Abstract: Methods and systems are provided for providing cooling to an electric motor via direct spray cooling. In one example, a system may include a shaft including an oil conduit extending axially therein and a plurality of openings fluidically coupling the oil conduit to an external surface of the shaft; a rotor positioned coaxial with the shaft, an inner diameter of the rotor greater than an outer diameter of the shaft; and a gas-filled chamber bounded by an inner surface of the rotor and the external surface of the shaft, the gas filled chamber fluidically coupled to the oil conduit via the plurality of openings, and a pressure of a gas in the gas-filled chamber lower than a pressure of oil in the oil conduit.

Abstract: A manual power pack assembly for an electric power steering (EPS) system includes a motor housing at least partially enclosing a motor and having an outer diameter. The manual power pack assembly also includes a connector plate formed of a material comprising plastic, the connector plate having a first side, a second side, and a cylinder extending from the first side. The manual power pack further includes a metal ring disposed on an inner diameter of the cylinder and in contact with the outer diameter of the motor housing.

Abstract: A blood pump rotor for an intravascular blood pump includes a distal portion having a rotor hub. A distal end of the rotor hub extends beyond a most distal portion of at least one blade formed on the hub. A proximal portion comprises permanent magnets arranged to form a modified Halbach array generating a magnetic field with a first magnetic flux in a proximal direction that is greater than a second magnetic flux in the distal direction. The array is arranged so that: (a) at least one axial magnetized magnet has a most proximal point that is a different distance from said distal end as compared to a most proximal point of at least one circumferential magnetized magnet, (b) at least one axial magnetized magnet has a physical dimension that is different from a corresponding physical dimension of at least one circumferential magnetized magnet, or (c) a combination thereof.

Abstract: With an electric compressor including a rotational shaft, a compressor wheel disposed on the rotational shaft, and an electric motor for applying a rotational force to the rotational shaft including a rotor fixed to the rotational shaft, and a stator disposed around the rotor, for applying the rotational force to the rotor by an electromagnetic force, a vibration/noise reduction device includes a detector for detecting a frequency related to a vibration of the stator, and a signal generator for generating a vibration signal that has a frequency of a predetermined integral multiple of an electrical angle frequency, which is obtained from the frequency detected by the detector, and has a signal wave attenuating the vibration of the stator, and a vibrator for vibrating the electric compressor based on the vibration signal.

Abstract: A motor-pump system includes a first housing part, a hydraulic pump, an electric motor, and a sensor board. The hydraulic pump includes an outer gerotor rotationally supported on the first housing part and an inner gerotor rotationally supported on the first housing part. The electric motor includes a stator assembly rotationally fixed in the first housing part and a rotor assembly with a non-ferrous sensor target, fixed to the outer gerotor. The sensor board includes a plurality of sensor traces for inductively sensing a signal from the non-ferrous sensor target when the outer gerotor is rotated.

Abstract: An electric compressor includes a cylindrical motor housing, an inverter case, and a conductive member. The inverter case is joined to an end portion of the motor housing. The inverter case includes a cylindrical case peripheral wall surrounding the end portion. The end portion has an end face that extends in a radial direction of the motor housing and a peripheral surface that extends in an axial direction of the motor housing and is connected to the end face. A ring-shaped sealing member is disposed between the peripheral surface and the case peripheral wall. An accommodation groove for accommodating the sealing member is recessed in the peripheral surface. The sealing member is held by the peripheral surface and the case peripheral wall in a radial direction of the sealing member to seal a space in which the conductive member is disposed.

Abstract: A blower may include a fan, a casing including a discharge port and housing the fan, and a nozzle attachable to the discharge port. The nozzle may include a nozzle tube in which air flows, and a plate member disposed within the nozzle tube. A rear end surface of the plate member may be inclined to a flow direction in which air flows within the nozzle tube.

