Patent ID: 8362671
Filing Date: 2013-01-29
Classification: H02K

Abstract:
1. A motor apparatus with a voltage step-up function comprising: a capacitor; a multi-phase inverter including DC ends and AC ends, said DC ends being connected across said capacitor; a multi-phase motor including a rotor having a plurality of magnetic poles and a stator formed with tooth portions radially extending with a pitch equal to 5/6 times or a 7/6 times a pole pitch of said rotor, each of said tooth portions being formed with a brim portion circumferentially extending from both circumferential sides of said tooth portion at one end of said tooth portion on the side facing said rotor, said stator having a stator winding including a plurality of star-connected phase windings each being constituted of electric wires concentratedly wound around said tooth portions, phase ends of said stator winding being connected respectively to said AC ends, the electric wires being wound around the tooth portions such that the electric wires are arranged in a plurality of rows in a circumferential direction of the stator between two of the brim portions adjacent to one another; a DC power supply connected between one of said DC ends and a neutral point of said stator winding; and a control section which controls said multi-phase inverter such that a multiphase AC current containing a DC component flows through said stator winding; wherein a circumferential width of said brim portion is smaller than or equal to 0.75 times a cross-sectional size of said electric wires constituting said stator winding.