Patent application number | Description | Published |
20080238217 | Fault-tolerant permanent magnet machine with reconfigurable flux paths in stator back iron - A permanent magnet (PM) machine has a fault condition mechanism disposed within a back iron of the stator portion, the mechanism operational to automatically reduce fault currents associated with the PM machine during a fault condition. The fault condition mechanism disposed within the stator back iron is reconfigurable to automatically reduce internal heat associated with the PM machine during a fault condition. A method of reconfiguring the PM machine upon detecting a fault condition includes the steps of 1) selecting the reconfigurable fault condition mechanism from a) a plurality of magnetically anisotropic rotatable cylinders, b) a plurality of ferrofluid-filled cavities, and c) a dual-phase material selectively embedded within the stator core; and 2) reconfiguring the fault condition mechanism to automatically reduce fault currents or internal heat associated with the PM machine upon detection of a fault condition. | 10-02-2008 |
20080238220 | Fault-tolerant permanent magnet machine with reconfigurable stator core slot flux paths - A permanent magnet (PM) machine has a reconfigurable fault condition mechanism disposed solely within a stator core portion, wherein the mechanism is automatically reconfigurable to reduce fault currents associated with the PM machine during a fault condition. The reconfigurable fault condition mechanism is automatically reconfigurable to also reduce internal heat associated with the PM machine during a fault condition. A method of reconfiguring the fault condition mechanism upon detection of a fault condition includes the steps of 1) selecting the reconfigurable fault condition mechanism from a) a plurality of rotatable magnetically anisotropic cylinders disposed within stator core slots, b) a plurality of ferrofluid-fillable cavities associated with stator core slots, and c) a sliding shield within the stator core; and 2) reconfiguring the fault condition mechanism to automatically reduce fault currents associated with the PM machine upon detection of a fault condition. | 10-02-2008 |
20080238233 | Fault-tolerant permanent magnet machine with reconfigurable stator core slot opening and back iron flux paths - A permanent magnet (PM) machine includes a plurality of reconfigurable fault condition mechanisms disposed within a stator core portion, the plurality of reconfigurable fault condition mechanisms together automatically reconfigurable to reduce fault currents and internal heat associated with the PM machine during a fault condition. The plurality of reconfigurable fault condition mechanisms are disposed solely within the stator core portion according to one embodiment to automatically reduce stator winding fault currents and internal heat associated with the PM machine during a fault condition. A method of reconfiguring the fault condition mechanisms upon detecting a fault condition includes the steps of 1) selecting the plurality of reconfigurable fault condition mechanisms from a) a plurality of rotatable magnetically anisotropic cylinders disposed both within a stator back iron and stator slot openings, and b) a plurality of rotatable magnetically anisotropic cylinders disposed within a stator back iron and a sliding shield disposed with a stator slot opening portion of the stator core, and 2) reconfiguring the plurality of fault condition mechanisms together to automatically reduce fault currents associated with the PM machine upon detection of a fault condition. | 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 |
20100199488 | METHOD FOR MANUFACTURING A ROTOR FOR AN ELECTRIC MACHINE - An electrical machine includes a stator and a rotor. The stator has a central opening that is configured to receive the rotor. The rotor includes a generally cylindrical first section comprising a first material mounted on an axially extending shaft within the central opening. The rotor further includes a second section having a second material of a predetermined thickness that is plated integrally over at least a portion of the first section. The second material has a higher electrical conductivity relative to the first material. | 08-12-2010 |
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 |
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 |
20110006755 | HIGH SENSITIVITY DIFFERENTIAL CURRENT TRANSFORMER FOR INSULATION HEALTH MONITORING - A current transformer is provided. The current transformer comprises an inner magnetic core having a central opening, an outer sense core circumscribing the inner magnetic core, at least one pair of conductors extending through the central opening and positioned symmetrically with respect to a center point of the inner magnetic core, and one or more coils disposed on the inner magnetic core, the outer sense core, or both, in a magnetically balanced configuration relative to a magnetic neutral axis of the inner magnetic core. | 01-13-2011 |
