Variable Reluctance

Variable magnetic resistance.

blockType: AcausalFoundation.Magnetic.Elements.VariableReluctance

Path in the library:

/Physical Modeling/Fundamental/Magnetic/Elements/Variable Reluctance

Description

Block Variable Reluctance It is an alternating magnetic resistance, that is, a component that resists magnetic flux. The ratio of the magnetomotive force (MDS) on the component to the resulting flow flowing through the component is defined as resistance and depends on the value of the input signal.

The block is based on the following equations:

where

— magnetomotive force (MDS) on the component;
— flow through magnetic ports;
— magnetic resistance;
— the value of the thickness of the magnetic material at the input port IN_1;
— magnetic constant;
— relative magnetic permeability of the material;
— the cross-sectional area of the modeled element.

The N and S connections are magnetic ports. The MDS through resistance is determined by the expression , and the sign of the magnetic flux is positive when flowing from N to S.

Variables

Use the parameter group Initial Targets to set the priority and initial target values for the block parameter variables before modeling. For more information, see Configuring physical blocks using target values.

Ports

Conserving

# N — north terminal
magnetism

Details

The magnetic port corresponding to the north terminal of the unit.

Program usage name

port_n

# S — south terminal
magnetism

Details

The magnetic port corresponding to the southern terminal of the unit.

Program usage name

port_s

Input

# IN_1 — Input signal
scalar

Details

The input port that sets the value of the thickness of the magnetic material.

Data types	`Float64`
Complex numbers support	I don’t

Parameters

# Mimimum length or thickness X>=0 — minimum clearance
m | um | mm | cm | km | in | ft | yd | mi | nmi

Details

The minimum value of the thickness of the magnetic material. If the input signal drops below this level (for example, it becomes negative), the minimum value is used. The parameter value must be non-negative.

Units	`m` \| `um` \| `mm` \| `cm` \| `km` \| `in` \| `ft` \| `yd` \| `mi` \| `nmi`
Default value	`0 m`
Program usage name	`min_gap`
Evaluatable	Yes

# Cross-sectional area — cross-sectional area
m^2 | um^2 | mm^2 | cm^2 | km^2 | in^2 | ft^2 | yd^2 | mi^2 | ha | ac

Details

The cross-sectional area of the modeled element.

Units	`m^2` \| `um^2` \| `mm^2` \| `cm^2` \| `km^2` \| `in^2` \| `ft^2` \| `yd^2` \| `mi^2` \| `ha` \| `ac`
Default value	`0.01 m^2`
Program usage name	`A`
Evaluatable	Yes

# Relative magnetic permeability of material — relative permeability of the material

Details

The relative magnetic permeability of the material. Meaning 1 corresponds to the air.

Default value	`1`
Program usage name	`mu_r`
Evaluatable	Yes

Examples

Step-down transformer