Inputs

Standard inputs

  1. Maximum phase current, rms

    The maximum phase current supplied to the machine: “Phase current rms” (Maximum phase current, rms value) must be provided.

  2. Maximum phase voltage, rms

    The maximum phase voltage supplied to the machine: “Phase voltage rms” (Maximum phase voltage, rms value) must be provided.

  3. Command mode
    The user can choose between two types of command modes:
    • Maximum Torque Per Voltage (MTPV)
    • Maximum Torque Per Amps (MPTA)
      Note: MTPV guarantees the maximum mechanical torque (or mechanical power) for each speed, considering the electrical limits established (i.e., max phase current and voltage). This command mode shows the full potential of the machine, but it is also the most difficult command mode to implement in terms of control and drive. On the contrary, MTPA is the easiest implementation for control and drive, but some regions of the torque-speed map that are attainable for MTPV are no longer available for a MTPA strategy.
  4. Speed

    The maximum “Speed” (Maximum speed) of the machine must be set.

Advanced inputs

The list of advanced inputs dedicated to this export are presented below.

For more details, please refer to the section dedicated to the "List of generic advanced inputs".
  1. Number of computations per electrical period

    The default value is equal to 30. The minimum allowed value is 13.

  2. Number of computations for Jd, Jq

    The default value is equal to 8. The minimum allowed value is 5.

  3. Number of computations for speed

    The default value is equal to 10. The minimum allowed value is 5.

  4. Mesh order

    The default level is second order mesh.

  5. Airgap mesh coefficient

    Airgap mesh coefficient is set to 1.5 by default.

Export inputs

This test offers an additional input in the export information.
  1. Generate Flux project.

    The FeMT project is automatically generated by the export process. The source Flux® 2D project is created, only if this input is set to “Yes”. Its default value is “No”.

List of generic advanced inputs

  1. Number of computations per electrical period

    The number of computations per electrical period “No. comp. / elec. period” (Number of computations per electrical period) influences the accuracy of results and the computation time.

    The default value is 50. The minimum allowed value is 13. This default value provides a good balance between the accuracy of results and computation time.

  2. Number of computed electrical periods

    The default value is 2. The minimum allowed value is 1 and the maximum value is equal to 10.

  3. Rotor initial position

    By default, the “Rotor initial position” is set to “Auto”.

    When the “Rotor initial position mode” is set to “Auto”, the initial position of the rotor is automatically defined by an internal process.

    The resulting relative angular position corresponds to the alignment between the axis of the stator phase 1 (reference phase) and the direct axis of the rotor north pole.

    When the “Rotor initial position” is set to “User input” (i.e. toggle button on the right), the initial position of the rotor considered for computation must be set by the user in the field « Rotor initial position ». The default value is equal to 0. The range of possible values is [-360, 360].

    For more details, please refer to the document: MotorFactory_2022.3_SMPM_IOR_3PH_Test_Introduction – section “Rotor and stator relative position”.

  4. Mesh order

    To get the results, the computation is performed using a Finite Element Modeling. The geometry of the machine is meshed.

    Two levels of meshing can be considered for this finite element calculation: first order and second order.

    This parameter influences the accuracy of results and the computation time.

    By default, second order mesh is used.

  5. Airgap mesh coefficient

    The advanced user input “Airgap mesh coefficient” is a coefficient which adjusts the size of mesh elements inside the airgap. When one decreases the value of “Airgap mesh coefficient”, the size of the mesh elements reduces, thus increasing the mesh density inside the airgap and the accuracy of results.

    The imposed Mesh Point (size of mesh elements touching points of the geometry) is described as:

    Mesh Point = (airgap) x (airgap mesh coefficient)

    Airgap mesh coefficient is set to 1.5 by default.

    The variation range of values for this parameter is [0.05; 2].

    0.05 gives a very high mesh density, and 2 gives a very coarse mesh density.
    CAUTION:

    Be aware, a very high mesh density does not always mean a better result quality. However, this always leads to a huge number of nodes in the corresponding finite element model. So, it means the need of huge numerical memory, which increase the respective computation time considerably.