Abstract: An example motor rotor includes a cylindrical magnet which is disposed around a rotation shaft, a protective layer which is disposed around the magnet, and a middle resin portion which is disposed between the magnet and the protective layer. The magnet has a cylindrical shape that extends continuously in a circumferential direction of the rotation shaft. A surface treatment portion is formed on at least one of an outer peripheral surface of the magnet or an inner peripheral surface of the protective layer, to impart adhesion with the middle resin portion.

Abstract: Disclosed is a method and a system for pretensioning fiber-reinforced plastic (FRP) sleeves surrounding an assembly of parts. The method includes application of pretensioning FRP sleeves surrounding a permanent magnet rotor with surface magnets.

Abstract: A rotor includes a shaft extending in an axial direction, a cylindrical magnet portion provided at an outer peripheral portion of the shaft, a cylindrical scattering-prevention member provided so as to cover an outer peripheral surface of the magnet portion, a first balancing member provided at one end of the magnet portion in the axial direction, and a second balancing member provided at the other end of the magnet portion in the axial direction from which one end side of the shaft extends in the axial direction and having a diameter smaller than the inner diameter of the scattering-prevention member and the second balancing member has an end surface in contact with the magnet portion, the end surface being not surrounded by the scattering-prevention member.

Abstract: A rotor of the present invention includes a rotor core in which a shaft through-hole and a magnet insertion hole that form a plurality of layers in a radial direction toward a central axis of the shaft through-hole are formed, and a magnet press-fitted into the magnet insertion hole, and the rotor core includes a reinforcement part between the shaft through-hole and a first magnet insertion hole disposed on outermost side in the radial direction.

Abstract: An electric motor and an electric toy, wherein the electric motor includes a stator assembly, a rotor assembly, a front end cover assembly, a rear end cover assembly, a three-phase power line, and a data transmission line. The rotor assembly is sleeved on the stator assembly. The rotor assembly includes a magnetic ring, a magnetic knitting frame, an iron core, several tile-shaped magnets, a rotating shaft, and a rotor end plate. A positioning slot is arranged between adjacent tile-shaped magnets. The magnetic knitting frame is provided with a positioning boss that is inserted into the structure of the positioning slot. The electric motor allows the accurate positioning and assembling of the rotor assembly, so that the magnetic poles of the magnetic ring correspond to the magnetic poles of the tile-shaped magnet.

Abstract: A rotor assembly includes a plurality of segmented magnets on an outer surface of a rotor core, a metallic layer on the outer surface of the plurality of segmented magnets, and a plurality of segmented metallic bands on the outer surface of the metallic layer. The plurality of segmented metallic bands is configured to secure the plurality of segmented magnets to the outer surface of the rotor core, and each band of the plurality of metallic bands has an axial length less than an axial length of the rotor.

Abstract: A motor for a surgical instrument includes a rotor and a stator. The rotor includes a shaft and a magnet. The stator includes (i) a cavity in which the rotor is disposed, and (ii) a coil assembly. The coil assembly includes multiple phase sets. The phase sets include multiple sets of wires. Each of the phase sets includes multiple coils and corresponds to a respective one of the sets of wires. The coils in each of the phase sets are at respective positions about the rotor. One of the sets of wires includes at least three wires. The stator causes the rotor to axially rotate a surgical tool of the surgical instrument based on current received at the sets of wires.

Abstract: Embodiments of the present invention are directed to a generator for connecting to a predefined load, where the generator is designed and constructed to meet one or more requirements of the predefined load. In specific embodiments the one or more requirements include providing a minimum output voltage while starting the predefined load at or above ambient temperature and providing an output voltage that does not exceed an upper voltage limit while being driven at full speed without any load current at or below ambient temperatures, while maintaining high efficiency under a specified full load running condition and keeping the overall cost and size of the generator low.

Abstract: Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.

Abstract: A rotor including a first rotor part and a second rotor part which are disposed in a shaft direction is provided. The first rotor part includes a first rotor core, a plurality of first magnets disposed on an outer circumferential surface of the first rotor core, and a first holder configured to fix the plurality of first magnets. The first holder includes a first body in a cylindrical shape, a first plate which is connected to the first body and configured to cover the plurality of first magnets, and a plurality of first coupling protrusions which protrude from an inner circumferential surface of the first body and are coupled to the first rotor core. A motor is also provided.

