Abstract: A dynamoelectric machine main body that includes: a housing that is constituted by a rear bracket and a front bracket; a rotor; a stator; and a fan, and a power supply unit that is mounted integrally onto the dynamoelectric machine main body are included, the power supply unit is disposed between the fan and a bottom portion of the rear bracket, and the power supply unit is disposed between the fan and a bottom portion of the rear bracket, and the rear bracket has: air discharge ports that are formed on portions that are positioned radially outside the fan; and air suction ports that have openings nearer to a bottom portion than the power supply unit, and includes a partitioning member for configuring a ventilation channel that extends from the air suction ports to the air discharge ports that is disposed between the power supply unit and the fan.

Abstract: A high speed electric motor for use in a variety of applications. The electric motor an electric motor including a motor housing or stator, a rotor having a commutator and brushes for contacting the commutator at a predefined area known as the contact area. Additionally, the motor includes a forced air cooling assembly. The forced air cooling assembly includes a centrifugal fan for creating air flow, a manifold for accelerating the air flow. The manifold having exit ports and the exit ports being positioned directly over the contact area for directing the accelerated air flow at the contact area and the motor housing having at least one opening aligned with the contact area and at least a second opening defining an exit vent. Additionally, a method of cooling the motor in accordance with the invention is also disclosed.

Abstract: A device for rectifying the current of a rotary electric machine comprising a bearing (50) with through openings (51) for a coolant, that comprises at least one module (100) including a holder (10, 16) for holding current rectifying members (93, 94) having the same phase as the machine, said holder (10, 16) including a heat sink (16) with vanes (18) at least partially covering an opening (51) in the bearing (50). A rotary electric machine including such a current rectifying device. Application: alternators of automotive vehicles with internal ventilation.

Abstract: A rotor arrangement for an electric machine comprises a rotor shaft and a rotor segment coupled to the rotor shaft. The rotor segment includes a main body and a collar integral with the main body. The collar includes an outer peripheral groove adjacent to the main body portion of the rotor segment. The rotor arrangement further includes a cooling fan that has a center opening defined by an inner perimeter. The center opening of the fan is configured to slidably engage the collar and is adjustable between an insertion diameter and a locking diameter. When the center opening is at the locking diameter, at least a portion of the inner perimeter of the fan extends into the outer peripheral groove in the collar such that the fan is retained on the rotor segment.

Abstract: Electrical machine rotors (R) suited for synchronous motors of electric vehicle drives. A rotor (R) includes a rotor shaft (8), a sheet stack (3), windings, and a restraining system (2) with support elements. The support elements of the restraining system include support rings (7) to protect winding heads (4) projecting from the sheet stack (3) in the axial direction against radial stresses. The elements of the restraining system (2) protecting the winding heads (4) from stresses also include axially inner end caps (6) configured as supports for the finished winding heads (4) in the operating state, and as guides and supports during the winding of the pole windings of the rotor (R) about the axial edge of the sheet stack (3). The axially outer support rings (7) cooperate with the axially inner end caps (6) so that the support rings (7) may absorb centrifugal forces acting on winding heads (4) end caps (6).

Abstract: For providing a permanent magnet type generator that has a limited inside temperature rise gradient even if the capacity thereof is increased and permits to reduce the size thereof, the present invention provides a ventilation means that increases the inner gas (air or cooling wind) quantity that is caused circulated via the heat exchanger causing to flow outer air is increased more at a region facing the outer air exhaust side in the heat exchanger than at the outer air inlet side.

Abstract: A power tool has a casing and a motor assembly installed in the casing. The motor assembly comprises a motor and a heat dissipation device. The motor comprises a housing and magnets or windings disposed at an inner surface of the housing. The heat dissipation device is arranged at an outer surface of the housing and a window is formed in the casing to expose the heat dissipation device. Preferably, the heat dissipation device comprises an annular heat absorbing section fitted to a radially outer surface of the motor housing and a plurality of fins extending from the heat absorbing section and into the window.

Abstract: In an axial fan including a motor, a substrate that connects the ends of a plurality of coils is disposed at a position axially under the bottom portion of a case with an axial gap therebetween. A spacer is interposed between the substrate and the bottom portion, and the substrate is fixed to the spacer. A plurality of through holes provided in the bottom portion are disposed in axial alignment with a plurality of through holes provided in the spacer. An air flow produced by rotation of an impeller at least partially passes through the interior of the case to be discharged to the outside of the case through the through holes in the bottom portion and in the spacer so that heat generated inside the motor can be efficiently transferred to the outside of the case.

