A rotor of a synchronous reluctance motor may include: a plurality of laminations forming a stack, each lamination including: two parallel surfaces and a perimeter that define the lamination and a direction of stacking the laminations that is perpendicular to the parallel surfaces, the lamination at least partially filled with a magnetically soft electrical conductor and at least one cavity encircled by the conductor and extending from a first to a second surface of the two parallel surfaces, the conductor forming at least one bridge at the perimeter of the lamination from one side of the at least one cavity to another side of the at least one cavity. A value of a magnetic property and a value of a mechanical property of the at least one bridge differs from a value of the magnetic property and a value of the mechanical property of the conductor material.

A rotor for an electric machine, includes a rotor lamination stack divided into a plurality of sectors, in each of which there is arranged a permanent magnet assembly which comprises two permanent magnets positioned in a V-shape symmetrically with respect to a plane of symmetry dividing the sector into two half-sectors, wherein an outer radius of the rotor lamination stack in a particular sector has a pair of local minimum values, which are formed symmetrically to one another with respect to the plane of symmetry in a half-sector of the sector.

A method of identifying a fault in a synchronous reluctance electric machine, the method including carrying out a first vibration measurement on a stator in a first radial direction of the stator; carrying out a second vibration measurement on the stator in a second radial direction of the stator; determining, on the basis of at least one of the first vibration measurement and the second vibration measurement, a first vibration frequency; determining, on the basis of the first vibration measurement and the second vibration measurement, a mode shape of the vibration at the first vibration frequency; and determining, on the basis that the first vibration frequency f.sub.b and the mode shape m fulfil the following barrier fault conditions:

f.sub.b=f.sub.r, and m=1

where f.sub.r is a rotation frequency of a rotor, that a flux barrier of the rotor is defect.

A rotor including: a drive shaft rotating about an axis of rotation, a plurality of annular rotor plates, identical to each other, mounted on the drive shaft, superposed along the axis of rotation and including a plurality of openings, a pair of closing plates which are located at the ends of said plurality of rotor plates, a plurality of bars, passing through at least part of said plurality of openings of the plurality di rotor plates, a pair of short-circuit rings located a the ends of said plurality of bars and wherein an active ratio between a first area occupied by the plurality of openings and a total area of the rotor plate is greater than or equal to 0.30, that is, R1=A1/AT ≥ 0.30.

A motor includes a rotor including a rotating shaft extending along a center axis, a cylindrical rotor core provided outside the rotating shaft in a radial direction, and two discoid weight plates provided at two ends of the cylindrical rotor core in an axial direction, and a stator opposing the rotor in the radial direction. A radius of each weight plate is smaller than a radius of the rotor core, and a difference between the radius of the rotor core and the radius of each weight plate is larger than an air gap between an outside of the rotor core in the radial direction and an inside of the stator in the radial direction.

A switched reluctance machine comprising at least one rotor comprising a set of rotor poles arranged about a central axis, at least one stator positioned concentric to and radially outward from the central axis and the rotor, the stator having an outer surface and an outer surface active zone; a housing having a sleeve positioned only radially outward from the stator outer surface active zone; at least one housing endplate coupled to an end of said housing; wherein said stator has no direct connection to said housing, and wherein the number of rotor poles R.sub.n and number of stator poles S.sub.n utilizing a numerical relationship defined by a mathematical formula, R.sub.n=2S.sub.n−F.sub.p, when S.sub.n=m×F.sub.p, wherein F.sub.p is the maximum number of independent flux paths in the stator when stator and rotor poles are fully aligned, and m is the number of phases.

An electric motor has a stator defining multiple stator poles with associated electrical windings, and a rotor having multiple rotor poles. The rotor has flux barriers between adjacent rotor poles, the flux barriers each having a material with an electrical conductivity higher than the rotor pole material. The flux barriers are electrically isolated from one another external to the ferromagnetic material. Eddy currents are induced in the flux barrier to cause destructive interference of an impending magnetic field, such that the flux barrier effectively acts to inhibit magnetic flux during motor operation, which in some cases will result in a repulsive force that will act to increase an induced motive force on the rotor poles.

Described is a method for optimizing a synchronous reluctance motor assisted by magnets (1), comprising the arrangement of a stator (2) provided with a number (t) of slots (3), the arrangement of a rotor (4) having an outer cylindrical surface (S.sub.e) of radius (r.sub.e), an inner cylindrical surface (S.sub.I) of radius (r.sub.I), a rotation axis (A) and a number (p) of pole pairs, realisation in the rotor (4) of a number (n) of slots (7) defining flow barriers (Bn) with axial extension for each pole of the motor (1), designed to house magnets (6) and definition of each barrier (B.sub.n) with peripheral profile in the form of a circular segment with convexity facing towards the axis (A) and with concentric radii of curvature (r.sub.nA, r.sub.nB) with common centre (C) arranged along a radial axis (X). The number (n) of barriers (B.sub.n) is greater than or equal to 3, the centre (C) is located outside the surface (Se) and each barrier (Bn) has a constant thickness (bn) along its arcuate extension defined by the difference between the radii (r.sub.nA, r.sub.nB). The thicknesses (b.sub.n) are progressively decreasing from the surface (S.sub.i) to the surface (S.sub.e) with optimal thickness (b.sub.n) of the outer barrier (Bn) equal to b.sub.n=k.sub.n−1b.sub.1, where k.sub.n−1 is a numerical coefficient relative to the n-th barrier (B) corresponding to a substantially constant magnetic permeance across the barriers (B.sub.n) and to a response to a quadrature excitation current with minimum harmonic content.

An electric machine for a vehicle, comprising a stator, and a rotor comprising a plurality of poles, where each pole comprises a first V-shaped flux barrier and a second V-shaped flux barrier, where the first V-shaped flux barrier comprises two magnets with inner air cavities and outer air cavities, where the second V-shaped flux barrier comprises two magnets with inner air cavities and outer air cavities, and where the first and second V-shaped flux barriers are arranged adjacent each other and symmetrically to a d-axis of the rotor, where each of the poles further comprise a first V-shaped flux redirector arranged symmetrically to the d-axis and between the first V-shaped flux barrier and the second V-shaped flux barrier.

A synchronous reluctance motor includes: a rotor shaft; a rotor core fixed to the rotor shaft and on which a plurality of flux barriers are formed; a stator core on which a plurality of protruding stator teeth are formed; and multiphase armature windings of a plurality of poles wound around the plurality of stator teeth. The flux barriers include a plurality of first flux barriers formed to be spaced out in the circumferential direction from each other and extend in a radial direction, and a plurality of second flux barriers formed in each of circumferential angular regions sandwiched between the first flux barriers to form a curved surface convex toward the center of the rotation-axis and to spread and be spaced out in the circumferential direction from each other.