Patent ID: 6727627
Filing Date: 2004-04-27
Classification: H02K

Abstract:
A synchronous motor which comprises:a stator including a stator iron core having a winding wound therearound, said stator iron core having an inner cylindrical surface; a rotor including a rotor iron core that is rotatably connected to the inner cylindrical surface of the stator iron core, said rotor including a plurality of conductor bars accommodated within corresponding slots defined in an outer peripheral portion of the rotor iron core, said conductor bars having corresponding opposite ends shortcircuited by shortcircuit rings to form a starter cage conductor, said rotor having a plurality of magnet retaining holes positioned on an inner side of the conductor bars; and a plurality of permanent magnets embedded within the plurality of magnet retaining holes in the rotor and defining rotor magnetic poles, each of the rotor magnetic poles including a pair of the permanent magnets, said permanent magnet pair being arranged to define a center point and opposing end-points thereof a center point and opposing end points; interval wherein the slots in the outer peripheral portion of the rotor iron core are separated by slot intervals, slot intervals adjacent to the opposing end points of each of the rotor magnetic poles being smaller than a slot interval adjacent to the center point of each of the rotor magnetic poles.