Abstract: An electric machine including a rotor shaft having an inner shaft core with a first composition and an outer shaft portion surrounding at least some of the inner shaft core. The outer shaft portion is fabricated from a material having a different composition than the inner shaft core. For example, the inner shaft core could be fabricated from a material having high thermal conductivity, such as copper, while the outer shaft portion is fabricated from a material with lesser thermal conductivity, but greater strength, for example steel. The two-material shaft with a highly thermally conductive core serves to conduct heat from the interior of the electric machine to the housing, or to an exterior apparatus or structure.

Abstract: An electric machine rotor including a shaft, a rotor back assembly surrounding a portion of the shaft, and a plurality of permanent magnets distributed at equal radial distance from the shaft around the rotor back assembly. The electric machine rotor also includes a gap between two adjacent permanent magnets and a thermally conductive material filing the gap. The thermally conductive material is in contact with the rotor back assembly between the two adjacent permanent magnets. The electric machine rotor also includes a heat transfer structure in thermal communication with the thermally conductive material, extending beyond an outer surface of the thermally conductive material to transfer heat away from the electric machine rotor.

Abstract: A rotary electric machine including a stator and a rotor. The stator includes a stator core and an armature winding. The rotor includes a rotor core and a plurality of permanent magnets. The rotor core is disposed on the periphery of a shaft such that a magnetic gap is formed between the rotor core and the stator. The plurality of permanent magnets project in a rotary axis direction from an end face of the rotor core. The rotary electric machine further includes a plurality of magnet holding portions provided respectively on parts of the plurality of permanent magnets that project from the end face of the rotor core. Spaces are provided between the plurality of magnet holding portions.

Abstract: A core lamination includes a first region defined by a ferromagnetic electrical steel substrate having a predefined magnetic permeability and a second region having a lower magnetic permeability than the first region, the second region defined by the substrate selectively overcoated with at least one non-ferrous element from Period 2-5, or a combination thereof.

Abstract: A rotor for an electric motor. A rotor for an electric motor has a main rotor body which includes radial support surfaces. In addition, the rotor has permanent magnet bodies which are arranged radially externally on the radial support surfaces. Associated with each permanent magnet body is a sheet metal holder which at least partially covers the respective permanent magnet body on the side thereof remote from the support surface and which is designed and arranged such that it secures this permanent magnet body in the radial direction.

Abstract: In a multi-gap electric rotating machine, a stator core has a radially outer portion, a radially inner portion and a connecting portion. The radially outer portion is located radially outside of a rotor core with a radially outer magnetic gap formed therebetween. The radially inner portion is located radially inside of the rotor core with a radially inner magnetic gap formed therebetween. The connecting portion radially extends to connect the radially outer and inner portions and is located on one axial side of the rotor core with an axial magnetic gap formed therebetween. A stator coil is formed of electric wires mounted on the stator core. Each of the electric wires has radially-outer in-slot portions, radially-inner in-slot portions and radially-intermediate in-slot portions, which are respectively received in slots of the radially outer portion, slots of the radially inner portion and slots of the connecting portion of the stator core.

Abstract: A rotor of an interior permanent magnet motor includes a rotor core; permanent magnet insertion holes formed in an outer circumferential portion of the rotor core along a circumferential direction; a permanent-magnet end-portion air gap formed in each of both end portions of each permanent magnet insertion hole; a permanent magnet inserted in each permanent magnet insertion hole; and slits formed in an outer circumferential core portion on an outer side in a radial direction with respect to each permanent magnet insertion hole, wherein a width of a core present between the permanent-magnet end-portion air gap and the slit and a width of a core present between the slits are such that a width of a core gradually increases as the core is closer to a magnet pole center from the interpolar line.

Abstract: The invention relates to a brushless direct-current motor (1), comprising a stator (2), a rotor cup (30) that revolves around the stator (2) and has a plurality of permanent-magnet poles (N, S), and a detent torque plate (4) that is connected to the stator (2) and has several pole shoes (41) for generating a detent torque that brings the revolving rotor cup (30) into a detent position. The pole shoes (41) are each arranged in the detent position between two adjacent poles (N, S) of the revolving rotor cup (30) to form a magnetic short circuit. The detent torque plate (4) is arranged substantially outside of the magnetic rotating field produced by the stator (2) during operation, whereby the production of the detet torque is decoupled from the electrical behavior of the brushless direct-current motor (1) and the power of the brushless direct-current motor (1) is not substantially influenced by the presence of the detent torque plate (4).

Abstract: A current-energized synchronous motor (1) suitable in particular for vehicle drives. It includes a stator (2) and a rotor (3) carrying the energizer winding (7). The rotor (3) has at least two rotor poles (4) with one energizer winding (7) each. The rotor includes at least one selective magnetic flux barrier, in particular in the form of a radial slot (8) along the main axis (4A) of the rotor pole (4). This flux barrier is provided in each rotor pole (4) for increasing the reluctance moment of the current-energized synchronous motor (1).