Abstract: A rotor assembly for an electric motor for a turbomachine defines an axis of rotation. The rotor assembly includes a jacket member that is hollow and that defines an inner radial surface facing inwardly toward the axis of rotation. Furthermore, the rotor assembly includes a magnet member that is received within the jacket member. The magnet member includes an outer radial surface facing outwardly from the axis of rotation. The jacket member is made of a sintered composite material having carbon filament and a sintered matrix. Additionally, the inner radial surface of the jacket member abuts against the outer radial surface of the magnet member to retain the magnet member in a radial position relative to the axis.

Abstract: The stator includes a stator core, a support electric wire formed by one or more conductive wires, and a drive electric wire formed by one or more conductive wires. The stator core includes an annular shaped back yoke and a plurality of teeth on an inner periphery of the back yoke. The support electric wire is disposed so as to pass through a plurality of slots respectively formed between the teeth, and forms a winding portion that generates an electromagnetic force for supporting the rotor in a non-contact manner by being energized. The drive electric wire is disposed so as to pass through the plurality of slots, and forms a winding portion that generates an electromagnetic force for rotating the rotor by being energized. A cross-sectional area per conductive wire of the support electric wire differs from a cross-sectional area per conductive wire of the drive electric wire.

Abstract: A breathing assistance apparatus has a pressurised gases source featuring a lightweight impeller with a plastic shaft. The impeller is shroudless. The plastic shaft is supported within the stator by a bearing structure. The resilient motor mount couples the stator and the housing and provides compliance and/or damping for the motor.

Abstract: A radial flux rotary electric machine having an exterior-rotor configuration is shown. The machine has a permanent-magnet rotor comprising permanent magnets in a Halbach array, and an air-cored stator interior to the rotor having teeth defining tapered slots and distributed windings around the teeth to form coils in a double-layer arrangement, the windings being comprised of a plurality of phase windings. For each tooth T having a slot S1 on one side thereof and a slot S2 on another side thereof, a coil side C1 of a phase winding is arranged to occupy a radially inner layer of the slot S1 and a coil side C2 of the same phase winding is arranged to occupy a radially outer layer of the slot S2, wherein the coil side C1 has a smaller circumferential dimension and a larger radial dimension than the coil side C2.

Abstract: An electric motor housing with cooling includes: a housing, the housing having a round cross-section, an outer shell, a terminating wall and an inner shell, the housing being formed as a one-piece lightweight metal cast component. A cooling gap is formed between the outer shell and the inner shell and a spiral-shaped element is arranged in the cooling gap. The spiral-shaped element includes a spiral-shaped cooling channel which runs between the windings of the spiral-shaped element.

Abstract: A rotor includes: a plurality of permanent magnets divided at regular intervals in a circumferential direction around a shaft, and provided in an axial direction; a first protection ring for positioning and holding ends in the axial direction of the permanent magnets; a second protection ring for positioning and holding other ends in the axial direction of the permanent magnets; and a protection cover covering outer circumferential surfaces of the permanent magnets, the first protection ring, and the second protection ring, and having a uniform thickness in a radial direction.

Abstract: A motor includes a stationary unit including a stator and a rotation unit including a magnet unit disposed radially outward of the stator and a cylindrical rotor holder. The magnet unit is held on a radially inside surface of the rotor holder. The magnet unit includes first magnets each of which has N and S poles magnetized in a radial direction, and second magnets each of which has N and S poles magnetized in a circumferential direction. Magnetic poles of radially inner end portions of the first magnets adjacent to each other in the circumferential direction via the second magnet are different from each other. Magnetic poles of circumferential end portions of the second magnets adjacent to each other in the circumferential direction via the first magnet are different from each other.

Abstract: The present disclosure provides a bearing assembly, a rotor assembly and a draught fan. The bearing assembly has a shaft sleeve and a shaft extending through the shaft sleeve. An inner wall of the shaft sleeve is provided with two grooves in a circumferential direction. The shaft is provided with two channels corresponding to the two grooves respectively. The channels and the grooves form two raceways. Multiple rolling bodies are disposed between the shaft and the shaft sleeve and movable in the raceways. The shaft sleeve has an outer diameter of 13 mm, and a portion of the shaft extending within the shaft sleeve has a diameter of 5 mm.