Abstract: A motor includes a shaft that extends along a rotational axis and an end frame that includes a first surface that is substantially normal to the axis. A first plurality of annular features are arranged concentrically about the rotational axis and coupled to the first surface. A fan is mounted to the rotating shaft and including a slinger portion and a second surface. A second plurality of annular features are arranged concentrically about the rotational axis and coupled to the second surface. The first plurality of annular features cooperate with the second plurality of annular features to form a non-contact seal between the fan and the end frame.

Abstract: An electric machine includes a casing have a first end plate and a second end plate, the first end plate having an air inlet and the second end plate having an air outlet; an outer rotor positioned inside the casing; a stator positioned inside the outer rotor; a hub positioned inside the stator; a fan positioned within the casing, the fan drawing air from the air inlet and exhausting air out the air outlet.

Abstract: A laminated rotor and stator are provided for a dynamoelectric machine. The rotor includes at least one end flange having a plurality of cooling apertures and at least one rotor inner vent lamination having a plurality of cooling apertures. At least one rotor outer vent lamination has a plurality of cooling apertures in communication with a first plurality of radially oriented ventilating slots. The end flange, rotor inner vent lamination and rotor outer vent lamination are configured together into a rotor lamination stack, and the plurality of cooling apertures form a generally axial cooling passage for a flow of a cooling medium.

Abstract: A magnetic coupler comprises a magnet rotor that includes a permanent magnet; a conductor rotor that includes a non-ferrous electroconductive plate; and a fan mounted on one of the magnet rotor and the conductor rotor, wherein the fan is designed to blow air into the magnetic coupler during operation. The permanent magnet of the magnet rotor is spaced by an air gap from the electroconductive plate of the conductor rotor.

Abstract: A motor housing has a heat-dissipating casing having an outer casing and an inner casing. The outer casing is tubular and has an inner surface. The inner casing is tubular, is co-axially mounted in the outer casing and has multiple fins and multiple baffle ribs. The fins are formed on and protrude radially from an outer surface of the inner casing. The baffle ribs are formed on and protrude radially from the outer surface of the inner casing and are connected to the inner surface of the outer casing to form multiple air passages between the inner surface of the outer casing and the outer surface of the inner casing. Each baffle rib has two ends and a front threaded hole and a rear threaded hole defined respectively in the ends of the baffle rib.

Abstract: The present invention is directed to an airflow generation and particle dispersion arrangement for a power tool (e.g., an angle grinder). The arrangement includes a motor, an airflow generation assembly, and a particle dispersion assembly. The airflow generation assembly includes a fan driven by the motor. When engaged, the driven fan generates an airstream that is drawn through the power tool. The particle dispersion assembly includes a passive fan that is not driven by the motor, but instead is driven by the airstream. In operation, the passive fan generates centrifugal and mechanical forces sufficient to remove particles from intake air passing through the particle dispersion assembly.

Abstract: A cooling system is provided for an electric motor having control circuitry and including a motor housing surrounding the motor. The motor drives at least one radial fan at one end thereof for directing airflow through the motor housing across the motor. A fan housing encloses the cooling fan and defines a diverter chamber radially outboard of the fan that is sized to divert a portion of the airflow away from the electric motor. A control box contains the control circuitry and includes a base having a heat sink for contacting the control circuitry. The base defines a plenum in communication with the diverter chamber and a channel in communication with the plenum and the heat sink to direct the diverted airflow across the heat sink.

Abstract: According to an aspect of the invention, there is provided a power tool including: a commutator motor including a rotor and a stator having a substantially cylindrical stator core; a fan provided to face one axial end of the stator core so as to be rotatable coaxially with the rotor; and a stator coil bundle fixed to an inner peripheral surface of the stator core, the stator coil bundle having a coil end portion that protrudes more than the stator core in a rotational axis direction of the rotor, wherein a minimum internal diameter of the coil end portion is smaller than a maximum external diameter of the fan, and wherein the coil end portion has a fan facing portion that faces the fan along a direction perpendicular to the rotational axis direction.

Abstract: A drive motor, in particular for a fan wheel of a radiator of a motor vehicle, is provided. The drive motor comprising a stator, and a rotor rotating about an axis of rotation relative to the stator, which is driven in cooperation with the stator. Means for generating an air flow for cooling at least one component of the drive motor are arranged on the rotor.

