A dynamic magnetic circuit calculation method for transient electromagnetic torque of a radial magnetic gear

By dividing the radial magnetic gear into a two-dimensional discrete mesh and reconstructing the dynamic flux source vector, and combining it with the Maxwell stress tensor method, the efficiency and accuracy problems of transient electromagnetic torque calculation for radial magnetic gears are solved. This achieves efficient and accurate magnetic field distribution and torque prediction, and is suitable for multi-objective optimization and parameter iteration.

CN122153221BActive Publication Date: 2026-07-21DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Filing Date
2026-05-08
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies suffer from long computation time and insufficient accuracy in calculating the transient electromagnetic torque of radial magnetic gears. In particular, when dealing with complex dual-rotor motion boundaries, finite element analysis consumes a lot of computing power, while traditional analytical methods are difficult to accurately simulate nonlinear magnetic flux changes.

Method used

By dividing a high-precision two-dimensional discrete mesh, assembling a global magnetic permeability sparse matrix, reconstructing the dynamic magnetic flux source vector by combining the reluctance series principle and kinematic equations, and performing efficient analytical integration by combining Maxwell's stress tensor method, the transient electromagnetic torque of the radial magnetic gear can be calculated.

Benefits of technology

It significantly improves computational efficiency, shortens the R&D cycle, and enhances computational accuracy. It can accurately capture nonlinear magnetic flux changes, provides clear physical intuition and parameterized scalability, and is suitable for performance evaluation of radial magnetic gears with different topological dimensions.

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Abstract

The present application belongs to the technical field of magnetic transmission and electromagnetic field numerical calculation, and relates to a dynamic magnetic circuit calculation method for transient electromagnetic torque of a radial magnetic gear. The steps are as follows: first, a two-dimensional grid model of the radial magnetic gear is established and physical material properties are assigned; second, grid element branch permeances are calculated and a global permeance sparse matrix is assembled; third, rotor positions are determined based on kinematic equations and equivalent magnetic flux source vectors are reconstructed; fourth, air gap magnetic flux density is solved and electromagnetic torque is calculated based on Maxwell stress tensor method. The dynamic magnetic circuit calculation method exhibits the characteristics of simplicity and convenience in practical engineering applications, and has excellent parameterization expandability and universality, and can flexibly adapt to performance evaluation of radial magnetic gears with different pole pair numbers and different topological sizes, providing a high-precision calculation tool with strong engineering universality for multi-objective optimization and parameter rapid iteration of magnetic gear transmission systems.
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