Abstract: A linear transport system includes: a stator module including an iron core that includes a plurality of teeth and a coil wound around the iron core; a movable element that includes a plurality of identical magnets disposed on a side surface parallel to a moving direction, and is propelled by an electromagnetic force from the coil; and a motor drive control device that controls the movable element by supplying an independent current of single-phase AC individually to the coil included in the stator module. When Lm is a magnet pitch that is a pitch of the magnets disposed in the movable element, and Lt is a tooth pitch that is a pitch of the teeth, 1.3?Lm/Lt?1.4 is satisfied.

Abstract: A component (20; 18; 100) is described for cooling the windings of an electric motor (10) comprising: an outer ring (30), an inner ring (40) concentric to the outer ring, linear segments (50) extending radially from the inner ring towards the outer ring, wherein the rings (30, 40) and the segments (50) are internally hollow and joined together to form a continuous channel inside them capable of carrying a cooling fluid along a path that stats at a ring and passes to the other ring, preferably coming back to the starting ring, the rings (30, 40) and the segments (50) being arranged to delimit pass-through openings (36) able to accommodate and surround the motor windings.

Abstract: Provided is a unit including: a motor case configured to accommodate a motor, a gear case configured to accommodate a gear connected to the motor; and a cover having a portion sandwiched between the gear and the motor, in which the motor case communicates with the gear case via an opening of the cover, and the opening is positioned below a horizontal plane passing through an axis of the gear and orthogonal to a gravity direction.

Abstract: A generator comprising a series of spaced annular stators sandwiched between a series of rotors, the rotors each being separated by annular collars, the annular collars defining a central cavity; at least one cooling gas source for supplying gas to the central cavity; vents through the annular collars for providing a means of egress for the cooling gas from the central cavity radially outwards over the rotors and the annular stators and the front, rear and side walls of coils embedded in the annular stators.

Abstract: A breathing device includes a ventilator, which is arranged on an end surface of the control unit provided with a connector on an opposite side of an output shaft of a rotating machine so as to protrude from an inside of the electric power steering device toward an outside of the electric power steering device, and is configured to provide a breathing action through ventilation between the inside and the outside. The ventilator protrudes in a horizontal direction or upward with respect to the horizontal direction.

Abstract: An outer-rotor brushless direct-current motor is provided. The motor includes a motor can that supports the motor components and a fan mounted on a rotor shaft inside the motor can to generate an airflow through the motor can. The motor can includes exhaust openings formed around the fan to allow the airflow to be expelled radially away from the fan, and intake openings formed at a distance from the exhaust openings to allow an airstream to be received radially into the motor can.

Abstract: An electric motor system (100), comprising: a motor unit (110) comprising: a first part (120); a second part (130) movable relative to the first part (120); a plurality of spaced activatable motor elements (140) provided on the first part (120), each activatable motor element (140) being operative when activated by application of an electric current thereto for creating relative movement between the first and second parts (120, 130); and a plurality of power electronics drive modules (150), each power electronics drive module (150) being operatively associated with a different subset of the plurality of activatable motor elements (140) and comprising a power converter (155) operative to convert direct current into a periodic current for powering the activatable motor elements (140); and a power supply arrangement (170) comprising: at least one direct current power source (180); and a plurality of n parallel direct current power supply lines (190), each of the parallel direct current power supply lines (190) b

Abstract: Heat sink for an electric motor, in particular for a wheel hub drive of a commercial vehicle, with a channel which connects a first connection of the heat sink and a second connection of the heat sink, wherein the channel winds around the heat sink in a spiral. With such a heat sink, a flow condition of coolant within the channel can be generated in which secondary vortices are formed, and the cooling capacity is significantly improved.

