35results about How to "Eliminate magnetic flux leakage" patented technology

A thin film magnetic recording head is provided with a tape bearing surface that has magnetically isolated channels while still providing a maximum continuous surface area with which to engage the media. This can be accomplished by providing spaces in the magnetically permeable thin film that are large enough to prevent cross-talk between the channels, but small enough to prevent significant interference with the moving media. Alternatively, magnetically impermeable thin film spacers can be provided to magnetically isolate each of the channels. The spacers are generally even with the magnetically permeable thin film so as to provide a continuous media-bearing surface.

The invention belongs to the field of motors and electrical appliances, and specifically relates to a salient-pole halbach composite permanent magnet rotation motor. The salient-pole halbach composite permanent magnet rotation motor comprises a rotor and a stator corresponding to the rotor, the rotor is formed by a salient-pole halbach composite array, the salient-pole halbach composite array comprises a single-layer salient-pole halbach composite array and/or a double-layer halbach composite layer, the surface of a salient-pole magnet array is tightly attached to a halbach magnet array to form the single-layer salient-pole halbach composite array, and surfaces at two sides of the salient-pole magnet array are respectively and tightly attached to at least one group of halbach magnet arrays to form the double-layer salient-pole halbach composite layer. According to the salient-pole halbach composite permanent magnet rotation motor, the characteristics of the halbach magnet array are employed, the salient-pole magnet array is arranged in a strong-magnetism area or a weak-magnetism area of the halbach magnet array, the salient-pole halbach permanent magnet motor is formed by the cooperation of the salient-pole magnet array and a stator winding, magnetism leakage of the salient-pole magnet array is greatly reduced or even completely eliminated, the power and output of the motor can be greatly increased with same size and manufacturing cost, or the size and the manufacturing usage cost of the motor can be greatly reduced with the same power, and the salient-pole halbach composite permanent magnet rotation motor is especially applicable to occasions of high-power permanent magnet motor engineering application.

An electromagnetic clutch 1 is disclosed having a magnetic flux loop 31 formed, in magnetic flux loop forming members 5, 7, 9, 11, 13 involving an electromagnet 5 and an armature 13, by the electromagnet 5 to allow the armature 13 to be operatively shifted to couple and uncouple a clutch 11, and a proximate member, close proximate to the members 5, 7, 9, 11, 13, includes magnetic flux leakage minimizing sections 15, 17, 19, 21, 23, 25 that minimize magnetic fluxes leaked from the armature 13 to the proximate member.

The invention relates to a single salient pole permanent magnet motor scheme, which is characterized in that: a stator keeps a salient pole structure which is often used in a general magnetic resistance motor; permanent magnets are orderly and fully embedded in a rotor core along the circumferential direction of an air gap; a novel motor is formed by similarly changing the stator of the general permanent magnet motor into the salient pole type magnetic resistance stator; by adopting the magnetic biasing theory of a major loop and a tooth socket magnetic biasing type magnetic resistance motor and referring to the permanent magnet rotor structure of the general permanent magnet motor, the single salient pole permanent magnet motor scheme has the characteristics of advanced technique and good manufacturability; moreover, because the invention can make a stator trunking and a notch bigger, thereby facilitating to the winding of a winding machine on the one hand and being capable of adopting the multi-span winding of the magnetic biasing motor on the other hand; as a result, the number of turns of each trunking are reduced times, and the consumption of copper wires is greatly reduced.

The invention provides a motor rotor, an assembly method and a motor. The motor rotor is used in a permanent-magnet synchronous motor and comprises a rotor core, wherein a first end ring and a secondend ring are respectively arranged at two ends of the rotor core, a plurality of magnetic isolation guide strips are connected between the first end ring and the second end ring, the plurality of magnetic isolation guide strips penetrate through grooves in the rotor core, a plurality of magnetic steel grooves are formed in the rotor core, and the grooves are arranged in a region between two magnetic steel grooves with opposite-polarity magnetic poles. In the motor rotor, the assembly method thereof and the motor, provided by the invention, the magnetic isolation guide strips are connected withthe end rings, the connection reliability and the structure integration of the motor rotor are improved, and meanwhile, magnetic isolation can be performed on adjacent opposite-polarity magnetic poles of the motor rotor.

