Abstract: A rotor includes magnets and a core including arcuately arranged pole segments. Each pole segment includes first and second prongs that extend away from the rotor axis and are at least in part arcuately spaced apart to define a cutout therebetween. Each pair of arcuately adjacent pole segments defines therebetween a respective magnet-receiving slot, with the first prong of one of the pole segments and the second prong of the other of the pole segments defining the slot. The magnets are received in slots, such that each of the magnets is at least in part interposed between one of the pairs of adjacent pole segments. The magnets and the pole segments are dimensioned and configured so that at least one of the first and second prongs is deflected by the magnet received in the respective slot, such that the prongs cooperatively apply a clamping force on the magnet.

Abstract: Provided is a waterproof fan which includes: a rotor; a stator including a winding; a circuit board supplying power to the winding; a resin frame including an undersurface located on one side of a rotation axis of a rotor, and a housing space opening on the other side of the rotation axis, to house the circuit board; a waterproofing resin portion covering the stator and closing an opening of the housing space; a bearing rotatably supporting the rotating shaft portion; and a cylindrical metal bearing holder extending along the rotation axis and supporting the bearing, in which the frame includes a tubular holder protection portion extending from the undersurface to the other side of the rotation axis and covering at least a part of an outer peripheral surface of the bearing holder, and the holder protection portion separates the stator from the bearing holder.

Abstract: A field magnet holder provided at a field portion of an electric motor is formed of a non-magnetic material. An inner wall and outer wall of the field magnet holder are respectively formed in annular shapes. Plural spacers are arranged between the inner wall and outer wall at a predetermined spacing in the circumferential direction. Sockets into which permanent magnets are inserted are formed between the spacers of the field magnet holder, plurally in the circumferential direction. Therefore, the permanent magnets may be easily assembled by being respectively inserted into the sockets. The plural permanent magnets are arrayed with magnetization directions thereof successively changed in steps of an angle that is a full cycle of electrical angles divided by a division number n, which division number n is any one integer that is at least three. Thus, ease of assembly of the permanent magnets is improved.

Abstract: A housing for an electric machine includes a substantially cup-shaped outer housing having a first base portion and a first tubular portion adjoining the base portion. An inner housing, which has a substantially cup-shaped form, is arranged in the outer housing and has a second base portion and a second tubular portion adjoining the base portion. A cover is connected or connectable to the outer housing and/or the inner housing. At least one cooling channel is formed between the first tubular portion and the second tubular portion. A pocket is formed in the first base portion and forms a first cavity together with the second base portion, and a second cavity is formed in the cover. The first cavity is fluidically connected to the cooling channel via a first bore and the second cavity is fluidically connected to the cooling channel via a second bore.

Abstract: Electromagnetic inertial force generators are provided, which include radially polarized permanent magnets providing bias flux across axial gaps to combine with axial coil flux to linearize the actuator output. Coil cooling in the electromagnetic inertial force generators is improved by embedding the coils in the stationary portion of the actuator, allowing for direct transfer of coil heat, and reducing oscillating stresses on coil leads.

Abstract: In an example, a rotor for an electric motor includes an inner hub, an outer rim, and a plurality of slats. Each slat of the plurality of slats has a first end at the inner hub and a second end at the outer rim. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle. Additionally or alternatively, a rotor for an electric motor includes a housing that includes a first retaining structure and a second retaining structure that are configured to apply a force that is directed radially outward against a magnet to hold the magnet against the housing. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle.

Abstract: The DC electric motor has a stator which comprises a permanent magnet with a number p of pole pairs, and has a rotor which can rotate in relation to the stator and has a hollow-cylindrical iron-free winding with a geometric axis and a number Q of sub-coils, and a collector with a number K of collector segments, wherein the sub-coils are arranged distributed over the periphery of the rotor. The brush-commutated DC electric motor furthermore has at least one pair of brushes which are in contact with the collector and by means of which the sub-coils are energized. The arrangement of the brushes and the interconnection of the sub-coils are selected in such a way that in each case a number n?2 of sub-coils, which are each arranged offset by 360°/n in a rotationally symmetrical manner with respect to the axis of the rotor, are always supplied with the same current at the same time.

Abstract: A downhole electric submersible pump (ESP) assembly. The downhole ESP assembly comprises a hybrid permanent magnet motor (PMM) comprising a first drive shaft, a stator, and a rotor comprising a first permanent magnet element, a second permanent magnet element, and an induction squirrel cage, wherein the rotor is mechanically coupled to the first drive shaft and disposed within the stator; a seal section having a second drive shaft coupled to the first drive shaft; and a pump assembly having a third drive shaft coupled to the second drive shaft.

Abstract: A bearing for a rotating electric machine. The bearing includes a plastic body and at least one electrical conductor fixed to the plastic body in a non-detachable manner.

Abstract: The disclose provides a magnetic levitation gravity compensation device, including: a first permanent magnet, which is cylindrical; a second permanent magnet, which is cylindrical, arranged in the first permanent magnet and radially spaced from the first permanent magnet; and at least one end permanent magnet, which is cylindrical, and is located on at least one of two axial ends of the second permanent magnet and axially spaced from the two axial ends of the second permanent magnet, a center line of the end permanent magnet is configured to coincide with a center line of the second permanent magnet, and a cylinder wall thickness of the end permanent magnet is smaller than that of the second permanent magnet, wherein a magnetization direction of the first permanent magnet is a radial direction, and a magnetization direction of the second permanent magnet and the end permanent magnet is an axial direction.

