Patent application number | Description | Published |
20080238236 | SWITCHED RELUCTANCE MACHINE - A switched reluctance machine is provided. The switched reluctance machine has a rotor including a rotor core, where the rotor core includes multiple laminated sheets, each of the laminated sheets including multiple ferromagnetic regions and multiple non-ferromagnetic regions formed of a single material. The ferromagnetic and the non-ferromagnetic regions are alternately arranged such that the ferromagnetic regions form multiple rotor teeth and the non-ferromagnetic regions define multiple non-ferromagnetic gaps between the rotor teeth. | 10-02-2008 |
20080296994 | SYNCHRONOUS RELUCTANCE MACHINE - A synchronous reluctance machine is provided. The synchronous reluctance machine includes a stator having a stator core, the stator core including a number of fractional-slot concentrated windings wound around multiple stator teeth. The synchronous reluctance machine also includes a rotor having a rotor core and disposed with an air gap inside and concentric with the stator, wherein the rotor core includes a number of laminated sheets, wherein each of the laminated sheets is axially skewed with respect to neighboring ones of the laminated sheets, and wherein each of the laminated sheets includes multiple ferromagnetic regions and multiple non-ferromagnetic regions formed of a single material. | 12-04-2008 |
20100090549 | THERMAL MANAGEMENT IN A FAULT TOLERANT PERMANENT MAGNET MACHINE - A PM machine is provided. The PM machine includes a stator including a stator core, wherein the stator core defines multiple step-shaped stator slots. The stator includes multiple fractional-slot concentrated windings wound within the step-shaped stator slots. The stator also includes at least one cooling tube disposed around the windings. The stator further includes a first insulation layer disposed around the cooling tube. The stator also includes a second insulation layer disposed around the first insulation layer. The stator further includes at least one slot wedge configured to close an opening of a respective one of the step-shaped stator slots, wherein the slot wedge is further configured to adjust a leakage inductance in the PM machine. The PM machine also includes a rotor having a rotor core and disposed outside and concentric with the stator, wherein the rotor core includes a laminated back iron structure disposed around multiple magnets. | 04-15-2010 |
20100090557 | FAULT TOLERANT PERMANENT MAGNET MACHINE - A PM machine is provided. The PM machine includes a stator including a stator core, wherein the stator core defines multiple step-shaped stator slots. The stator includes multiple fractional-slot concentrated windings wound within the step-shaped stator slots. The stator also includes at least one slot wedge configured to close an opening of a respective one of the step-shaped stator slots, wherein the slot wedge is further configured to adjust the leakage inductance in the PM machine. The PM machine also includes a rotor having a rotor core and disposed outside and concentric with the stator, wherein the rotor core includes a laminated back iron structure disposed around multiple axially-segmented magnets. | 04-15-2010 |
20100237723 | SYSTEM AND METHOD FOR THERMAL MANAGEMENT IN ELECTRICAL MACHINES - A cooling system for an electrical machine is provided. The cooling system includes at least one baffle enclosing multiple endwindings, wherein the at least one baffle is configured to guide a cooling fluid flow to multiple regions of interest in the machine. | 09-23-2010 |
20100243946 | METHODS OF MAKING HIGH RESISTIVITY MAGNETIC MATERIALS - A method to make a high resistivity permanent magnetic material comprising a non-conductive phase and a permanent magnetic phase microstructure, is disclosed. The method comprises the steps of, (a) disposing at least one layer comprising a non-conductive powder and at least one layer comprising a permanent magnetic powder adjacent to each other to obtain a multilayer, (b) compressing the multilayer, and (c) sintering the multilayer. A method to make a high resistivity soft magnetic material comprising a microstructure comprising a bulk metallic glass phase and a soft magnetic crystalline metal phase, is also disclosed. | 09-30-2010 |
20100244603 | ELECTRIC MACHINE - An electrical machine is disclosed. The electrical machine comprises a first discontinuous volume comprising a high resistivity soft magnetic material. | 09-30-2010 |
20100253169 | ELECTRIC MACHINE - An interior permanent magnet machine is disclosed. The machine comprises an air gap, and a rotor comprising a plurality of multilayered magnets each placed substantially along circumferential chords of the air gap, wherein each of the magnets comprises a plurality of segments and at least one segment adjacent said air gap comprises a high resistivity magnetic material. A method to make an interior permanent magnet machine is also disclosed. | 10-07-2010 |
20100253171 | ELECTRIC MACHINE - An interior permanent magnet electric machine is disclosed. The interior permanent magnet electric machine comprises a rotor comprising a plurality of radially placed magnets each having a proximal end and a distal end, wherein each magnet comprises a plurality of magnetic segments and at least one magnetic segment towards the distal end comprises a high resistivity magnetic material. | 10-07-2010 |
