Magnet

Here are the properties that can be edited in a magnet:

Description

Label Unit
Author *
Manufacturer *
Price USD/kg
Reminder *

Mechanic

Label Unit
Mass density kg/m3

Electric

Label Unit
Reference temperature (Tref) °C
Isotropic resistivity at Tref. Ohm*m
Temperature coefficient at Tref. 1/K

Magnetic

Label Unit
Reference temperature (Tref) °C
Remanent induction Br at Tref T
Reverse temperature coefficient α for Br 1/K
Relative permeability μ r 1
Intrinsic Coercivity HcJ at Tref A/m
Reverse temperature coefficient b for HcJ 1/K
Energy product (B.H) max J/m3
Normal coercivity field Hcb at Tref A/m
Maximum operating temperature °C
Curie temperature °C

Thermic

Label Unit
Reference temperature (Tref) °C
Isotropic thermal conductivity at Tref W/K/m
Specific heat at Tref J/K/Kg

Operating conditions

Label Unit
Temperature °C
Load line permeance coefficient 1
Note: The relations between the remanent flux density, the intrinsic coercivity and the temperature are described in the Advanced section: “Impact of temperature on physical properties”.
Note: The thermal conductivity of the magnet regions is independent of temperature.

How to manage magnet parameters ?

Here is the list of user parameters related to the magnetic behavior of magnets.

Label Definition
T REF Reference temperature.
Br at T REF Remanent induction at T REF.
α Reverse temperature coefficient for Br.
μ r Relative permeability.
HcJ Intrinsic coercivity at T REF.
β Reverse temperature coefficient for HcJ.
(B.H) max Energy product. Disabled input field, value deduced from other inputs.
Hcb Normal coercivity at T REF. Disabled input field, value deduced from other inputs.
* Maximum operating temperature. Just for information, not used in computations.
* Curie temperature. Just for information, not used in computations.
Table 1. Presentation of the magnet family properties in “Materials”


1 Category dedicated to magnetic properties.
Note: Magnetic properties are linked to the data set in the “Operating Conditions” (See item 10 for “Operating”).
2 Input parameters are written in the input area.
3 Remanent flux density (Br).
4 Normal coercivity (Hcb).
5 B(H) curve for the magnet (in blue).
6 Intrinsic coercivity (HcJ).
7 Isoline (B.H) max. (in red).
8 Load line for the defined permeance coefficient (in green).
9 Operating point for the given permeance coefficient and temperature.
10
Temperature and permeance coefficient of the magnetic circuit are defined as “operating conditions” of the magnets. These can be edited in the dedicated tab “Operating”. Any changes will automatically update the output.
Note: These features have no influence on the magnet’s physical properties, but these are useful to display its behavior when working at this operating point.