20110006802 | HIGH SENSITIVITY DIFFERENTIAL CURRENT TRANSFORMER FOR INSULATION HEALTH MONITORING - A current transformer is provided. The current transformer comprises a magnetic core having a central opening, at least one pair of conductors extending through the central opening and positioned symmetrically with respect to a center point of the magnetic core, one or more coils disposed on the magnetic core along a magnetic neutral axis of the magnetic core and one or more coils disposed on the magnetic core along a reference axis, wherein the reference axis is substantially perpendicular to the magnetic neutral axis. | 01-13-2011 |
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 |
20110315257 | LINEAR HOLLOW SPOOL VALVE - A valve system for pressure exchanger tubes of an energy recovery system is provided. The valve system includes a valve housing, a flow distributor, a hollow spool and a sealing system. The valve housing may comprise a set of high-pressure ports and a set of low-pressure ports. The flow distributor allows the flow to and from the set of high-pressure ports and the set of low-pressure ports within the valve housing. The hollow spool may be configured to reciprocate axially in a radial clearance between the valve housing and the flow distributor. The hollow spool may connect the pressure exchanger tube in fluid communication with the high-pressure ports or the low-pressure ports. The sealing system may be provided within the valve housing for imparting substantial hydraulic balance to the hollow spool. | 12-29-2011 |
20120161570 | ELECTRIC MOTOR STRUCTURE TO MINIMIZE ELECTRO-MAGNETIC INTERFERENCE - An electric motor is configured with a stator core assembly that includes a stator core having a plurality of winding slots. A plurality of stator windings pass through the plurality of winding slots that include slot liners configured to provide electrostatic shields surrounding the plurality of stator windings. The electrostatic shields are referenced to an electrical location to reduce common mode currents associated with the electric motor | 06-28-2012 |
20120277926 | TRANSFORMER STRUCTURE FOR SMART LOAD BALANCING - A load balancing system includes a transformer having a plurality of integrated sensors. A control system that may be embedded within the transformer is in electrical communication with the plurality of sensors. The control system is configured to estimate or determine the state of health of the transformer. The state of health of the transformer is based upon signals generated via the plurality of sensors. A load request that may be received that is compared to the state of health of the transformer to determine if the transformer can support the load request. The control system determines whether or not the transformer can provide electrical power based upon the estimated state of health of the transformer and in response to the load request. | 11-01-2012 |
20120282120 | ELECTRIC CABLE, ELECTRIC MOTOR AND ELECTRIC SUBMERSIBLE PUMP - In accordance with one aspect of the present invention, an electric motor is provided that includes a housing, a stator, and a rotor, wherein the stator and rotor are disposed within the housing. The housing, the stator, and the rotor define an internal volume within the housing, said internal volume configured to receive a dielectric fluid. The electric motor further includes at least one electric cable configured to electrically power the electric motor, wherein the electric cable includes at least one electrical conductor disposed within at least one protective layer, and wherein the electrical conductor and the protective layer define at least one channel configured to deliver the dielectric fluid to the internal volume. An electric submersible pump system is also provided. | 11-08-2012 |
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 |
20130049733 | FAULT DETECTION BASED ON CURRENT SIGNATURE ANALYSIS FOR A GENERATOR - A method of detecting faults in a wind turbine generator based on current signature analysis is disclosed herein. The method includes acquiring a set of electrical signals representative of an operating condition of a generator. Further, the electrical signals are processed to generate a normalized spectrum of electrical signals. A fault related to a gearbox or bearing or any other component associated with the generator is detected based on analyzing the current spectrum. | 02-28-2013 |
