Abstract: A magnet (13) for trapping abraded powder is disposed in a connecting passage between an opening of a sleeve and an opening of a hydrodynamic bearing motor, and a shaft (3), a sleeve (4), a thrust flange (7), and a thrust main plate (5) are made of an austenitic stainless. With this configuration, since the austenitic stainless acting as a nonmagnetic substance is used, it is possible to increase a degree of cleaning. Further, abraded powder of the austenitic stainless is transformed into a magnetic substance, and thus a flow of the abraded powder to the outside can be prevented by providing the magnet for trapping abraded powder in the connecting passage between an opening of a bearing and the outside of the motor.

Abstract: A motor stator in one implementation includes a plurality of teeth disposed in a radial form centered about a predetermined center axis, insulators covering the plurality of teeth, and a plurality of coils provided on each of the plurality of teeth by winding conductors onto the insulators through to multiple layers. At one axial end of the plurality of areas where the insulators cover each of the plurality of teeth, the radius of curvature of the conductor windings on the ending side is larger than the radius of curvature on the starting side. The insulators in a motor stator in another implementation are provided with a first partition and a second partition that, relative to the axial center of the plurality of teeth, respectively cover one side and the other side each tooth.

Abstract: An electric motor including a motor portion, a cooling portion and a plurality of heat pipes is provided. The motor portion includes a stator and a rotor that when energized with electric current causes the rotor to rotate. The motor portion comprises a motor frame that encloses the rotor and stator from exterior elements. The cooling portion is adjacent the motor portion and exterior of the motor portion. In various embodiments it defines a fluid chamber containing a quantity of fluid that is prevented from contacting interior of the motor portion. The plurality of heat pipes within the motor portion extend from the motor portion to the cooling portion such that the fluid contacts the heat pipe within the cooling portion in order to remove heat from the heat pipe.

Abstract: An automotive alternator includes a rotary shaft, a pulley, a stator, a rotor, and a magnetic fluctuation suppressor. The pulley is provided on the rotary shaft to transmit rotating power from an engine to the rotary shaft. The stator includes a stator winding. The rotor is mounted on the rotary shaft and configured to provide a first rotating magnetic field to the stator. The magnetic fluctuation suppressor includes a magnetic body and a magnetic source. The magnetic body is mounted on the rotary shaft such that the magnetic body is rotatable along with the rotary shaft at a rotational speed different from that of the rotary shaft. The magnetic source is fixed to the rotary shaft so as to create a second rotating magnetic field which induces a magnetic attraction between the magnetic body and the magnetic source, by which fluctuations in rotational movement of the rotary shaft are suppressed.

Abstract: A primary part of an electrical induction machine, especially a synchronous motor or a linear motor, includes a plurality of modules which each have teeth situated in a row having at least partially encircling slots, in the slot of each tooth a coil is wound around this tooth, and the coils of a single module are connected to a single phase of a rotary current network. The number of modules in the primary part is equal to the number of current phases or an integral multiple thereof. A single module includes an uneven number of teeth but at least three teeth, and teeth directly adjacent to one another of a single module include coils that have an opposite winding direction, which generates an opposite magnetic field polarity at the teeth. An electrical induction machine, especially a synchronous motor or a linear motor, includes a primary part and a secondary part, working together with the primary part via an air gap, which may have permanent magnets as rotor magnets.

Abstract: A spindle motor according to an embodiment of the invention includes a rotor hub formed of a ferromagnetic material and a rotor magnet held by the rotor hub. The rotor hub has a flange having a shield surface that faces an upper end surface of the rotor magnet via a clearance in the axial direction and formed of a ferromagnetic material. On the outside in the radial direction of an outer peripheral surface of the rotor magnet in the flange, a rim projected downward from the shield surface of the flange is formed.

Abstract: Stable levitation of an object in an alternating magnetic field can be achieved by eliminating coupling between the rotational and translational forces acting on the object. Stable levitation can also be achieved by varying the coupling between the rotational and translational forces acting on the object, while maintaining one or more of the rotational and translational forces steady in time.

Abstract: The symmetry properties of a magnetic levitation arrangement are exploited to produce spin-stabilized magnetic levitation without aligning the rotational axis of the rotor with the direction of the force of gravity. The rotation of the rotor stabilizes perturbations directed parallel to the rotational axis.

Abstract: A device and system for removing heat from a magnetic device such as an electromagnet core section of a magnetic bearing internally by convection. The device includes a ribbon-type conductor portion and an insulator portion that are spirally and coaxially arranged on a coil. The insulating portion includes window portions that provide a fluid passage when the insulating portion is sandwiched between adjacent conductor portions. The device can be disposed in a plenum in the electromagnet core section and at least one opening in the core section, through which a cooling fluid can be introduced into the plenum, can be provided.

Abstract: An ultra-thin motor structure including a stator assembly and a rotator assembly is provided. The stator assembly includes at least one bearing with a bore, a base, and a winding plate. The base has a protruding portion and a deck disposed in the protruding portion. The winding plate is stacked on the deck, and includes a plurality of coils formed by an electroforming process or etching process. Furthermore, the rotator assembly is disposed on the stator assembly, and includes a spindle, a top cover, and a permanent magnet ring. The spindle is fixed in the bore of the bearing, and the permanent magnet ring is disposed on the winding plate and supports the top cover thereon. Thereby, the ultra-thin motor structure can enhance the assembly and mass-production of the motor, and satisfy demands for thinning and performance of the motor.

