Patent application number | Description | Published |
20090001996 | SYSTEMS AND METHODS TO EVALUATE PERMANENT MAGNET MOTORS - Methods and systems for evaluating a permanent magnet motor are provided. The method includes the steps of spinning a rotor of the permanent magnet motor; determining a total harmonic distortion of the permanent magnet motor; and comparing the determined total harmonic distortion of the permanent magnet motor with a baseline total harmonic distortion. | 01-01-2009 |
20090058010 | APPARATUS AND METHOD FOR REDUCING STRAY RF SIGNAL NOISE IN AN ELECTRICALLY POWERED VEHICLE - RF signal noise in a powertrain utilizing a power inverter module and electric motor is attenuated by providing a low impedance connection between a transmission output shaft and housing. | 03-05-2009 |
20090115264 | Rotating electric machine apparatus and method of assembly - A rotating electric machine apparatus includes at least one end plate associated with an inner assembly unit that operates to prevent contact between the inner assembly unit and an outer assembly unit. The end plate is peripherally sized to allow the slidable assembly of the inner assembly unit into the outer assembly unit while preventing undesirable contact of the inner assembly unit with the outer assembly unit. | 05-07-2009 |
20090127942 | CONCENTRATED WINDING MACHINE WITH MAGNETIC SLOT WEDGES - Methods and apparatus are provided for improving operational characteristics of a concentrated winding machine. According to an example embodiment, an apparatus comprises stator teeth having distal ends, the stator teeth arranged in an annular fashion about an axis to define stator slots between adjacent teeth and slot openings between the distal ends of the adjacent teeth, the stator teeth structured to prevent relative movement between adjacent teeth. The apparatus further comprises magnetic wedges structured to be inserted between the distal ends of the adjacent teeth to close the slot openings. | 05-21-2009 |
20090140592 | METHODS AND APPARATUS FOR A PERMANENT MAGNET MACHINE WITH AN ADDED AIR BARRIER - An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor with an additional air barrier provided above the first magnet barrier in the same rotor slot. Each magnet only fills a portion of each cavity, thereby defining the air barriers. The added air barrier above the permanent magnet of the first layer acts as a barrier to the first layer magnet and lowers the magnet flux. | 06-04-2009 |
20090140593 | METHODS AND APPARATUS FOR A PERMANENT MAGNET MACHINE WITH ADDED ROTOR SLOTS - An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor with additional, small rotor slots configured to provide and averaging effect with respect to rotor barriers provided therein. | 06-04-2009 |
20090140596 | METHODS AND APPARATUS FOR A BAR-WOUND STATOR WITH PARALLEL CONNECTIONS - A bar-wound stator design with parallel connections is characterized by a shorter end turn length as compared to conventional stranded winding. The stator includes an inner winding set and an outer winding set provided within a plurality of slots, wherein the inner winding set is parallel to the outer winding set, and each winding set comprises multiple phases; and wherein the inner winding set and the outer winding set are staggered one slot within the plurality of slots. | 06-04-2009 |
20100102666 | METHODS AND APPARATUS FOR AN ELECTRIC MACHINE WITH A CAST ROTOR - A squirrel cage rotor structure used in connection with an electrical machine is formed from a high-strength, high-conductivity, and heat-treatable aluminum alloy, e.g., a T61 tempered aluminum alloy, such as A6101-T61. The resulting structure has improved strength compared to conventional pure aluminum structures, while at the same time limiting the reduction in electrical conductivity. | 04-29-2010 |
20100213781 | METHODS AND APPARATUS FOR A PERMANENT MAGNET MACHINE WITH ASYMMETRICAL ROTOR MAGNETS - In general, the various embodiments are directed to a permanent magnet machine (“PM machine”), and more specifically an internal permanent magnet machine (“IPM machine”) that includes rotor magnets configured asymmetrically with respect to the rotor periphery, thereby producing an averaging effect similar to that achieved through traditional skewing of the rotor magnets. In alternate embodiments, the span, placement and/or shape of the magnets may vary from one pole to the next. | 08-26-2010 |
20100247229 | END RING FOR A VEHICULAR ELECTRIC MACHINE - An end ring for a rotor assembly in a vehicular electric machine is provided, wherein the rotor assembly has a first end and is configured to rotate on a shaft. The end ring comprises an annulus circumscribing the shaft and engaging the end of the rotor assembly, and a sleeve coupled to the annulus and circumferentially coupled to the shaft. | 09-30-2010 |
20100253165 | PHASE LEAD CONNECTIONS FOR A BAR WOUND STATOR - A stator assembly includes a stator stack and a plurality of lead conductors extending from the stator stack. A plurality of conductor terminals are each connected to a respective one of the plurality of lead conductors. A plurality of wires are each connected to a respective one of the plurality of conductor terminals and a plurality of phase lead connection terminals are each connected to at least one of the plurality of wires. | 10-07-2010 |
