Simulation ServiceDuring the development of a magnetic product, electromagnetic simulation plays a more important role than ever. By repeatedly optimizing the geometric and magnetic structure, the development cycle will be dramatically reduced. However, the nonlinear property of hard magnetic material makes the problem more complicated, when the anisotropic orientation is expected as spacevariated. Hence, it is quite difficult to estimate the saturation and final open/closed loop magnetic field distribution. 

Simulation service provides:


ApplicationAssigned by our client, Wtesting shall analyze the saturation and orientation of hard magnetic material as well as the final open loop magnetic field strength density, based on a given nonlinear magnetic property. Therefore, this task shall solve the following problems:
Modelling of nonlinear material propertyA magnetization curve of a typical hard magnetic material starts from the origin and along the hysteresis in the first quadrant until it reaches the saturation point. After this point, the permeability of the material can be approximated as µ_{0}.B = J + µ_{0}HJ is the magnetization of the hard magnetic material.Magnetization of a typical hard magnetic material Saturation analysis of magnetizationfrom the equation above, it is quite easy to convert the magnetic field to the saturation of each point inside the material.J = B  µ_{0}HXaxis is the angle position around circumference [°]; Yaxis is the radial position [mm]; on the right side, the scale indicates magnetization(saturation) [T]; this application is a radial ring magnet with 3polepairs. Open loop magnetic field analysis of hard magnetic materialBased on the result in the last process, the same operation can be applied to each component of vector field to obtain the orientation of magnetization.J_{x} = B_{x}  µ_{0}H_{x}J_{y} = B_{y}  µ_{0}H_{y}At last, the results of orientation and strength of magnetization are converted to the vector of Hc to apply in the FEM simulation model. After solving the problem:On the left side, the graphic is the distribution of flux lines; and on the right side, the graphic is the vector field distribution. Distribution of magnetic field strength density B Comparison of simulation and measurement resultto to be comparable with measuremen, the simulation is evaluated the normal component of magnetic field strength density B on the surface with 1mm distance (red circle in the picture above) from the magnet. It shows that the simulation is 35% stronger than the measurement.左侧为仿真结果，右侧为实验测得结果 