Abstract: A motor according to the present application includes a rotor including a magnet, a yoke including an inner side surface around the magnet and having an annular shape, and a holder configured to hold the yoke. The yoke includes an end portion at the holder side in a rotating shaft (X) direction of the rotor. An outer side surface of the holder fits in an inner side surface of the yoke. The end portion of the yoke at the holder side and an outer side surface of the holder engage with each other.

Abstract: In this armature, facing surfaces which are portions where a first segment conductor and a second segment conductor are joined together are disposed so as to overlap each other as viewed in a radial direction, and an end part of at least one of the first segment conductor and the second segment conductor is provided with chamfered parts at edge parts on both circumferential sides of the end part.

Abstract: This is a novel magnetic configuration that is to be used to build extra efficient PM motors. This magnetic configuration uses mono polarities of permanent magnet as field-poles instead of dipolar field-poles configuration. Armature teeth are built, energized and used very differently in this magnetic configuration. This configuration revitalizes repulsive force three times inside a running PM motor without using more than usual current. Revitalized repulsive force allows using very strong permanent magnets, which produces heavy attractive force in the same running motor. The revitalized repulsive force along with the heavy attractive force produces extra output power in the motor at no-cost. This magnetic configuration is self-sufficient and unparalleled. It could only be implanted in new designs of PM motors. This magnetic configuration has been built around new experimental findings.

Abstract: A rotor of an electric machine includes: N pole pieces, each of the N pole pieces including two half pole pieces, where N is an integer greater than 2; apertures through the half pole pieces, respectively; permanent magnets disposed within the apertures, respectively, the permanent magnets including, in each of the N pole pieces, a first permanent magnet of a first magnetic polarity and a second permanent magnet of a second magnetic polarity; and structural non-magnetic portions disposed in gaps of the half pole pieces, respectively, and configured to magnetically disconnect a rotor web from a q-axis flux guide.

Abstract: A motor unit according to an aspect of the present invention includes: a motor having a rotor that rotates about a motor axis and a stator located radially outside the rotor; an inverter that controls a current to be supplied to the motor; a housing body having a motor housing portion that houses the motor and an inverter housing portion that houses the inverter; and an inverter housing configured to cover an opening of the inverter housing portion while supporting the inverter. The housing body is provided with a first cooling path through which a first refrigerant for cooling the motor flows. The inverter housing is provided with a second cooling path through which a second refrigerant for cooling the inverter flows.

Abstract: A rotor includes a rotor core having a plurality of magnetic poles. At least one magnetic pole includes a first magnetic pole having three or more circumferentially arranged magnet holes, and a plurality of permanent magnets housed corresponding magnet holes. A portion of the rotor core between adjacent magnet holes has a radially extending region. A maximum radial dimension of each magnet hole is greater than a minimum radial dimension of a portion of the rotor core between a magnet hole radially outer surface and a rotor core outer peripheral surface. The first magnetic pole has a smaller amount of harmonic components in a radial flux density distribution on the rotor core outer peripheral surface, compared to a magnetic pole having a plurality of magnet holes arranged at equal circumferential intervals and a plurality of permanent magnets having substantially the same magnetic flux and number.

Abstract: The present disclosure relates to electrical machines, cooling systems and methods for cooling active elements of electrical machines. More in particular, the present disclosure relates to cooling systems and methods for cooling active rotor and/or stator elements of a generator of a wind turbine, e.g. of a direct drive wind turbine. A cooling method comprises supplying a cooling fluid to an air gap through one or more primary inlets of an electrical machine for cooling a plurality of active elements of a rotor of the electrical machine and/or a plurality of active elements of a stator of the electrical machine separated by the air gap. The method further comprises reversing a direction of flow of the cooling fluid such that the cooling fluid is extracted from the electrical machine through one or more primary inlets.

Abstract: Systems and methods for cooling an electric motor in an electric drive unit are provided. In one example, the electric drive unit includes electric motor with a housing with a water jacket arranged therein, a stator that includes a plurality of stator laminations positioned within the housing, and an oil inlet mounted to and extending through the housing. The plurality of stator laminations includes a radial opening that is designed to receive oil from the oil inlet and direct oil to one or more oil ducts that axially extend through at least a portion of the plurality of stator laminations.

Abstract: An electric machine may include a stator, a rotor, a housing, and at least one heat transmission body. The housing may at least partially surround a housing interior. The housing may include a plurality of housing parts, which may bound the housing interior and on which the rotor is rotatably mounted via a bearing device. The heat transmission body may be arranged along the axial direction between at least one housing part of the plurality of housing parts and the rotor. The at least one heat transmission body and the at least one housing part may bound a coolant space through which a coolant is flowable. At least one of the plurality of housing parts may include an attachment section to which the at least one heat transmission body is attached. The bearing device may be disposed on the attachment section.

Abstract: The present invention relates to a coil arrangement and a moving field electromagnetic machine using same, the coil arrangement being characterized by comprising a first coil arrangement and a second coil arrangement that are formed spaced a predetermined distance apart from each other and have a mirror image in the spaced apart direction, wherein: the first coil arrangement includes at least one first half cycle and at least one second half cycle that are formed adjacent to each other; the first half cycle includes at least two coils having currents flowing in different directions; and the first half cycle and the second half cycle have a mirror image in the direction in which the first and second half cycles are adjacent, thereby maximizing efficiency and increasing power by minimizing the magnetic flux leakage and the core loss.