Abstract: Systems and methods of controlling a length of an air gap in an electric machine using an air gap controller may include: determining an air gap length value for an electric machine at least in part using an air gap controller, comparing the determined air gap length value to an air gap target value using the air gap controller, and outputting a control command from the air gap controller to a controllable device associated with an air gap control system when the determined air gap length value differs from the air gap target value by a predefined threshold. A control command may be configured to impart a change to an operating parameter associated with the air gap control system to adjust a length of an air gap between an outer surface of a rotor core and an inner surface of a stator core of the electric machine.

Abstract: A rotor includes a rotor core, permanent magnets, and a tubular non-magnetic cover. The permanent magnets are arranged along an outer surface of the rotor core in the circumferential direction. The permanent magnets each include a curved outer surface as viewed in the axial direction. The tubular non-magnetic cover covers the outer surfaces of the permanent magnets. The rotor core includes at least two stacked cores. Each stacked core includes a stack of core sheets. One of the stacked cores is formed from a material having a lower hardness than the other stacked core.

Abstract: Provided is a brushless direct currency (BLDC) motor and a manufacturing method thereof, and more particularly, a brushless direct currency (BLDC) motor including a rotor rotated to drive an impeller and capable of reducing a defective rate of the motor due to a rotational imbalance by controlling a shape of a magnet portion included in the rotor, and a manufacturing method thereof.

Abstract: A rotor for an electric machine includes a central hub with a cylindrical outer surface. A plurality of elongate spacers are affixed to the central hub at its outer surface. The spacers are circumferentially spaced apart from each other and extend axially along the outer surface of the central hub. A plurality of permanent magnets reside on the outer surface between the spacers. The magnets define at least two magnetic poles of the rotor. A metallic shield surrounds an outward facing surface of the permanent magnets and spacers to shield the magnets from high frequency magnetic fields that would cause eddy currents, and thus magnet heating. The metallic shield includes a metallic foil. A carbon fiber retaining sleeve surrounds an outward facing surface of the metallic shield. The carbon fiber sleeve is configured to retain the magnets to the central hub during operation of the electric machine.

Abstract: A rotor for an electric machine has a permanent magnet carrier that defines a plurality of permanent magnet receptacles. A plurality of permanent magnets are received in the receptacles. The magnets are arranged to define at least two magnetic poles of the rotor. A metallic shield surrounds an outward facing surface of the permanent magnets to shield the magnets from high frequency magnetic fields that would cause eddy currents, and thus magnet heating. The metallic shield is constructed from a metallic foil. A carbon fiber retaining sleeve surrounds an outward facing surface of the metallic shield. The carbon fiber sleeve is configured to retain the magnets to the permanent magnet carrier during operation of the electric machine. The permanent magnet carrier is interference fit over a rotor core.

Abstract: A permanent magnet rotating electric machine is provided with: a magnet portion comprising a plurality of permanent magnets forming a plurality of sets each of which is attached annularly and which are disposed along an axial direction of a rotor; and a plurality of anti-scattering rings press-fitted along the axial direction around the outer circumference of the magnet portion forming the plurality of sets. The anti-scattering rings each have: an insulation coating provided on both side surfaces contacting adjacent, other anti-scattering rings; a chamfer provided between the outer circumferential surface and one side surface; and an insulation coating provided on the chamfer.

Abstract: A rotor for an electrical machine is provided. The rotor comprises: a rotor body; one or more magnets arranged around the rotor body; and a non-magnetic containment sleeve positioned radially outwardly of the one or more magnets. The containment sleeve has axially-alternating solid ring sections and reticulated ring sections.

Abstract: A rotor of an inner-rotor motor includes a shaft having a connecting portion. A permanent magnet is mounted around the connecting portion of the shaft. The permanent magnet includes at least one first engaging portion. At least one coupling member includes a through-hole. The shaft extends through the through-hole. The at least one coupling member includes a second engaging portion engaged with the at least one first engaging portion of the permanent magnet.

