3 results about "Transient field" patented technology

The invention discloses a method and equipment for calculating a correlation coefficient of an S-FDTD transient field, and belongs to the technical field of radio wave propagation calculation, when the S-FDTD method based on Taylor expansion is adopted to solve a transient field problem, the correlation coefficient in the S-FDTD method is pre-estimated based on an NIPC method, so that the S-FDTD method can be used for high-precision simulation of transient field random performance. Results show that the method can obtain a proper correlation coefficient at a low cost, compared with a 5000-time Monte Carlo method, the calculation sample number of the method is about five thousandths, meanwhile, when the S-FDTD method is used for steady-state field simulation, the method can also be expanded and applied to a steady-state field, the S-FDTD method does not need to wait for the field to enter a steady state, and the time consumption is less than that of MC-CC.

The application provides a transformer optimization design method and device based on a combined simulation strategy, and belongs to the field of power electronics. The method provided by the application comprises the following steps: establishing a three-dimensional simple geometric model of a transformer; obtaining an excitation waveform reflecting the actual working state of the transformer; performing first eddy current field simulation on the three-dimensional simple geometric model, importing the generated adaptive grid into a transient field, applying the excitation waveform to carry out transient magnetic field simulation, adjusting the cross-sectional area of a magnetic core or the number of turns of a winding according to the magnetic flux density distribution, and determining the structure of the magnetic core; establishing a two-dimensional cross-sectional model of a winding stack based on the confirmed magnetic core structure, performing two-dimensional magnetic field simulation, comparing the loss and current density trends, and screening the optimal winding configuration; combining the confirmed magnetic core and the optimal winding to construct a three-dimensional fine model, obtaining a first grid through second eddy current field simulation, and importing the first grid into a transient field to complete final performance verification. The method and device provided by the application can improve the simulation efficiency and design accuracy, and shorten the development cycle.

The invention relates to a transient electromagnetic field-circuit coupling high-precision calculation method based on an A-alpha formula, and the method comprises the steps: dividing grid data into a plurality of polyhedral smooth regions with corresponding edges as centers according to the edges in the grid data of a three-dimensional motor 1 / 8 periodic model; a smooth vector shape function of edges and a smooth shape function of nodes in the polyhedron smooth domain are calculated; constructing a transient field-circuit coupling equation set based on an A-alpha formula, transient eddy current and coulomb specifications, and rewriting the transient field-circuit coupling equation set according to the smooth vector shape function of each edge, the smooth shape function of each node and a Galerkin method to obtain a transient field-circuit coupling system equation; further rewriting the transient field-circuit coupled system equation into a Newton iteration linear equation; and iteratively solving the Newton iteration linear equation by adopting a Newton iteration method until the Newton iteration linear equation converges to obtain a magnetic vector bit in field-circuit coupling, thereby realizing high-precision numerical solution of the transient field-circuit coupling problem in the complex motor system.