20100253175 | ISOLATOR RING FOR AN ELECTRIC MOTOR - A stator assembly includes a stator stack and a plurality of conductors extending from the stator stack. An isolator/assembly ring is located on the stator stack. The isolator/assembly ring includes a plurality of inwardly protruding fingers. A method of assembling the stator assembly includes threading the plurality of conductors through the stator stack such that each of the plurality of fingers on the isolator/assembly ring is located between respective ones of the plurality of conductors. | 10-07-2010 |
20100266366 | FASTENER RETENTION SYSTEM - An apparatus includes structure defining a first hole that is characterized by an opening. A protuberance surrounds the opening and at least partially defines a concavity. A retention member is disposed within the concavity, and defines a second hole. The second hole has a first portion characterized by a first diameter and a second portion characterized by a second diameter. A threaded fastener has a flange characterized by a third diameter greater than the first diameter and less than the second diameter. The flange is disposed within the second portion of the second hole and between the first portion of the retention member hole and the first surface. Accordingly, the retention member retains the fastener in the concavity while permitting radial movement of the fastener. | 10-21-2010 |
20100277027 | SKEW PATTERN FOR A PERMANENT MAGNET ROTOR - A rotor for an electric machine includes a plurality of magnet stacks having at least five permanent magnets formed into a skew pattern within each of the magnet stacks. The skew pattern has a skew angle and at least two skew steps, and is an angle of rotation about the axis between individual magnets adjacent to the skew steps. The skew pattern may be an axially-symmetric V-shape. The plurality of magnet stacks may have five, six, or eight permanent magnets therein. The number of skew steps may be equal to two or three. The skew angle may be calculated as 360 degrees, divided by the number of skew steps plus one, multiplied by the least common multiple of the number of rotor poles and the number of the plurality of stator slots. | 11-04-2010 |
20100320864 | METHODS AND APPARATUS FOR A BAR-WOUND STATOR WITH ROTATED CONDUCTORS - A bar-wound stator includes a plurality of bar-type conductors disposed within the plurality of slots, wherein, within each slot, at least one of the bar-type conductors has an orientation that differs from the remaining bar-type conductors within that slot by a predetermined angle. For example, conductors with rectangular cross-sections can be inserted such that the conductors closest to the inner surface of the stator are rotated ninety degrees with respect to the remaining conductors. | 12-23-2010 |
20110037339 | CONCENTRATED WINDING MACHINES WITH REDUCED TORQUE RIPPLE AND METHODS FOR DESIGNING THE SAME - Systems and methods are provided for a motor having a concentrated winding construction with reduced torque ripple. A motor comprises a stator including a plurality of tooth segments disposed circumferentially to establish a hollow core and a rotor rotatably disposed inside the hollow core. The plurality of tooth segments define a plurality of slot openings associated with a plurality of slots. Each slot of the plurality of slots has a slot opening and at least one slot opening of the plurality of slot openings is asymmetric with respect to the plurality of slot openings. | 02-17-2011 |
20110050026 | INSULATION ASSEMBLY FOR A STATOR CORE - An assembly for providing electrical insulation in a stator core of a vehicular electric machine is provided. The stator core has a channel and the assembly comprises a first conductive element disposed through the channel, and a second conductive element disposed through the channel and substantially adjacent to the first conductive element. The assembly also comprises a first electrically insulating film having a first end residing between the first and second conductive elements. | 03-03-2011 |
20110169382 | RESOLVER WITH LOCATING FEATURE - A resolver is configured to determine the rotational position of a first member that is selectively rotatable about an axis with respect to a second member. The resolver includes a stator core, a plurality of wire windings operatively connected to the stator core, a winding support between the windings and the stator core, and a cover at least partially enclosing the windings. One of the cover and the winding support defines a pin that is fittable inside a hole in the second member. The pin functions as a locating feature, which ensures that the stator is accurately mounted to the second member. Because the pin is part of the winding support or the cover, the locating feature does not entail the use of an extra part, thereby simplifying assembly of the stator. | 07-14-2011 |
