Japan
Japan

Aichi Steel ; TYO: 5482) is a Japanese steel manufacturer. It is a member of the Toyota Group. Wikipedia.

SEARCH FILTERS
Time filter
Source Type

Patent
Aichi Steel | Date: 2017-07-19

A magnetic field measurement device capable of accurate measurement of a magnetic field even after a sensitivity of an MI sensor varies is provided. A magnetic field measurement device (1) includes an MI sensor (2) and a sensitivity calculation means (3). The MI sensor (2) includes a magneto-sensitive body (20), a detection coil (21) and a magnetic field generation coil (22) that generates a magnetic field upon energization. The sensitivity calculation means (3) varies a current flowing in the magnetic field generation coil (22) in a state where an outside-sensor magnetic field H_(O) acting on the magneto-sensitive body (20) from outside the MI sensor (2) is constant. Consequently, the magnetic field acting on the magneto-sensitive body (20) is varied to calculate a sensitivity a by dividing a variation in an output voltage of the detection coil (21) by a variation in the magnetic field acting on the magneto-sensitive body (20).


Anisotropic rare earth magnet powder particles include R_(2)TM_(14)B_(1)-type crystals of a tetragonal compound consisting of one or more rare earth element, B, and one or more transition element, and enveloping layers containing at least Nd and Cu. Surfaces of the R_(2)TM_(14)B_(1)-type crystals are enveloped by the enveloping layers. The particles has an average crystal grain diameter of 0.05 to 1 m. The particles contain, when the whole particles are taken as 100 atomic %, 11.5 to 15 atomic % of total rare earth element (Rt); 5.5 to 8 atomic % of B; and about 0.05 atomic % to about 2 atomic % of Cu. The powder particles have an atomic ratio of Cu, which is a ratio of the total number of Cu atoms to a total number of atoms of Rt, falling within the range of 1 to 6%. The powder particles do not include dysprosium Dy, Tb, Ho and Ga. Coercivity of the magnetic powder is more than 955 kA/m.


A production method for an anisotropic bonded magnet includes: filling the annular cavity with a magnet raw material including one or more types of rare-earth anisotropic magnet powder and a binder resin; applying aligning magnetic fields to the magnet raw material being aligned in the softened or molten binder resin, the aligning magnetic fields are applied from an even number of aligning magnetic pole bodies arranged around outer periphery of the annular cavity such that directions of magnetic fields are alternated; subjecting the magnet raw material to a molding to form a compact; rotating the aligning magnetic pole bodies in circumferential direction for a predetermined angle; and applying demagnetization magnetic fields to the compact from the aligning magnetic pole bodies during the alignment step. The demagnetization magnetic fields are in directions for cancelling magnetization of the compact caused by the aligning magnetic fields.


Patent
Aichi Steel | Date: 2017-03-15

An object is to provide a magnetic detection device that can be reduced in size and thickness. The magnetic detection device (1) of the present invention comprises: a substrate (S); and a first magneto-impedance element (MI element) disposed at one surface side of the substrate and comprising a first magneto-sensitive wire (W1) and a first detection coil (C1). The first magneto-sensitive wire senses an external magnetic field component in a first axis direction in which the first magneto-sensitive wire extends. The first detection coil loops around the first magneto-sensitive wire. The first detection coil according to the present invention comprises a left-side coil part (C11) and a right-side coil part (C12) that coexist along the first magneto-sensitive wire, and is provided with a magnetic field direction changing body (F1) composed of a soft magnetic material of which at least a part is disposed at another surface side of the substrate or in the substrate above an intermediate position between the left-side coil part and the right-side coil part. The magnetic field direction changing body is able to change an external magnetic field component in a third axis direction intersecting the substrate to a measurement magnetic field component in the first axis direction. The external magnetic field component in the third axis direction is able to be detected on the basis of a left-side output obtained from the left-side coil part and a right-side output obtained from the right-side coil part.


An object is to provide a manufacturing method that allows an interior permanent magnet-type inner rotor to be obtained without occurrence of thermal demagnetization due to shrink fitting to a rotating shaft. The manufacturing method of the present invention is characterized by comprising: a shrink fitting step of heating a rotor core (1) having slots and inserting a rotating shaft (20) into a shaft hole to shrink-fit the rotor core ; and a filling step of filling the slots of the rotor core in a residual heat state after the shrink fitting step with a flowable mixture in oriented magnetic fields, the flowable mixture being a mixture of a binder resin heated to a flowable state and anisotropic magnet particles. This makes it possible to obtain, in similar manufacturing steps, an inner rotor (10) of which the magnetic poles are anisotropic bond magnets formed by solidifying the flowable mixture in the slots and a conventional inner rotor of which the magnetic poles are sintered magnets. As a result, it is also facilitated to produce both the inner rotors concurrently and in parallel (mixed flow production) in an already existing IPM motor manufacturing line.


