ASYNCHRONOUS ELECTRIC MACHINE Russian patent published in 2009 - IPC H02K17/30 H02K17/00 

FIELD: electricity.

SUBSTANCE: present invention relates to electrical engineering and electric machine building, particularly to controlled alternating current electric machines. On the stator and rotor of the asynchronous electric machine there are extra magnetic conductors, made from separate circular packets with alternating current toroid windings between adjacent packets, matching up on the stator bore of the magnetic conductor through a circular air gap. Input terminals are fitted on the toroid windings of the stator. Opposite cylindrical sides of the packets of magnetic conductors are provided with extra closing magnetic conductors. The stator winding of the main magnetic conductor is provided with a block of controlled resistors and controlled direct current source. Between the units of the stator and rotor of the extra magnetic conductor, there is no torque and rotational emf. The frequency of rotation of the rotor has no effect on the electromagnetic field in the circular air gap. Therefore, exchange of electrical energy between windings of the stator and rotor of the extra magnetic conductor takes place through transformer coupling. The torque of the electric machine in the given range of frequency of rotation is controlled by varying resistance of the stator circuit. The machine switches into synchronous mode of operation by supplying direct current to the stator winding of the main magnetic conductor when subsynchronous frequency of rotation is attained.

EFFECT: wider range of regulating frequency of rotation, improved starting characteristics and increased power coefficient of the asynchronous electric machine in nominal conditions.

2 dwg