Abstract: An electric motor assembly includes a stator, a rotor, a motor housing, a rotatable shaft, a radial fan, and an air scoop. The motor housing at least partly houses the stator and rotor and presents an exterior motor surface. The rotatable shaft is associated with the rotor for rotational movement therewith, with the rotatable shaft extending along a rotational axis. The radial fan is mounted on the rotatable shaft exteriorly of the motor housing and is rotatable with the shaft to direct airflow in a radially outward direction. The air scoop extends radially outwardly relative to the radial fan and axially to receive radial airflow from the radial fan and turn the airflow axially to flow along the exterior motor surface. The air scoop includes spaced apart axially extending airflow vanes to guide the airflow as the airflow is turned axially.

Abstract: An electronically commutated rotating electric machine comprising a first housing part, housing the active core of the machine and a second housing part that houses the control drive, wherein the first and second housing parts are configured such that, after being connected to one another, a gap is formed between them; the parts having deflecting portions that are configured to direct an air flow into the gap.

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: An axial flux machine having a stator which is located between a first rotor disk and a second rotor disk. The base part of the stator is a central support flange which defines a first lateral face and a second lateral face. The central support flange has a plurality of flow openings. A first, left stator cover is mounted, with a formed collection channel, on the first lateral face of the support flange, and a second, right stator cover is mounted, with a formed distribution channel, on the second lateral face of the support flange.

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: An EC motor with an encapsulated electronic controller. The electronic controller is encapsulated by creating a silicone mold to include sufficiently detailed voids so that certain parts of the electronic controller adjacent the voids are encapsulated and other parts adjacent where the mold has no voids are left unencapsulated.

Abstract: A stator cooling structure in which the stator cooling structure includes a supporting member that has a cylindrical shape along an axial direction of a rotating electric machine, that supports a stator core of the rotating electric machine, and that forms a cooling water passage and oil passage, and the stator core, the cooling water passage, and the oil passage are disposed adjacent to each other in this order from an inner radial side.

Abstract: A water jacket includes a housing configured to be disposed on or adjacent to an outer periphery of a heat generating portion, and a coolant channel provided inside the housing. The coolant channel includes a plurality of main tubular channel portions that extend linearly and are configured to be arranged along and in proximity to the outer periphery of the heat generating portion, an inflow-side manifold portion that collectively connects upstream end portions of the main tubular channel portions and is configured to allow inflow of coolant, and an outflow-side manifold portion that collectively connects downstream end portions of the main tubular channel portions and is configured to allow outflow of the coolant. Each of the main tubular channel portions includes therein a vortex generation part that is disposed in proximity to the upstream end portion and configured to generate a vortex flow.

Abstract: An impeller is provided, including a metal housing, a shaft, and a plastic member. The metal housing has a shaft mounting hole. The inner surface of the shaft mounting hole includes three or more contact points, and the contact points are closer to the shaft than other portions of the inner surface of the shaft mounting hole. The shaft passes through the shaft mounting hole and is affixed by the contact points. The metal housing divides the shaft into an upper section, a middle section, and a lower section. The plastic member passes through the shaft mounting hole and is in contact with the middle section.

Abstract: The invention relates to an electric machine (1) having a rotor (3), a stator (2) and several rigid winding pieces (5) formed as hollow conductors, which form various coils of a winding (4) of the electric machine (1) and are each part of a cooling circuit of the electric machine (1). According to the invention, the winding pieces (5) each have at least one lateral tap (34) in the region of their end sections (8), via which tap a coolant can be fed into the winding pieces (5) or removed from the winding pieces (5).

Abstract: The motor comprises: a stator around which coils are wound and which forms a rotating magnetic field rotating a rotor; and a first motor case housing the stator. The stator has: a core body portion forming an annular magnetic path; and a fastening portion projecting outside in the radial direction from the outer circumferential surface of the core body portion. The fastening portion has an attachment hole which is formed in a penetrating manner along the rotating axis line direction of the rotor and into which a fastening screw for fixing the stator to the first motor case is inserted. The first motor case has: first to third core receiving portions receiving an end portion of the core body portion in the rotating axis line direction; and first and second fastener receiving portions receiving an end portion of the fastening portion in the rotating axis line direction.

