Decoupled determination of magnetostriction and inverse magnetostriction

10545,061

15/679497

August 17, 2017

Rapid calculation of magnetostriction effects can consist of calculating a stress field and a magnetic field in a structure by determining a magnetic field on the magnetic mesh, determining a magnetostriction from the magnetic field, applying the magnetostriction to the mechanical mesh, determining a stress field on the mechanical mesh, determining an inverse magnetostriction from the stress field, applying the inverse magnetostriction to the magnetic mesh, and determining a new magnetic field on the magnetic mesh by accounting for the inverse magnetostriction. Calculations can be based on data representing a structure, including a magnetic mesh, a mechanical mesh, and a plurality of material properties. After calculation is completed, data characterizing the calculated stress field and magnetic field for the structure can be provided as output. Related apparatus, systems, techniques, methods and articles are also described.

Ansys, Inc. (Canonsburg, PA, US)

Ansys, Inc. (Canonsburg, PA, US)

1. A computer-implemented method for rapid calculation of magnetostriction effects comprising: receiving data representing a structure, the data comprising a magnetic mesh, a mechanical mesh, and a plurality of material properties; calculating, using the received data, a stress field and a magnetic field for the structure by: determining a magnetic field on the magnetic mesh; determining a magnetostriction from the magnetic field; applying the magnetostriction to the mechanical mesh; determining a stress field on the mechanical mesh; determining an inverse magnetostriction from the stress field; applying the inverse magnetostriction to the magnetic mesh; determining a new magnetic field on the magnetic mesh by accounting for the inverse magnetostriction; and providing data characterizing the calculated stress field and magnetic field for the structure.

2. The method of claim 1 , wherein a plurality of material properties comprises a magneto-mechanical coupling coefficient.

3. The method of claim 2 , wherein the magneto-mechanical coupling coefficient is dependent on the stress field, and wherein determining the magnetic field comprises: mapping the stress field onto the magnetic mesh; and treating the stress field as a pre-stress.

4. The method of claim 1 , wherein determining the new magnetic field on the magnetic mesh comprises reconstructing of a magnetic permeability to account for the inverse magnetostriction.

5. The method of claim 4 , wherein the magnetic permeability is isotropic before reconstructing.

6. The method of claim 4 , wherein the magnetic permeability becomes anisotropic after reconstructing.

7. The method of claim 1 , wherein the magnetic field and the stress field change with time, wherein determining the magnetic field comprises a calculation with a magnetic time constant, wherein determining the stress field comprises a calculation with a stress time constant, and wherein the magnetic time constant is smaller than the stress time constant.

8. The method of claim 1 , further comprising repeating the calculating step until a converged solution is reached.

9. The method of claim 1 , wherein operations on the mechanical mesh are performed using a first simulator operating on a first processing system and wherein operations on the magnetic mesh are performed using a second simulator operating on a second processing system.

10. The method of claim 9 , wherein the first simulator and the second simulator offer in parallel at some point in time during the method.

11. The method of claim 1 , wherein the received data is representative of a physical system that exists or that is being designed.

12. The method of claim 1 , wherein the data characterizing the calculated stress field and magnetic field is used to build a component of a physical system or to modify an existing physical component.

13. A computer system to customize software configuration, comprising: a memory to store data comprising a magnetic mesh, a mechanical mesh, and a plurality of material properties; and a processor to: calculate, using the data, a stress field and a magnetic field for the structure by: determining a magnetic field on the magnetic mesh; determining a magnetostriction from the magnetic field; applying the magnetostriction to the mechanical mesh; determining a stress field on the mechanical mesh; determining an inverse magnetostriction from the stress field; applying the inverse magnetostriction to the magnetic mesh; determining a new magnetic field on the magnetic mesh; and provide data characterizing the calculated stress field and magnetic field for the structure.

14. The computer system of claim 13 , wherein a plurality of material properties comprises a magneto-mechanical coupling coefficient.

15. The computer system of claim 14 , wherein the magneto-mechanical coupling coefficient is dependent on the stress field, and wherein the processor maps the stress field onto the magnetic mesh and treats the stress field as a pre-stress.

16. The computer system of claim 13 , wherein the processor determines the new magnetic field on the magnetic mesh by reconstructing a magnetic permeability to account for the inverse magnetostriction.

17. The computer system of claim 16 , wherein the magnetic permeability is isotropic before reconstructing.

18. The computer system of claim 16 , wherein the magnetic permeability becomes anisotropic after reconstructing.

19. The computer system of claim 13 , wherein the magnetic field and the stress field change with time, wherein the processor determines the magnetic field by calculation with a magnetic time constant and determines the stress field by calculation with a stress time constant, and wherein the magnetic time constant is smaller than the stress time constant.

20. The computer system of claim 13 , where the processor continues to calculate until a converged solution is reached.

21. A computer-implemented method for rapid calculation of magnetostriction effects comprising: receiving data representing a structure, the data comprising a magnetic mesh, a mechanical mesh, and a plurality of material properties; calculating, using the received data, a stress field and a magnetic field for the structure by: applying a determined magnetostriction based on a determined magnetic field to the mechanical mesh; applying a determined inverse magnetostriction based on a determined stress field to the determined magnetic mesh; determining a new magnetic field on the magnetic mesh; and providing data characterizing the calculated stress field and magnetic field for the structure.

22. A computer-implemented method for rapid calculation of magnetostriction effects comprising: receiving data representing a structure, the data comprising a magnetic mesh, a mechanical mesh, and a plurality of material properties, wherein the magnetic mesh is different from the mechanical mesh and wherein the plurality of material properties comprises an isotropic magnetic permeability, a first magneto-mechanical coupling coefficient, and a second magneto-mechanical coupling coefficient; calculating, using the received data, a stress field and a magnetic field for the structure by: determining a magnetic field on the magnetic mesh by solving a magnetic field equation using the isotropic magnetic permeability and a magnetic time constant; determining a magnetostriction from the magnetic field as a product of the first magneto-mechanical coupling and the magnetic field; applying the magnetostriction to the mechanical mesh by mapping the magnetostriction from the magnetic mesh to the mechanical mesh; determining a stress field on the mechanical mesh by solving a strain-stress equation with the magnetostriction using a mechanical time constant, wherein the mechanical time constant is substantially larger than the magnetic time constant; determining an inverse magnetostriction from the stress field as a product of the second magneto-mechanical coupling and the stress field; applying the inverse magnetostriction to the magnetic mesh by mapping the inverse magnetostriction from the mechanical mesh to the magnetic mesh; determining a new magnetic field on the magnetic mesh using the magnetic time constant by mapping the stress field onto the magnetic mesh, treating the stress field as a pre-stress, and reconstructing the isotropic magnetic permeability to account for the inverse magnetostriction such that the reconstructed magnetic permeability is anisotropic; repeating the calculating until a converged solution is reached; and providing data from the converged solution characterizing the calculated stress field and magnetic field for the structure.

8855978 October 2014 Uehara
2013/0006593 January 2013 Uehara
2018/0188335 July 2018 Tago

Lin et al., “A new nonlinear anisotropic model for soft magnetic materials”, IEEE Transactions on Magnetics, vol. 42, Iss. 4, Apr. 2006, Published Mar. 20, 2006. (Year: 2006). cited by examiner

edspgr.10545061