34 results about "Magnetostatics" patented technology

Current-perpendicular-to-the-plane (CPP), current-in-to-the-plane (CIP), and tunnel valve type sensors are provided having an antiparallel (AP) coupled free layer structure, an in-stack biasing structure which stabilizes the AP coupled free layer structure and a nonmagnetic spacer layer formed between the in-stack biasing layer and the AP coupled free layer structure. The AP coupled free layer structure has a first AP coupled free layer adjacent to the nonmagnetic spacer layer, a second AP coupled free layer, and an antiparallel coupling (APC) layer formed between the first and the second AP coupled free layers. The net moment of the AP coupled free layer structure has an antiparallel edge magnetostatic coupling with the in-stack biasing structure. At the same time, the first AP coupled free layer has an antiparallel exchange coupling with the second AP coupled free layer. By forming the second AP coupled free layer with a thickness greater than a thickness of the first AP coupled free layer, the AP coupled free layer structure has a net magnetic moment in the direction of the second AP coupled free layer moment. The non-magnetic spacer layer is chosen so that first AP coupled free layer has a parallel interlayer (Neel or Orange-peel or positive exchange) coupling with the in-stack biasing structure, so that the interlayer coupling adds to the edge magnetostatic coupling to increase a stability of the AP coupled free layer structure.

The invention relates to a method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force and belongs to the technical field of nondestructive testing. The method comprises the following steps: arranging a permanent magnet on the surface of a calibration sheet, and measuring reacting force of magnetostatic force which acts on the permanent magnet by using a force sensor; arranging the permanent magnet on the surface of a sheet to be measured, and measuring reacting force stressed by the permanent magnet by using the force sensor; and comparing the two reacting forces, if the same, determining that a surface defect or an internal defect does not exist on the sheet to be measured, and if different, determining that a surface defect or an internal defect exists on the sheet to be measured. The method is simple in measurement process, relatively low in detection cost and reliable in detection result; the measurement accuracy is high, and micron order micro-defects in the magnetic sheets can be detected; the detection speed is high, and sheet materials can be rapidly detected on line in real time.

A static magnetic field double-roll casting and rolling machine comprises a frame, an in-frame upper bearing seat, an upper casting and rolling roll, an in-frame lower bearing seat, and a lower casting and rolling roll; the upper casting and rolling roll, a first transmission shaft, a first reducer and a first DC motor are connected in sequence; the lower casting and rolling roll, a second transmission shaft, a second reducer and a second DC motor are connected in sequence. The frame is also provided with a water cooling system and a hydraulic cylinder which is used for adjusting the elevation and subsidencei of the lower casting and rolling roll; two magnetic poles are respectively contacted with the upper casting and rolling roll and the lower casting and rolling roll. The upper casting and rolling roll is contacted with a first magnetic pole; the lower casting and rolling roll is contacted with a second magnetic pole; the first magnetic pole and the second magnetic pole are connected with an iron core; the iron core is provided with a magnet exciting coil; the magnet exciting coil is connected with a DC power; the DC power applies large current on a loop manufactured by a copper tube and applies the static magnetic field generated by the loop between the clearances of the rolls by the casting and rolling rolls by the magnetic poles made from ultra-low-carbon steel. The static magnetic field double-roll casting and rolling machine of the invention can manufacture fine and purified metal plate belt materials with uniformly distributed alloy elements, no crack and high property.

The invention discloses an injection molding preparation method for a magnetic composite material in a magnetostatic field. The method includes the steps that (1) a mixture of ferromagnetic particles and thermoplastic plastics or a mixture of the ferromagnetic particles, thermosetting plastics and a curing agent is heated to be evenly mixed; (2) the raw materials are injected into a mold under certain pressure, the injection temperature is 140-260 DEG C, the magnetostatic field is applied in the position of the mold, and the magnetic field strength is 0.01-2.0 T; and (3) after pressure maintaining is conducted for a period of time, the mold can be opened when plastic parts are cooled to a certain temperature, the plastic parts are pushed out of the mold under the action of an ejecting mechanism, and accordingly the product is obtained. The method has the advantages that the magnetic composite material is prepared through the mature injection molding method, and the controllable composite material with ingredients being changed continuously can be prepared conveniently within a large thickness range by adjusting the magnetic field strength, the magnetic field gradient and other preparation technological parameters.

