Abstract: A wind power installation having external and/or internal redundancy derived by multiple, independent power generating systems arranged in parallel, but switchably interconnected to allow substantial continued operation in the event of a critical component failure.

Abstract: A structure of a rotor used in a synchronous motor employing both of permanent magnets and a stator using concentrated windings is disclosed. Slits (13) provided in a section of a rotor laminated in a direction of a rotary shaft are shaped like an arc or a bow, and the shape protrudes toward an outside rim of rotor (12). Permanent magnets (14) are inserted into slits (13). This structure produces less magnetic salient poles than a conventional rotor, so that a magnetic flux density can be lowered, and an efficient motor with less loss is obtainable.

Abstract: In a unipolar transverse flux machine, to attain a modular structure favorable in terms of production, the stator and the rotor each have the same number of identical stator modules and rotor modules. Each stator module includes an annular coil, disposed coaxially to the rotor shaft, and U-shaped stator yokes fitting over the annular coil. To achieve a high static torque, each rotor module comprises two rotor rings with external toothing, and the rotor rings surround two radially oppositely magnetized permanent magnet rings, which in turn are seated on a common flux-conducting element, which is formed for instance by the rotor shaft produced from ferromagnetic material.

Abstract: An alternator for an automotive vehicle is substantially composed of a housing, a rotor having a field coil and a stator having stator coils. A cooling fan is connected to an axial end of the rotor. The stator is fixedly disposed in the housing and the rotor is rotatably supported in the housing. According to rotation of the rotor, alternating current is generated in the stator coils, and the alternating current is rectified into direct current to charge an on-board battery. Inlet ports for introducing cooling air into the housing are formed between spokes formed on an axial end wall of the housing. The spokes are slanted in the direction opposite to the rotational direction of the rotor relative to the radial direction to thereby reduce airflow noise generated around the spokes.

Abstract: An object of the present invention is to provide an automotive alternator achieving high output by overlapping a laminated core of a stator and yoke portions of a field rotor in an axial direction, and enabling high-speed and low-speed electromagnetic noise to be reduced by prescribing dimensional relationships in the stator and the field rotor. In this automotive alternator, a ratio (R2/R1) between an outer radius R2 of a cylindrical portion of a Lundell-type core and an outer radius R1 of the Lundell-type core is set to a range from 0.50 to 0.54, and a ratio (Lc/Lp) between an axial length Lc of the laminated core and an axial length Lp of the Lundell-type core is set to a range from 0.55 to 0.70.

Abstract: It is sought to insulate a stator body and lead lines of coils from one another and provide a coil wiring member for a movable magnet type linear motor, which provides for good operability of interconnecting the lead lines and inexpensive in price. In a movable magnet type linear motor comprising a stator having coils and a mover mainly having permanent magnets and movable in the longitudinal direction of the stator, a coil wiring member according to the invention is made of a non-conductive material, has a gutter-like shape open at the top and is fitted in a groove formed in the stator body such as to cover the inner groove surfaces.

Abstract: The present invention provides a metal bushing motor to fix a fan. The fan includes a frame body, a circuit board disposed on the frame body, a stator assembly mounted on the frame body, and a rotor assembly set on the outside of the stator assembly. A loading base is disposed in the center of the frame body and a bearing is disposed on the base. The bearing on the loading base is composed of a connection part and a hollow tube. At least one joint part is disposed on outer circumference of the connection part. A lower bobbin is mounted on the button of the stator assembly. A hole is in the center of the lower bobbin and at least one obstructer corresponding to the joint part mounted on the bearing is disposed on inner circumference of the hole. By the lower bobbin, the stator assembly is firmly mounted on the bearing of the base, rather than get loose or fall off to interrupt the rotation operation of the fan while being forced or operated for a certain period.

Abstract: A casing for a heat-dissipating fan includes an annular wall and a base. The annular wall includes an air inlet in a first end thereof and an air outlet in a second end thereof. The base is securely mounted in the air inlet of the base, with a plurality of ribs extending between the annular wall and the base. A plurality of mounting portions are provided between the annular wall and the base to allow the heat-dissipating fan to be fixed to an object. Since the mounting portions are located inside the annular wall, minimization of the casing is realized.

Abstract: A spindle motor using a hydraulic bearing is provided, wherein an R-face or C-face is formed on each of upper and lower edges of an outer periphery of a rotating disk portion rotatable integrally with a spindle, and the R-face or C-face is formed into a mirror-finished surface having a surface roughness of 0.3 s or less in Ra, preferably, 0.1 s or less in Ra. Alternatively, a recess may be formed in a portion, facing to each of the upper and lower edges of the outer periphery of the rotating disk portion, of an inner wall surface of the hydraulic bearing. Such a spindle motor provides a disk drive capable of suppressing a variation in rotational speed of the spindle motor caused by tilting of the spindle due to vibration and impact, thereby ensuring a stable recording or reproducing operation.

Abstract: Disclosed is an iron core type linear motor, and more particularly an iron core type linear motor with an improved cooling system for an easy manufacture thereof while having a high cooling efficiency. The iron core type linear motor includes a moving part including a core, a coil, and an upper plate, and a stator including magnets, and a magnet fixing plate. The iron core type linear motor according to the present invention is characterized by a cooling system including a lower cooling conduit, a thermal insulating plate, and an upper cooling conduit laminated over one another in this order between the core and the upper plate.

Abstract: An improved wave energy converter for use in offshore and deep-sea locations. The wave energy converter is adapted for secure attachment to the bottom of a body of water (e.g., the ocean floor), preferably beyond the breaker zone. The wave energy converter is selectively adjustable in length. A hydraulic power generation system is used to convert the energy present in the waves into hydraulic power that can be use to generate electricity and for other purposes, such as desalinization. The system may include a hydraulic piston assembly, a floatation device that is connected to the piston assembly, high and low pressure hydraulic reservoirs, and a hydraulically driven power generator. The floatation device moves upward in response to rising waves, and downward under the force of gravity in response to falling waves. The system utilizes this downward gravitational force to discharge fluid from the piston assembly, which in turn, drives the power generator.