20110175482 | OPTIMIZED STATOR TOOTH TIP FOR A MOTOR WITH AXIALLY INSERTED STATOR WINDINGS - An electric motor includes a rotor and a stator assembly concentrically located about the rotor. The stator assembly includes a stator stack and a plurality of spaced apart stator teeth extending radially from the stator stack. The plurality of stator teeth defines a plurality of stator slots. Each stator tooth defines a stator tooth tip. The stator tooth tips are shaped to reduce the magnetic flux generated by the stator assembly during operation of the electric motor | 07-21-2011 |
20110278972 | CONDUCTIVE CONNECTION FOR BAR-WOUND STATORS - A bar-wound stator, which is connectable to a plurality of fixed terminal points, includes a plurality of stator teeth and a plurality of magnet wires. Each of the plurality of magnet wires has a winding portion wound about at least one of the plurality of stator teeth and a junction portion extending away therefrom. A plurality of flexible leads each have a first portion ultrasonically welded directly to a respective one of the junction portions of the plurality of magnet wires. A second portion of each of the plurality of flexible leads extends flexibly away from the first portion and is configured for attachment to a respective one of the fixed terminal points. | 11-17-2011 |
20110298331 | ELECTRIC MACHINE - An electric machine having a stator body and a machine housing is provided. The stator body includes a stator ring of generally annular shape and a plurality of stator teeth projecting radially inward. A first bolt hole is defined in either the stator ring or machine housing, and a first receptacle is defined in the other and is coaxial with the first bolt hole. A second bolt hole is defined in either the stator ring or machine housing, and a second receptacle is defined in the other and is coaxial with the second bolt hole. A first counter bore is coaxial with the first receptacle. A first hollow dowel is mated to the first counter bore and the first bolt hole, and defines a first dowel hole, which is coaxial with the first counter bore and the first bolt hole. | 12-08-2011 |
20120187797 | STATOR ASSEMBLY HAVING A PHASE-TO-PHASE INSULATOR, AND A METHOD OF ASSEMBLYING A STATOR ASSEMBLY - An insulator assembly for a stator assembly of an electric machine includes an annular ring attached to a stator core, and a plurality of coil separators supported by the annular ring and extending from the annular ring axially along a longitudinal axis. One of the coil separators is disposed between each adjacent pair of the coils to prevent contact between adjacent coils having a different electrical phase. The coil separators are slideably inserted between the adjacent pairs of coils, with the annular ring positioning and supporting the coil separators. | 07-26-2012 |
20120248906 | ROTOR ASSEMBLY WITH COOLING MECHANISM - A rotor assembly with a cooling mechanism having first and second channels is provided. The rotor assembly includes a shaft having a hollow portion and a rotor core having at least one rotor stack positioned at least partially around the shaft. The rotor core has a first end and a second end. The rotor stack forms an interior cavity which is only partially filled with a permanent magnet so as to define a gap in the rotor stack. The first channel is configured to direct fluid flow in a generally radial direction from the hollow portion of the shaft. The second channel is at least partially defined by the gap in the interior cavity of the rotor stack and is configured to direct the fluid flow from the first channel to at least one of the first and second ends of the rotor core. | 10-04-2012 |
20120286613 | ASYMMETRIC STATOR TEETH IN AN ELECTRIC MOTOR - A permanent magnet motor includes a permanent magnet rotor, a stator surrounding the rotor having a plurality of teeth radially inwardly oriented toward a longitudinal axis of the stator wherein each tooth has a tooth length and a tooth tip surface geometry. An asymmetric air gap is defined by variations in the tooth lengths and tooth tip surface geometries. | 11-15-2012 |
20120288380 | PUMP-MOTOR ASSEMBLY - A pump-motor assembly includes a motor housing, a motor disposed substantially within the motor housing, and a pumping element driven by the motor. A pressurized region is filled with a fluid pressurized by the pumping element, and a fluid passage is in fluid communication with the pressurized region and the motor housing. Fluid flows from the pressurized region to the motor housing and at least partially submerges the motor. | 11-15-2012 |
20120293105 | ROTOR SLOT ASYMMETRY IN AN ELECTRIC MOTOR - An electric motor includes a stator configured to receive electrical energy and generate an electromagnetic field in accordance with the electrical energy received. A rotor is in electromagnetic communication with the stator and is configured to rotate in accordance with the electromagnetic field generated by the stator. The rotor includes a plurality of poles including a first set of poles and a second set of poles. The first set of poles defines a first slot and the second set of poles defines a second slot that has a different configuration than the first slot to reduce a torque ripple effect. The electric motor may be used in a system having a power source configured to output direct current energy and an inverter configured to convert direct current energy to alternating current energy. | 11-22-2012 |
