Abstract: A modular rotational electric actuator includes an output housing and internal drive components that include integrated control electronics, a torque sensor, and a portion of a joint assembly. The joint assembly includes a joint connector coupled to the internal drive components, including integrated control electronics, e.g., by a resilient member. The resilient member elastically couples the joint connector to a portion of the output housing, the joint connector including a portion that extends outward therefrom.

Abstract: A generator for a wind turbine is proposed. The generator has a stator, a rotor having a rotor housing surrounding the stator, and a main bearing to support the rotor housing such that the rotor housing is rotatable about an axis of rotation. The stator has a plurality of cylindrical elements extending in parallel with the axis of rotation, and the rotor has a front element having a plurality of holes at positions alignable with the cylindrical elements, such that the rotor is fixable to the stator by inserting a fastening member through a cylindrical element and a hole aligned with the cylindrical element.

Abstract: An electric machine (100) comprises a stator (112) and a rotor (114a, b) mounted for rotation about a rotor axis (120) with respect to the stator. Permanent magnets (124a, b) are carried by the rotor. The rotor has an output (190). The stator has coils (122) wound on stator bars (116) for interaction with the magnets. The rotor has two stages (114a,b) arranged one at either end of the stator bars, with two air gaps (126a,b) between the ends of the bars and the rotor stages. An annular housing (102, 142a, b, 146) retains and mounts the stator. A bearing (164a, b) is between the rotor and stator, the rotor being hollow around said rotor axis. There are two significant magnetic flux paths (30,30?) of the motor. The first passes between adjacent coils in a circuit on a substantially circumferential plane with respect to the axis (120). A second path 30? is in an axial plane, passing around the bearing.

Abstract: An electromagnetic control device has a coil with a central axis and an interior space, and a control element that moves along the axis and is arranged at least partially within an interior space of the coil. The control element comprises an armature that axially moves to a desired position when the coil is energized. The coil is divided into at least two separate portions that are arranged axially behind one another and connected electrically in series with one another. An electric central tap is provided, between two adjacent coil portions, by which a sensor current, provided for determining an axial position of the armature, can be fed into a subset of the coil portions. When the armature is in a defined axial position, an axial end face of the armature is located within an axial area determined by an axial separation zone provided between two adjacent coil portions.

Abstract: An apparatus having at least one rotatable driven object having an edge on which are disposed a series of adjacent magnets of alternating polarity and a driving object rotatable by an external motor torque and having a series of adjacent magnets of alternating polarity on a magnet supporting surface. The magnet supporting surface of the driving object is rotatable through a common region approximately centered about the point of closest approach to the magnet supporting edge of the driven object for sequentially placing magnets of the driving object in the region enveloping the effective interactive range between the two objects. The fields of magnets of opposite polarity of the driving object interact with the fields of the magnets on the driving object to effect rotation of the driven object. Disclosed are structures for torque limiting wheels, magnetic gear trains, reduction gears and ball joints, and propulsion systems for watercraft and aircraft.

Abstract: In an induction motor, when dimensions of respective elements of a rotor slot are defined as TB: a shortest distance between a center side of an inner circumferential slot and an outer circumference of the rotor; TC: a circumferential width of an innermost circumference of an outer circumferential slot; TD: a circumferential width of an outermost circumference of the inner circumference slot; and TE: a shortest distance between an end side of the inner circumferential slot and the outer circumference of the rotor, and when dimensions of respective elements of a stator iron core are defined as TF: a width of teeth; TG: a width of a teeth tip end; and TH: a width of a slot opening part, the dimensions of the respective elements of the rotor slot and the dimensions of the respective elements of the stator iron core satisfy the following relationships: TF/(TG+TH)×TD/2?TB?TD/2; and TF/(TG+TH)×TD/2?TE?TD/2.

Abstract: A power generation apparatus includes a dielectric, a movable member being opposed to the dielectric with a predetermined distance, and an electret and an opposing electrode that are formed on the surface of the movable member facing the dielectric so as to generate a fringe electric field penetrating the dielectric between the two electrodes. When the volume occupancy of the dielectric between the electret and the opposing electrode varies in accordance with a displacement of the movable member, the power generation apparatus outputs the electric charge induced in the opposing electrode as electric current.

Abstract: A permanent magnet rotor includes a shaft, a rotor core fixed to the shaft, a bracket fixed to the rotor core, and a plurality of permanent magnets contacting an outer surface of the rotor core. The bracket includes a base at one axial end thereof, a plurality of arms axially extending from the base and spaced in a circumferential direction, and an end ring connecting the arms at the other axial end thereof. The base has an opening for the insertion of the shaft. The rotor core is positioned between the arms. Each magnet is sandwiched between two adjacent arms. An inner diameter of the end ring is greater than an outer diameter of the rotor core.

Abstract: A motor is provided for use in a machine. The motor includes a segmented stator and a resiliently flexible clip. The stator includes a core having spaced apart arms and a yoke. The arms define an opening therebetween, and the yoke spans the opening. The clip is removably retained on the core so as to apply pressure against each arm toward the yoke such that the arms are retained in contact with the yoke.

Abstract: Discloses is a motor for an environmentally friendly vehicle. In particular, the motor includes a stator core including a first coating portion and a second coating portion. The first portion and the second coating portion are adjacent to each other, wound with a coil on an outside thereof and fixedly installed in a motor case and the first coating portion is thinner than the second coating portion. The motor also includes a rotor core configured to move between the first coating portion and the second coating portion depending upon a speed of the motor. A controller is configured to control an operation of an actuator to move the rotor between the first coating portion and the second coating portion to maximize the efficiency of the motor depending upon the speed of the motor.

