Engee documentation

Reluctance Force Actuator

The interface between magnetic and mechanical translational networks.

blockType: AcausalFoundation.Magnetic.Elements.ReluctanceForceActuator

reluctance force actuator

Path in the library:

/Physical Modeling/Fundamental/Magnetic/Elements/Reluctance Force Actuator

Description

Block Reluctance Force Actuator It is an interface between magnetic and mechanical translational networks.

The block is based on the following equations:





where

  • — magnetic force;

  • — flow through magnetic ports;

  • — magnetic resistance;

  • — the length of the air gap;

  • — magnetic constant;

  • — relative magnetic permeability of the material;

  • — the cross-sectional area of the modeled element;

  • — speed.

Connections N and S are magnetic ports, and connections C and R are mechanical translational ports. The magnetic force generated by the actuator tends to reduce the gap, so the resulting force is negative when it acts from C to R.

Key assumptions and limitations

  • The excitation current in the system is constant.

  • Only the axial magnetic flux is modeled.

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

# R — stock
translational mechanics

Details

Mechanical translational port corresponding to the rod.

Program usage name

rod_flange

# C — housing
translational mechanics

Details

Mechanical translational port corresponding to the body.

Program usage name

case_flange

Parameters

Parameters

# Initial air gap — initial air gap
m | um | mm | cm | km | in | ft | yd | mi | nmi

Details

The length of the air gap at the beginning of the simulation.

Units

m | um | mm | cm | km | in | ft | yd | mi | nmi
Default value

2.0 mm
Program usage name

initial_gap
Evaluatable

Yes

# Minimum air gap — minimum air gap
m | um | mm | cm | km | in | ft | yd | mi | nmi

Details

The minimum value of the air gap at which the gap is considered closed. The parameter value must be greater than 0.

Units

m | um | mm | cm | km | in | ft | yd | mi | nmi
Default value

0.0001 mm
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 magnetic permeability of the material

Details

Relative permeability of the material.

Default value

1
Program usage name

mu_r
Evaluatable

Yes

# Contact stiffness — contact stiffness
N/m | mN/m | kN/m | MN/m | GN/m | kgf/m | lbf/ft | lbf/in

Details

Stiffness, which simulates a rigid stop in the position of the minimum air gap.

Units

N/m | mN/m | kN/m | MN/m | GN/m | kgf/m | lbf/ft | lbf/in
Default value

1000000 N/m
Program usage name

k_contact
Evaluatable

Yes

# Contact damping — contact damping
N*s/m | kgf*s/m | lbf*s/ft | lbf*s/in

Details

Damping, which simulates a rigid stop at the minimum air gap position.

Units

N*s/m | kgf*s/m | lbf*s/ft | lbf*s/in
Default value

500 N*s/m
Program usage name

C_contact
Evaluatable

Yes

Examples