Motion

Analysis > Magnetic Transient Loads > Motion

Introduction

The Motion allows you to define the motion of some bodies of the solution.

Dialog Box

	Imposed position	Imposed speed	Coupled load
Translation
Rotation

• Select bodies which are moving. At least, one body must be selected.

• Motion Type: Two choices are proposed:

  • Translation

    Translation direction has to be chosen through Define/Modify Direction button:

    

  • Rotation

    Rotation axis has to be chosen through Define/Modify Axis button:

    

• Kinematic type: three choices possible
  • Imposed position

    The solving must be control by the time.

    The mechanical equations are not considered.

    Attention: If you use an imposed position, check that the solution is control by time and not by angle, it's mandatory to be able to solve.
    It's necessary to define:

    • initial Speed at t = 0s

    • the initial Imposed position at t = 0s
  • Imposed speed

    The moving part is considered as moving at a constant speed with respect to the fixed part. The computation of the electromagnetic field is carried out for the different positions defined by the imposed speed of the moving part. The mechanical equations are not considered.

    The solving could be control by time or by angle.

    It's necessary to define:

    • initial Position at t = 0s

    • the Imposed speed

  • Coupled load

    

    The moving part drives an external device that represents the mechanical load of the studied device.

    This is the model in which the magneto-mechanical coupling is considered, that is to say, both the magnetic aspects and the kinematic aspects of a problem

    • initial Speed at t = 0s

    • initial Position at t = 0s

    • Mechanical characteristics (Internal characteristics for the moving part and External characteristics for the coupled load):

      • Moment of inertia
      • Friction coefficients (3 coefficients)
• Air type: Two choices are proposed, available for both Translation and Rotation:
  • Immersion

    This air type is chosen when the moving bodies are immersed into a large air volume.

    Mostly used for sensors and actuator applications.

  • Sliding

    This air type is chosen when the moving bodies are sliding with respect to the fixed part. The sliding surface is located inside the airgap and separates the airgap into two bodies: moving airgap and fixed airgap.

    Mostly used for eMotor cases.

Examples

• Motion with Imposed speed

• Motion with Coupled load (without friction)

• An example to see the move of the bodies after a solving.