Patent ID: 7102264

Claim:
A synchronous induction motor comprising: a stator equipped with a stator winding; a rotor which is secured to a rotating shaft and which rotates in the stator; a secondary conductor provided around the rotor yoke constituting the rotor; a pair of permanent magnets embedded in the rotor yoke; and permanent magnets for attracting the magnetic field produced by the paired permanent magnets, wherein a magnetic field produced by the permanent magnet substantially does not pass through the rotating shaft, but rather substantially by-passes the rotating shaft and substantially passes through only the rotor yoke; substantially excluding the rotating shaft, the stator is a two-pole stator, the pair of the permanent magnets is disposed, sandwiching the rotating shaft therebetween, with a magnetic pole of one of the pair facing an opposite magnetic pole of the other one of the pair, and the permanent magnets for attracting the magnetic field produced by the paired permanent magnets are disposed at lines of magnetic force which are produced by the paired permanent magnets and which pass around the rotating shaft, so as to have the permanent magnets draw the magnetic field away from the rotating shaft.