Small flat brushless motor

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PROBLEM TO BE SOLVED : To provide a smooth rotation. SOLUTION : A small and flat brushless vibration motor is provided with a rotor supporting means 4 set on the center of a fixed base 2, a rotor slipping- off prevention yoke 1 operated by the magnet attraction and having the same thickness of the fixed base used for preventing the rotor from being slipped off and formed on a part only on one inner peripheral section of the fixed base 2, a stator 3 with a plurality of electric coils 3 arranged on the fixed base 2 and a flat magnet 11 rotatably supported by the rotor supporting means 4 and fixed on the lower face of a rotor yoke 7 facing the stator 3 through a clearance. The fixed base 2 is a non-magnetic body, while the rotor slipping- off yoke 1 is composed of a rare earth magnetic body, and the flat magnet 11 is formed of a rare eapth magnet, and an unbalancer 8 formed of a magnetic body is disposed on the flat magnet 11 through the rotor yoke 7.