Patent ID: 7253543

Claim:
An electric blower comprising: a rotor having a multi-slot rotor winding along which an excitation electric current is supplied through a slip ring by a power supply brush; a stator having a detecting means for detecting the position of a magnetic pole of the rotor, and a stator winding in a pole-focused winding pattern, the stator having magnetic poles such that a distance between a first magnetic end section and the rotor is shorter than a second magnetic pole, the stator having two stator poles and a single phase stator winding, and the rotor winding alone is excited for a predetermined time and then the stator winding is controlled; a centrifugal fan attached to a rotational axis of the rotor; and a casing housing the stator and having a path for wind, whereby in response to the rotor pole position detection signal detected by the detecting means, a semiconductor switch regulates and controls the electric current through the rotor winding or the stator winding.