Abstract: A motor includes a stator having a stator core, a rotor, a case, and a bearing. The motor may further include a bearing hold member provided with a through hole into which the bearing is inserted and which is disposed at one end side to the stator core and a spring member held by the case such that at least one part of the spring member overlaps the bearing hold member at one end side to the bearing hold member to urge the bearing in the through hole to the rotor shaft. A first positioning projection is formed in one of the stator core and the bearing hold member so as to protrude on a side of the other and a first fitting hole is formed in the other of the stator core and the bearing hold member so as to be fitted to the first positioning projection.

Abstract: An electric fan includes a fan base (10), a bearing (40) and a rotor assembly (20). The fan base forms a central tube (11) receiving the bearing therein. The rotor assembly includes a fan hub (22), and a pivot axle (23) joined to the fan hub. The pivot axle pivotably extends into the bearing. A first and second locking rings (50, 70) are received in the central tube. Each of the first and second locking rings defines a central bore (52) therein. The pivot axle is engaged in the central bores of the first and second locking rings. The first locking ring is located at a top of the bearing and the second locking ring is located at a bottom of the bearing to prevent the rotor assembly from escaping from the bearing when the fan is operated.

Abstract: A method for selectively operating an electric motor in one of a first pole configuration and a second pole configuration is provided. The first pole configuration has a first phase winding structure, a second phase winding structure and a third phase winding structure. The method includes energizing each of the first phase winding structure, the second phase winding structure and the third phase winding structure to operate the electric motor in the first pole configuration. The first phase winding structure is reconfigured to form a first phase, a second phase and a third phase of the second pole configuration. The first phase winding structure is energized and each of the second phase winding structure and the third phase winding structure is de-energized to operate the electric motor in the second pole configuration.

Abstract: An electrical machine, in particular a rotary current generator for motor vehicles, is proposed which has a housing (13) in which a stator (16) is retained, such that a coolant can flow around the outside of the stator (16) from one of its axial face ends (57) to a circumferential region of the stator (16), defining a flow cross section of the flow course through the stator (16) and the housing (13). The flow course is defined toward the stator by outer stator teeth (62) located on the outer circumference of the stator (16).

Abstract: An electric machine (10) has a disk-shaped rotor (24) disposed in an operating space between two opposing stator assemblies (11, 12) to provide two axial air gaps (15, 16). The rotor (24) has a hub (28) and an outer ring (26) of non-magnetic material and is further provided with a plurality of permanent magnetic elements (25) for coupling flux that is induced by the magnetic field of the stator assemblies (11, 12). The permanent magnetic elements (25) are spaced apart and reluctance poles (27) are positioned in spaces between the magnetic elements (25) to couple additional flux induced by the magnetic field of the stator assemblies (11, 12). Various constructions and shapes (40-45) for the PM magnetic elements (25) are disclosed, and including PM covers (60) of ferromagnetic material for enhancing q-axis flux in the air gaps (15, 16) and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.

Abstract: An electric machine, in particular a motor, includes a winding support assembly and a measuring system, preferably an infrared measuring system, The measuring system has at least one sensor and an evaluation unit, whereby the measuring system is integrated in the winding support assembly. The infrared sensor, which operates without making contact with the winding support assembly, provides almost instantaneously a measurement value that is proportional to the actual temperature of the winding system, thereby significantly improving motor protection. The sensor can be embedded and sealed in the winding support assembly.

Abstract: A turbomachine having a longitudinal axis, the turbomachine comprising an annular rotor centered on the longitudinal axis of the turbomachine, an annular stator disposed coaxially around the rotor, at least one ball bearing disposed on the rotor and rotatably supporting said stator, the inside of the rotor defining part of an oil enclosure for cooling and lubricating the balls of the bearing, an electricity generator having a secondary magnetic circuit secured to the stator and a primary magnetic circuit constrained to rotate with the rotor, and a detector device for automatically detecting ferromagnetic particles in the oil enclosure, said detector device being powered electrically by electromagnetic induction.

Abstract: Certain exemplary embodiments comprise a system, which can comprise a radial magnetic bearing static portion. The radial magnetic bearing static portion can comprise a plurality of electromagnets. The radial magnetic bearing static portion can comprise a plurality of pulse width modulated amplifiers, each of which can be adapted to provide electrical energy to a corresponding electromagnet of the plurality of electromagnets.

Abstract: An acyclic homopolar electromechanical power converter that uses superconducting series connected rotor elements for series summation of magnetomotive and electromotive force. The novel rotor assembly comprises a plurality of conductor elements connected in series by superconducting series connections. The behavior of the superconducting series connections provides a form of flux isolation and series summation of forces that has heretofore been impossible in electromechanical power converters. The superconducting series connections further modify the rotor impedance of an acyclic homopolar electromechanical power converter to provide long needed improvements to acyclic homopolar electromechanical power converter designs.

Abstract: An electrically powered launcher is disclosed that can accelerate small payloads to orbital velocities. The invention uses a novel geometry to overcome limitations of other design, and allows full exploitation of existing superconducting materials.