Abstract: The electric motor with permanent-magnet excitation has a stator (1), a rotor (7) supported inside the stator and adjacent permanent magnets (8, 9, 10, 11) of opposite polarity arranged next to each other on a rotor surface facing the stator. The rotor (7) has cavities (16, 17, 18, 19) arranged within a rotor interior and indentations (12, 13, 14, 15) in the rotor surface, which are arranged so that radially oriented magnetic flux lines are not interrupted by the cavities and indentations, but magnetic flux lines oriented tangentially to the rotor surface are interrupted by the cavities and indentations so that a magnetic short circuit is formed. These indentations and cavities reduce the rotor heat capacity so that a layer of a magnetic material that forms the permanent magnets (8, 9, 10, 11) can be sprayed onto the rotor surface.

Abstract: Permanent magnets are arranged to be supported by the provision of permanent magnet position-locating projections (12) in permanent magnet embedding holes (5). By optimizing the shape of thin-wall regions (18) and (19) within rotor core (4), leakage of flux generated from the permanent magnets is reduced and the strength of the thin-wall regions where stress is concentrated is ensured.

Abstract: A turbine has a first rotating portion configured to rotate about an axis and a second rotating portion configured to rotate about the same axis. The first rotating portion has a plurality of first fluid outlets, and, the second rotating portion has a plurality of second fluid outlets proximate to the first fluid outlets. The outlets are configured so that when a fluid flows out the first fluid outlets, the first rotating portion rotates in a first sense, and the fluid is forced out the second fluid outlets, thereby causing the second rotating portion to rotate in a sense opposite to the first sense. The first and second rotating portions may be connected to drive an electrical generator. The generator and the rotating portions may all be configured to rotate about a single axis, and may all be supported by bearings.

Abstract: Spindle motor utilizing a dynamic-pressure bearing device having a full-fill structure and capable of discharging air bubbles from the lubricating oil after it is charged into the bearing device, as well as air bubbles appearing in the oil due to cavitation in handling. Thrust and radial bearing sections are configured within bearing clearances in between the rotor, the shaft, and a shaft-encompassing hollow bearing member. A communicating passage enabling the oil to redistribute itself within the bearing clearances is formed in the bearing member. At least one ray-like groove that reaches from the radially inward edge of dynamic-pressure-generating grooves in the thrust bearing section to the rim of the shaft-encompassing hollow is furnished in the bearing member. When the motor rotates the air bubbles are stirred and minced by the ray-like groove, and migrate toward release at the single oil-air interface.

Abstract: A stator tooth design for a stator core of a permanent magnet motor. The tooth surface comprises a plurality of surface segments, wherein each surface segment of the plurality of surface segments joins an adjacent surface segment of the plurality of surface segments at an obtuse angle, preferably between 160 and 170 degrees. Alternatively, the tooth surface comprises a single essentially straight surface segment. Each of the plurality of surface segments has a starting edge and an ending edge. Preferably, the starting edge of a surface segment lies along a first circumferential path a predetermined radial distance from the outside edge of the stator core and the ending edge of the surface segment lies along a second circumferential path either closer to or further from the outside edge. The first circumferential path and the second circumferential path can be concentric to the outside edge of the stator core.

Abstract: An improved apparatus and method of having a pair of end caps on a rotor assembly of a multi-pole high-speed generator is provided for use with a turbine engine. The rotor assembly provides improved balancing and/or cooling during generator operation. The rotor assembly includes a plurality of poles and at least one support wedge positioned between each of the poles. The rotor assembly is mounted on a shaft. An annular flange of the end caps restrains the support wedges in the rotor assembly for improved balancing and maintaining concentricity. The end caps may also include a manifold for circulating a cooling medium through the shaft to and from the support wedges to cool the generator.

Abstract: In a stator winding bar for an electrical machine without end winding transposition and with transposition in the active part of 450°, the middle part of the active part, in order to compensate the external fields acting in the region of the end windings and inducing circulating currents, has a length that is greater than ¾ of the total length of the active part.

Abstract: An active magnetic thrust bearing, acting on only a single axial side of a rotor, while also having an efficient permanent magnet bias for linearized and highly amplified control, uses two concentric ring poles that axially face a ferromagnetic axial surface of the rotor, creating two annular axial air gaps. A permanent magnet in the stator drives a bias flux through a first path including two radially spaced concentric ring poles and their air gaps, and an annular region of the rotor axially aligned between the two ring poles. The permanent magnet also drives flux through a second high-reluctance flux path in the stator, by-passing the rotor. An electromagnetic coil in the stator drives a control flux in a circuit including the second path, both ring poles and axial air gaps, and the shunt. The bias and control fluxes are therefore superposed in the axial air gaps for amplified response.

Abstract: In an alternator of this invention, a ratio (t1/t2) between a radial thickness (t1) of a tip and a radial thickness (t2) of a root portion is within a range equal to or greater than 0.10 and equal to or less than 0.25, with a ratio (A/B) between a dimension (A) of overlap between a stator core and disk portions when viewed from a radial direction and an axial dimension (B) of the disk portions being within a range equal to or greater than 0.2 and equal to or less than 1.0, and a ratio (Lp/Lc) between an axial length (Lp) of claw-shaped magnetic poles overlapping the stator core when viewed from a radial direction and an axial length (Lc) of the stator core being within a range equal to or greater than 0.7 and equal to or less than 0.9.