381results about How to "Reduce air gap" patented technology

A blood pump comprises a pump housing; a rotor positioned in the housing and comprising an impeller having a hydrodynamic surface for pumping blood; and a motor including a plurality of magnets carried by the impeller, plus a rotor stator, including an electrically conductive coil located adjacent to or within the housing. The impeller comprises radially outwardly extending, bladelike projections that define generally longitudinally extending spaces between the projections. The shape of the projections and the spaces therebetween tend to drive blood in the spaces in an axial direction as the impeller is rotated. The spaces collectively have a total width along most of their lengths at the radial periphery of the rotor, that is substantially equal to or less than the collective width of the projections along most of their lengths at the radial periphery. Thus, the bladelike projections are thicker, achieving significant advantages.

An embodiment of the present invention provides a stepping actuator, comprising a suspended membrane comprising a plurality of movable electrodes connected by plurality of spring hinges to a payload platform; and anchors connecting said membrane to a substrate, said substrate comprising a plurality of fixed electrodes; wherein said movable electrodes of said suspended membrane and said fixed electrodes from said substrate form parallel-plate electrostatic sub-actuators.

This invention discloses a soft joint of a cross-linked polythene cable including an inner semiconductive layer and metal jacket sleeves, in which, two core leads between two cables are welded to form a core connection part, the inner semiconductive layer is combined with a preserved section of the inner screen layer of the cable characterizing in setting a polythene filled vulcanized insulation layer out of the inner semiconductive layer to be fused with the polythene insulation layer of the cable, and wrapping the polythene insulation of the cable with a transition connection section and an outer semiconductive layer combining with the preserved section of the outer screen of the cable is set out of the polythene filled vulcanized insulation layer, two ends of the metal jacket sleeve are welded with the out surfaces of lead protection pipe of the cable and set with slope connection sections.

An optical-lens-set includes a first lens element of positive refractive power, a second lens element of an image surface with a concave portion near the optical-axis, no air gap between a third lens element and a fourth lens element, at least one of an object surface and an image surface of a fifth lens element being aspherical, both an object surface and an image surface of a sixth lens element being aspherical so that the total thickness ALT of all six lens element, the distance TL from an object surface of the first lens element to the image surface of the sixth lens element and total five air gaps AAG satisfy ALT / AAG≤4.5 or TL / AAG≤5.5.

The configurations of an interleaved flyback converter and a controlling method thereof are provided. The proposed two-phase interleaved flyback converter includes a transformer including a first primary winding having a first terminal, a first secondary winding having a first terminal, a second primary winding having a second terminal, a second secondary winding having a second terminal and a magnetic coupled core device, wherein the first primary, the first secondary, the second primary and the second secondary windings are wound therein, and the first terminal of the first primary winding has a polarity the same as that of any of the first terminal of the first secondary winding, the second terminal of the second primary winding and the second terminal of the second secondary winding so as to eliminate a ripple of a channel current of the converter.

A FinFET device includes a gate dielectric layer on a substrate, a fin on the gate dielectric layer having a middle section and source and drain regions at opposite ends, and a gate structure on the middle section of the fin. The FinFET device also includes a trench in a portion of the source and drain regions and a multi-layered epitaxial structure in the trench. The multi-layered epitaxial structure includes a first epitaxial layer in direct contact with the bottom of the trench, a second epitaxial layer on the first epitaxial layer, and a third epitaxial layer on the second epitaxial layer. The first epitaxial layer is a carbon-doped silicon layer having a carbon dopant concentration of less than 4 percent by weight, the second epitaxial layer is a barrier metal layer, and the third epitaxial layer is a metal layer.

The torque characteristic is improved using a magnetic flux efficiently, and an eddy-current loss generated in a coil is reduced. Moreover, a loss is suppressed even if a metal member having a high thermal conductivity is closely disposed or closely contacted to a coil surface exposed by a variable magnetic field to improve the heat transfer property, thereby improving the cooling capability. A coil assembly for a rotational electric apparatus has first and second coil plates having wiring patterns formed in such a way that conductive coil segments adjoin with each other via slits, magnetic-flux-transfer-member slots formed in the slits and having a wider width than such slits, a coil constituted by the stacked coil plates so that the magnetic-flux-transfer-member slots overlap with each other, and a magnetic flux transfer member inserted into the magnetic-flux-transfer-member slots of the coil.

The torque characteristic is improved using a magnetic flux efficiently, and an eddy-current loss generated in a coil is reduced. Moreover, a loss is suppressed even if a metal member having a high thermal conductivity is closely disposed or closely contacted to a coil surface exposed by a variable magnetic field to improve the heat transfer property, thereby improving the cooling capability. A coil assembly for a rotational electric apparatus has first and second coil plates having wiring patterns formed in such a way that conductive coil segments adjoin with each other via slits, magnetic-flux-transfer-member slots formed in the slits and having a wider width than such slits, a coil constituted by the stacked coil plates so that the magnetic-flux-transfer-member slots overlap with each other, and a magnetic flux transfer member inserted into the magnetic-flux-transfer-member slots of the coil.

An electromagnetic brake (20), in particular for an electric drive is provided, having a brake body (3), which is provided with a sleeve-shaped permanent magnet (4), an electromagnet (5) with an exciting coil (6), an external ring in the form of an external pole and an internal ring (8) in the form of an internal pole, wherein an armature disc (12) rotatably connected to a shaft is attractable against the brake body (3) or the external or internal ring surfaces by the permanent magnet (4) force acting against a return spring force. When the exciting coil is powered, the permanent magnet (4) magnetic field is compensated in such a way that the armature disc (12) is lifted up from the brake body (3) by the spring force, thereby allowing the brake to be released. A radial cross-sectional dimension or cross-sectional thickness d of the permanent magnet (4) is smaller than the axial dimension thereof and a spatial arrangement, viewed in the axial direction, is provided between the armature disc (12) and the exciting coil (6) in the area radially external with respect to the exciting coil (6) or the housing thereof.