Abstract: Vehicle AC generator comprises a stator comprising stator windings; front frame and rear frame, each rotatably supporting a rotor in the stator via a space on an inner circumference thereof; cooling fan fitted to the rotor; first polarity arm configured to rectify a current of one polarity; second polarity arm configured to rectify a current of another polarity; rectifier device configured to rectify an alternating current generated in stator windings; protective cover covering rectifier device. Rectifier device comprises first heat dissipating plate having rectifier elements forming first polarity arm, second heat dissipating plate rectifier elements forming second polarity arm, and connection plate formed in waveform-like shape and disposed between the first and second heat dissipating plates, and passage of a cooling air blown by the cooling fan formed between first heat dissipating plate and connection plate and between second heat dissipating plate and connection plate.

Abstract: A heat-dissipation structure for a motor. The heat-dissipation structure comprises a shaft, a seat and a rotator. The rotator coupled to the seat by the shaft comprises a housing and a cover. The housing comprises an inner side connected to the shaft and a bottom comprising at least one through hole. The cover is connected to an exterior of the bottom of the housing and a distance is formed between the cover and the housing, so that the cover prevents objects from entering the through hole.

Abstract: A washing machine is disclosed. An object of the present invention is to provide a washing machine which can radiate the heat generated from the stator outside, regardless of a rotational direction of a rotor.

Abstract: An electric motor includes an inner stator including inner magnetic poles arranged circumferentially, an outer stator including outer magnets arranged circumferentially, and a rotor rotatably disposed between the inner and outer stators. The rotor includes a shaft, a rotor core fixed to the shaft and a winding wound on the rotor core. The rotor core includes a ring shaped yoke having a plurality of inner teeth extending inwardly and a plurality of outer teeth extending outwardly. The winding includes a plurality coils each including an inner side received in a corresponding inner slot formed between adjacent inner teeth and an outer side received in a corresponding outer slot formed between adjacent outer teeth.

Abstract: An electric machine includes a stator and a rotor configured to rotate about an axis of rotation in a direction of angular rotation. The rotor includes a first claw-pole segment and an opposing second claw-pole segment. The first claw-pole segment includes a plurality of fingers extending from an end ring. Each finger includes a distal end and a proximal end with the proximal end fixed to the end ring. Each finger also includes an interior side and an exterior side with the exterior side facing the stator. A leading side and a trailing side are defined on each finger by the direction of angular rotation. A chamfer is formed on the exterior trailing side of each finger at the proximal end of the finger.

Abstract: An arrangement for cooling an electrical machine is provided. The electrical machine includes a rotor and a stator, an air-gap being between the rotor and the stator. The stator includes a plurality of stacked laminate-plates. The laminate-plates include on a first side, which is facing the air-gap, a plurality of slots containing metal-windings of a stator-coil. The laminate-plates are positioned and fixed by a structural support and by end-plates in relation to a central-part of the stator. A joint cavity is formed by the end-plates, the central-part of the stator and an internal surface of the laminate-plates. The internal surface is defined by a second side of the laminate-plates, the second side being opposite to the first side. The cavity is coupled with an air-cooling-arrangement, which is arranged and used to circulate a cooling gaseous medium from the cavity to the air-gap and the laminate-plates back into the cavity.

Abstract: An angle grinder is provided including a trigger assembly for selectively actuating the angle grinder. A particle separation assembly is provided for the removal of any dust, particle, or artifacts that may have entered into the housing of the angle grinder. A brush biasing system is also provided to ensure proper and efficient operation of the motor of the angle grinder. An overload monitoring system is included to monitor the loading on the motor. A clutch mechanism is also included to prevent overloading on the motor of the angle grinder. A gear wheel lock mechanism is also provided to prevent the wheel spindle from rotating during installation or removal of a grinding wheel on the wheel spindle. An anti-locking flange system is also included to prevent the over-tightening of the flanges and the grinder wheel during the operation of the angle grinder. A gear case labyrinth feature is also provided.

Abstract: An electric machine with improved cooling efficiency includes a stator, a rotor operating as a rotor fan and comprising a shaft defining an axial direction and having radial and axial cooling channels, and an axial fan configured as a twin axial fan and arranged coaxially with the shaft and supplying a coolant to the axial cooling channels. The axial fan has first and second blade rings and a funnel-shaped tube with a smaller opening directly connected to the axial cooling channels of the rotor to deliver coolant to the axial cooling channels of the rotor, and a larger opening, which is non-rotatably connected to and encloses the first blade ring. The second blade ring is firmly attached at an outer circumference of the funnel-shaped tube to deliver the coolant to the stator. Both the stator and the rotor can be cooled using an efficient coolant flow.