The invention belongs to the technical field of magnetizing, and aims to provide a magnetostatic field magnetizing device and method at a normal temperature. The device is compact in structure, stable in performance, safe and reliable, capable of saving energy and high in magnetizing efficiency. The device comprises an upper magnetizing source device and a lower magnetizing source device. The upper magnetizing source device comprises an upper supporting plate, yoke iron bodies and magnetizing magnetic steel bodies. Each yoke iron body is in the shape of a cuboid, and the four side faces of each yoke iron body are each provided with one magnetizing magnetic steel body in a pasting mode. The lower ends of the yoke iron bodies protrude out of the magnetizing magnetic steel bodies, and magnetizing heads are pasted in the central positions of the yoke iron bodies. The bottoms of the magnetizing magnetic steel bodies are fixedly attached to the upper supporting plate. A through groove is formed in the central position of the upper supporting plate, and the magnetizing heads of the yoke iron bodies are located in the through groove of the upper supporting plate. The structure of the lower magnetizing source device is the same as the structure of the upper magnetizing source device, and the lower magnetizing source device and the upper magnetizing source device are symmetrically arranged. A material guide plate is arranged between a lower supporting plate of the lower magnetizing source device and the upper supporting plate of the upper magnetizing source device, material guide through grooves are formed in the material guide plate, and the positions of the material guide through grooves correspond to those of the magnetizing heads. The lower supporting plate is fixedly connected with the upper supporting plate.

The present invention relates to a method for augment static magnetic field intensity of moving-coil geo-phone and a moving-coil geo-phone. Winding coil by plane winding type on the alnico surface between upper and lower magnetic boots on moving-coil geo-phone to form multiple helix coils; supplying constant DC current to helix coils and then the magnetic field direction caused by helix coils is identical to the magnetic field direction of alnico. A moving-coil geo-phone comprises of coil rack, coil winding of upper and lower signal, alnico, upper and lower magnetic boots, and helix coil winding by plane winding type, the helix coil and signal coil on coil rack on coil rack are connected parallely, which are connected on signal transmitting line in series. The present invention has simple and reasonable structure, improves the sensitivity and capability of cymoscope efficiently.

The invention discloses a high-precision magnetostatic suspension accelerometer adopting a multiple quadrupole coil independent regression control technology, used for measuring a linear accelerationof an aircraft. The high-precision magnetostatic suspension accelerometer comprises a vacuum magnetic shielding cavity system, a magnetic field displacement sensing system, a multiple quadrupole coilmagnetic suspension control system and an inspection magnet. The accelerometer disclosed by the invention realizes real-time accurate measurement on position and attitude of the inspection magnet by adopting a magnetic field displacement sensing technology and realizes accurate regression control on position and attitude of the inspection magnet by adopting a multiple quadrupole coil independent regression control magnetic suspension technology, so that the inspection magnet is controlled to be always at the center of the cavity and a location of the mass center of a spacecraft; and when the spacecraft is effected by an external nonconservative force, magnitude and direction of the acceleration can be finally accurately measured by measuring a position control coil current as the acceleration of the aircraft is in direct proportional to the position control coil current. The accelerometer disclosed by the invention can avoid a technical bottleneck of high-precision machining, is simplein production process and can realize acceleration vector measurement with higher precision.

The invention provides a transmission line iteration-based solving method for a 2D axial symmetric nonlinear magnetostatic field model. The method comprises the steps of performing coarse network division and fine network division on a solving domain; adding a corresponding transmission line between a nonlinear element and a linear network; and performing solving on a circuit through an incidence stage and a reflection stage of multi-time iteration to obtain a magnetic potential cloud chart in a 2D axial symmetric nonlinear magnetostatic field. Compared with an existing Newton iteration method, the method has a very great advantage in solving time and has a wide application prospect.

The invention relates to an oscillation welding method under the action of a magnetic lens and a magnetic lens device. The method controls welding arc by an additional magnetic field and exerts an alternating magnetic field in the direct current welding process and a direct current (DC) magnetostatic field in the alternate current (AC) process so as to produce electromagnetic oscillation; meanwhile, the welding arc is effectively controlled by the magnetic lens device. The magnetic lens device has a double pole-shoe magnetic lens device arranged above a welding seam and a single pole-shoe magnetic lens device arranged under the welding seam. The magnetic lens device exerts the electromagnetic oscillation and the grain structure of the welding seam is converted from the original bulky columnar crystal to the fine equiaxial crystal, the magnetic field strength around the pole shoe of the magnetic lens device can be doubled when the magnetic lens device is used, which can control the electric arc more effectively. The magnetic lens device provided by the invention has the advantages of reasonable design, simple and compact structure, easy realization and convenient operation.

