Described is a hybrid permanent magnet and wire wound starter generator system. The system includes a polyphase stator that converts a rotating magnetic field to electrical energy. The system also includes a rotor including a plurality of permanent magnets and a wound rotor section. The plurality of permanent magnets and the wound rotor section each generate a portion of the rotating magnetic field. Further, the system includes a controller that controls a polarity of the wound rotor section by transitioning the wound rotor section between a magnetic flux enhancement mode and a magnetic flux weakening mode.

The purpose of the present invention is to provide an electric generator which allows the magnitude of mutual magnetic action between a rotor and an armature to be self-adjusted in the electric generator against a fluctuation in a motive power or a fluctuation in an electric load, such that the magnitude of an induced electromotive force is controlled to compensate, with voltage variation, for amounts of the fluctuation in the motive power and the fluctuation in the electric load and to induce electricity with a uniform frequency from the electric generator, while stabilizing the prime mover or load devices, and parts optimized for the same. To this end, the present invention has an iron-piece structure in which the rotor and the armature of the electric generator mutually correspond to each other in a concave-convex structure, and the present invention is configured to be able to control the magnitude of the induced electromotive force, as the armature moves in the axial direction in response to a change in the rotation speed, output voltage, or frequency of the electric generator and, thereby, variably controls a mutually corresponding length of the concave-convex structure.

A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core, an axial end part, and a rotor magnet inserted into an insertion hole formed so as to pass through the rotor core. The axial end part has a recessed portion. The rotor magnet includes a first side surface and a second side surface. The first side surface is fixed to a first inner wall surface of the insertion hole. In a cross section perpendicular to the axial direction, a width of the first inner wall surface is larger than a width of the first side surface. The second side surface is fixed to a second inner wall surface of the recessed portion. In the cross section perpendicular to the axial direction, a width of the second inner wall surface is larger than a width of the second side surface.

A system for evaluating an electromagnetic performance of a permanent magnet (PM) motor. Parameters update an electromagnetic analytical (EA) model. Each component of the PM motor is associated with regions, and assumptions of the EA model include a relative permeability of regions associated with a rotor core modeled as finite. Calculate a general solution to a governing equation to each region which include unknown coefficients to be determined. Define a set of boundary and interface (B&I) conditions for two neighboring regions, each B&I condition is defined through a set of Maxwell equations using the two neighboring regions sets of assumptions, geometries of the PM motor and electrical and magnetic properties associated with the two neighboring regions. All the unknown coefficients in the general solutions in all regions are solved with a linear system of equations obtained from the B&I conditions between the regions, to solve for a magnetic vector potential.

An interior permanent magnet machine includes a stator having electromagnetic windings. The machine also includes a rotor that is disposed concentrically with the stator and is disposed about a rotor axis, the rotor comprising a rotor core defined by a first rotor lamination that is arranged to receive a first magnet set according to a first rotor topology and a second magnet set according to a second rotor topology.

A synchronous machine having a hybrid rotor excitation. The synchronous machine includes a rotor having a plurality of permanent magnets and electromagnets embedded within a rotor body. The permanent magnets produces a constant magnet field having a magnetic axis along a direct axis (D-axis). The electromagnets produces a variable magnetic field along a magnetic axis offset from the D-axis, preferable substantially orthogonal to the D-axis. The plurality of permanent magnets are separated from the electromagnets by a rotor air-gap. The plurality of permanent magnets includes inner pairs and outer pairs of permanent magnets nested in a V-shaped configuration. In another embodiment, the outer pairs of permanent magnets are replaced with outer radius electromagnets.

The disclosure relates to a rotor for an electrical machine, having a central rotor axis. The rotor includes a rotor carrier and at least one superconducting permanent magnet carried mechanically by the rotor carrier. The rotor further includes a magnetization device having at least one superconducting coil element which surrounds the superconducting permanent magnet and which is suitable for magnetization of the superconducting permanent magnet. Furthermore, an electrical machine including such a rotor and a method for magnetization of at least one superconducting permanent magnet of such a rotor are disclosed.

Provided is a rotor for a rotating electric machine, which enables suppression of a reduction in output of a rotating electric machine. The rotor for a rotating electric machine includes: a rotor core having winding-portion insertion holes and magnet insertion holes; rotor winding portions inserted into the winding-portion insertion holes; and rotor permanent magnets inserted into the magnet insertion holes, wherein each of the rotor winding portions includes: a non-magnet portion; and a rotor winding provided to the non-magnet portion, wherein each of the non-magnet portions is fixed to the rotor core, and wherein the rotor windings are fixed to the rotor core through intermediation of the non-magnet portions.

Provided is a rotor for a rotating electric machine, which enables suppression of a reduction in output of a rotating electric machine. The rotor for a rotating electric machine includes: a rotor core having winding-portion insertion holes and magnet insertion holes; rotor winding portions inserted into the winding-portion insertion holes; and rotor permanent magnets inserted into the magnet insertion holes, wherein each of the rotor winding portions includes: a non-magnet portion; and a rotor winding provided to the non-magnet portion, wherein each of the non-magnet portions is fixed to the rotor core, and wherein the rotor windings are fixed to the rotor core through intermediation of the non-magnet portions.

An electric machine includes a stator and a rotor energizable by magnetic fields produced by the stator when receiving a stator current to produce relative motion between the rotor and the stator. A controller is configured to send the stator current through the stator at a current angle measured from the closest one of a pole of the rotor, determine a desired operational output of the electric machine, and determine a desired rotor motion corresponding to the desired operational output of the electric machine. The controller is further configured to calculate a vector control modulation applied to the stator that elicits the desired rotor motion, and adjust the current angle of the stator current based on the vector control modulation to cause the rotor to perform the desired rotor motion and achieve the desired operational output of the electric machine.