The invention provides a Halbach permanent magnet array structure capable of reducing magnetic flux leakage. The Halbach permanent magnet array structure comprises a Halbach permanent magnet array body, a carbon fiber protective sleeve and a Fe-based soft magnetic composite material, wherein the Halbach permanent magnet array body is formed by alternately arranging and combining a plurality of radial magnetizing permanent magnets and a plurality of tangential magnetizing permanent magnets; the outer surface of the Halbach permanent magnet array body is composed of a magnetism gathering surfaceand a plurality of magnetism shielding surfaces; the magnetism gathering surface is coated with a carbon fiber protective sleeve; and the magnetic shielding surfaces are coated with a carbon fiber protective sleeve, and the Fe-based soft magnetic composite material is fixed on the carbon fiber protective sleeve. The carbon fiber protective sleeve and the Fe-based soft magnetic composite materialare adopted for coating, so that magnetic flux leakage is greatly reduced, and even magnetic flux leakage can be completely eliminated. Due to the arrangement of the Fe-based soft magnetic composite material, the magnetic induction intensity at the air gap area can be enhanced. The Halbach permanent magnet array structure can be applied to a radial permanent magnet bearing and a disc type corelessbilateral permanent magnet motor.

The invention provides a punching sheet, a rotor, a motor and an air conditioning system. The punching sheet comprises a body, wherein the body has a plurality of magnetic isolation grooves and a plurality of magnetic steel grooves, two kinds of magnetic steel of different magnetic properties are correspondingly arranged in the plurality of magnetic steel grooves, at least one magnetic isolation groove is arranged between the magnetic steel grooves corresponding to the two kinds of magnetic steel of different magnetic properties, and at least part of each magnetic isolation groove is communicated to the edge of the punching sheet so as to form an open groove. The punching sheet, the rotor, the motor and the air conditioning system solve the problem of high eddy current on the surface of the rotor in the prior art.

This invention discloses a direct drive permanent magnetic reluctance machine including rotor core, external stator excitation winding, inner stator excitation winding, sliaft, inner stator core, rotor keep frame, a bearing, bearing, and outer stator core among which, spline and spline are opened on internal and external cycles of the rotor core laminated by silicon steel sheets, permanent magnet is included, several uniform-distributed splines are opened on the surface of pole, splines on the surface of pole, strip magnet is iserted insplines and permanent magnet has a magnetic field along the tangent of, eliminating leackage in slot and increasing flux density of tooth.

The invention provides a high-permeability three-phase open-type equivalent-magnetic circuit amorphous alloy core and relates to the technical field of transformer cores. The high-permeability three-phase open-type equivalent-magnetic circuit amorphous alloy core comprises three single-box open-type amorphous alloy cores with consistent shape and size, wherein each single-box open-type amorphous alloy core is a rectangular box formed by a left core limb, a right core limb, an upper yoke and a lower yoke; the cross section shape of each core limb of each single-box open-type amorphous alloy core is a semicircle; the core limbs of the three single-box open-type amorphous alloy cores are assembled into the three-phase open-type amorphous alloy core with a three-dimensional triangular structure in a manner that the diameters of the cross sections are laminated with one another; and the cross sections of three core limbs of the three-phase open-type amorphous alloy core are round. An opening is formed in each single-box open-type amorphous alloy core. The core limbs are round in cross sections, are closely spliced, and are small in loss and low in noise.

The invention provides a robot torque motor with an excitation regulating rotor. The rotor comprises a rotor core, an excitation regulating device and an insulating shock absorbing material. Accordingto the invention, the design of the leakage magnetic circuit is more perfect, and the magnetic separation effect is better; magnetic flux leakage can be completely eliminated; a rotor winding is usedto freely change the strength of a magnetic field, and the functions of flux enhancing and flux weakening are realized; problems in high speed and low speed operation of schemes in the prior art aresolved; perfused insulating damping rubber has an elastic damping effect, which can weaken radial electromagnetic force and torque fluctuation transmitted to a load through the rotor core and improvethe noise effect; the rotor winding and the iron core are integrated through glue filling; and the overall structural strength of the rotor can be ensured.

A motor with a full-circumference magnetic flux polarized three phase circumferential windings comprises three phase circumferential windings and six U-shaped stator magnetic poles which perform full-circumference magnetic flux polarization on the circumferential winding and have different orientations. A rotor shaft (200) is connected with rotor magnetic poles (202,203), (206,207), (212,213), (216,217), (222,223), (226,227) with a first orientation to a sixth orientation through rotor discs (201,211,221,231). The number of stator magnetic poles in a random orientation is same with that of the rotor magnetic poles in the orientation. Each phase circumferential winding controls two stator magnetic fields which performs polarization on the full circumference and in two orientations. The three phase circumferential windings (204,214,224) respectively control three phase stator and rotor magnetic fields which are at 120 DEG electric angle to one another. An electronic control system controls current of the three phase circumferential windings through testing the position of a rotor and is used as a motor or a power generator. The motor has advantages of small amount of magnetic flux leakage and high efficiency.

The invention relates to three-phase transformer iron-core, for concreteness that is the stereo three-phase transformer with three identical single phase iron-cores coiled by silicon steel belt, the three iron-core columns are combined together to a equilateral triangle with circular intersecting surface. The transformer made by said iron-core has small magnetic resistance,less iron loss and low noise.