A field discharge resistor unit according to an embodiment of the present invention is a device coupled to a rotary shaft of a synchronous motor and connected to a coil wound on a rotor of the synchronous motor, to reduce a magnitude of an electric current flowing through the coil wound on the rotor, and comprises: a hub which has a receiving space therein and is coupled to the rotary shaft of the synchronous motor so that a rotary movement of the hub matches that of the shaft; and at least one conductor disk received in the receiving space of the hub and may function as a resistor when an electric current flows therethrough.

A rotor of a line-start synchronous reluctance motor is provided, which includes: a laminated core comprising multiple laminated core sheets having multiple rotor bar holes formed therein in proximity to the circumference thereof, respectively; end plates fixed to both sides of the laminated core, respectively; rotor bars inserted into the rotor bar holes, respectively; and a rotating shaft coupled to the laminated core to be able to rotate integrally, wherein the core sheets comprise multiple flux barriers and steel plate portions on which the flux barriers are not formed, respectively, and extended ends of the flux barriers may be positioned between the rotor bar holes.

A motor driving method is applied to a motor with a rotor comprising a magnetic reluctance structure. The motor driving method comprises enabling the motor by an asynchronous driving method, controlling the motor by the asynchronous driving method according to a speed regulation command, detecting a rotor speed of the motor and determining whether the rotor speed is larger than a speed threshold, and when the rotor speed is larger than the speed threshold, controlling the motor by a synchronous driving method.

A rotor for a reluctance motor includes a laminate stack having layers. Each layer has a plurality of flux-conducting sections formed in each case by a magnetically conductive rotor lamination and extending transversely to a corresponding q axis. The flux-conducting sections are separated from one another by nonmagnetic flux barrier regions. An electrically conductive and non-ferromagnetic filler material is arranged in a plurality or all of the flux barrier regions of the layers to electrically connect the flux barrier regions of adjacent layers to one another so that cage bars of a rotor cage of the rotor which extend axially parallel or skewed with respect to the axis of rotation are formed by the filler material in the flux barrier regions.

A rotor for a reluctance motor includes a laminate stack having layers. Each layer has a plurality of flux-conducting sections formed in each case by a magnetically conductive rotor lamination and extending transversely to a corresponding q axis. The flux-conducting sections are separated from one another by nonmagnetic flux barrier regions. An electrically conductive and non-ferromagnetic filler material is arranged in a plurality or all of the flux barrier regions of the layers to electrically connect the flux barrier regions of adjacent layers to one another so that cage bars of a rotor cage of the rotor which extend axially parallel or skewed with respect to the axis of rotation are formed by the filler material in the flux barrier regions.

Disclosed is an asynchronous rotating electric machine in which none of the electrical windings is rotating, said machine having a homopolar compound structure. The machine comprises: a rotor including magnetic flux return parts; and a stator formed by a pair of armatures and a magnetic wedge connecting the armatures and providing the magnetic flux in the direction of the axis of rotation, an annular induction coil being supplied with alternating current and housed between the air gap and the wedge, and one or two armature coils being received by one or both of the armatures generating an alternating magnetic flux.

Disclosed is an asynchronous rotating electric machine in which none of the electrical windings is rotating, said machine having a homopolar compound structure. The machine comprises: a rotor including magnetic flux return parts; and a stator formed by a pair of armatures and a magnetic wedge connecting the armatures and providing the magnetic flux in the direction of the axis of rotation, an annular induction coil being supplied with alternating current and housed between the air gap and the wedge, and one or two armature coils being received by one or both of the armatures generating an alternating magnetic flux.

According to an aspect of the disclosure herein, a generator is provided herein. The generator includes a rotor that further includes a plurality of slots. The generator also includes a three-phase winding configured to produce a first magnetic field and an excitation winding. The excitation winding is a material filling in the plurality of slots and produces a second magnetic field. In turn, a rotation of the generator induces alternating voltage in the stator three-phase winding and the stator excitation winding excites the magnetic flux in the rotor.

According to an aspect of the disclosure herein, a generator is provided herein. The generator includes a rotor that further includes a plurality of slots. The generator also includes a three-phase winding configured to produce a first magnetic field and an excitation winding. The excitation winding is a material filling in the plurality of slots and produces a second magnetic field. In turn, a rotation of the generator induces alternating voltage in the stator three-phase winding and the stator excitation winding excites the magnetic flux in the rotor.

A rotor for an interior permanent magnet machine (IPM), comprising a rotor core having a plurality of magnetically conductive laminations stacked in a rotor axial direction. The magnetically conductive laminations comprise cut-out portions forming a plurality of flux barriers (FB) radially alternated by flux paths (FP), at least a first part of the flux barriers (FB) housing permanent magnets, at least a second part of the flux barriers (FB) being filled with an electrically conductive and magnetically non-conductive material creating a cage inside the rotor core. The rotor further includes a first and a second short circuit ring positioned at the opposite ends of the rotor core, the first short circuit ring being different from the second short circuit ring.