20100277017 | DOVETAIL SPOKE INTERNAL PERMANENT MAGNET MACHINE - An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple pair of permanent magnets for generating a magnetic field, which magnetic field interacts with the stator magnetic field to produce a torque. The multiple pair of permanent magnets are disposed between the stacks. The rotor assembly also includes multiple middle wedges mounted between each pair of the multiple permanent magnets. | 11-04-2010 |
20100277028 | HIGH SPEED INTERNAL PERMANENT MAGNET MACHINE - An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple permanent magnets for generating a magnetic field, which interacts with the stator magnetic field to produce torque. The permanent magnets are disposed between the stacks. The rotor assembly also includes multiple bottom wedges disposed on the bottom structures of the shaft and configured to hold the multiple stacks and the multiple permanent magnets. | 11-04-2010 |
20100289386 | COOLING SYSTEM FOR ROTATING MACHINE - An electrical machine comprising a rotor is presented. The electrical machine includes the rotor disposed on a rotatable shaft and defining a plurality of radial protrusions extending from the shaft up to a periphery of the rotor. The radial protrusions having cavities define a fluid path. A stationary shaft is disposed concentrically within the rotatable shaft wherein an annular space is formed between the stationary and rotatable shaft. A plurality of magnetic segments is disposed on the radial protrusions and the fluid path from within the stationary shaft into the annular space and extending through the cavities within the radial protrusions. | 11-18-2010 |
20110040495 | APPARATUS AND METHOD FOR BEARING CONDITION MONITORING - An electrical motor bearing condition monitoring system includes an assembly that includes a shaft, a first bearing race coupled to the shaft, a plurality of bearing balls, and a second bearing race coupled to the first bearing race via the plurality of bearing balls. A portion of the assembly has a magnetic field encoded thereon. The monitoring system includes a magnetic field sensor positioned proximately to the magnetized assembly and configured to measure the magnetic field, and a processing unit configured to detect changes in the magnetic field via the magnetic field sensor that occur due to passage of electrical current through the bearing balls. | 02-17-2011 |
20110050151 | SYSTEM AND METHOD FOR NON-SINUSOIDAL CURRENT WAVEFORM EXCITATION OF ELECTRICAL MACHINES - A system and method for exciting an electrical machine with instantaneous non-sinusoidal current waveforms is disclosed. The system includes an inverter that controls current flow and terminal voltages in an electrical machine and a controller programmed to input an initial sinusoidal current demand to the inverter, thereby causing the inverter to output an initial sinusoidal input current. The controller is further programmed to receive feedback on an air gap magnetic field in the electrical machine generated by the initial sinusoidal current demand, determine an instantaneous fundamental component and instantaneous harmonic components of the air gap magnetic field, apply a correction to the instantaneous fundamental component of the air gap magnetic field to generate an ideal fundamental component, generate a non-sinusoidal current demand based on the ideal fundamental component, and input the non-sinusoidal current demand to the inverter, thereby causing the inverter to output a non-sinusoidal current. | 03-03-2011 |
20110101818 | SEGMENTED STATOR ASSEMBLY - An electric machine and stator assembly are provided that include a continuous stator portion having stator teeth, and a tooth tip portion including tooth tips corresponding to the stator teeth of the continuous stator portion, respectively. The tooth tip portion is mounted onto the continuous stator portion. | 05-05-2011 |
20110221288 | SYSTEM AND METHOD FOR COOLING IN ELECTRIC MACHINES - A segmented cooling system for an electric machine is provided. The segmented cooling system includes multiple cooling subsystems coupled to respective multiple stator segments in the electric machine, wherein the multiple cooling subsystems directs fluid flow towards one or more regions of interest within the respective multiple stator segments. | 09-15-2011 |
20110266893 | SWITCHED RELUCTANCE MACHINE - A switched reluctance machine is provided. The switched reluctance machine has a rotor including a rotor core, where the rotor core includes multiple laminated sheets, each of the laminated sheets including multiple ferromagnetic regions and multiple non-ferromagnetic regions formed of a single material. The ferromagnetic and the non-ferromagnetic regions are alternately arranged such that the ferromagnetic regions form multiple rotor teeth and the non-ferromagnetic regions define multiple non-ferromagnetic gaps between the rotor teeth. | 11-03-2011 |