Abstract: Disclosed herein is a user interface that can be universally mounted to a combination variable speed pump and a drive assembly therefor. The user interface is universally configured to be selectively mounted to the drive assembly and/or to an environmental surface that is remotely located from the drive assembly. The user interface is universally configured to be selectively mounted to the drive assembly in any one of a plurality of available positions relative thereto.

Abstract: Electric multiple stage variable forced air induction systems are disclosed herein. A housing defines a conduit therethrough with an exit (output) opening and an entry (intake) opening. The exit opening is to couple to and provide airflow to an air intake opening of a combustion engine. The entry opening is to receive air for delivery through the conduit to the exit opening. A plurality of stages generate thrust to increase airflow through the conduit and to the air intake opening of the combustion engine. Each stage can comprise a turbine housing component, a turbine rotor to rotate about an axis and generate thrust on air as it passes through the conduit in a direction parallel to the axis, and a motor coupled to and configured to turn the turbine rotor. One or more processing devices receive inputs indicating engine parameters and control the motor of each stage.

Abstract: A ceiling fan assembly including a stator assembly having a non-rotating motor shaft and stator slidably and non-rotationally coupled to the non-rotating motor shaft, a rotor assembly, a first bearing slidably mounted to the non-rotating motor shaft and rotatably coupling the rotor assembly to the stator assembly, and a first spacer located between the first bearing and the stator assembly to fix the sliding location of the first bearing relative to the stator along the non-rotating motor shaft.

Abstract: An electric compressor has an electric motor housed in a casing and that drives a compression part for compressing a refrigerant guided into the casing, and a connecting part accommodating container in which an external power line is guided from an exterior of the casing, and accommodating a connecting part for electrically connecting the external power line that supplies power to the electric motor and an internal power line guided from the electric motor. An insertion hole through which the internal power line is inserted is provided to the connecting part container; the connecting part container can be split with a splitting line for splitting the connecting part container and splitting the insertion hole; a first rubber ring for blocking off the insertion hole in a liquid-tight state is disposed inside the connecting part container; and the first rubber ring is sandwiched between split walls forming the insertion hole.

Abstract: A motor device includes a motor body having a stator and a rotor, and an EDU for controlling the motor body. A hydro unit is disposed between the motor body and the EDU (Electric Driver Unit). In the motor body, a plurality of terminal lines for energizing the coil of the stator and the EDU is drawn around, and a rotation detection unit for detecting the rotation of the rotor is provided a space formed between the plurality of drawn terminal lines and the rotation shaft of the motor.

Abstract: A motor-driven compressor includes a compression mechanism, an electric motor, an inverter, a housing, and a cover defining an accommodation chamber with the housing to accommodate the inverter. The cover includes a plate-shaped body wall and insertion holes extending through a periphery of the body wall. The body wall includes a first surface opposed to the inverter in the accommodation chamber, a second surface, a first thickness portion having a first thickness, and a second thickness portion located around at least one of the insertion holes. The second thickness portion has a second thickness that is smaller than the first thickness and is obtained by recessing the body wall from the first surface toward the second surface.

Abstract: A power-driven working device including: a working tool; a drive unit configured to drive the working tool; a control unit configured to control an output power of the drive unit; and an operating unit including a first switch and a second switch, is provided. The control unit includes a cruise control unit configured to execute cruise control to maintain the output power of the drive unit constant when a cruise switch is activated, and an output power adjustment unit configured to increase the output power of the drive unit and to continue the cruise control when the first switch is activated during the cruise control, and to decrease the output power of the drive unit and to continue the cruise control when the second switch is activated during the cruise control.

Abstract: Disclosed is a yoke-less mover of a homopolar linear synchronous machine. The yoke-less mover may include a cold plate having slots. Ferromagnetic cores are fixed to the cold plate. Each of the ferromagnetic cores may protrude through a respective one of the slots, creating gaps between the ferromagnetic cores. Armature windings are fixed to the cold plate. The armature windings may occupy the gaps between the ferromagnetic cores. The ferromagnetic cores of the yoke-less mover have better ferromagnetic utilization and lower weight. It also enables more flexible topologies in the armature windings.

