Reluctance Force Actuator
Interface between magnetic and mechanical progressive networks.
blockType: AcausalFoundation.Magnetic.Elements.ReluctanceForceActuator
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Description
The Reluctance Force Actuator unit represents the interface between magnetic and mechanical progressive networks.
The block is based on the following equations:
,
,
Where:
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- magnetic force;
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- flux through magnetic ports;
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- magnetic resistance;
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- thickness or length of the air gap;
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- magnetic constant;
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- relative magnetic permeability of the material;
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- cross-sectional area of the modelled element;
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- velocity.
Connections N and S are magnetic ports, and connections C and R are ports of mechanical translational motion. The magnetic force generated by the actuator tends to reduce the gap, so the resultant force is negative when it acts from C to R.
Key assumptions and limitations
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The excitation current in the system is constant.
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Only the axial magnetic flux is modelled.
Input
N - north terminal
magnetic
Magnetic port corresponding to the north terminal of the unit.
S is the south terminal
magnetic
Magnetic port corresponding to the south terminal of the unit.
C - housing
Mechanical progressive port corresponding to the housing.
R - stem
Mechanical progressive port corresponding to the stem.
Parameters
Initial air gap, m - initial air gap
`0.002 m (by default)
Length of the air gap at the beginning of the simulation.
Minimum air gap, m - minimum air gap
0.0000001 m (by default).
Minimum air gap value at which the gap is considered closed. The value of the parameter must be greater than 0.
Cross-sectional area, m² - cross-sectional area
0.01 m² (by default).
Cross-sectional area of the modelled element.
Relative permeability of material - relative magnetic permeability of material
1 (By default)
Relative permeability of material.
Contact stiffness, N/m - contact stiffness
`1000000 N/m (by default)
A stiffness that models the rigid stop at the position of minimum air gap.
Contact damping, N*s/m - contact damping
500 N*s/m (by default).
Damping that simulates a rigid stop at the position of minimum air gap.
Initial value of flux, Wb - initial value of magnetic flux
0 (By default).
Initial value of magnetic flux.
Initial value of MMF, A - initial value of magnetomotive force
0 (By default)
Initial value of magnetomotive force.
Initial value of force, N - initial value of force
0 (By default)
Initial value of force.
Initial value of relative velocity, m/s - initial value of relative velocity
0 (By default).
Initial value of relative velocity.