Abstract: A rotor that includes a rotor core assembly secured to a shaft. The rotor core assembly includes a magnet and an end cap secured to an end of the magnet. Each of the magnet and the end cap has a bore into which the shaft extends. The end cap forms an interference fit with the shaft. The magnet forms a clearance fit with the shaft and an adhesive is located in the clearance between the magnet and the shaft. Additionally, a method of manufacturing the rotor. The method includes inserting the shaft into the bore of the end cap. An adhesive is then introduced into the bore of the magnet and the shaft is inserted into the bore of the magnet so as to cause adhesive to be drawn into the clearance defined between the magnet and the shaft.

Abstract: A rotor includes a rotary member, a plurality of permanent magnets disposed on an outer circumference of the rotary member, and a cover tube that is mounted to outer circumference of the permanent magnets to cover the permanent magnets, and is formed of a fiber reinforced plastic. At least one of the rotary member and the permanent magnets has a diameter enlarged portion having a diameter enlarged circumferential surface. The diameter enlarged portion has a diameter that enlarges from a first diameter region to a second diameter region. The first diameter region has a diameter equal to or less than an inner diameter of the cover tube. The second diameter region has a diameter equal to or more than an outer diameter of the permanent magnets.

Abstract: A rotating electric machine includes a rotor including a rotor core fixed to a shaft, respectively, an end plate provided between the rotor core and a front-side end plate for preventing scattering of a magnet, and an end plate formed in a bowl shape. A passage including a hole penetrating the rotor core and a hole connecting the shaft to the end plate and the bowl-shaped end plate is provided, liquid refrigerant is supplied through the passage, and the liquid refrigerant discharged from the passage is scattered by rotation along an inner peripheral surface of the bowl-shaped end plate so as to reach a space between a coil end surface of a stator and an end surface of an insulator supporting a coil of the stator.

Abstract: A method for reducing stress concentration on a rotor sleeve during balance cutting comprising: providing an axial protrusion to an outer diameter of a first end cap and a second end cap of a rotor assembly; and radially cutting at least one of the sleeve or the axial protrusion to balance the rotor assembly.

Abstract: The present invention provides a rotor with magnet protection mechanism comprising a core, a plurality of magnets and a magnet protection mechanism. The core comprises a plurality of slots in a radial arrangement, and the magnets are held within the slots. The magnet protection mechanism is set against the core and comprises a plurality of segments corresponding to the slots in a circular configuration.

Abstract: An electric motor may include: a stator; a rotor; and a tubular sleeve. The stator may have a stator cavity with an axis extending in a longitudinal direction. The stator cavity may have a stator inlet for receiving a fluid and a stator outlet for discharging the fluid. The rotor may be arranged inside the stator cavity and be rotatable around the axis. The tubular sleeve may be arranged between the stator and the rotor, coaxial with the axis, and attached to the stator through attachment members. The tubular sleeve may be spaced from the stator by a first tubular gap, and from the rotor by a second tubular gap. The first tubular gap may extend along the longitudinal direction between a first gap inlet and a first gap outlet. The second tubular gap may extend along the longitudinal direction between a second gap inlet and a second gap outlet.

Abstract: A rotor of a motor according to the present invention comprises: a shaft; a rotor core having a shaft insertion hole, into which the shaft is inserted and coupled; a magnet coupled to the outer peripheral surface of the rotor core; and a rotor cover comprising an upper cap and a lower cap, which cover the upper and lower portions of the rotor core and of the magnet, respectively, wherein the outer periphery of the rotor core comprises a first corner portion and a second corner portion, and the inner periphery of the magnet comprises a first inner peripheral portion, which corresponds to the first corner portion, and a second inner peripheral portion, which corresponds to the second corner portion.

Abstract: A rotor core assembly that includes a magnet, a first end cap located at an end of the magnet, a second end cap located at an opposite end of the magnet, and a sleeve that surrounds the magnet and the end caps. The sleeve forms an interference fit with each of the end caps, and an adhesive is located between the magnet and the sleeve. Additionally, a method of manufacturing the rotor core assembly.