20110291516 | ELECTRIC MACHINE ROTOR BAR AND METHOD OF MAKING SAME - A method, system, and apparatus including an electric machine having a plurality of rotor bars and a first coupling component configured to electrically couple the plurality of rotor bars together. Each rotor bar of the plurality of rotor bars includes a first metallic material having a first electrical resistivity and a second metallic material cast about the first material, where the second metallic material has a second electrical resistivity greater than the first electrical resistivity. The first metallic material has a first end and a second end opposite the first end and the first coupling component is coupled to the first end of the first metallic material. | 12-01-2011 |
20110291599 | HIGH-SPEED SELF-CASCADED ELECTRIC MACHINE - An electric machine is disclosed comprising a first energy source, a second energy source, and a stator which comprises a first set of windings and a second set of windings. The electric machine has a rotor and a controller, the controller configured to control the first energy source to supply a first current to the first set of windings and control the second energy source to supply a second current to the second set of windings. The controller also detects an angular position of the rotor, detects the first current, detects the second current, and determines an optimum phase shift angle of the first current based on the angular position of the rotor, the first current, and the second current. The controller controls the first energy source based on the optimum phase shift angle to modify the first current supplied to the first set of windings. | 12-01-2011 |
20110320051 | SYSTEM AND METHOD FOR NON-SINUSOIDAL CURRENT WAVEFORM EXCITATION OF ELECTRICAL GENERATORS - An electrical generator includes a stator having fractional-slot concentrated windings and a rotor having field windings. A drive is provided having a circuit to control current flow to the field windings and a controller to input an initial DC field current demand to the circuit to cause the circuit to output an initial DC field current representative of a DC field current demand that would cause an electrical generator having sinusoidal stator windings to output a desired AC power. The controller receives feedback on the magnetic field generated by the initial DC field current, isolates an ideal fundamental component of the magnetic field based on the feedback and to generate a modified DC field current demand, and inputs the modified DC field current demand to the circuit, thereby causing the circuit to output an instantaneous non-sinusoidal current to the field windings to generate a sinusoidal rotating air gap magnetic field. | 12-29-2011 |
20120019083 | HIGH POWER-DENSITY, HIGH EFFICIENCY, NON-PERMANENT MAGNET ELECTRIC MACHINE - A system and method of manufacturing an electric machine comprising a rotor and a stator, wherein the stator comprises a fractional-slot concentrated winding having two sets of terminals, wherein a first set of terminals configures the fractional-slot concentrated winding to have a first pole-number (P | 01-26-2012 |
20120025638 | APPARATUS FOR COOLING AN ELECTRIC MACHINE - Provided is an apparatus, for example, for use with a rotating electric machine, that includes a housing. The housing can include a housing main portion and a housing end portion. The housing main portion can be configured to be disposed proximal to a body portion of a stator section of an electric machine. The housing main portion can define a main fluid channel that is configured to conduct fluid therethrough. The housing end portion can receive fluid from said main fluid channel and direct fluid into contact with a winding end portion of a conductive winding of the stator section. | 02-02-2012 |
20120074800 | Stator and Method of Assembly - The present application provides a stator. The stator may include a number of poles and a stator tip and cooling assembly. The stator tip and cooling assembly may include a number of stator tips with a number of cooling tubes adjacent thereto such that the stator tips align with the poles and the cooling tubes cool the poles. | 03-29-2012 |
20120126652 | Rotor Structure For A Fault-Tolerant Permanent Magnet Electromotive Machine - A rotor structure for a permanent magnet electromotive machine is provided. A back-core lamination is disposed around a plurality of permanent magnets. The back-core lamination comprises a plurality of high-reluctance regions arranged to attenuate asynchronous magnetic flux components while avoiding synchronous magnetic flux components. The asynchronous and synchronous magnetic flux components result from spatial harmonic components of a plurality of fractional-slot concentrated windings of a stator of the machine. | 05-24-2012 |
20120126728 | INTEGRATED ELECTRIC MACHINE AND SILICON CARBIDE POWER CONVERTER ASSEMBLY AND METHOD OF MAKING SAME - An electric drive system comprising an electric machine comprising a rotor and a stator, a power converter electrically coupled to the electric machine and configured to convert a DC link voltage to an AC output voltage to drive the electric machine, and a single cooling loop, wherein the electric machine and the power converter are integrated within the single cooling loop. | 05-24-2012 |