20130000455 | METHOD OF MANUFACTURING SEGMENTED STATOR CORES - A method of manufacturing a stator core is disclosed. The method includes advancing a blank at each of a plurality of press cycles to form a segment at each of the press cycles and shaping the segments. Shaping the segments further includes activating a tooth punch, activating a mounting-ear punch, and activating an joint punch. The method also includes separating the segments from the blank. | 01-03-2013 |
20130002086 | SEGMENTED STATOR CORE - A stator core includes a first lamination and a second lamination. The first lamination is formed from a plurality of first segments and has a plurality of first mounting ears. The second lamination is formed from a plurality of second segments and has a plurality of second mounting ears. The first lamination and the second lamination are aligned with a common axis and are rotated about the common axis such that the first lamination is not aligned with the second lamination. | 01-03-2013 |
20130076175 | CONNECTION MODULE FOR A BAR WOUND STATOR ASSEMBLY AND METHOD OF MANUFACTURING A BAR WOUND STATOR ASSEMBLY - A bar wound stator assembly includes a connection module attached to a stator core at a weld end of the stator assembly. The connection module provides all required electrical connections to connect shaped plurality of hairpin bar connectors of the stator assembly within a first pole pair of a winding set of conductors. All of the hairpin bar conductors include an identical span. The connection module completes each phase of the winding set, to connect each phase of the winding set to define a connection configuration, e.g., a wye or a delta connection configuration, and to connect the stator assembly to all external connections. | 03-28-2013 |
20130095232 | METHOD OF APPLYING VARNISH TO A STATOR - A method of applying varnish to a stator includes orienting a center axis of the stator substantially parallel to gravity, and orienting a crown end of stator windings upward and a weld end of the windings downward, relative to gravity. The crown end and the weld end of the stator are disposed on opposing sides of the core. The weld end is placed above a dip tank and varnish applied to the crown end of the windings with at least one nozzle. The nozzle is controlled along a first direction and a second direction, which are perpendicular to the center axis. The varnish substantially coats the crown end of the windings, runs through the slots, and drips from the weld end of the windings into the dip tank. The dip tank is raised to submerse the weld end of the windings but not the core. | 04-18-2013 |
20130140923 | ELECTRIC MACHINE COOLING STRUCTURE - A housing surrounding a stator or a rotor includes an annular cooling chamber, which is formed within the housing and defines a circumferential fluid path around the stator or rotor. A fluid inlet and a fluid outlet are communication with the annular cooling chamber. A primary divider separates the fluid inlet from the fluid outlet. | 06-06-2013 |
20130140938 | BALANCED ROTOR CORE WITH REDUCED MASS AND INERTIA LAMINATIONS - A rotor core configured to rotate about an axis includes a first end lamination, a second end lamination, and a middle lamination, which is disposed axially between the first end lamination and the second end lamination. The middle lamination has a plurality of first apertures, and the first end lamination and the second end lamination do not have the first apertures. | 06-06-2013 |
20130147299 | INTERIOR PERMANENT MAGNET MACHINE WITH POLE-TO-POLE ASYMMETRY OF ROTOR SLOT PLACEMENT - An interior permanent magnet machine includes a rotor having a plurality of slots. First and second slots are disposed in a first pole and the third and fourth slots are disposed in a second pole. A first barrier is defined by the first, second, third and fourth slots. The slots are configured to be symmetric relative to their respective pole axes. A first angle is defined between the first and second slots. A second angle is defined between the third and fourth slots. The first angle is configured to be sufficiently different from the second angle so that torque ripple is minimized. Thus the rotor is configured such that the angular configuration of slots in a first pole is different from the angular configuration of slots in a second pole of the rotor. | 06-13-2013 |
20130147303 | MULTI-LAYER ARC-SHAPED PERMANENT MAGNET MACHINE WITH REDUCED ROTATIONAL STRESS - An interior permanent magnet machine includes a rotor configured to magnetically interact with a stator. First and second dividers are integrally formed within the rotor and configured to create a first layer of three respective first segments. Each of the respective first segments may be substantially arc-shaped. A plurality of first magnets may be positioned in the first layer. The first magnets may be substantially arc-shaped and defined around an arc center. A third and a fourth divider may be integrally formed within the rotor and configured to create a second layer of three respective second segments. The placement of dividers or structural webs provides for increased rotational speed and reduced rotational stress compared to an undivided arc-shaped magnet configuration. | 06-13-2013 |