Abstract: An electric machine includes a hollow-cylindrical stator and at least two receiving elements, each receiving element at least partially enclosing the stator in a circumferential direction along an inner coverage length and conjointly connected to the stator in the circumferential direction along an inner fastening length. A stator housing is conjointly connected to the receiving elements in the circumferential direction along the outer fastening length. The inner fastening length extends at most along 120° in the circumferential direction, and the outer fastening length extends at most along 200° in the circumferential direction.

Abstract: A motor assembly for driving a pump or rotary device features a power plane with a circular geometry to be mounted inside a space envelope having a similar circular geometry formed on an end-plate between an inner hub portion and a peripheral portion that extends circumferentially around the space envelope of the end-plate. The power plane is a multi-layer circuit board or assembly having: a power layer with higher temperature power modules for providing power to a motor, a control layer with lower temperature control electronics modules for controlling the power provided to the motor, and a thermal barrier and printed circuit board layer between the power layer and the control layer that provides electrical connection paths between the power modules of the power plane and the control electronics modules of the control layer, and also provides insulation between the power layer and the control layer.

Abstract: Electric machine, in particular an electric motor for driving at least one compressor or circulator, comprising a stator and a rotor that are disposed in a casing, the machine comprising a cooling device disposed around the stator and comprising a circulation circuit for a cooling fluid, characterized in that the cooling device comprises a circulation pipe for the cooling fluid, comprising a portion embedded in a mass of material with high thermal conductivity such as metal or a metal alloy.

Abstract: An energy conversion device includes a set of nozzles passing through the body of a shaft and configured to form an oil mist in the cavity under the effect of the rotation of the shaft in a range of rotational speeds, from a proportion of oil injected into the shaft, to cool a rotor module and a stator module, a duct secured to the shaft and comprising an inlet communicating with the internal volume so as to receive, under the effect of the rotation of the shaft, oil injected into the internal volume, the duct leading the other proportion of the oil as far as an outlet of the duct, a removal device for removing the oil leaving the duct to an oil reservoir without contributing to the oil mist.

Abstract: Various disclosed embodiments include illustrative sprayer assemblies, electric motor assemblies, and vehicles with cooling assemblies for stator windings of electric motors. An illustrative sprayer assembly includes a first spray device assembly configured to receive a fluid and further configured to spray the fluid therefrom. A second spray device assembly is configured to receive the fluid and is further configured to spray the fluid therefrom. A connecting tube is fluidly couplable to the first spray device assembly and the second spray device assembly and is configured to provide the fluid from the first spray device assembly to the second spray device assembly.

Abstract: Air circulation passages connect an accommodation space of an electronic control unit to the outside to circulate air to buffer internal pressure fluctuations. The accommodation space side of the air circulation passages is formed as a divided air circulation passage with a plurality of passages, a cooling object member is arranged to come in thermal contact with air flowing through the divided air circulation passage, and the total cross-sectional area of the divided air circulation passage is smaller than the cross-sectional area of the air circulation passages that are not divided. Because the accommodation space of the electronic control unit is connected to the outside, internal pressure fluctuations can be buffered, and increasing the flow velocity of the air flowing through the divided air circulation passage on the accommodation space side of the air circulation passages allows heat inside the accommodation space to be efficiently radiated to the outside.

Abstract: An electric drive unit and method of assembling the same is disclosed. The electric drive unit includes a rotor having a rotor shaft, and gear shaft, where the rotor shaft is inserted into the gear shaft. The gear shaft is supported by two bearings, while the rotor shaft supported directly at one end by a bearing and at the other by the gear shaft. A wave spring is also disclosed that provides an axial loading to the rotor shaft. Also disclosed is a balancing ring secured to an end of the rotor via a locknut. The balancing ring can be machined in order to balance the rotor. The rotor shaft can be connected to the gear shaft via a spline connection. The rotor shaft can bear against the gear shaft via a pilot journal and pilot bore defined on the rotor shaft and gear shaft respectively.

