189results about How to "Avoid Flux Leakage" patented technology

A write element for use in perpendicular magnetic recording. The write element including a write pole and a self aligned wrap around shield that can have a trailing shield gap thickness that is different from its side shield gap thickness. The materials making up the trailing shield gap and the side shield gaps can be different materials or can be the same material deposited in two different steps. The side or wrap around portions of the trailing shield can extend down to the level of the leading edge of the write pole or can terminate at some point between the levels of the leading and trailing edge to form a partial wrap around trailing shield.

A magnetic head includes a main pole, a write shield, and a gap part. The write shield includes first and second side shields and a top shield. The main pole has first and second side parts. The first side shield has a first sidewall. The second side shield has a second sidewall. The gap part includes a gap film and a nonmagnetic layer. The gap film is disposed to be in contact with the first and second sidewalls. The first side part has first and third side surfaces arranged in this order from the medium facing surface side. The second side part has second and fourth side surfaces arranged in this order from the medium facing surface side. The nonmagnetic layer is present between the third side surface and the first sidewall and between the fourth side surface and the second sidewall.

A magnetic circuit having a dual magnet, a speaker and a vibration generating apparatus using the same are provided. The magnetic circuit includes a magnetic gap having a small magnetic loss and an increasing magnetic flux density, in which a uniform distribution of a line of magnetic force can be realized on yoke surfaces facing each other. The speaker includes lower and upper magnets which are spaced so that mutually identical polarities oppose each other; a first yoke integrally having a loop-type circulating circuit portion extended from the lower magnet to the upper magnet and an extension portion which is extended perpendicularly upwards from the lower magnet; a second yoke which connects between the lower and upper magnets and forms a magnetic gap between the second yoke and the extension portion of the first yoke; a coil disposed in the magnetic gap and wound around a bobbin; a frame which is extended from the first yoke; a vibrating diaphragm generating an acoustic sound in correspondence to a drive signal; a damper limiting a vibration range of the bobbin; and a center cap covering the bobbin.

A magnetic head for use in a perpendicular recording system having a novel shield structure that provides exceptional magnetic shielding from extraneous magnetic fields such as from a write coil, shaping layer or return pole of the write head. The magnetic head includes a write pole, a return pole and a magnetic shield that is magnetically connected with the return pole near the ABS and extends toward the write pole. The shield is formed with a notch at its edge closest to the write pole. The notch assures adequate physical, magnetic, and electrical separation between the write pole and the shield, while allowing un-notched portions of the shield to provide additional magnetic shielding.

A motor comprising: a rotor including a permanent magnet type rotor unit having a plurality of permanent magnets and a reluctance type rotor unit having a plurality of magnetic salient pole portions and a plurality of slits for preventing flux leakage, the rotor units being coupled to each other in an axial direction; and a stator for generating a field for driving the rotor. Elongated holes for preventing the short-circuit of magnetic fluxes are arranged near edges of the permanent magnet of the permanent magnet type rotor unit. The elongated holes or notches are arranged within a range defined so that 0.95α≦θ≦1.05α with α={(360/S)−R}/2 (degrees), where θ is an angle formed between a magnetic pole boundary and a center of the elongated hole or the notch in a forward direction of rotation of the rotor with respect to a center of a rotating shaft, R is an angle formed by a tooth width of the stator with respect to the center of the rotating shaft, P is the number of rotor poles, and the number of stator slots is S=3P/2.

The invention relates to a two-stage series pressurization direct-driven centrifugal air compressor of a fuel cell engine. The two-stage series pressurization direct-driven centrifugal air compressor comprises end covers, a spindle, volutes, impellers, a rotor, a stator and a driver. The spindle is supported by a left-end radial supporting air foil bearing, a left-end radial supporting air foil bearing bush, an air foil axial thrust bearing and a right-end radial supporting air foil bearing, wherein the left-end radial supporting air foil bearing and the left-end radial supporting air foil bearing bush are arranged on the left side, and the air foil axial thrust bearing and the right-end radial supporting air foil bearing are arranged on the right side of the spindle. The left-end radial supporting air foil bearing bush is arranged on the outer side of the spindle in a surrounding manner. The left-end radial supporting air foil bearing is fixed to the outer side of the left-end radial supporting air foil bearing bush. The air foil axial thrust bearing is fixed to the outer side of the spindle in a bush form. The right-end radial supporting air foil bearing is fixed to the outer side of the air foil axial thrust bearing. Compared with the prior art, the two-stage series pressurization direct-driven centrifugal air compressor is more suitable for the air inlet pressurization scene of the fuel cell engine with the high oilless air inlet requirement, and the durability and reliability of the air compressor of the fuel cell engine can be improved.