20130154437 | SUPPORT RING FOR ELECTRIC MACHINE ROTORS - A support ring for a rotor having a core and a plurality of windings. The support ring includes an annular base, a plurality of fingers, and a plurality of loaded edges. The plurality of fingers extend radially outward from the annular base, and each generally corresponds to one of the windings. The plurality of loaded edges extend axially from the fingers and are disposed radially outward of the windings. | 06-20-2013 |
20130207493 | ROTOR COOLING STRUCTURES - A rotor defines an axial direction and a radial direction relative to an axis of rotation and includes an annular hub and a core disposed radially outward of the annular hub. The core defines a first axial side and a second axial side. First radial feed holes are formed in the annular hub, and are located between the first and second axial sides. Axial channels are formed between the core and the annular hub, and are in fluid communication with the first radial feed holes and span substantially between the first and second axial sides. The rotor also includes a first member and a second member, adjacent to the first and second axial sides, respectively. First and second apertures are formed in the first and second members, respectively. Each of the first and second apertures is in fluid communication with one of the axial channels. | 08-15-2013 |
20130221810 | TRANSMISSION ASSEMBLY WITH INTEGRATED MOTOR POSITION SENSOR - A transmission-mounted electric machine includes an integrated rotational position sensor. The rotational position sensor includes a rotor element and a stator element. The stator element is attached to a stator element of the transmission at a plurality of mounting points and includes an alignment adjustment mechanism. The rotor element of the sensor is slip-fit against a shoulder of a rotor hub and held in place using a wave spring. | 08-29-2013 |
20130249345 | SEGMENTED ROTOR IN A ROTOR ASSEMBLY - A rotor assembly is provided. The assembly includes a hub and a rotor core having a first rotor lamination positioned at least partially around the hub. The first rotor lamination is at least partially defined by a first segment and a second segment that are configured to connect or interlock. The first segment includes a projection extending from a first body. The projection is configured to engage with a corresponding notch in the second segment in order to connect the first segment to the second segment. At least one first mounting tab extends from the first body and is configured to engage with a corresponding first groove on an outer periphery of the hub in order to connect the first segment to the hub. | 09-26-2013 |
20140167547 | ELECTRIC MACHINE WITH FRACTIONAL SLOT WINDINGS - An electric machine includes a stator core defining a number of stator slots (Z). A rotor assembly is positioned at least partially within the stator core. The rotor assembly includes at least one permanent magnet and defines a number of poles (M). A plurality of stator windings are positioned in the number of stator slots and define a number of phases (M). The machine defines a non-integer slots per pole per phase value (X), which is expressed as a mixed fraction in the form of A.(B/C), where A, B and C are integers. Optimal configurations for the electric machine are specified that maximize torque while minimizing torque ripple, noise and manufacturing complexity. In one embodiment, the slots per pole per phase value (X) is 2½. In another embodiment, the slots per pole per phase value (X) is 3½. | 06-19-2014 |
20140209018 | METHOD, SYSTEM, AND STRUCTURE OF STATOR WITH COMMON INSULATING AND VARNISHING RESIN - A stator having a common varnish and weld insulation includes a stator lamination core and a motor winding wound around the stator lamination core. The motor winding includes a plurality of magnet wires configured such that they are substantially parallel to each other. Each magnet wire has two distal ends configured such that each distal end is welded to one distal end of an adjacent magnet wire, thereby forming a plurality of welded tips. The stator further includes a resin coating the welded tips and the stator. The resin serves as both a primary insulation for the welded tips, and as a varnish for the stator. This dual function of the resin may eliminate the need for separate insulation for the welded tips and varnish for the stator, and allow the resin to be applied to the welded tips and to the stator at substantially the same time. | 07-31-2014 |
20140319958 | COIL RETAINER FOR ELECTRIC MACHINE ROTORS - A coil retainer for a rotor includes a flat body and a longitudinal spine. The flat body has a first thickness and the longitudinal spine has a second thickness greater than the first thickness. The coil retainer may also include a central rib, which has a third thickness. The central rib runs laterally relative to the flat body and the third thickness of the central rib is greater than the first thickness. | 10-30-2014 |