Abstract: A bearing arrangement including a rotating part and a non-rotating part. The rotating part is configured to rotate relative to the non-rotating part with an essentially horizontal rotation axis. The arrangement is provided with an energy generating system, comprising at least one micro generator module. The micro generator module includes a housing, an eccentric mass mounted so as to be rotatable around an eccentric shaft in the housing, and a generator unit configured to generate electrical energy using the rotation of the eccentric shaft. The energy generating system is mounted to the rotating part of the arrangement.

Abstract: A permanent magnet for connecting with a connection device of an external rotor machine includes a north pole and a south pole as magnetic poles. A magnetic field runs from the south pole to the north pole, with a cross section of the permanent magnet having an envelope with a concave section. The envelope has, in the form of a sickle, the concave section and a convex section. The permanent magnet runs in an arcuate manner along the convex section, and the magnetic poles run in an arcuate manner along the concave section.

Abstract: A rotor includes a rotor core, permanent magnets, and a tubular non-magnetic cover. The permanent magnets are arranged along an outer surface of the rotor core in the circumferential direction. The permanent magnets each include a curved outer surface as viewed in the axial direction. The tubular non-magnetic cover covers the outer surfaces of the permanent magnets. The rotor core includes at least two stacked cores. Each stacked core includes a stack of core sheets. One of the stacked cores is formed from a material having a lower hardness than the other stacked core.

Abstract: A rotor manufacturing method for manufacturing a rotor including a rotor core, the rotor core having a permanent magnet mounted thereon throughout a circumferential direction, includes covering an outer circumference of the rotor core with a tubular rotor cover; and forming an angular portion conforming to an outer shape of the permanent magnet by pressing an open end of the rotor cover radially inward with use of a pressing member, the open end of the rotor cover axially projecting from an end of the rotor core before being pressed.

Abstract: A small and low-price rotating electric machine has a structure where a magnet end surface and a metal tube end are not in contact with each other. The rotating electric machine has a cylindrical stator core, a rotor having a shaft provided on the inner circumferential side of the stator core, a yoke fixed to the shaft, at least one ferrite magnet provided on the outer circumferential surface of the yoke, and a protective cover provided on the outer circumference of the ferrite magnet. The ferrite magnet end surface is projected with respect to an end surface of the yoke, and has a step portion to form a gap between the end surface of the ferrite magnet and a bottom surface of the protective cover.

Abstract: A rotor of a rotary machine includes a ring-like fixing member press-fit and fixed to a shaft so as to limit a position of a rotor core in a shaft axial direction and an end plate fixed to an outer peripheral side of the fixing member so as to limit a position of a magnet, embedded in the rotor core, in the shaft axial direction. Influences of a difference in thermal expansion between the shaft and the end plate are lessened by the fixing member. A material is selected so that a value of a coefficient of linear expansion of the fixing member becomes equal to an intermediate value between a coefficient of linear expansion of the shaft made of iron and a coefficient of linear expansion of the end plate made of a non-magnetic body.

Abstract: A fixing structure for a permanent magnet includes: a cylindrical housing; a permanent magnet housed inside the housing; and an adhesive layer formed in a gap G between the housing and the permanent magnet and having an adhesive for fixing the permanent magnet to the housing. The adhesive layer is formed such that a filling rate of the adhesive is higher in the gap at another axial end of the permanent magnet than at one axial end of the permanent magnet. The permanent magnet is configured such that a density at said other axial end is higher than the density at said one axial end.

Abstract: To provide a rotor member, rotor, and electric motor equipped with the same, which suppress the stress or stretching concentrated on a part of a cylindrical member, thereby enabling to raise the maximum revolution speed, and enabling greater torque to be obtained. In a rotor member fixed by press-fitting to a rotary shaft part of a rotating electrical machine, a thrust member that thrusts a cylindrical member to an outer side in the radial direction against a sleeve part is present between a plurality of magnet segments which are adjacent in the circumferential direction.

Abstract: A permanent magnet motor is provided in which, in flanges each provided in a plurality of teeth, lateral side portions of the flanges oppose to lateral side portions the flanges being provided in adjacent teeth and protruding in a circumferential direction of a stator core; when a height in the lateral side portion of the flanges in a radial direction of the stator core is defined as “h,” and the length of a magnetic air gap is defined as “g,” the relationship “1?h/g?2” is held; and also, when a circumferential distance between opposing faces of the flanges being adjacent to each other is defined as “a,” the relationship “a/g?0.2” is satisfied.

