A calculating method for ultimate demagnetization temperature of loudspeaker magnetic steel includes drawing a 2D or 3D geometric model view of the system; importing the performance parameter of magnetic steel and designing variables to be solved and formulas; establishing a finite element model for the system according to the imported performance parameter of magnetic steel, variables and formulas; solving and conducting a steady-state analysis of the finite element model for a coordinate (Hn, Bn), a loadline slope Pc value and an ultimate demagnetization temperature value of the operation point under 20 C. on BH curve by calculating; obtaining a demagnetization curve view with post-treatment. Thus, a value of loadline slope Pc is obtained, and the ultimate demagnetization temperature of loudspeaker magnetic steel can be obtained importing the variables and formulas into FEA simulation through the temperature coefficient of magnetic steel and by the solution and steady-state analysis using COMSOL Multiphysics software.

A mobile transformer test device (10) for testing a power transformer (40) has connectors (12) for the detachable connection of the transformer test device (10) to the power transformer (40). The transformer test device (10) has a source (5) for generating a test signal. The mobile transformer test device (10) has an evaluation circuit (6) for determining, based on the test signal and a test response of the power transformer (40), information regarding a B-H curve (50, 60) of the power transformer (40).

A mobile transformer test device (10) for testing a power transformer (40) has connectors (12) for the detachable connection of the transformer test device (10) to the power transformer (40). The transformer test device (10) has a source (5) for generating a test signal. The mobile transformer test device (10) has an evaluation circuit (6) for determining, based on the test signal and a test response of the power transformer (40), information regarding a B-H curve (50, 60) of the power transformer (40).

A method for measuring a temperature of magnetic junction switchable using spin transfer. The magnetic junction includes at least one magnetic layer. The method includes measuring a temperature variation of at least one magnetic characteristic for the magnetic layer(s) versus temperature. The method also includes measuring a bias variation in the magnetic characteristic versus an electrical bias for the magnetic junction. This measurement is performed such that spin transfer torque-induced variation(s) in the magnetic characteristic(s) are accounted for. The temperature versus the electrical bias for the magnetic junction is determined based on the temperature variation and the bias variation.

A method for measuring a temperature of magnetic junction switchable using spin transfer. The magnetic junction includes at least one magnetic layer. The method includes measuring a temperature variation of at least one magnetic characteristic for the magnetic layer(s) versus temperature. The method also includes measuring a bias variation in the magnetic characteristic versus an electrical bias for the magnetic junction. This measurement is performed such that spin transfer torque-induced variation(s) in the magnetic characteristic(s) are accounted for. The temperature versus the electrical bias for the magnetic junction is determined based on the temperature variation and the bias variation.

Various embodiments are described that relate to a detector. The detector can include a loop functioning at a high frequency that emits a magnetic field. The magnetic field can be retrieved and a comparison can be made between the emitted magnetic field and the retrieved magnetic field. If there is substantially little difference between the emitted and retrieved field, then a determination can be that no object is present. Conversely, if there is a substantial difference between the emitted and retrieved field, then the determination can be that an object is present and thus the object is detected. If the object is present, the returned magnetic field can be further analyzed to determine the type of object that is detected.

A system for magnetic characterization of an induction heating wire including a conductor having a first end and a second end longitudinally opposed from the first end, wherein the induction heating wire extends along a portion of the conductor and is electrically isolated from the conductor, an alternating current power source electrically coupled with the conductor to pass an electric current between the first end and the second end, a current sensor positioned to sense the electric current, a sensing wire including a first lead and an opposed second lead, wherein the sensing wire defines a first loop having a first polarity and a second loop having a second, opposite polarity, the second loop being connected to the first loop at a crossover, and wherein the induction heating wire extends through the first loop, and a voltage sensor positioned to sense a voltage across the first lead and the second lead.

A system for magnetic characterization of an induction heating wire including a conductor having a first end and a second end longitudinally opposed from the first end, wherein the induction heating wire extends along a portion of the conductor and is electrically isolated from the conductor, an alternating current power source electrically coupled with the conductor to pass an electric current between the first end and the second end, a current sensor positioned to sense the electric current, a sensing wire including a first lead and an opposed second lead, wherein the sensing wire defines a first loop having a first polarity and a second loop having a second, opposite polarity, the second loop being connected to the first loop at a crossover, and wherein the induction heating wire extends through the first loop, and a voltage sensor positioned to sense a voltage across the first lead and the second lead.

A simulation method for causing a computer to execute a process, the process includes: calculating, based on information associated with edge elements with which an acquired calculation target is modeled and information of Gaussian numerical integration points in a cell element surrounded by the plurality of edge elements, using a finite element method, a magnetic flux density vector for each of the Gaussian numerical integration points, and calculating a magnetization vector for each of the Gaussian numerical integration points, based on the magnetic flux density vector and a plurality of microscopic magnetization vectors associated with the Gaussian numerical integration points.

A simulation method for causing a computer to execute a process, the process includes: calculating, based on information associated with edge elements with which an acquired calculation target is modeled and information of Gaussian numerical integration points in a cell element surrounded by the plurality of edge elements, using a finite element method, a magnetic flux density vector for each of the Gaussian numerical integration points, and calculating a magnetization vector for each of the Gaussian numerical integration points, based on the magnetic flux density vector and a plurality of microscopic magnetization vectors associated with the Gaussian numerical integration points.