The invention discloses a method for raising an orientation degree of Nd-Fe-B powder particles. The method comprises the steps of: loading a plurality of Nd-Fe-B powder particles in a mold cavity, applying an external magnetic field on the Nd-Fe-B powder particles in the mold cavity to allow the Nd-Fe-B powder particles to rotate by the action of a magnetostatic torque force and be subjected to a magnetostatic torque which is the same as a torque generated by mechanical resistance and friction among the Nd-Fe-B powder particles, applying vibration waves on the Nd-Fe-B powder particles on the basis of keeping the external magnetic field, allowing the Nd-Fe-B powder particles to be subjected to the action of the magnetostatic torque force of the external magnetic field only when the adjacent Nd-Fe-B powder particles are separated, and therefore, allowing the Nd-Fe-B powder particles to turn to the external magnetic field. According to the method, since the vibration waves are applied on the Nd-Fe-B powder particles, c axes of the Nd-Fe-B powder particle are turned to the external magnetic field more easily, and the orientation degree of magnetic steel is raised.

The invention belongs to the technical field of health care physical therapy, and provides a magnetostatic cushion. The magnetostatic cushion comprises a lumbar pelvic health care assembly, a pelvic femoral health care assembly detachably connected to the lumbar pelvic health care assembly and a reproductive system health care assembly. The reproductive system health care assembly comprises a horizontal part detachably connected to the lumbar pelvic health care assembly and a vertical part, wherein one end of the vertical part is detachably connected to the horizontal part, and the end, away from the horizontal part, of the vertical part is detachably connected to the pelvic femoral health care assembly; and the lumbar pelvic health care assembly, the pelvic femoral health care assembly and the reproductive system health care assembly comprise substrates and a plurality of permanent magnets embedded in the substrates. Compared with an existing cushion, when a user uses the magnetostatic cushion, the lumbar pelvic health care assembly, the pelvic femoral health care assembly and the reproductive system health care assembly can be wrapped on the part, corresponding to a reproductive system, of a human body, so that the permanent magnets perform magnetic therapy on the reproductive system from multiple angles, and health care effect is better.

The invention discloses a magnetostatic energy power machine, and relates to the field of magnetostatic energy power. The magnetostatic energy power machine comprises a guidance shaft, a power outputrotor, an outer stator, an inner stator, a guidance rotor, a control device, a guidance shaft and holes, wherein the guidance shaft, the control device, the inner stator and the guidance rotor are sequentially arranged to form a concentric structure from inside to outside, the holes are formed in the guidance shaft, two ends of the guidance shaft are fixed on an outer stator end cover, the inner stator is fixedly connected with the guidance shaft, two ends of the guidance rotor are movably connected with the guidance shaft, and the guidance rotor is engaged with the power output rotor in a magnetic suspension way. The magnetostatic energy power machine is simple in structure and remarkable in effect; the magnetostatic energy among the inner stator, the outer stator and the guidance rotor is used for doing work, so that the power output rotor is driven to rotate and output power during rotation of the guidance rotor; and the magnetostatic energy power machine has the advantages of simplicity, practicability, low energy consumption, no pollution, low cost of materials and no waste and is suitable for production activity such as power generation and mechanical transmission.

The invention relates to a magnetostatic method for online monitoring vibration marks of a magneto-conductive continuous casting billet. The magnetostatic method comprises the following steps that a permanent magnet is arranged on the surface of a continuous casting billet in the continuous pulling down process, wherein the magnetization direction of the permanent magnet is perpendicular to the billet surface, to be detected, of the continuous casting billet to be detected; by utilizing calibration of a vibration mark-free continuous casting billet with the same material as the continuous casting billet to be detected, a force sensor is used to determine the counter-force F0' applied to the magnetostatic force F0 on a magnet; and the continuous casting billet, to be detected, with the vibration marks is determined and passes through the lower side of the permanent magnet, a bulge or a depression formed in the surface of the continuous casting billet to be detected can make the permanent magnet vary by subjecting to the counter-force F0' of the magnetostatic force, the force sensor which is connected with the end part of the permanent magnet is used to measure the counter-force F0' applied to the permanent magnet, and thus information of the vibration marks of the surface of the continuous casting billet to be detected is obtained. The magnetostatic method for online monitoring the vibration marks of the magneto-conductive continuous casting billet is simple and convenient, is accurate in result and can monitor variations of the vibration marks according to signal analysis on defects.