Patent application number | Description | Published |
20080224551 | Cooling an Electrical Machine - An electrical machine includes a stator and a rotor disposed in a housing of the electrical machine. The stator includes windings having a first set of end turns at a first end of the stator and having a second set of end turns at a second, opposing end of the stator. The stator has a substantially tubular shape and an interior lateral surface. The rotor extends through the interior of the stator. A flow inlet into a volume in the housing about the first end turns is located radially outside of the interior lateral surface of the stator. A flow outlet from the volume in the housing about the first end turns is located radially outside of the interior lateral surface. The inlet and the outlet are cooperatively arranged to communicate a flow of fluid substantially transverse across the first end of the stator. | 09-18-2008 |
20080238234 | Segmented permanent magnet rotor for high speed synchronous machines - The segmented permanent-magnet rotor for high-speed synchronous machines reduces eddy-current losses by axially segmenting the containment sleeve and the permanent magnets. The axial segmentation of the containment sleeve includes forming grooves circumferentially around the outer surface of the containment sleeve. The circumferential grooves disrupt the generation of eddy currents on the outer surface of the containment sleeve and therefore reduce eddy-current losses in the containment sleeve. Axial segmentation of the permanent magnets also disrupts eddy current formation, thereby reducing eddy current losses in the permanent magnets. In addition, the presence of an electrically insulating layer between the containment sleeve and the permanent magnets reduces eddy current migration from the containment sleeve to the permanent magnets, and therefore provides additional reduction of eddy-current losses. | 10-02-2008 |
20090200809 | RECONFIGURABLE POWER SYSTEM USING MULTIPLE PHASE-SET ELECTRIC MACHINES - A reconfigurable power system that includes a gas turbine, flywheel, a first electric machine coupled to the gas turbine, a second electric machine coupled to the flywheel, the first and second electric machines being substantially similar in configuration, a first power device for coupling power from the first electric machine to a power grid, a second power device coupled to the second electric machine for driving the flywheel and coupling power from the second electric machine to the power grid, and a switch for coupling either the power generated by the first electric machine or the second electric machine to the grid. | 08-13-2009 |
20090218977 | Electric drive system with redundancy - Circuit configurations for controlling an AC motor drive system wherein the control systems include redundancy features to compensate for possible failed system components. | 09-03-2009 |
20100019589 | SLOT CONFIGURATION OF AN ELECTRIC MACHINE - A stator includes an elongate core defining an inner volume to receive a rotor of an electric machine. The core includes a yoke and an array of teeth extending from the yoke toward the inner volume. The array of teeth defines slots between each pair of adjacent teeth in the array. Each slot includes a first slot region adapted to hold at least a portion of a conductive winding and a second slot region adapted to hold at least a portion of a conductive winding. The first slot region is defined by two non-parallel opposing slot side portions, and the second slot region is defined by two parallel opposing slot side portions. | 01-28-2010 |
20100019590 | ELECTRIC MACHINE - An electric machine system includes an electric machine and a companion device. The electric machine has a stationary member and a movable member that, by interaction of magnetic fields, at least one of moves relative to the stationary member or generates electricity when moved relative to the stationary member. One of the stationary member and the movable member includes a permanent magnet. The companion device is coupled to the electric machine to communicate mechanical movement with the movable member. In certain instances, the electric machine system has adaptations for operation of the electric machine system subsea and/or in a corrosive environment. | 01-28-2010 |
20100019598 | ROTOR FOR AN ELECTRIC MACHINE - A multi-pole rotor for an electric machine including a rotor hub, a plurality of primary permanent magnet segments, each primary magnet segment having a rounded outer face and forming a section of a cylindrical outer surface of the rotor when mounted to the rotor hub. A plurality of interpole permanent magnet segments are also included, each interpole magnet segment having a rounded outer face and forming a section of a cylindrical outer surface of the rotor when mounted to the rotor hub. The primary magnet segments and interpole magnet segments defining two or more poles. | 01-28-2010 |
20100019599 | ROTOR FOR AN ELECTRIC MACHINE - A rotor for an electric machine can be constructed with magnet segments having a uniformly oriented direction vector component. In certain instances, a two-pole rotor includes a rotor hub and a plurality of permanent magnet segments affixed to a perimeter of the rotor hub. The magnetic segments defining a substantially cylindrical outer surface of the rotor. The magnet segments each have a magnetic field with a direction vector component, and the direction vector components of the magnet segments affixed to the perimeter of the rotor hub are substantially parallel and oriented in substantially the same direction. | 01-28-2010 |
20100019600 | THERMALLY MATCHED COMPOSITE SLEEVE - A sleeve about an electric machine rotor core and the plurality of permanent magnets has a fiber-reinforced composite layer about the rotor core and the plurality of permanent magnets. At least a portion of the sleeve about the rotor core and the permanent magnets has a coefficient of thermal expansion that is substantially equal to the aggregate coefficient of thermal expansion of the rotor core and the plurality of permanent magnets. | 01-28-2010 |