20130195695 | HOLLOW ROTOR MOTOR AND SYSTEMS COMPRISING THE SAME - In one or more embodiments, the present invention provides electric motors and related systems comprising (a) a motor housing; and (b) a hollow rotor configured to rotate within and be driven by a stator contained within the motor housing; wherein the motor housing is characterized by a largest cross-sectional area of the motor housing, and wherein the hollow rotor defines a flow channel characterized by a smallest cross-sectional area of the flow channel, wherein the smallest cross-sectional area of the flow channel is at least 25% of the largest cross-sectional area of the motor housing, and wherein the hollow rotor has a first end portion defining a fluid inlet, and a second end portion defining a fluid outlet; the fluid inlet, the flow channel and the fluid outlet being configured to allow passage of a fluid from the fluid inlet to the fluid outlet via the flow channel. | 08-01-2013 |
20130207391 | VARIABLE SPEED ELECTRIC MACHINE AND METHOD FOR GENERATING ELECTRIC ENERGY - A variable speed electric machine and a method for generating electric energy is provided. The electric machine includes an outer stator with a first set of field windings. Further, the electric machine includes a modulator outer rotor that is concentric and is located proximate to the outer stator. The modulator outer rotor is operatively coupled to an input shaft. Furthermore the electric machine includes a permanent magnet inner rotor concentric to the modulator outer rotor. The electric machine also includes an inner stator with a second set of field windings. The inner stator is concentric to the inner rotor and is operatively coupled to an electric grid. The outer stator, the modulator outer rotor, inner stator and the inner rotor are magnetically coupled with each other so as to maintain a constant electric frequency at the inner stator. | 08-15-2013 |
20130234722 | HIGH SENSITIVITY DIFFERENTIAL CURRENT TRANSFORMER FOR INSULATION HEALTH MONITORING - A current transformer is provided. The current transformer comprises an inner magnetic core having a central opening, an outer sense core circumscribing the inner magnetic core, at least one pair of conductors extending through the central opening and positioned symmetrically with respect to a center point of the inner magnetic core, and one or more coils disposed on the inner magnetic core, the outer sense core, or both, in a magnetically balanced configuration relative to a magnetic neutral axis of the inner magnetic core | 09-12-2013 |
20130257188 | FLUX-SWITCHING ELECTRIC MACHINE - A flux-switching electric machine includes a rotor having a rotor core that is configured to rotate about a central longitudinal axis. The rotor core has a circumference that includes an approximately constant radius of curvature along an arc length of the rotor core. The rotor core includes magnetic and non-magnetic segments that are arranged in an alternating pattern of magnetic segments and non-magnetic segments along the arc length of the rotor core. The flux-switching electric machine also includes a stator having a stator core that extends a length along the central longitudinal axis. The stator core includes a stator base and stator teeth that extend radially from the stator base relative to the central longitudinal axis. The stator includes a direct current (DC) field coil wound around at least one corresponding stator tooth. The stator includes an alternating current (AC) armature coil wound around at least one corresponding stator tooth. The DC field coil overlaps the AC armature coil along an arc length of the stator core. | 10-03-2013 |
20130308361 | TRANSFORMER TAP-CHANGING CIRCUIT AND METHOD OF MAKING SAME - A transformer tap-changing circuit comprises an apparatus that includes a transformer comprising a secondary winding configured to inductively couple to a primary winding when a current is passed through the primary winding from an energy source, a first rectifier coupled to the secondary winding and configured to rectify a first AC voltage from the secondary winding into a first DC voltage, and a second rectifier coupled to the secondary winding and configured to rectify a second AC voltage from the secondary winding into a second DC voltage. The apparatus also includes a DC bus coupled to the first and second rectifiers and configured to receive the first and second DC voltages therefrom, wherein the first AC voltage is higher than the second AC voltage, and wherein the first DC voltage is higher than the second DC voltage. | 11-21-2013 |
20140001893 | ELECTRIC MACHINE AND SYSTEMS COMPRISING THE SAME | 01-02-2014 |
