7907 results about "Pole piece" patented technology

An embodiment of the invention is a head for perpendicular recording that has a trailing shield and side shields that are connected to the return pole piece by two studs of ferromagnetic material. The studs extend parallel to the track direction and are located a sufficient distance away from the main pole piece to reduce the flux flow from the main pole piece to the studs. Optionally the studs can be recessed behind the air-bearing surface. The preferred embodiment of the invention is a magnetic transducer with separated read and write heads for perpendicular recording.

The invention is a magnetic transducer with separated read and write heads for perpendicular recording. The write head has a trailing shield that extends from the return pole piece toward the main pole piece to form the write gap at the air-bearing surface. One embodiment of the trailing shield is a two part structure with a pedestal and a much smaller tip that confronts the main pole piece at the gap. In one embodiment a sink of non-magnetic, electrically conductive material is disposed in the separation gap between the read head and the flux bearing pole piece. The sink is preferably made of copper and does not extend to the ABS.

A rotary electric machine including a flux-concentrating rotor with permanent magnets disposed between pole pieces, and a stator with teeth having a free end deprived of pole swellings and a concentrated winding. The pole pieces and the magnets are configured so as to minimize the difference Ld−Lq where Ld is inductance on a forward axis and Lq is inductance on a quadrature axis.

An NMR logging tool for conducting NMR measurements in a plurality of sensitive volumes ranging up to a meter from the tool. The tool comprises a magnetic assembly using one or more permanent magnets and at least one pole piece for extending a magnet pole and shaping the magnetic field to simulate a magnetic monopole in a sensitive volume within the formation. Different embodiments of a segmented antenna enable directional NMR logging. The tool embodiments and methods of their use are suitable for wireline or LWD logging, and can be used for directional drilling.

The invention belongs to the technical field of polymer lithium ion batteries, in particular to a diaphragm for the polymer lithium ion battery. The diaphragm comprises a multihole base material, wherein an inorganic substance coating layer and an organic substance coating layer are coated on at least one surface of the multihole base material; and the organic substance coating layer is in island-type and / or linear distribution and coated on the surface of the multihole base material and / or the inorganic substance coating layer. Compared with the prior art, due to the inorganic substance coating layer, the diaphragm can keep relatively high heat stability and mechanical performance, so that the lithium ion battery has high safety performance; the organic substance coating layer has high imbibition swelling capacity, and an interface has high stability, so that the manufactured lithium ion battery has perfect mechanical performance; due to the distribution characteristic of the organic substance coating layer, spaces are provided for charging and discharging processes of a pole piece and a circulation process; and the problem of deformation of the polymer lithium ion battery is well solved. Furthermore, the invention also discloses a polymer lithium ion batter with the diaphragm.