Patent
Aichi Steel and Aichi Micro Intelligent Corporation | Date: 2016-09-28

A magnetic impedance sensor comprises an amorphous wire 1 of a magneto-sensitive material as the magneto-impedance element, a pulse oscillator means 2 that alternately reverses and outputs a basic pulse current and a compensating pulse current with polarity opposite to the basic pulse current in predetermined periods, and a signal processing means 3 that converts an alternate current voltage generated in response to a magnetic field intensity around the amorphous wire by a magnetic impedance effect of the amorphous wire according to the pulse current into a magnetic signal voltage in response to the magnetic field intensity, and outputs the magnetic signal voltage. Since the amorphous wire 1 is repeatedly reversely magnetized in the u and v circumferential directions, due to compensating the negative pulse current, the magnetic sensor with excellent linear characteristics are obtained.


Patent
Aichi Steel and Aichi Micro Intelligent Corporation | Date: 2016-03-22

A magnetic impedance sensor comprises an amorphous wire 1 of a magneto-sensitive material as the magneto-impedance element, a pulse oscillator means 2 that alternately reverses and outputs a basic pulse current and a compensating pulse current with polarity opposite to the basic pulse current in predetermined periods, and a signal processing means 3 that converts an alternate current voltage generated in response to a magnetic field intensity around the amorphous wire by a magnetic impedance effect of the amorphous wire according to the pulse current into a magnetic signal voltage in response to the magnetic field intensity, and outputs the magnetic signal voltage. Since the amorphous wire 1 is repeatedly reversely magnetized in the u and v circumferential directions, due to compensating the negative pulse current, the magnetic sensor with excellent linear characteristics are obtained.


Patent
Aichi Steel | Date: 2016-07-14

A rotation speed measuring system includes a magnetic sensor, an acceleration sensor, an end detecting unit, and a calculating unit. The magnetic sensor measures earth magnetism in at least one axis direction. The acceleration sensor measures acceleration in at least one axis direction. The end detecting unit detects a time point of a switch at which an acceleration variation is switched to a large-variation state after a small-variation state, wherein the small-variation state corresponds to a state in which the acceleration variation is equal to or below a predetermined first threshold value and the large-variation state corresponds to a state in which the acceleration variation is equal to or above a predetermined second threshold value. The calculating unit calculates the rotation speed of the ball moving in midair by analyzing a frequency of measurement data on the earth magnetism acquired by the magnetic sensor until the end time point.


Patent
Aichi Steel and Toyota Motor Corporation | Date: 2016-10-19

Provided is a CVT ring member 1 having a nitrided layer on a surface thereof. The CVT ring member 1 includes a chemical composition containing, by mass, C: 0.43 to 0.70%, Si: 2.50% or less, Mn: 1.00% or less, Cr: 1.50 to 4.00%, Mo: 0.50 to 3.00% and V: 1.00% or less while satisfying a relation of Formula 1: 159 C (%) + 91 Si (%) + 68 Cr (%) + 198 Mo (%) + 646 1,000, and the balance being Fe and unavoidable impurities. The ring member has a tensile strength of 1,700 MPa or more. The nitrided layer has a surface hardness of HV800 to HV950.


Patent
Aichi Steel and Toyota Motor Corporation | Date: 2016-01-27

A forged component having a chemical composition including, by mass%, C: 0.30 to 0.45%, Si: 0.05 to 0.35%, Mn: 0.50 to 0.90%, P: 0.030 to 0.070%, S: 0.040 to 0.070%, Cr: 0.01 to 0.50%, Al: 0.001 to 0.050%, V: 0.25 to 0.35%, Ca: 0 to 0.0100%, N: 0.0150% or less, and the balance being Fe and unavoidable impurities, and satisfying formula 1. Metal structure is a ferrite pearlite structure, and a ferrite area ratio is 30% or more. Vickers hardness is in the range of 320 to 380 HV. 0.2% yield strength is 800 MPa or more. A Charpy V-notch impact value is in the range of 7 to 15 J/cm^(2).

Loading Aichi Steel collaborators
Loading Aichi Steel collaborators