Abstract: In a rotary electric machine, slots are formed between teeth of a stator core. A ratio of a number of poles to a number of slots is 2:3. When an electrical angle of a tooth tip width, which is a width dimension of a tip of each of the teeth in a circumferential direction of the stator, is represented by ?, an electrical angle of a pole arc angle, which is an angle formed by two straight lines that connect a rotation center of a rotor to corners on a rotor surface side of one permanent magnet, is represented by ?, and a number of pole pairs is represented by P, the tooth tip width is within a range of (electrical angle)±0.2°×P for a value that satisfies the following expression: ?=?2.5?+319.7 (0<??180) [deg].

Abstract: A compressor includes a first scroll and a second scroll engaged with the first scroll for performing an orbiting motion relative to the first scroll to form a compression chamber along with the first scroll. A stator is disposed at one side of the second scroll and includes a stator core. A rotor is rotatably disposed inside the stator core, and includes a rotor core. A rotary shaft has one end portion eccentrically coupled to the second scroll and the other end portion coupled to the rotor core. The rotor core is formed with at least one space portion axially recessed into the rotor core.

Abstract: The present disclosure relates to a compressor including: a motor configured to generate a driving force; a compression mechanism configured to be driven by the motor to compress a refrigerant; an inverter configured to control the motor; a connector configured to electrically connect the motor and the inverter to each other; and a sealing member configured to seal a connection portion between a terminal of the motor electrically connected to the connector and the connector. Therefore, the refrigerant may be prevented from being introduced into the motor terminal and a short circuit may be prevented from occurring in the motor terminal.

Abstract: Provided is a turbo compressor for compressing a gas such as air and supplying the compressed gas to outside, the turbo compressor including a compression gas inlet for sucking the gas, a first impeller, a second impeller, a compression gas outlet for discharging to outside, a compression unit including compression gas channels connected from the compression gas inlet to the compression gas outlet, a motor to rotate the first and second impellers, and including a rotary shaft, a housing including a motor accommodation space, and an intercooler including air-cooling channels provided on the compression gas channels located between the first and second impellers, wherein the air-cooling channels penetrate through and are hidden in the housing. According to the present invention, the turbo compressor's size may be reduced by integration of the intercooler and the housing, and damage of the intercooler due to external impact may be prevented.

Abstract: A centrifugal fluid pump with a fully magnetically suspended rotor to improve blood compatibility when pumping blood is disclosed. The pump stabilizes radial displacements of a disc-like rotor with active control through separate electric motor and magnetic bearings to improve the pump's critical performances including device packaging size, system simplicity and reliability, stiffness and other dynamic performances of suspension, power efficiency, and others.

Abstract: An airflow control system of a work vehicle includes a controller having a memory and a processor. During an initialization phase, the controller is configured to instruct a blower to operate at an initialization capacity to provide an airflow from an external environment into an interior of a cab of the work vehicle. The controller is also configured to receive a first signal indicative of a pressure within the interior of the cab and to determine a restriction factor based at least in part on the first signal. In addition, during an operation phase, the controller is configured to receive a second signal indicative of the pressure within the interior of the cab and to determine an input flow rate of the airflow from the external environment into the interior of the cab based at least in part on the restriction factor and the second signal.

Abstract: A water pump includes: an upper housing formed with an inlet and an outlet of fluid; a lower housing installed to fit in a lower side of the upper housing, having a receiving space formed therein; a shaft fixing support having a lower part of a protrudedly formed shaft inserted in the center of a bottom part of the lower housing; an impeller installed around the shaft; a rotor configured by having a magnet installed around a rotor core; a stator installed inside the lower housing; a lower cover; a shaft upper part fixing support member installed in an upper side of the shaft erectedly inserted in the shaft fixing support; and a synthetic resin mold member formed with a first synthetic resin mold around an outer side of the shaft fixing support and around the shaft, and a second synthetic resin mold around an outer side of the rotor.

