What are the main input needed to run a MANATEE e-NVH simulation?

Objectives

This article shows what key input parameters are necessary to run MANATEE software dedicated to the fast NVH simulation of electrical machines.

Basic 2.5D e-NVH simulation

  • slot/pole combination
  • rotor & stator lamination dimensions (inner, outer diameters)
  • winding type (distributed, concentrated - see winding set-up in MANATEE) and number of turns per coil
  • nominal phase current (e.g. Id/Iq function of speed)
  • skewing pattern

With these few input parameters, the main e-machine structural modes can be estimated (based on MANATEE default material properties), the key electromagnetic excitations are quickly captured using semi-analytic electromagnetic models combined with load extrapolation technique, and the resonances with purely extensional 2D lamination modes can be predicted.

Intermediate 2.5D e-NVH simulation

  • lamination detailed drawings (.dxf of one rotor pole or one stator slot pitch, where edge is aligned with y=0 axis, for complex lamination geometries that are not present in MANATEE overlay library)
  • B(H) curve of the magnetic materials
  • torque / speed curve to be followed when iterating on Equivalent Electrical Circuit
  • temperature of magnetic materials
  • detailed winding diagram and wire dimensions
  • end-winding geometry
  • commutation strategy as a function of speed (e.g. SPWM, SVPWM, DPWM)
  • Yound modulus of materials (e.g. magnet, stator laminates orthotropic properties)
  • bill of materials
  • housing drawings

With these additional parameters, MANATEE can calculate more accurately the magnetic loads (e.g. using optimized coupling with FEMM) including commutation effects. The natural frequencies are also more accurately estimated by calculating more precisely the winding mass and including a cylindrical shell model of the housing.

Advanced 3D e-NVH simulation

  • 3D mechanical FEA model of e-powertrain (e-motor, gearbox)
  • static & dynamic eccentricity levels
  • airgap roundness
  • magnetization measurements

With these additional parameters, MANATEE can be coupled to a 3D mechanical model (e.g. Optistruct, Ansys, Abaqus) or vibroacoustic model (e.g. Actran) and excite separately the rotor & stator using Electromagnetic Vibration Synthesis method. The dynamic behaviour is finely captured and both structure borne and air borne paths are characterized, as well as torque ripple, radial ripple and UMP effects in case of asymmetries (e.g. uneven airgap or magnetization).

See also

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