PURPOSE: To reliably control a motor by detecting the magnetic flux of a magnet by a Hall IC to inexpensively manufacture the motor.

CONSTITUTION: A winding 2 is formed on a core 1 and a cage-type rotor 3 is provided in a bore side to form a small-sized induction motor. The winding 2 is molded with a resin 4 together with the core 1 to form a stator 5, and brackets 6, 7 are provided at both sides. A substrate 11 is interposed to the stator 5 to attach a Hall IC 12 to one bracket 6, and a magnet 13 is attached to a shaft 10 at a position opposed to the IC. Thus, the IC 12 detects the rotating speed of the rotor 3 to transmit it to a control circuit, which arbitrarily control a voltage applied to the winding 2 to obtain a set rotating speed. Since the IC 12 has therein an amplifier, even if a large noise is mixed-in from the exterior, it is not affected by said noise.