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Rotational Spring

Ideal spring in mechanical rotational systems


Mechanical Rotational Elements

  • Rotational Spring block


The Rotational Spring block represents an ideal mechanical rotational linear spring, described with the following equations:





TTorque transmitted through the spring
KSpring rate
φRelative displacement angle (spring deformation)
φinitSpring preliminary winding (spring offset)
φR, φCAbsolute angular displacements of terminals R and C, respectively
ωRelative angular velocity

The block positive direction is from port R to port C. This means that the torque is positive if it acts in the direction from R to C.


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.


Spring rate

Spring rate. The default value is 10 N*m/rad.


The block has the following ports:


Mechanical rotational conserving port.


Mechanical rotational conserving port.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2007a