Magnetic Transient solution

Solutions > Electromagnetics > Magnetic Transient

Introduction

The Transient Magnetic application allows the study of the phenomena created by a time variable magnetic field. The magnetic field is related to the presence of variable currents (and possibly permanent magnets).This application allows the consideration of induced currents in conducting regions (Eddy currents). It also allows the consideration of skin effects and proximity effects in the conducting regions

2D 2D with skewed Motor
Note: More information about Skewed Motor option.
3D AxiSymmetric

The Transient Magnetic application can be used for different types of devices. We are principally interested in the study of devices supplied by current of varied shape (echelon, trapezoid…) or by transient phenomena (linked to current variation caused by powering, short circuits…)

The Transient Magnetic application is principally used with Circuit coupling and/or Kinematics coupling for rotating machines, transformers, etc. study in transient state.

Note: For more information about the Transient Magnetic workflow, please consult:

Solution dialog box

  • The transient solution is available for 2D, AxiSymmetric and 3D cases
  • In case of 2D the domain depth must be defined to consider the electromagnetic effects in the third dimension
  • In the case of transient magnetics, the user has a choice to select the driving transient variable or the control parameter. This can be in the general case Time or in the case of rotational motion (in the case of e-motors for example), the transient variable can be defined in terms of Angular position that defines the rotation or in the case of linear motion (for a linear actuator for example), the transient variable can be defined in terms of Linear position that defines the translation.
  • The transient control parameters can be defined in terms of the Final time and the Time increment used for discretization (it is the same principle for angular position and linear position parameters).
    Note: The Angular position and Linear position control parameters are not compatible with all Motion types. For more information, please refer to Motion

  • Specifically for the case of e-motors (only in 2D at this time), users can define multi-control to simultaneously calculate multiple working points defined by current, control angle and speed.

Automatic parameter creation

The creation of the transient magnetic solution now automatically creates some parameters that can be used to define multiparametric analysis.
  • Creation of the transient magnetic solution now automatically creates a variable Time


    The creation of this parameter is reflected in the output window.



    This parameter can be used to define transient quantities like current or voltage waveforms eg. I1 = MAX_CURRENT*SIN(OMEGA*Time+Gamma*PI/180).
    Note: The parameter does not reflect the actual values defined in the solution but only default values.
  • Creation of the the motion load named for instance Motion_1 now automatically creates three variable:
    • Angular_Position_Motion_1
    • Angular_Speed_Motion_1
    • ElecMag_Torque_Motion_1
    As for Time parameter, those variables can be used in formula to define quantities.
  • Creation of the multi control solution, by defining multiple working points creates the parameters RMS_Current, Speed and Gamma in addition to the Time parameter




    Note: The parameters do not reflect the actual values defined in the solution but only default values.

Typical examples

  • Typical example of a transient magnetic problem is shown below for a passive conductor which is not circuit linked.
    air or vacuum

    magnetic media

    (non conducting)

    conducting media

    (non magnetic) without Eddy current
    conducting media (magnetic or not) with possible Eddy current

  • Another example where the conductors are linked to an external circuit.

    air or vacuum

    magnetic media

    (non conducting)

    conducting media

    (non magnetic) without Eddy current
    conducting media (magnetic or not) with possible Eddy current