The invention provides a split type water jacket with a diversion water tank and an assembly method. The split type water jacket with the diversion water tank comprises an inner arc half water jacket, an outer arc half water jacket, a sealing element, a fastening element and a positioning pin group; wherein the water jacket are two separated bodies by using the centerline of a crystallizer cylinder as a dividing line; an angular water path, a side surface water path and an arc surface water path are arranged in each separated body; an inner cavity of each water jacket is provided with ribs; a diversion water tank is formed between every two adjacent ribs; and crisscross rib plates are distributed at the outer side of the water jackets. When the water sleeves are assembled, the inner arc half water jacket, an outer arc half water jacket are combined according to design dimensions firstly and then are integrally processed; after being processed, the inner arc half water jacket, an outer arc half water jacket are assembled in a crystallizer; combining surfaces are sealed; positioning pins are arranged between the combining surfaces for positioning; and bolts are arranged between the combining surfaces for fastening. According to the split type water jacket, the controllability of cooling water joints is structurally ensured; the deviation between the center of a circle of a copper pipe circular arc and the center of a casting machine can be avoided; the heat exchange effect of the water joints is beneficial for improving; and the production and operation cost is reduced.

A vehicle wheel rolling bearing has a sealing device integrated with a magnetic encoder. A semi-float type bearing apparatus has said rolling bearing which can protect a magnetic encoder and improve the sensing ability of the detecting sensor. The rolling bearing has an inner member with a wheel hub having a wheel mounting flange and an inner ring formed with inner raceway surfaces. An outer member is formed with double row outer raceway surfaces opposite the inner raceway surfaces. Double row rolling elements are between the raceway surfaces. Sealing devices include an inboard sealing device with an annular seal fitted on the outer member. A pulsar ring is mounted on the inner member and has an encoder mounted on a cylindrical holding portion. The encoder is arranged opposite to the annular seal. The encoder includes magnetic poles formed by magnetic powder with alternating polarity along its circumferential direction. A detecting sensor passes through the cylindrical portion of the seal and opposes the encoder. A predetermined air gap is kept between the encoder and detecting sensor.

The invention relates to a magnetic trigger mechanism at least comprising a yoke having an armature opening, in which yoke an armature is placed, which armature is coaxially surrounded by at least one section of the coil body having at least one excitation coil and which is acted on by the force of a preloaded spring element and which remains in a first end position due to the magnetic retaining force of a permanent magnet when current is not flowing through the excitation coil, the permanent magnet being arranged in the area of the first end of the armature together with a base extending between the armature and the permanent magnet, and the second end position of the armature being achieved by means of a brief flow of current through the excitation coil together with the accompanying lowering of the magnetic retaining force and the spring force, which is effective then. The invention is characterized in that the first end of the armature, which first end faces away from the armature opening, is guided in the coil body in a centered manner, and the second of the armature, which second end faces the armature opening, is likewise guided in a centered manner by means of a centering ring centered in the coil body, the highly permeable centering ring lies against the yoke at the armature opening and can move radially relative to the yoke, the base is centered in the coil body, the centering ring together with the coil body ensuring that the armature lies flat in the area of the first end without tipping and always guaranteeing maximum retaining forces due to the armature lying flat, the spring element having a larger diameter than the armature, and the magnetic flux commutating upon triggering from a series connection to a parallel connection.

The invention relates to a valve (1), comprising a body (2), within which a needle (3) moves, which can rest with sealing against a seat (23), fixed to the body (2). The needle (3) is magnetically coupled to an actuator body (5), across a closed and a magnetic chamber (4) provided with several magnets (52) between which magnetic bodies (53) are interspersed. The needle (3) has no magnets and is provided with ribs (36) made from a magnetic material. According to the invention, an improved magnetic coupling may be achieved, whereby the thickness and the relative separation of the ribs (36) are largely equal to the thickness (e53) and the relative separation (l52) of the magnetic bodies (53).

In the present invention, each tooth (22) has a tooth body part (24) and a tooth tip part (25). A pair of slant parts (26) project from both circumferential sides of the tooth tip part (25). A tip surface (27) is formed on the inner diameter-side end surface of the tooth tip part (25) so as to face a magnet (15) across an air gap (g). A recessed groove part (28) extending in an axial direction is disposed at the center of the tip surface (27). The depth (d) of the groove part (28) is set in the range of 0 < d <= (Lx-Rt) / 3, and the width (Wg) is set in the range of Wt > Wg >= Wt / 2 (Lx: distance from the center of a rotor to a tooth-slant intersection (X), which is the intersection of an extended line (P) from a circumferential side surface of the tooth body and an extended line (Q) from the slant surface of the slant part; Rt: radius of the inner diameter of the tooth tip surface; Wt: width of the tooth body).

Deformation and vibration of claw magnetic poles in rotor are reduced. A rotor includes: a rotor coil 15 for generating a magnetic flux by applying a current; a pole core comprised of a first pole core body 19 and a second pole core body 20 that are disposed so as to cover the rotor coil 15, each being provided with claw-shaped claw magnetic poles 21, 22 engaging with each other; and a magnet assembly 25 composed of a magnet 23 for reducing leakage of magnetic flux and a magnet-holding member 24 for supporting the magnet 23 on the claw magnetic poles 21, 22. Center of gravity 25G of the magnet assembly 25 is located on the base part side nearer than the center of the claw magnetic poles 21, 22.