Abstract: An electric motor rotor includes a substantially cylindrical body, which conducts a magnetic field, and defines at least one housing receiving a group of magnets that includes at least two permanent magnets. Two circumferentially adjacent magnets of the housing are separated from one another by an air knife.

Abstract: A stator and a rotor are mounted inside a case of a permanent magnet motor, and separate the inner cavity of the case into a first inner cavity and a second inner cavity. An air gap is formed between an inner circle surface of the stator and an outer circle surface of the rotor. Axial ventilation holes in communication with the first inner cavity and with the second inner cavity are disposed in teeth of a stator core. The rotor comprises a rotor core and rotor pressing rings disposed in an axial direction at both sides of the rotor core. A partition is disposed between the rotor core and at least one of the rotor pressing rings. An outer edge of the partition extends into the air gap, thus enhancing the air blocking effect and realizing a higher cooling efficiency.

Abstract: In a rotating electrical machine, in the case where a cylindrical component is fixed by press fitting or the like, the opening edge of the cylindrical component is widened toward the end to provide peeps for facilitating the insertion of the cylindrical component. However, the outer shape of a rotor expands due to the peeps, and a gap needs to be provided between the rotor and a stator in consideration of the expanded portion of the outer shape, which causes the degradation of the performance of the rotating electrical machine. In addition, in the case where magnets are fixed only by the tightening force of a magnet cover, the greater the centrifugal force becomes, the larger the clamping margin becomes and similarly the larger the peeps become, and thus the expanded portion also becomes larger. However, if the opening edge is not widened to the end, the absence of the peeps makes it difficult to insert the magnet cover.

Abstract: An apparatus 10 for the contactless measurement of a rotation angle 15 is described. A permanent magnet 60 having a number of poles, wherein the number of poles amounts to four or more and cannot be divided by three, is mounted on the front of an axle. In a plane below the permanent magnet 16 at least three first lateral Hall sensors 40a-c are located in a circular path 50. A method for calculation the rotation angle 15 with the aid of the lateral Hall sensors 40a-40c is also described.

Abstract: A method for coupling a permanent magnet to a rotor body of an electric motor includes providing a rotor body having an outer surface. A mounting hole is formed in the rotor body. A permanent magnet in the form of an annular section is provided. The concave surface of the permanent magnet has a diameter generally equal to the outer diameter of the rotor body. The permanent magnet has a hole formed therein to receive the threaded connector, the hole having a countersink at the convex surface of the permanent magnet. The permanent magnet is positioned on the outer surface of the rotor body such that the hole lines up with the mounting hole, an elastomeric body is positioned in the countersink, and the threaded connector is positioned through the elastomeric body and the hole of the permanent magnet to couple to the rotor body.

Abstract: A permanent magnet motor, including: a stator assembly and a rotor assembly. The stator assembly includes: a stator core and a coil winding. The stator core includes: a yoke portion, a plurality of tooth portions, and a plurality of winding slots. The rotor assembly includes: a rotor core, a plurality of permanent magnets, and a rotor sheath. The tooth portions are extended out of the yoke portion. Each winding slot is formed between adjacent tooth portions. The permanent magnets are disposed at intervals on a surface of the rotor core and magnetic poles of two facing sides of adjacent permanent magnets are the same. The rotor sheath is disposed outside the rotor assembly and is divided into at least two segments axially. A magnetic conductivity of a first segment of the rotor sheath is different from a magnetic conductivity of a second segment of the rotor sheath.

Abstract: A permanent magnet rotor shaft assembly for a high speed electrical machine provides a permanent magnet cylindrical core having a longitudinal axis, the cylindrical core being axially compressed by first and second end shafts and being radially compressed by a sleeve made of a non-magnetic high strength metal. At least one of the first and second end shafts includes, facing the cylindrical core, a central shoulder head that cooperates with a mating central recess made in a central portion of a front face of the cylindrical core. An easy concentric alignment of the first and second end shafts with the permanent magnet cylindrical core is allowed while inserting the sleeve and the stiffness of the assembled set is enhanced.