Abstract: A cooled fan motor may include an elongate housing adapted to be attached to a tankhead, the housing having at least one longitudinally extending groove, a shaft rotatably attached to the housing, a hub attached to the shaft, the hub having at least one opening therethrough and shaped to form a gap with a tankhead attached to the housing, a rotor attached to the hub, and a stator mounted on the housing such that the groove in the housing forms an air passage between the housing and the stator connecting the gap and the opening. Air external to the motor is able to enter through the gap between the hub and tankhead, flow along the air passage formed by the groove in the housing and exit the motor through the opening in the hub, thereby cooling an interior of the motor. In one aspect, the hub includes radially extending blades such that when the stator is energized, rotation of the hub and blades causes air to enter through the gap, flow along the air passage and exit the motor through the opening in the hub.

Abstract: A fan assembly with an impeller and shroud for application in a vehicle cooling system. The fan is powered by an external rotor brushless direct current (BLDC) motor having an electronic controller positioned away from the BLDC on an outer shroud wall with a plurality of ducts drawing an airflow from a static lower pressure created by the impeller, the airflow streaming over a heat sink disposed on the controller, exiting through a shroud. The static lower pressure air is pulled by a centrifugal fan and skewed magnets inside the motor through a plurality of ducts in a shroud hub, cooling the BLDC, maintaining low resistance for high efficiency. The BLDC is integrated into the assembly, having a stator fixed in the shroud hub and a rotor directly fused to the impeller, the shroud and impeller forming the BLDC motor without a housing, allowing the motor to easily dissipate heat.

Abstract: Embodiments of the invention provide an electric machine module and a method for cooling an electric machine. The electric machine module includes the electric machine including a stator with stator end turns and a housing enclosing the electric machine. An inner wall of the housing defines a machine cavity. The electric machine module also includes a cover coupled to the housing and extending radially inward into the machine cavity. The cover and the stator end turns define a stator cavity which is in fluid communication with the machine cavity.

Abstract: A fan assembly with impeller and shroud for application in a vehicle cooling system. The fan is powered by an external rotor brushless direct current (BLDC) motor having an electronic controller positioned away from the BLDC on an outer shroud wall with a plurality of ducts drawing an airflow from a static lower pressure created by the impeller, the airflow streaming over a heat sink disposed on the controller, exiting through a shroud. The static lower pressure air is pulled by a centrifugal fan and skewed magnets inside the motor through a plurality of ducts in a shroud hub, cooling the BLDC, maintaining low resistance for high efficiency. The BLDC is integrated into the assembly, having a stator fixed in the shroud hub and a rotor directly fused to the impeller, the shroud and impeller forming the BLDC motor without a housing, allowing the motor to easily dissipate heat.

Abstract: An axial-flow fan for a vehicle radiator includes a fan wheel that delivers the main air flow and is driven by a hub motor coupled to the fan wheel. The vehicle radiator is on the intake side of the fan wheel, the hub motor during operation is cooled by a secondary air flow, and the cooling air flow of the hub motor flowing out from an air outlet opening is on the intake side in the hub area of the fan wheel. An air baffle device including a propeller is assigned to the hub motor and the cooling air flow passing through the air baffle device is led out of the air outlet opening, avoiding disturbances of the main air flow delivered by the fan wheel.

Abstract: A fan-motor unit comprises a fan driven by an electric motor, both mounted on a support, at least one inlet (I) and one outlet (S) for a forced air flow, an electronic circuit board for controlling the motor, and a radiator at least partially immersed in the forced air flow. The radiator has a curved peripheral edge determining a convex face and a concave face of the said radiator, the electronic circuit board being in contact with the said radiator on the concave face side and a substantially cylindrical bearing surface on the convex face side of the said radiator. A radial gasket that forms a skirt comprises a first end secured to the support, a free second end, and a substantially cylindrical interior face between the first and second ends, and the interior face of the radial gasket bears against the bearing surface so as to isolate the electronic circuit board from the air flow.