Abstract: An arrangement for attaching a permanent magnet to the rotor of an electrical machine and such a rotor are provided. The rotor is assembled of sheets and includes at least two magnetic poles and a magnetic core. Permanent magnets are installable on a surface of the magnetic core, and a pole piece assembled of sheets is installable on a side of the permanent magnet that faces an air gap. At least one channel passing through the pole piece is built in the pole piece and magnetic core. A tightening strip is installable in the channel. The tightening strip is attachable to the pole piece using locking parts, and an end of the tightening strip facing the magnetic core includes fixing parts for attaching the tightening strip to the magnetic core.

Abstract: An electric machine includes a stator, and a rotor positioned adjacent the stator and configured to rotate with respect to the stator. The rotor includes a plurality of laminations having an outside diameter and stacked in a stackwise direction. Each lamination includes a plurality of non-linear slots positioned inward of the outside diameter. Each non-linear slot includes an inner portion spaced a first distance from the outside diameter and two end portions disposed a second distance from the outside diameter. The second distance is smaller than the first distance. The rotor also includes a plurality of permanent magnets. Each magnet is disposed in one of the non-linear slots.

Abstract: A dynamoelectric machine comprising a stator having a plurality of slots and teeth, armature windings wound around the teeth, and a rotor disposed inside the stator, wherein an alloy member is disposed in the inner periphery of the stator and the magnetic compensator has its surface or inside thereof a high resistance layer.

Abstract: An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple pair of permanent magnets for generating a magnetic field, which magnetic field interacts with the stator magnetic field to produce a torque.

Abstract: An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft.

Abstract: Permanent magnets are mounted within an electrical machine in a pitched saw-tooth pattern around the rotor shaft. This focused flux configuration provides for improved magnet mounting strength without resort to bonding or taping; provides improved rotor and stator cooling by access to the axial generator air flow; and provides for a simpler and more easily manufactured design. A laminated version of this basic structure provides for reduced surface losses and self-heating.

Abstract: A pole assembly for a rotor, the pole assembly includes a permanent magnet pole including at least one permanent magnet block, a plurality of laminations including a pole cap mechanically coupled to the pole, and a plurality of laminations including a base plate mechanically coupled to the pole.

Abstract: An electric machinery provided with a PM magnetic pole sandwiched by a permeable polar face and a magnetic circuit from an individual magnetic pole provides an innovative design of having disposed the PM magnetic pole sandwiched between the permeable polar face and the magnetic circuit from the individual magnetic pole to prevent PM magnetic pole from falling off and avoid PM magnetic pole magnetic force from being weakened by inverse excitation during the operation.

Abstract: A motor which has an improved energy efficiency, is excellent in practical use and has a generator function at the same time. The motor is provided with a basic factor 15 having working surfaces 55a and 55c on both sides thereof, respectively, and movable members 57 made of a magnetic material and arranged opposite to the working surfaces, respectively. Further, the basic factor 15 is provided with an electromagnet element 17 and permanent magnets 19 arranged on both sides thereof through contact surfaces, respectively, and the working surfaces and the contact surfaces are held opposite to each other through the permanent magnets 19, respectively.

Abstract: An electrical rotating machine having a rotor comprising a shaft made from non-magnetic material, a plurality of pole pieces made from magnetic material and surrounding the shaft, with permanent magnets fixed in receivers by wedges cooperating with the pole pieces to block radially outward movement of the magnets.

Abstract: To provide a rotor for a motor capable of effecting improved torque variation due to improvement in the induced voltage waveform and of effecting improved magnet torque in a permanent magnet type synchronous motor utilizing reluctance torque. A rotor 11 comprises a core 12 made of a ferromagnetic material, a given member of permanent magnets 14 are mounted in the outer surface of the core 12 circumferentially at equal intervals, and arrangement of the permanent magnets 14 is such that polarities N, S of the permanent magnets on the sides facing a stator are disposed alternately. Also, in the core 12 between the center axis of the core and the permanent magnets 14 are embedded arc-shaped permanent magnets 16 corresponding to the permanent magnets 14, respectively, and arrangement of the permanent magnets 14 is the same as that of the corresponding permanent magnets 16.

Abstract: A rotor for a synchronous motor includes two end plates and a number of laminated core members engaged on a shaft and secured together with a single fastener. The laminated core members have a number of radially arranged apertures for receiving a number of permanent magnets. One of the end plates has a number of inner ribs engaged into the apertures of the laminated core members and the other end plate has a number of inner cavities for receiving one ends of the permanent magnets such that the elements may be quickly secured together with the single fastener.

Abstract: A hybrid-type magnet includes an electromagnet having a U-shaped core made of a magnetic material. The core includes a core body having outer ends and a pair of opposing arms extending upwardly from the outer ends of the core body, wherein each opposing arm includes an upper end having an end surface. An excitation coil is wound on the core. The hybrid-type magnet also includes a bar-like engagement member including a permanent magnet having a direction of magnetization, the permanent magnet being disposed between magnetic members. The magnetic members are closely joined to the respective end surfaces of the arms, the permanent magnet being positioned between the arms of the core, whereby the end surfaces of the opposing arms extend in a direction substantially parallel to the direction of magnetization of the permanent magnet.