said flange being provided with a recess, said recess, as a cylindrical member concentric with the shaft, being located inward of the axial end of the frame and extending to the position opposed to the coil end, and one side of said bearing being arranged on the position of the recess radially opposite to the coil end.