Abstract: In a controller-integrated electric rotating machine provided with a power circuit unit and a control circuit unit, a cooling property is improved so that the control circuit unit does not impair a flow of air for cooling the power circuit unit. A power circuit unit (30) having switching elements (30a, 30b) for converting DC power to AC power for supplying the AC power to an electric rotating machine (2), a control circuit unit (32) for controlling the switching elements (30a, 30b) of the power circuit unit (30), and a rotational position detection sensor (4) arranged on a rotating shaft (22) for detecting the rotation of the rotating shaft (22) are provided, and the control circuit unit (32) is disposed at a position where the power circuit unit (30) is not disposed when viewed in the direction of the rotating shaft, and is disposed at a position shifted radially outward so as not to be overlapped with the rotational position detection sensor (4) when viewed in the direction of the rotating shaft.

Abstract: An air-gap is between a rotor and a stator. The stator comprises a number of stacked laminate-plates. The laminate-plates are positioned and fixed by a structural support and by end-plates in relation to a central-part of the stator to achieve the air-gap. A cavity is formed by the end-plates, the central-part of the stator, the air-gap and an internal surface of the rotor. An air-cooling arrangement is arranged and used to circulate a gaseous medium for cooling purposes inside the cavity.

Abstract: A brushless DC motor structure including a motor body, a controller, and a fan radiator. The fan radiator is mounted between the motor body and the controller to disperse heat from the motor body and the controller. The brushless DC motor structure increases air flow on the surface of the motor body and the controller by the fan radiator and speeds up heat dispersion, and meanwhile effectively controls the operating temperature of the motor body and the controller. Thus, the brushless DC motor structure has an excellent heat dispersion capability, and the failure rate thereof has been largely reduced.

Abstract: A power plant for a jet-type model airplanes and UAVs includes an electric motor and a cover. The cover receives a portion of the electric motor and a sleeve into which the electric motor is inserted. The sleeve has a plurality of fins to dissipate heat and create openings into the cover. Air from the fan rotor passes through the openings to cool an electronic speed control member and exits a rear opening in the cover. The cover may also have additional openings for air to enter into the cover.

Abstract: A permanent magnet alternator includes a permanent magnet alternator stator attached to a housing. A shaft is rotatable with respect to the housing with a permanent magnet alternator rotor attached to the shaft. The permanent magnet alternator rotor is positioned with respect to the permanent magnet alternator stator so as to generate electricity when the shaft rotates. A cooling fan is also attached to the shaft and is positioned in a gas flow path for flowing air through the gas flow path.

Abstract: A motor rotor system including: an axis of rotation, a rotor iron core mounted on the axis of rotation, a permanent magnet, a magnetic ring bracket, and a magnetic ring. The permanent magnet, the magnetic ring bracket, and the magnetic ring are mounted on the rotor iron core. The magnetic ring is sheathed on the magnetic ring bracket. The magnetic ring bracket is located at one end of the rotor iron core and connected with an end face of the rotor iron core. The motor rotor system has excellent batch-to-batch consistency, simple structure, and convenient installation. It is suitable for large batch production and can be controlled using sine-wave driving control methods with a position sensor.

Abstract: A motor has an output shaft which is rotatably supported by a housing, a rotor which is fixed to the output shaft and which comprises a printed-wiring board, and a stator which is fixed to the housing and which comprises a magnet facing the rotor. The printed-wiring board comprises a coil/commutator disk and a coil disk. A commutator conductor pattern is formed in a commutator region of the coil/commutator disk. Likewise, coil conductor patterns are formed in respective coil regions of the coil/commutator disk and of the coil disk.

Abstract: Certain exemplary embodiments can comprise a system, which can comprise an electric motor cooling fan. The electric motor cooling fan can be driven by an auxiliary motor distinct from an electric motor adapted to be cooled by the electric motor cooling fan. The system can comprise a motor enclosure of the electric motor. The motor enclosure can be configured in a predetermined ventilation pattern.

Abstract: A concrete vibrator system with a constant speed motor, one of a set of vibrator heads with different load characteristics, and one of a set of drive shafts connecting the motor output shaft with one of the vibrator heads. A speed control circuit senses motor shaft speed and maintains constant speed. The motor is cooled by a fan mounted on the motor rotor which draws air through an inlet and exhausts air through an outlet both of which face downwardly when the motor is in use. Rain or other liquids are prevented from reaching the motor.

Abstract: An electric motor having a housing, a stator mounted in the housing, and a rotor mounted in the housing for rotation relative to the stator about a central axis. A plurality of fluid flow passages extend through the rotor between opposite ends. An electro-magnetic drive system is adapted for driving rotation of the rotor relative to the stator. A fluid circulation system is in fluid communication with the fluid flow passages for providing fluid flow from the first end of the rotor to the second end of the rotor through at least one of the fluid flow passages and fluid flow from the second end of the rotor to the first end of the rotor through at least one other of the fluid flow passages. The rotor and components of the fluid circulation can be assembled to make a rotor assembly.

