Fundamental Reluctance
R2026bSimplified implementation of magnetic reluctance
Fundamental Reluctance block
To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.
Libraries:
Simscape /
Foundation Library /
Magnetic /
Magnetic Elements
Description
The Fundamental Reluctance block provides a simplified model of a magnetic reluctance, that is, a component that resists flux flow. Unlike the Reluctance block, which computes reluctance based on the geometry of the section being modeled, the Fundamental Reluctance block lets you specify a value of reluctance directly as a block parameter.
The block uses the equation
where:
MMF is the magnetomotive force (mmf) across the component.
Φ is the flux through the component.
is the reluctance.
Connections N and S are magnetic conserving ports. The mmf across the reluctance is , and the sign of the flux is positive when it flows through the device from N to S.
Variables
To set the priority and initial target values for the block variables prior to simulation, use the Initial Targets section in the block dialog box or Property Inspector. For more information, see Set Priority and Initial Target for Block Variables.
Nominal values provide a way to specify the expected magnitude of a variable in a model. Using system scaling based on nominal values increases the simulation robustness. Nominal values can come from different sources, one of which is the Nominal Values section in the block dialog box or Property Inspector. For more information, see Modify Nominal Values for a Block Variable.
Examples
Electrical Transformer
Model a transformer using fundamental magnetic library blocks. The transformer is rated 50W, 60 Hz, 120V/12V and assumed to have an efficiency of 94%, no-load magnetizing current of 1% and a leakage reactance of 2.3%. Core losses are not modeled and the core material B-H characteristic is assumed to be linear.
Ports
Conserving
Parameters
Extended Capabilities
Version History
Introduced in R2014a