Abstract: A core is formed by laminating a plurality of core plates. Each of the core plates includes a joint portion for joining the core plates together in the laminated state. Each of the joint portions includes a fixing piece, a passage hole, a receiving portion, and an opening. Each of the fixing pieces is raised in the direction in which the core plates are laminated. Each of the passage holes receives the fixing piece of the corresponding adjacent one of the core plates. The fixing piece in the passage hole is bent to join the receiving portion to the adjacent core plate. Each of the openings receives the corresponding one of the fixing pieces to avoid interference with the fixing piece bent onto the receiving portion of another core plate.

Abstract: A brushless motor may comprise a rotor comprising a shaft, a back yoke fixed on the shaft, a permanent magnet disposed at an outer circumference of the back yoke and first and second resin portions. The first resin portion may be formed at one ends of the back yoke and the permanent magnet and the second resin portion may be formed at other ends. The first and second resin portions may be fixed the back yoke and the permanent magnet. A communication hole communicating one end side and another end side in the shaft axis direction may be formed through the back yoke or between the shaft and the back yoke. A third resin portion connecting with the first and the second resin portions may be formed within the communication hole. The first, second and third resin portions may be formed integrally.

Abstract: The invention relates to an electric machine, comprising a rotor (8; 50; 76) and a stator (9; 29; 77), wherein the rotor (8; 50; 76) and/or the stator (9; 29; 77) comprise at least one laminated core (2; 11; 32; 72) having a substantially rectangular cross-section, wherein the laminated core (2; 11; 32; 72) comprises a sheet metal strip (1), wherein the sheet metal strip (1) is wound in a coil shape.

Abstract: A dual earth starter motor for a vehicle. The starter motor includes a housing, an armature within the housing, a brush plate within the housing arranged to deliver electric current, by means of conductive brushes, to the armature, and two separate earth terminals electrically connected to the brush plate with each terminal extending through a wall of the housing. In a preferred form, the two earth terminals are electrically isolated from the housing, and at least one of the terminals is mechanically and electrically coupled to the brush plate my means of an interference fit between a portion of the terminal and a hole formed in the brush plate. A method of retrofitting a second earth terminal to an existing starter motor is also disclosed.

Abstract: An electric motor, in particular a motor which can be commutated electronically, is disclosed. The motor comprises a stator with a plurality of field windings which are wound at least in places from a winding wire, and further comprises a contact grid for making contact with the field windings, which contact grid has a plurality of conductor tracks which are insulated from one another, with the conductor tracks having contacts to which the winding wire is fixed, wherein the winding wire is cut through between specific contacts such that this results in the field windings being connected in a manner which is suitable for generating a rotating field when being powered by a suitable motor controller.

Abstract: The invention relates to a fluid dynamic bearing system having a bearing bush and a shaft that are rotatable with respect to one another about a common rotational axis and form a bearing gap filled with bearing fluid between associated bearing surfaces. The bearing surfaces form at least one fluid dynamic radial bearing. A rotor component is disposed on the shaft. A stopper ring is disposed on the shaft or on the rotor component and adjoins the bearing bush, wherein a gap is formed between the mutually facing surfaces of the bearing bush and the stopper component that is filled with a bearing fluid and connected to the bearing gap and extends substantially in a radial direction. According to the invention, the surfaces of the bearing bush and/or the stopper component are formed such that the gap is tapered, narrowing radially outwards.

Abstract: In an electric motor, each tooth of the stator has a radially extending pillar portion and the number of teeth per magnetic pole is k. When the number k is odd and a center line passing each pole agrees with a center of a circumferential width of one tooth, the pole has first and second corners which are the closest to the stator and positioned before and after the center line in a rotational direction, respectively, and the teeth includes teeth which are the closest to the first and second corners and defined as first and second teeth, respectively. The first and second corners are located according to positional relationships of the first and second teeth and edges of the pillar portions of the first and second teeth in the rotation direction.

Abstract: A hybrid type permanent magnet bearing system which utilizes four permanent magnet rings to replace the mechanical bearings. These rings are divided into two separated groups along an axis, where each group has an inner ring and a separated outer ring. At least one permanent magnet ring has a surface facing the gap between the two groups but being not vertical to the axis. Hence, inside the gap, the magnetic field between these permanent magnet rings is not non-uniform over different directions, and then it may behave as the axial and radical bearing simultaneously.

Abstract: A generator includes a thin first contact charging layer and a thin second contact charging layer. The thin first contact charging layer includes a first material that has a first rating on a triboelectric series. The thin first contact charging layer has a first side with a first conductive electrode applied thereto and an opposite second side. The thin second contact charging layer includes a second material that has a second rating on a triboelectric series that is more negative than the first rating. The thin first contact charging layer has a first side with a first conductive electrode applied thereto and an opposite second side. The thin second contact charging layer is disposed adjacent to the first contact charging layer so that the second side of the second contact charging layer is in contact with the second side of the first contact charging layer.

Abstract: According to one embodiment, a rotating electrical machine has a vibrating-element. The vibrating-element has spring bars and circular members which cover spring bars while a part is connected to spring bars. The spring bars are connected to first stator core connection portions, which are formed so as to be spaced out in a circumferential direction from each other at two locations on a side surface of the stator core. The stator frame is connected by the second stator core connection portions, which are formed by two locations which are different from the first stator core connection portions, of the stator core. The second stator core connection portions contain a position adjacent to a node portion of a circular mode of vibration of the stator core, in which antinodes and nodes of vibration alternately appear in the circumferential direction as the vibrating-element is attached to the stator core.