BRUSHLESS MOTOR AND ELECTRIC POWER STEERING SYSTEM

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PROBLEM TO BE SOLVED : To provide a brushless motor hardly affected by saturation of flux density. SOLUTION : The brushless motor includes a rotor and a stator, wherein in the rotor, a permanent magnet 11 of ten poles including rare-earth neodium is provided at a periphery of a rotor yoke 9, and an outside diameter is 45 to 55 mm, while the stator has a stator core 3 with 12 slots in which an outside diameter is 75 to 85 mm, and has magnetomotive force of 700 ampere turns or more at a maximum current. The stator core 3 is constituted so that a teeth width b is 0.14 times or more the outside diameter of the rotor. COPYRIGHT : (C)2008, JPO&INPIT