Abstract: The present disclosure relates to a stator assembly of a magnetic suspension bearing and a manufacturing method, wherein the stator assembly includes stator cores, coils and two stator core frames, two of the stator core frames being respectively engaged at both ends of the stator core along an axial direction thereof, wherein a concave portion is provided at an engaged end of one of the stator core frames, and a convex portion is provided at an engaged end of the other of the stator core frames, the concave portion and the convex portion are engaged with each other, and each of the coils is wound correspondingly to teeth of the stator cores.

Abstract: A fluid pump includes a fluid pump inlet and a fluid pump outlet. A motor includes an armature and a stator such that the armature rotates about an axis. A pump section includes a pump section having a pumping element coupled to the armature such that rotation of the armature rotates the pumping element such that the pumping element pumps fluid from the fluid inlet to a pump section outlet of the pump section. A fluid passage within the fluid pump provides fluid communication from the pump section outlet to the fluid pump outlet such that the fluid passage is radially between the armature and the stator. The armature includes a surface of which faces toward the pump section and includes a plurality of recesses extending thereinto.

Abstract: An electric fuel pump includes a housing having an oil inlet and an oil outlet, an impeller, a stator unit mounted in the housing and including a stator and a starter terminal set connected to the stator, a packaging adhesive encapsulating the stator and the starter terminal set to create an oil guide passage in communication between the oil inlet and the oil outlet, and a rotor unit mounted in the housing and including a rotor rotatably mounted in the stator and a rotating shaft mounted in the rotor and connected with the impeller. When the stator unit is electrically conducted, the rotor unit drives the impeller to draw a fuel oil into the oil guide passage. When the fuel oil goes through the oil guide passage, the stator and the starter terminal set are well protected by the packaging adhesive and prohibited from contacting the fuel oil.

Abstract: A blower assembly includes a centrifugal fan and a motor assembly. The centrifugal fan has a plurality of axially extending impeller blades, a first axial end, and an air inlet. The air inlet is at the first axial end of the centrifugal fan. The motor assembly comprises a stator, a rotor, and an air directing surface. The air directing surface is shaped and configured to direct air drawn into the air inlet radially outwardly toward the impeller blades. The air directing surface extends generally along the rotor axis from its first end to its second end. At least a surface region of the air directing surface generally circumscribes the rotor axis and diverges radially outwardly as such surface region of the air directing surface extends away from the first end toward the second end.

Abstract: A pump assembly for a dishwashing appliance includes an inner diffuser shell defining a motor housing and an outer diffuser shell spaced apart from the inner diffuser shell to define a diffusing plenum. A motor positioned within the motor housing rotates a wash pump impeller and urges a flow of wash fluid through the diffusing plenum. Within the diffusing plenum, guide vanes extend between the inner diffuser shell and the outer diffuser shell to diffuse and direct the flow of wash fluid.

Abstract: Partitioned chambers of an electric connector, which receive connection terminals electrically connected to windings of a stator, are communicated with an outside of the electric connector through primary communication holes. The primary communication holes are formed to direct at least one of perpendicular directions, each of which is perpendicular to a corresponding one of opening planes of outside openings of the primary communication holes, toward a downside when a central axis of a fuel pump is tilted relative to a vertical direction. In this way, a foreign object, which is accumulated in any of the portioned chambers, can be outputted to the outside through the primary communication hole even when the fuel pump is tilted in any direction.

Abstract: A cooling fan with shapes, sizes, and placements of frame and supporting ribs tuned to reduce operational vibration and noise includes a fan frame, a supporting base, and a plurality of ribs. The fan frame includes a bottom plate and a sidewall connected to the bottom plate. The supporting base is formed at the bottom plate. The plurality of ribs extends from an outer circumferential surface of the supporting base to the sidewall. At least one of the plurality of ribs and the fan frame is asymmetrical with respect to the supporting base.

