Hard Magnetic Material

 Description Typical values for remanence, coercivity, and the temperature coefficient of remanence are provided for common permanent magnetic materials.  The operating values are given by ${B}_{r}={B}_{r\left(\mathrm{ref}\right)}\left(1+{\mathrm{\alpha }}_{\mathrm{Br}}\left({T}_{\mathrm{op}}-{T}_{\mathrm{ref}}\right)\right)$ ${H}_{\mathrm{cB}}={H}_{\mathrm{cB}\left(\mathrm{ref}\right)}\left(1+{\mathrm{\alpha }}_{\mathrm{Br}}\left({T}_{\mathrm{op}}-{T}_{\mathrm{ref}}\right)\right)$ ${\mathrm{\mu }}_{r}=\frac{{B}_{r}}{{\mathrm{\mu }}_{0}{H}_{\mathrm{cB}}}$

Variables

 Name Units Description Modelica ID ${H}_{\mathrm{cB}}$ $\frac{A}{m}$ Coercivity at operating temperature H_cB ${B}_{r}$ $T$ Remanence at operating temperature B_r ${\mathrm{\mu }}_{r}$ $1$ Relative permeability at operating temperature mu_r

Parameters

 Name Default Units Description Modelica ID ${H}_{\mathrm{cB}\left(\mathrm{ref}\right)}$ $1$ $\frac{A}{m}$ Coercivity at reference temperature H_cBRef ${B}_{r\left(\mathrm{ref}\right)}$ $1$ $T$ Remanence at reference temperature B_rRef ${\mathrm{\alpha }}_{\mathrm{Br}}$ $0$ $\frac{1}{K}$ Temperature coefficient alpha_Br ${T}_{\mathrm{op}}$ $293.15$ $K$ Operating temperature T_op ${T}_{\mathrm{ref}}$ $293.15$ $K$ Reference temperature T_ref

Data

 Material ${H}_{\mathrm{cB}\left(\mathrm{ref}\right)}$ ${B}_{r\left(\mathrm{ref}\right)}$ ${T}_{\mathrm{ref}}$ ${\mathrm{\alpha }}_{\mathrm{Br}}$ ${T}_{\mathrm{op}}$ BaseData 1 1 293.15 0 293.15 NdFeB 900000 1.2 293.15 -0.001 293.15 Sm2Co17 750000 1.02 293.15 -0.0003 293.15 SmCo5 720000 0.95 293.15 -0.0004 293.15 PlasticNdFeB 400000 0.58 293.15 -0.001 293.15 PlasticSmCo 385000 0.57 293.15 -0.0004 293.15 HardFerrite 170000 0.38 293.15 -0.002 293.15 PlasticHardFerrite 130000 0.21 293.15 -0.002 293.15

 Modelica Standard Library The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.