Abstract: A laminated rotor and stator are provided for a dynamoelectric machine. The rotor includes at least one end flange having a plurality of cooling apertures and at least one rotor inner vent lamination having a plurality of cooling apertures. At least one rotor outer vent lamination has a plurality of cooling apertures in communication with a first plurality of radially oriented ventilating slots. The end flange, rotor inner vent lamination and rotor outer vent lamination are configured together into a rotor lamination stack, and the plurality of cooling apertures form a generally axial cooling passage for a flow of a cooling medium.

Abstract: A cooling arrangement is disclosed for an electrical machine in which the main cooling air circulation within the machine is arranged using a centrifugal blower in at least one of the ends of the machine, making the main cooling air circulation flow through at least an air space in the machine and the outer surface of the stator. A circulating fan is arranged in the immediate vicinity of the centrifugal fan for the purpose of generating a coil end circulation that circulates air at least in the area of the machine's coil ends.

Abstract: In one aspect, an arrangement for cooling of an electrical machine is provided. A rotor and a stator include an air-gap arranged between the rotor and the stator. The rotor and the stator include a circulation arrangement to allow the circulation of air for cooling-purposes of the rotor and of the stator. The rotor and the stator are encapsulated by a shell which is formed to allow the flow of hot air from the rotor and the stator to a heat-exchanger. The shell is formed to allow the flow of cool air from the heat-exchanger back to the rotor and the stator for cooling-purposes. The shell includes a number of corners, while each corner is used to gather the hot air before it is guided to the heat-exchanger.

Abstract: An exciter machine including an auxiliary exciter machine and a fan is provided. The fan is arranged on one side of the exciter machine and includes a mount ring on the external circumference on which permanent magnets are arranged in order to form an auxiliary rotor. The auxiliary rotor is moved within an auxiliary exciter stator.

Abstract: There is provided a vehicle AC generator in which the contact face of at least one of a pair of cases that make contact with the respective axis-direction end faces of a stator core is provided with a cooling air path that connects the outer circumferential surface of a coil end portion with the outer circumferential surface of the stator core and has an opening in the axis direction at the outer circumferential surface of the stator core so that the coolability of the coil end portions of the stator coil is raised, and the amount of cooling air is increased so that the overall coolability of the AC generator is improved.

Abstract: Electric machine, in particular an electric motor, which comprises a motor support, a stator, a rotor, a fan arranged at the face end of said motor and an electronics casing disposed adjacent to the motor support for electronic components to be arranged in wherein a face-end wall of the motor support which is assigned to the fan is provided with an axial opening such that an air stream discharged from the motor support is by means of said fan deflected toward the electronics casing.

Abstract: An angle grinder is provided including a trigger assembly for selectively actuating the angle grinder. A particle separation assembly is provided for the removal of any dust, particle, or artifacts that may have entered into the housing of the angle grinder. A brush biasing system is also provided to ensure proper and efficient operation of the motor of the angle grinder. An overload monitoring system is included to monitor the loading on the motor. A clutch mechanism is also included to prevent overloading on the motor of the angle grinder. A gear wheel lock mechanism is also provided to prevent the wheel spindle from rotating during installation or removal of a grinding wheel on the wheel spindle. An anti-locking flange system is also included to prevent the over-tightening of the flanges and the grinder wheel during the operation of the angle grinder. A gear case labyrinth feature is also provided.

Abstract: An electric machine includes a rotor. The rotor includes a body having a number of pole members, a central hub, and a plurality of mounting members. The plurality of mounting members are fewer than half the number of pole members. A fan member is mounted to the rotor. The fan member includes a number of fan blades that project outward from a hub portion. A plurality of mounting elements are provided on select ones of the number of fan blades. The plurality of mounting members engage respective ones of the plurality of mounting elements to attach the fan member to the rotor.

Abstract: An electric motor assembly including a stator having a stator core and windings around the stator core is disclosed. The stator core has opposing ends and an outer surface extending between the opposing ends. The electric motor assembly also includes a housing having an inner surface enclosing at least a portion of the stator, and at least one fluid passage between the outer surface of the stator core and the inner surface of the housing. The fluid passage permits a coolant in the fluid passage to contact one or more portions of the outer surface of the stator core to remove heat from the stator core during operation of the electric motor assembly. Additional motor assemblies including stator and/or rotor cooling features are disclosed.