Abstract: Disclosed is a rotary pump including a magnetic rotor arranged in a pump housing and having a magnetic rotor plane, which rotor is operatively connected to a drive for conveying a fluid. The drive is a bearingless motor having a stator configured as a bearing stator and drive stator and having a magnetic stator plane, wherein the stator bears a drive coil and a bearing coil lying in the stator plane and/or a drive bearing coil. The rotor is magnetically contactlessly journalled within the stator, wherein an axial height (H) of the rotor is smaller than or equal to half a diameter (D) of the rotor so that the rotor is passively magnetically stabilized by reluctance forces with respect to the magnetic stator plane both against axial displacement and against a tilt from an equilibrium position.

Abstract: A medical handle comprises a drive unit and a control device or circuit for driving a medical tool. The control device or circuit comprises a control and/or regulating circuit for controlling and/or regulating the drive unit, the drive unit comprises at least one magnetic element and a sensor system for determining the alignment of the at least one magnetic element. To achieve simpler assembly and a greater resistance to the ambient conditions that prevail during sterilization in comparison with known handles, the sensor system and the control and/or regulating circuit are combined in a joint control module, and the at least one magnetic element is arranged in the medical handle in such a way that at least a part of the control module can be positioned in the immediate vicinity of the at least one magnetic element and that the sensor system is arranged in the control module in such a way that it can be positioned in the immediate vicinity of the at least one magnetic element.

Abstract: In one embodiment a blower comprises a case comprising a first surface, a second surface opposite the first surface, and a side wall extending between portions of the first surface and the second surface, wherein the side wall comprises an air inlet and an air outlet, an impeller disposed in the case and rotatable about an axis of rotation extending between the first surface and the second surface. Portions of the side wall are disposed at least a first distance from the axis of rotation and the impeller is to define a circumferential airflow path within the case, and the impeller is to create an airflow in the circumferential airflow path between the air inlet and the air outlet.

Abstract: A centrifugal blower apparatus includes a scroll-shaped housing with first and second air inlets which open to a blower chamber that is in fluid communication with an air outlet. The blower includes a motor to drive an impeller, wherein the motor is secured to a frame that is coupled with the housing in a manner to substantially enhance aerodynamic performance of the blower.

Abstract: A bearing cooling structure includes a metal base seat and a plastic bearing cup. The metal base seat has a raised section and an extension section. The plastic bearing cup encloses the raised section and has an inner circumference defining a bearing hole. The extension section horizontally extends from the raised section toward a center of the plastic bearing cup. The extension section has a free end and an upper surface positioned in the bearing hole. A bearing is received in the bearing hole and disposed on the extension section. A bottom face of the bearing is in contact with the upper surface of the extension section. Accordingly, the heat of the bearing can be transferred (conducted) through the extension section to the metal base seat to be dissipated. A fan with the bearing cooling structure is also disclosed.

Abstract: A thin-profile cross-flow fan with air volume gain effect has a thin-profile casing, a cross-flow guide passage, a blade assembly, an auxiliary guide ring portion, an axial magnetic motor and a radial flow-through auxiliary guide portion. When the thin-profile cross-flow fan is operated, the air stream guided from the air inlet can be guided to the air outlet through the circulation space or the auxiliary guide ring portion and radial flow-through the auxiliary guide portion, thus increasing the an flux and volume of the thin-profile cross-flow fan and also improving greatly its gain effect and performance with better applicability and industrial benefits.

Abstract: An impeller includes a metal base plate, a shaft and a plurality of plastic blades. The metal base plate includes a shaft-coupling portion, a peripheral portion, and first and second surfaces. The first surface faces away from the second surface in a first direction, and the second surface faces away from the first surface in a second direction. The metal base plate is flat between the shaft-coupling portion and the peripheral portion. The first surface has a permanent magnet. The shaft has a fixing end coupled with the shaft-coupling portion, as well as a free end extending axially in the first direction. Each plastic blade has a coupling portion coupled with the peripheral portion, as well as an air-driving portion axially extending in the second direction. The impeller may be rotatably coupled with a driving module. The driving module is installed in a fan frame to form an advection fan.