20140035595 | ON-LINE MONITORING SYSTEM FOR USE WITH ELECTRICAL ASSETS AND METHOD OF OPERATING THE SAME - A system configured to monitor an operating electrical device includes a testing channel coupled to the device. The device is coupled to an electric power source through at least one electric power transmission channel. The power source is configured to transmit electric power at a first frequency. The testing channel is coupled to the power transmission channel. The system also includes a signal generator coupled to the testing channel. The signal generator is configured to inject testing signals into the testing channel at a second frequency that is greater than the first frequency. The system further includes at least one apparatus magnetically coupled to the power transmission channel. The magnetically coupled apparatus is configured to present a first impedance to the electric power at the first frequency and present a second impedance to the test signals at the second frequency. The second impedance is greater than the first impedance. | 02-06-2014 |
20140055225 | LOAD TAP CHANGER - A load tap changer includes a mechanical switch, a semiconductor switch and an impedance branch or an uncontrolled semiconductor switch. The mechanical switch is connected to a power terminal of a voltage conversion device to carry an electric current and is activated to switch from a first tap to a second tap of the voltage conversion device when a tap change signal is received. The semiconductor switch is then connected between the first tap and the power terminal of the voltage conversion device when the tap change signal is received and is disconnected before the mechanical switch is connected to the second tap. The impedance branch or the uncontrolled semiconductor switch is connected between the second tap and the power terminal of the voltage conversion device before the mechanical switch is connected to the second tap. The impedance or the uncontrolled semiconductor switch is disconnected after the mechanical switch is connected to the second tap. | 02-27-2014 |
20140084937 | On-Line Monitoring of Stator Insulation in Motors and Generators - Systems and methods are disclosed for on-line monitoring of the condition of the stator insulation of an AC motor or an electric generator. In certain embodiments, the system includes a transformer surrounding each pair of input and output cables associated with a given phase of power provided to the AC motor or generated by the electric generator. In another embodiment, a transformer surrounds the three input cables (for an AC motor) or the three output cables (for an electric generator) that correspond to phases of the AC motor or electric generator. In both embodiments, the transformers generate voltages that may be used to monitor leakage currents associated with the cables. A microcontroller monitors the voltages generated by the transformers and determines the condition of the stator insulation of the AC motor or the electric generator based on the voltages. | 03-27-2014 |
20140133185 | POWER QUALITY CONTROL - An integrated power quality control system includes a transformer with a primary winding, a secondary winding and a compensation winding wound on a magnetic core. A power electronic converter in the system provides a reference voltage to the compensation winding for injecting a series voltage in the secondary winding of the transformer. A controller is utilized to generate the reference voltage for the power electronic converter based on a power quality control requirement. | 05-15-2014 |
20140266556 | CORE TUBE FOR A TRANSFORMER AND AN ASSOCIATED METHOD THEREOF - A core tube for a transformer is disclosed. The core tube includes a first half portion and a second half portion. The first half portion includes a first side portion, a first joining portion, and a second side portion. The first side portion is coupled to the second side portion via the first joining portion. The first side portion is longer than the second side portion or vice versa. The second half portion includes a third side portion, a second joining portion, and a fourth side portion. The third side portion is coupled to the fourth side portion via the second joining portion. The third side portion is longer than the fourth side portion or vice versa. The first half portion is coupled to the second half portion in an interleaved manner. | 09-18-2014 |
20150069879 | ELECTRIC MACHINE HAVING REDUCED TORQUE OSCILLATIONS AND AXIAL THRUST - A component that includes a longitudinal axle, having a multiple keybars that extend outward from a surface of the axle, such that each of the keybars are disposed axially along and circumferentially around the axle. Also the axis of the keybars is parallel to the axle, such that a profile of all midpoints of the keybars is helicoidal around the axle, also the helicoidal profile is such that they make up one or more helicoidal paths. The profile may be herringbone skewed. The component may be part of a rotor assembly that is part of an electric machine such as an interior permanent magnet (IPM) or Synchronous Reluctance motor. | 03-12-2015 |