Abstract: An electric machine with a stator, a rotor, and a fluid cooling device. The rotor is supported by a rotor shaft and a first bearing arranged at a bearing shield. The fluid cooling device has a cooling tube secured to a carrier element in fluidic communication with a fluid input and output and extends inside a recess of the rotor shaft while forming an annular space. A sealing element is provided between the rotor shaft and the carrier element, which prevents fluid passage into a spatial region of the electric machine outside of the sealing region. A second bearing is axially spaced apart from the first bearing is between the rotor shaft and a second bearing shield for supporting the rotor. The rotor core extends in a space between the first bearing and second bearing, and the recess extends inside the rotor shaft axially to the second bearing.

Abstract: A cooling system for an electric machine is provided that includes a housing at least partially enclosing a rotor, a stator, and a coolant jacket, the coolant jacket including a plurality of coolant channels that receive coolant from a coolant inlet. In the cooling system two or more materials that form boundaries of the plurality of coolant channels are configured to thermally expand at different rates and form a bypass flow passage of at least one of the plurality of coolant channels when the two or more materials are below a threshold temperature or within a lower temperature range.

Abstract: The present disclosure provides a method for reducing the electromagnetic vibration of a fractional slot concentrated winding (FSCW) permanent magnet (PM) motor, which provides a guidance for the low vibration design of FSCW PM motor. The implementation of the method includes: Based on Nyquist Shannon sampling theorem, the modulation effect of electromagnetic force in the air gap is obtained, and the electromagnetic force component that contributes the most to the electromagnetic vibration of the FSCW PM motor is determined. The equivalent analytical model of PM flux density is established to obtain the phase relationship between different flux density harmonics. According to Maxwell stress equation, the internal relationship between each order of flux density harmonics and electromagnetic force harmonics is obtained. A new magnet structure of the PM motor is designed, and specific flux density harmonics are injected to reduce the electromagnetic force and electromagnetic vibration of the FSCW PM motor.

Abstract: A partition wall of a drive device has a first partition wall and a second partition wall. The first partition wall extends in a direction intersecting with an axial direction and covers one end portion of a motor housing in the axial direction. The second partition wall extends in a direction intersecting with the axial direction and is disposed on one side in the first direction perpendicular to the axial direction with respect to the first partition wall, and covers the other end portion of the gear housing in the axial direction together with the first partition wall. The second partition wall is disposed on one side in the axial direction with respect to the first partition wall.

Abstract: An electric machine system is provided. The system includes a stack of a plurality of stator laminations with at least a portion of the plurality of stator laminations each including a plurality of holes that are arranged radially outward from a plurality of teeth, where the plurality of holes include a first set of holes, a second set of holes, and a third set of holes, where the first, second, and third sets of holes has a different profile and/or area, where the second set of holes are positioned radially inward from the third set of holes; and where a plurality of oil channels are formed by an alignment of holes in adjacent stator laminations in the portion of the plurality of stator laminations.

Abstract: An electric machine includes a rotor and a stator. The rotor is configured to generate rotational motion. The stator is disposed radially about the rotor. The stator has a core and windings. The core defines a first array of orifices about an inner diameter of the core and a second array of orifices radially outward from the first array of orifices. The windings are disposed within the first array of orifices. A magnetic material is configured to advance into and retract from the second array of orifices to adjust a magnetic flux within an airgap defined between the rotor and the stator.

Abstract: A stator of an electrical coolant drive includes a stator assembly having a number of stator teeth that are provided with coils of a multi-phase stator winding, and a contact device disposed on the stator assembly on an end side for interconnecting the coils with the phase connections. A deflection region is provided on the outer periphery of the contact device in the region of an inlet of the coolant drive for a fluid flowing in through the inlet. A contact device and an electric coolant drive are also provided.

Abstract: In a rotating electrical machine, a holder member is disposed to be radially closer to an armature coil than to a magnetic field generator. The holder member is configured to hold the armature coil. The holder member has a first portion that faces a first end portion of the armature coil, and a second portion that faces a second end portion of the armature coil. The first portion of the holder member is thermally coupled to the first end portion of the armature coil. The second portion of the holder member is thermally coupled to the second end portion of the armature coil.