Abstract: An electric compressor includes an inverter cover. The inverter cover has a metal plate that is arranged to cover an inverter (a circuit board). The metal plate has bolt insertion holes, through which metal bolts for fixing the inverter cover to a suction housing are passed. The head of each bolt contacts a flange portion, which is the periphery of the corresponding bolt insertion hole. The inverter cover is formed of plastic by being molded in a mold, using the metal plate as a core.

Abstract: A bearing assembly for use in a deepwell submersible pump, the pump and a method of pumping a geothermal fluid. The bearing assembly is constructed to include a lubricant conveying mechanism, a bearing sleeve and a multilayer bushing. The lubricant is forced between the bushing and a bearing sleeve by the lubricant conveying mechanism that cooperates with the rotation of a shaft used to connect a power-providing motor with one or more pump impellers. In this way, there exists a substantially continuous lubricant environment between the sleeve and bushing to act in a hydrodynamic fashion.

Abstract: The internal-driven compressor having a powered compressor rotor. The internal-driven compressor includes a compressor housing including a suction port and a discharge port, an internal driver including a rotor and a stator, the rotor and the stator located within the compressor housing, the stator located radially inward of the rotor, and a powered compressor rotor including an annular body extending about a center axis, wherein the rotor is fixed to the powered compressor rotor and configured to rotate the powered compressor rotor about the center axis in response to a force imparted by the stator.

Abstract: A fluid pump includes a hollow housing, an electric motor having an armature with a commutator, a pump section rotationally coupled to the electric motor for receiving fuel at a relatively low pressure through a fuel inlet and pressurizing the fuel to a relatively high pressure, a motor brush is in electrical contact with the commutator and including a shunt wire extending therefrom, and an end cap that closes one end of the housing and defines a high pressure chamber with the housing. The end cap includes a hollow brush tower extending therefrom and defining a brush holder slidably receiving the motor brush therein such that the brush holder defines in part the high pressure chamber. The end cap also includes an aperture with the shunt wire extending therethrough such that the shunt wire is sealed with the aperture to prevent the fuel from passing therethrough.

Abstract: A fan motor set locating structure includes a base seat and a motor set. The base seat has a bearing cup. At least one locating notch is formed on a top section of the bearing cup. A bearing is disposed in the bearing cup. The motor set includes an insulation support. One side of the insulation support is formed with a sleeve. The sleeve is capped on the bearing cup. The sleeve has at least one protrusion section protruding from the sleeve to the bearing cup corresponding to the locating notch. The protrusion section is engaged in the locating notch in abutment with the bearing. Accordingly, the motor set can be quickly fixedly assembled with the bearing cup to fix the bearing. Therefore, the number of the components is decreased and the assembling process is speeded.

Abstract: A rotor unit for a brushless direct current motor (BLDC motor) comprises a main body integrally formed with a rotor shaft and an annular ring magnet mounted on the main body. The annular magnet comprises an anisotropic hard ferrite and is laterally magnetized. The rotary shaft and the main body of the rotor unit may be formed from one plastic material. The rotor unit is supported within the BLDC motor via self-lubricating bearing seats.

Abstract: Embodiments of the invention provide a pump assembly and a method for assembly the pump assembly. The pump assembly includes a stator assembly, a lower pump housing, an upper pump housing, a rotor assembly, and an isolation cup. The method includes coupling the stator assembly to the lower pump housing, overmolding an overmold material over the stator assembly and the lower pump housing, positioning the isolation cup over the overmold, and positioning the rotor assembly inside the isolation cup. The method further includes placing the upper pump housing over the rotor assembly and coupling the upper pump housing to the lower pump housing.