20120126733 | HIGH POWER-DENSITY, HIGH BACK EMF PERMANENT MAGNET MACHINE AND METHOD OF MAKING SAME - An electric drive system includes a permanent magnet machine having a rotor and a stator and a power converter electrically coupled to the permanent magnet machine and configured to convert a DC link voltage to an AC output voltage to drive the permanent magnet machine. The power converter includes a plurality of silicon carbide switching devices having a voltage rating that exceeds a peak line-to-line back electromotive force of the permanent magnet machine at a maximum speed of the permanent magnet machine. | 05-24-2012 |
20120126741 | LOW-INDUCTANCE, HIGH-EFFICIENCY INDUCTION MACHINE AND METHOD OF MAKING SAME - An electric drive system includes an induction machine and a power converter electrically coupled to the induction machine to drive the induction machine. The power converter comprising a plurality of silicon carbide (SiC) switching devices. The electric drive system further includes a controller that is electrically coupled to the power converter and that is programmed to transmit switching signals to the plurality of SiC switching devices at a given switching frequency such that a peak-to-peak current ripple is less than approximately five percent. | 05-24-2012 |
20120286618 | ELECTRIC MACHINE ROTOR BAR AND METHOD OF MAKING SAME - A method, system, and apparatus including an electric machine having a plurality of rotor bars and a first coupling component configured to electrically couple the plurality of rotor bars together. Each rotor bar of the plurality of rotor bars includes a first metallic material having a first electrical resistivity and a second metallic material cast about the first material, where the second metallic material has a second electrical resistivity greater than the first electrical resistivity. The first metallic material has a first end and a second end opposite the first end and the first coupling component is coupled to the first end of the first metallic material. | 11-15-2012 |
20120326652 | HIGH POWER-DENSITY, HIGH EFFICIENCY, NON-PERMANENT MAGNET ELECTRIC MACHINE - A system and method of manufacturing an electric machine comprising a rotor and a stator, wherein the stator comprises a fractional-slot concentrated winding having two sets of terminals, wherein a first set of terminals configures the fractional-slot concentrated winding to have a first pole-number (P | 12-27-2012 |
20130002064 | ELECTRICAL MACHINE - An apparatus, such as an electrical machine, is provided. The apparatus can include a rotor defining a rotor bore and a conduit disposed in and extending axially along the rotor bore. The conduit can have an annular conduit body defining a plurality of orifices disposed axially along the conduit and extending through the conduit body. The rotor can have an inner wall that at least partially defines the rotor bore. The orifices can extend through the conduit body along respective orifice directions, and the rotor and conduit can be configured to provide a line of sight along the orifice direction from the respective orifices to the inner wall. | 01-03-2013 |
20130049513 | ELECTRIC MACHINE - A permanent magnet machine includes a stator having a stator core, a plurality of stator teeth and plurality of stator windings coupled to the stator core. The stator is configured to generate a stator magnetic rotating field when the stator windings are excited with an electric current. The stator magnetic rotating field includes both synchronous sub-harmonic and super-harmonic components. The permanent magnet machine also includes a rotor that is disposed within the stator. The rotor includes a rotor core and a plurality of rotor magnets that are coupled to the rotor core. The rotor magnets are further configured to have a predefined orientation profile such that when the stator windings are excited with an electric current, sub-harmonic and super-harmonic magnetic rotating fields are generated in the rotor magnetic field. The stator sub-harmonic and super-harmonic magnetic rotating fields interact with the rotor sub-harmonic and super-harmonic magnetic rotating fields and produce an aiding torque on in the permanent magnet machine. | 02-28-2013 |
20140116286 | SENSORLESS ELECTRIC MACHINE - An electric machine that includes a rotor core made of magnetic steel; a stator configured with stationary windings therein; openings disposed within or on the rotor core; and a rotor circuit that is configured to introduce saliency based on an orientation of part of the rotor circuit in relationship to a pole location of the electric machine, where the rotor circuit is made of a conductive, non-magnetic material. A rotor component and various embodiments of electric machines are also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims. | 05-01-2014 |