20100019601 | WRAPPED ROTOR SLEEVE FOR AN ELECTRIC MACHINE - A rotor for an electric machine may include a rotor hub, a plurality of permanent magnets disposed about the rotor hub, a first sleeve circumjacent the plurality of permanent magnets, and a second sleeve. The second sleeve may be formed from a metal tape wrapped over the first sleeve. The second sleeve may be bonded to first and second end rings disposed at adjacent ends of the rotor hub. The metal tape may be applied in tension and may wrapped to form butt laps over the first sleeve. The metal tape may be corrosion resistant. Further, the second sleeve formed from the metal tape may protect the rotor from erosion and abrasion from fluid passing over the rotor. | 01-28-2010 |
20100019602 | ROTOR FOR ELECTRIC MACHINE HAVING A SLEEVE WITH SEGMENTED LAYERS - A rotor for an electrical machine includes an elongate rotor core assembly comprising a rotor core and a plurality of permanent magnets arranged in a plurality of rings around the rotor core. A composite sleeve resides around the rotor core assembly. The sleeve includes a primarily axially-oriented outer layer and an intermediate layer beneath the outer layer. The intermediate layer includes a circumferential band of composite material positioned orthogonal to a longitudinal axis of the rotor core assembly. | 01-28-2010 |
20100019603 | ROTOR FOR AN ELECTRIC MACHINE - A rotor for an electrical machine includes a rotor hub and a plurality of permanent magnet segments affixed around a perimeter of the rotor hub. A first plurality of the permanent magnet segments have a substantially uniform arcuate span and are formed of a single unitary piece of material. A multi-piece permanent magnet segment includes at least two pieces, each having a smaller arcuate span than the first plurality of segments. The magnetization direction vector of one piece different than the magnetization direction vector of at least one other piece in each multi-piece segment. | 01-28-2010 |
20100019609 | END TURN CONFIGURATION OF AN ELECTRIC MACHINE - A stator for an electric machine includes multiple conductive coils. Each coil defines a loop that extends axially through the elongate core, exits the core through an end face, and reenters the core through the end face. A first subset of the coils collectively form a first radial layer axially exterior the core and a third radial layer axially exterior the core. Each coil in the first subset resides in both the first layer and the third layer. A second subset of the coils collectively forms a second radial layer axially exterior the core and a fourth radial layer axially exterior the core. Each coil in the second subset residing in both the second layer and the fourth layer. | 01-28-2010 |
20100019610 | HYBRID WINDING CONFIGURATION OF AN ELECTRIC MACHINE - An electric machine system includes an electric machine and a companion device. The electric machine has a stationary member and a movable member that, by interaction of magnetic fields, at least one of moves relative to the stationary member or generates electricity when moved relative to the stationary member. One of the stationary member and the movable member comprising a permanent magnet. The companion device is coupled to the electric machine to communicate mechanical movement with the movable member. In certain instances, the electric machine system has adaptations for operation of the electric machine system subsea and/or in a corrosive environment. The electric machine includes a stator that carries a conductive winding having multiple coils. A first subset of the coils are in a first configuration, and a second subset of the coils are in a second configuration. In some implementations, the first configuration is a lap winding configuration, and the second configuration is a concentric winding configuration. | 01-28-2010 |
20100019613 | STATOR FOR AN ELECTRIC MACHINE - A stator core for a stator of an electrical machine includes an elongate stator yoke having an interior surface that defines an axial central opening through the stator yoke. The interior surface further defines a plurality of axial channels about a perimeter of the central opening. A plurality of stator teeth are retained in the plurality of axial channels and spaced apart from one another to define to define axial channels to receive windings of the stator. | 01-28-2010 |
20100019626 | STATOR WEDGE FOR AN ELECTRIC MACHINE - Electric machines with, and related methods for, improved fluid flow through the electric machines are disclosed. According to some implementations, an electric machine may include a central opening and a plurality of teeth facing inwardly toward the central opening. Slots may be defined between adjacent teeth, and a wedge may be disposed in one or more of the slots, partitioning the slots into a coils portion and an open portion. A gap may be defined between the stator core and the rotor. A fluid flow path defined from the gap and the open portions of the slots provide for improved fluid flow through the electric machine. Wedges disposed in the slots to maintain the coils into a packed state. | 01-28-2010 |
20100171383 | ROTOR FOR ELECTRIC MACHINE HAVING A SLEEVE WITH SEGMENTED LAYERS - An electric machine system includes an electric machine and a companion device. The electric machine has a stationary member and a movable member that, by interaction of magnetic fields, at least one of moves relative to the stationary member or generates electricity when moved relative to the stationary member. One of the stationary member and the movable member includes a permanent magnet. The companion device is coupled to the electric machine to communicate mechanical movement with the movable member. In certain instances, the electric machine system has adaptations for operation of the electric machine system subsea and/or in a corrosive environment. | 07-08-2010 |
20100244599 | ELECTROMECHANICAL ENERGY CONVERSION SYSTEMS - An exemplary power system may include an electric machine with multiple sets of stator windings, each set of windings being coupled through a separate switch matrix to a common voltage bus, and each of which may be spatially arranged in full pitch around the stator such that stator flux harmonics are substantially reduced. The reduced stator flux harmonics may be associated with phase current harmonic content. In an example application, such power systems may operate in a generating mode to transfer mechanical energy to electrical energy on a DC voltage bus. In some illustrative embodiments, the power system may provide both high-power and high-speed (e.g., 1MW at 8000 rpm or above) motoring and/or generating capability suitable, for example, for on-board (e.g., marine, aviation, traction) power systems. | 09-30-2010 |