Abstract: A counterweight cover for a compressor is provided and may include an annular body having a recess at least partially defined by an outer circumferential portion, an inner circumferential portion, and an upper portion connecting the outer circumferential portion and the inner circumferential portion. A suction baffle may be disposed on the annular body and may direct a flow of suction gas within the compressor.

Abstract: A mixed-flow fan features a housing (42); an impeller (43) journaled rotatably with respect to the housing, and equipped with fan blades (54); a generally cylindrical air conduit (50) defined between the fan housing and the impeller, the fan blades extending into the air conduit in order, during operation, to transport air; an external-rotor motor (75) having an internal stator (100) and an external rotor (81) which includes a tubular ferromagnetic yoke (63) partly embedded in material of the impeller. A cup-shaped yoke (72) fits into a central cavity (68) of the tubular yoke (63) and accommodates a permanent magnet arrangement (66) which interacts with the stator. The tubular yoke (63) and the cup-shaped yoke (72) together serve as a magnetic return path for the external-rotor motor. The structure minimizes damage during final assembly, and simplifies insertion of balancing weights.

Abstract: An impeller of an advection-type fan includes a metal base plate, a shaft and a plurality of plastic blades. The metal base plate includes a shaft-coupling portion and a peripheral portion, with a first plane facing in a first direction and a second plane facing in a second direction opposite to the first direction arranged between the shaft-coupling portion and the peripheral portion. The metal base plate is in a plane form between the shaft-coupling portion and the peripheral portion. The shaft has a fixing end and a free end. The fixing end is coupled with the shaft-coupling portion, and the free end extends in the first direction. Each plastic blade has a coupling portion and an air-driving portion. The coupling portion is coupled with the peripheral portion, and the air-driving portion extends in the second direction.

Abstract: A resin magnet, a magnetic pole position detection resin magnet, and a sleeve bearing, which is disposed inside the resin magnet, are integrally molded together with a thermoplastic resin in a rotor portion. At the same time, an impeller attachment portion is formed by the thermoplastic resin.

Abstract: An inner-rotor fan includes a hub, a retaining tube, and a magnetic ring. The retaining tube is disposed in the hub, and the magnetic ring is disposed on the retaining tube. The retaining tube and the hub are formed as a single piece, and thus the stability of the fan is increased. Moreover, the magnetic flux in an inner hole of the magnetic ring is about 0 Wb, and thus an iron ring within the magnetic ring may be excluded.

Abstract: In a rotor portion, a magnet formed in a cylindrical shape, a first magnet holder that holds an impeller-attachment-portion-side end portion of the magnet, a second magnet holder that holds a magnetic-pole-position-detection-element-side end portion of the magnet, a back yoke disposed inside the magnet, a sleeve bearing disposed inside the back yoke, and a position detection magnet that is provided on a surface of the second magnet holder at a side opposite to the side at which the magnet is attached and allows a magnetic flux of the position detection magnet to be detected by the magnetic-pole-position detection element are assembled integrally together with a thermoplastic resin, and the impeller attachment portion is formed of the thermoplastic resin.

Abstract: A sealed compressor includes a centrifugal impeller above a rotor to synchronously rotate. A refrigerant rises through a rotor air hole, flows in an upper space, and flows out from a discharge pipe. The centrifugal impeller includes an oil separation plate on the rotor, and plural vanes standing on the oil separation plate, and forms inter-vane flow passages between adjacent vanes, and a vane inner flow passage that guides refrigerant from the rotor air hole to inner entrances of the inter-vane flow passages. Outer exits of the inter-vane flow passages are disposed along an entire circumference, and refrigerant increased in pressure while passing through the inter-vane flow passages flows out from the outer exits to the upper space. The oil separation plate closes a short-circuit passage through which the refrigerant directly flows from the vane inner flow passages to the discharge pipe without passing through the inter-vane flow passages.