Abstract: An embodiment may provide a motor comprising: a stator including stator teeth; and a rotor including a magnet, wherein the stator teeth include a first stator tooth and a second stator tooth disposed within the first stator tooth, wherein the first stator tooth includes a plurality of first teeth, the second stator tooth includes a plurality of second teeth, wherein the first teeth radially overlap the second teeth at the center of the stator in a radial direction, the motor further comprising: a sensor and a collector disposed between the first stator tooth and the second stator tooth in the radial direction, and the motor further comprising: a circuit board on which the sensor is disposed; and a housing accommodating the circuit board, wherein the collector includes a first collector and a second collector disposed within the first collector, the sensor is disposed, in the radial direction, between the first collector and the second collector, and the housing includes a first protrusion, wherein the first p

Abstract: An electric motor can include a stator body defining fluid channels extending axially for fluid communication between axial ends of the stator body. Conductive windings can form first loops extending axially outward from the first end of the stator body and second loops extending axially outward from the second end of the stator body. A first cap can be coupled to the first end of the stator body and can include a first wall. The first wall can be between the first loops and the channels. Pins can extend from a side of the first wall that is opposite the first loops. The second cap can be coupled to the second end of the stator body and include a second wall. The second wall can be between the second loops and the channels. Pins can extend from a side of the second wall that is opposite the second loops.

Abstract: The disclosure relates to an electric motor comprising a base motor module and a plug module which is electrically and mechanically connected to the base motor module and is designed as an electronics module. The electronics module comprises a power electronics system, a driver electronics system and a control electronics system, and the electronics module and the base motor module each dissipate heat via separated heat paths. The disclosure further relates to an electric motor arrangement and also to a construction kit for electric motors.

Abstract: A stator of a directly driven wind turbine generator includes a stator support, and stator segments arranged around a circumference and positioned on flanges of the stator support. Each stator segment includes a segment support having a cavity. Securing devices secure the stator segments via the segment supports to the flanges of the stator support. The securing devices have each an intermediate piece to complement the cavity of a corresponding one of the segment supports, and an alignment pin to secure the intermediate piece in position and to adjust an air gap of the wind turbine generator.

Abstract: An electric motor includes a stator, a rotor, and a housing. A slot in a stator core of the stator includes a coil housing and a slot opening that opens the coil housing radially inward. A coil includes a coil end that protrudes in an axial direction from an axial end surface of the stator core. A plastic portion that is integral with the stator core includes a blocking portion that extends in the axial direction so as to block the slot opening, and a cylindrical wall that is coupled with the blocking portion. The cylindrical wall protrudes in the axial direction from the axial end surface of the stator core. The housing defines a coil end cooling channel in which a cooling liquid flows to cool the coil end, at a location radially outward from the cylindrical wall.

Abstract: An electric motor cooling jacket enclosing a surface of an electric motor stator and having protuberances adapted for contact with the surface of the stator, with fluid passageways formed by the cooling jacket body, the protuberances, and the surface of the electric motor stator, wherein the fluid passageways are arranged to permit a cooling fluid to flow in a serpentine path across the surface of the stator to remove heat from the stator. Spray rings are fluidly coupled with the fluid passageways so as to permit the cooling fluid to flow into the fluid passageways, across the outer circumference of the electric motor stator, and out from orifices in the spray rings to cool the windings of the stator. The protuberances are formable using a pair of mold halves aligned anti-symmetrically with one another so that a serpentine fluid path is formed when casting the cooling jacket body.

Abstract: A fan includes a frame, an impeller and a motor. The impeller includes a hub, a plurality of blades, first air-guiding plates and second air-guiding plates. The hub has a tapered shape. A width of the hub gradually increases along a direction from a top portion of the hub to a bottom portion of the hub. The hub has at least an air vent. The blades are disposed around an outer periphery of the hub. The first air-guiding plates and the second air-guiding plates are disposed around an inner periphery of the hub. The first air-guiding plates are arranged between two of the second air-guiding plates in staggered. The second air-guiding plates are arranged between two of the first air-guiding plates in staggered. The first air-guiding plates and the second air-guiding plates have different thicknesses, heights or shapes.