20140319959 | INSULATION SYSTEM FOR AN ELECTRIC MACHINE - A bar wound stator includes a stator core defining a plurality of slots. Bar-type conductors are disposed within each slot. Each slot includes a slot liner and an insulator cap. Each slot liner includes an end portion disposed against an inner wall surface, and side portions disposed against a first wall surface and a second wall surface respectively. Each insulator cap includes a base portion disposed against an outer wall surface, and side portions disposed against the first wall surface and the second wall surface respectively. The side portions of the insulator cap in each slot overlap the side portions of the slot liner in each slot along the first wall surface and the second wall surface respectively. Each slot includes a recessed feature in each of the first wall surface and the second wall surface to accommodate the overlapping side portions of the insulator cap and the slot liner. | 10-30-2014 |
20140338184 | METHOD AND APPARATUS FOR INJECTION MOLDING ROTOR MAGNETS - A method and assembly for forming a rotor include forming a rotor core having a plurality of voids and placing the formed rotor core into a die cavity. The method includes moving a plurality of support shoes to define an outer diameter of the die cavity, and injecting at least one of the plurality of voids with a magnetic slurry. At least one permanent magnet is formed from the magnetic slurry by applying pressure to the rotor core and the magnetic slurry within the die cavity and by applying a magnetic field to align the magnetic slurry. After forming the at least one permanent magnet within the rotor core, the plurality of support shoes are retracted and the rotor core removed with the at least one permanent magnet formed therein. | 11-20-2014 |
20140354107 | ELECTRIC MOTOR ASSEMBLY AND METHOD - An electric motor assembly includes a housing and a stator. The housing includes an outer housing surface, an inner housing surface defining an interior housing cavity, and a plurality of housing protrusions extending from the inner housing surface. The stator is disposed in the inner housing cavity and includes an outer stator surface, an inner stator surface, and a plurality of stator protrusions extending from the outer stator surface toward the outer housing surface. The stator protrusions are configured to mate with the housing protrusions to frictionally couple the stator to the housing in order to fix the stator relative to the housing. | 12-04-2014 |
20150028713 | STATOR ASSEMBLY WITH WINDING SETS HAVING HAIRPINS FROM MULTIPLE HAIRPIN LAYERS - A stator assembly includes a plurality of stator slots defining multiple slot layers. The assembly includes a plurality of hairpins each having a respective first leg positioned in one of the multiple slot layers and a respective second leg positioned in another of the multiple slot layers. Each hairpin is configured to allow a current to flow from the respective first leg to the respective second leg. The plurality of hairpins is divided into multiple hairpin layers. The hairpins form multiple winding sets, such as first, second, third and fourth winding sets. Each of the winding sets at least partially includes the hairpins from at least two of the multiple hairpin layers. The multiple slot layers may include six slot layers. The multiple hairpin layers may include six hairpin layers. Thus, at least one of the hairpin layers may be “shared” by two winding sets. | 01-29-2015 |
20150035391 | APPARATUS, SYSTEM, AND METHOD FOR COOLING AN ELECTRIC MOTOR - An apparatus for providing a coolant to a stator and a rotor of an electric motor in a vehicle having a coolant pump is provided. The apparatus includes a base defining a plurality of first openings through at least one of which the coolant is flowable to the stator. The apparatus also includes at least one wall extending from the base to define a cavity configured to receive the coolant from the coolant pump. The apparatus further includes at least one first raised member within the cavity that extends from the base. The at least one first raised member defines at least one second opening substantially aligned with one of the first openings to form a first passageway through which the coolant is flowable to the rotor. The apparatus may be located above the electric motor such that the coolant is flowable by gravity to the stator and/or the rotor. | 02-05-2015 |
20150084452 | INTERIOR PERMANENT MAGNET MACHINE WITH POLE-TO-POLE ASYMMETRY OF ROTOR SLOT PLACEMENT - An interior permanent magnet machine includes a rotor having a plurality of slots. First and second slots are disposed in a first pole and the third and fourth slots are disposed in a second pole. A first angle is defined between respective centerlines of the first and second slots. A second angle is defined between respective centerlines of the third and fourth slots. The first angle is configured to be sufficiently different from the second angle so that torque ripple is reduced. Thus the rotor is configured such that the angular configuration of slots in a first pole is different from the angular configuration of slots in a second pole of the rotor. | 03-26-2015 |