A reciprocating motor and a reciprocating compressor having the same make the manufacture of a stator easier and therefore reduce manufacturing costs by configuring the stator such that an inner stator positioned inside the mover and an outer stator positioned outside the mover are integrally formed, or by making the inner and outer circumferential surfaces of the stator have the same curvature. Also, no gap is generated between the inner stator and the outer stator, and this prevents magnetic leakage, thereby improving the performance of the motor. Also, the use of magnets can be reduced by omitting magnets between stator blocks, and therefore manufacturing costs can be reduced, when compared to the efficiency of the motor.

Disclosed is a variable differential mount apparatus using a Magnetorheological Elastomer (MRE). The apparatus includes a core, a coil, a plurality of MRE supports, and a magnetic path formation member. The core has a plurality of arms disposed thereon. The coil is wound on the plurality of arms, respectively. The plurality of MRE supports are disposed to face the plurality of arms, respectively. The magnetic path formation member is disposed outside the plurality of MRE supports. More specifically, a current is applied to coil to vary the degree of stiffness of the variable differential mount based on a particular driving condition to allow for increased handling and comfort.

A main pole has a top surface including a first portion and a second portion. The main pole has a bottom end including a third portion and a fourth portion. Each of the first and third portions has a first end located in a medium facing surface. The first portion is inclined relative to the medium facing surface and a first virtual plane that passes through the first end and is perpendicular to the medium facing surface and to the direction of travel of a recording medium. The third portion is inclined relative to the medium facing surface and a second virtual plane that passes through the first end and is perpendicular to the medium facing surface and to the direction of travel of the recording medium. The first portion is smaller than the third portion in length in a direction perpendicular to the medium facing surface.

A magnetic head includes a coil, a main pole, a write shield, a gap part, and a return path section. The return path section is located on the front side in the direction of travel of a recording medium relative to the main pole, and connects the write shield and part of the main pole away from a medium facing surface to each other. The coil includes a specific coil element. The main pole has a top surface including an inclined portion and a flat portion. The write shield has an inclined surface. The inclined surface includes a first portion opposed to the inclined portion with the gap part therebetween, and a second portion located farther from the medium facing surface than the first portion. The specific coil element includes a portion interposed between the flat portion and the second portion.

A coil surrounding only the tip of nozzles of a plastic extruding die is provided. By passing a high frequency current through the coil to selectively heat only the tip of the nozzles. Further, in a plastic extruding die in which a high frequency current is passed through a coil provided around nozzles to heat the periphery of the nozzles, the coil is formed of a conductor tube through which a coolant is caused to flow.

A flux concentration-type motor includes a ring-shaped stator, in which coils are wound on a plurality of teeth radially arranged; and a rotor, located at the center of the stator, having a plurality of magnets arranged in a circumferential direction such that poles, having the same polarity, of the magnets face each other, and rotated by the interaction with the stator, so as to prevent the leakage of magnetic flux of the magnets, thereby improving the torque compared to a conventional surface mounted permanent magnet-type motor having the same volume, reducing the production costs, and facilitating the miniaturization of products.

In a vehicle AC generator, the rotor has two pole pieces that axially enclose a field winding, while a tubular stacked-lamination core formed of axially stacked magnetic laminations is mounted with its inner circumference in contact with outer circumferences of the pole pieces. A plurality of axially extending elongated permanent magnets each magnetized in the circumferential direction are implanted in the stacked-lamination core, with adjacent permanent magnets polarized in opposite directions, so that axially extending circumferentially alternating N and S rotor poles are formed at the outer circumferential surface of the stacked-lamination core by the magnetic flux of the field winding.