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: An auxiliary fan based hybrid cooling system of an electric machine is contemplated. The hybrid cooling system comprises a propeller positioned on an exterior portion of an enclosure and mechanically coupled to a rotor, at least one electronic component, a stator, the rotor, and an auxiliary fan disposed within the enclosure, and wherein: in a single cooling mode, the propeller rotates to generate air that is channeled into the enclosure, in a dual cooling mode: the propeller rotates to generate the air that is channeled into the enclosure, a coupling mechanism simultaneously engages the rotor and the auxiliary fan and links the propeller to the auxiliary fan by the engaging of the rotor with the auxiliary fan, and the auxiliary fan, rotates responsive to the rotation of the propeller in the dual cooling mode.

Abstract: An electric machine for a vehicle is disclosed. The electric machine includes a stator and a rotor rotatable relative to the stator about a rotational axis that defines an axial direction. A housing at least partially surrounds a housing interior and includes a first housing part and a second housing part that bound the housing interior. The rotor is rotatably mounted on the first housing part and the second housing part via a bearing device. At least one heat transmission body is arranged along the axial direction between at least one of the first and second housing parts and the rotor. The heat transmission body bounds, together with the at least one of the first and second housing parts, a coolant space through which a coolant can flow.

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: Provided is a vehicle power unit as well as a vehicle wheel bearing assembly with a generator which allow a wheel bearing to be easily replaced and thereby can suppress the costs of replacement components. The vehicle power unit includes: a wheel bearing including an outer ring and a hub axle that includes a hub flange and is rotatably supported by the outer ring through a rolling element, the hub flange being configured to be attached with a wheel and a brake rotor of a vehicle; and a motor or a generator including a stator located on an outer periphery of the outer ring and a rotor located on an outer periphery of the stator and attached to the hub axle. The vehicle includes a knuckle provided with a wheel bearing fixing member. The outer ring or the stator is removably fixed to the wheel bearing fixing member.

Abstract: The power transmission device has the rotating electric machine, the housing that houses the stator of the rotating electric machine, and the pipe as a refrigerant liquid feeding member that has the holes. In the upper part of the housing is provided the opening that introduces oil ejected from the holes. In the lower part of the housing is provided the oil reservoir that forms an oil pool.

Abstract: A cooling structure intended to cool a rotating electrical machine (ME). The cooling structure includes a solid metal body (CM) having an overall tubular form delimited radially by a first contact surface, intended to completely radially surround the electrical machine and to be in physical contact with the electrical machine, and by a second contact surface completely radially surrounding the first contact surface and intended to be in physical contact with a first power module of the set of at least one power module so as to be able to cool the electrical machine and the power module, the cooling structure comprising a set of at least one cooling channel (CR1, CR2, CR3, CR4) formed in the solid metal body (CM), at a distance from the first contact surface and from the second contact surface, wherein a coolant is intended to circulate.

Abstract: A system for cooling and lubricating a rotor shaft bearing of an electric machine is provided. In one example, the system includes a plurality of oil passages that extend axially through a rotor shaft and open into a sealed cavity near a housing interface between an electric machine housing and gearbox housing to route oil to the rotor shaft bearing for cooling and lubrication thereof.

Abstract: A rotor tube for an electric machine of a vehicle includes an outer tube and first and second coupling sections coupled to the outer tube at opposite end regions of the outer tube relative to a longitudinal axis of the rotor tube. First and second hubs are coupled to the outer tube at the opposite end regions of the outer tube relative to the longitudinal axis of the rotor tube. A ventilation element is coupled to the outer tube. An inner tube is disposed within the outer tube relative to the longitudinal axis of the rotor tube such that the outer tube surrounds the inner tube. At least two components selected from the first coupling section, second coupling section, first hub, second hub, outer tube, ventilation element and inner tube are formed in one piece as a cast component.