20140239763 | DUAL MAGNETIC PHASE STATOR LAMINATIONS FOR STATOR PERMANENT MAGNET ELECTRIC MACHINES - A dual magnetic phase stator lamination for use in stator permanent magnet electric machines is disclosed. The permanent magnet electrical machine includes a rotor mounted for rotation about a central axis and a stator positioned about the rotor and comprising a plurality of stator laminations, wherein each of the stator laminations is composed of a dual magnetic phase material and includes a first stator lamination portion comprising a magnetic material and a second stator lamination portion comprising a non-magnetic material, the second stator lamination portion comprising an area positioned adjacent to each of a plurality of permanent magnets embedded in the stator lamination. The second stator lamination portion comprises a heat treated portion of the stator lamination, with the heat treating of the second stator lamination portion rendering the dual magnetic phase material of the stator lamination non-magnetic at the locations of the second stator lamination portion. | 08-28-2014 |
20140265708 | DUAL MAGNETIC PHASE ROTOR LAMINATIONS FOR INDUCTION MACHINES - A dual magnetic phase rotor lamination for use in induction machines is disclosed. A rotor assembly is provided that includes a rotor core and a plurality of rotor conductors mechanically coupled to the rotor core and positioned thereabout, with the plurality of rotor conductors positioned within slots formed in the rotor core. The rotor core comprises a plurality of rotor laminations that collectively form the rotor core, with each of the rotor laminations being composed of a dual magnetic phase material and including a first rotor lamination portion comprising a magnetic portion and a second rotor lamination portion comprising a non-magnetic portion, wherein the second rotor lamination portion comprises a treated portion of the rotor lamination that is rendered non-magnetic so as to adjust a leakage inductance of the induction machine. | 09-18-2014 |
20150028718 | SYSTEM AND METHOD FOR SMOOTHING A SALIENT ROTOR IN ELECTRICAL MACHINES - An electrical machine exhibiting reduced friction and windage losses is disclosed. The electrical machine includes a stator and a rotor assembly configured to rotate relative to the stator, wherein the rotor assembly comprises a rotor core including a plurality of salient rotor poles that are spaced apart from one another around an inner hub such that an interpolar gap is formed between each adjacent pair of salient rotor poles, with an opening being defined by the rotor core in each interpolar gap. Electrically non-conductive and non-magnetic inserts are positioned in the gaps formed between the salient rotor poles, with each of the inserts including a mating feature formed an axially inner edge thereof that is configured to mate with a respective opening being defined by the rotor core, so as to secure the insert to the rotor core against centrifugal force experienced during rotation of the rotor assembly. | 01-29-2015 |
20150035402 | SPOKE PERMANENT MAGNET MACHINE WITH REDUCED TORQUE RIPPLE AND METHOD OF MANUFACTURING THEREOF - An internal permanent magnet machine includes a rotor assembly having a shaft comprising a plurality of protrusions extending radially outward from a main shaft body and being formed circumferentially about the main shaft body and along an axial length of the main shaft body. A plurality of stacks of laminations are arranged circumferentially about the shaft to receive the plurality of protrusions therein, with each stack of laminations including a plurality of lamination groups arranged axially along a length of the shaft and with permanent magnets being disposed between the stacks of laminations. Each of the laminations includes a shaft protrusion cut formed therein to receive a respective shaft protrusion and, for each of the stacks of laminations, the shaft protrusion cuts formed in the laminations of a respective lamination group are angularly offset from the shaft protrusion cuts formed in the laminations in an adjacent lamination group. | 02-05-2015 |
20150069977 | SYSTEM AND METHOD FOR NON-SINUSOIDAL CURRENT WAVEFORM EXCITATION OF ELECTRICAL GENERATORS - An electrical generator includes a stator having fractional-slot concentrated windings and a rotor having field windings. A drive is provided having a circuit to control current flow to the field windings and a controller to input an initial DC field current demand to the circuit to cause the circuit to output an initial DC field current representative of a DC field current demand that would cause an electrical generator having sinusoidal stator windings to output a desired AC power. The controller receives feedback on the magnetic field generated by the initial DC field current, isolates an ideal fundamental component of the magnetic field based on the feedback and to generate a modified DC field current demand, and inputs the modified DC field current demand to the circuit, thereby causing the circuit to output an instantaneous non-sinusoidal current to the field windings to generate a sinusoidal rotating air gap magnetic field. | 03-12-2015 |
20150084471 | SENSORLESS ELECTRIC MACHINE - An electric machine that includes a rotor core made of magnetic steel; a stator configured with stationary windings therein; openings disposed within or on the rotor core; and a rotor circuit that is configured to introduce saliency based on an orientation of part of the rotor circuit in relationship to a pole location of the electric machine, where the rotor circuit is made of a conductive, non-magnetic material. A rotor component and various embodiments of electric machines are also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims. | 03-26-2015 |