EM_IPMSM_NL_001

Objective

Validation objective
Topology IPMSM
Model Types Electromagnetic subdomain model EM2.SPMSM
Electromagnetic linear magnetostatic FEM EM3.PMSM
Quantities Airgap radial and tangential magnet flux density waveforms
Geometry Internal rotor
Semi-closed slots
Winding Single layer non-overlapping windings with "alternate teeth wound"

Machine

This validation simulate a machine that can be found in the article : A. Rahideh and T. Korakianitis, “Analytical Magnetic Field Calculation of Slotted Brushless Permanent-Magnet Machines With Surface Inset Magnets,” vol. 48, no. 10, pp. 2633–2649, 2012.

This IPMSM (Inset Permanent Magnet Synchronous Machine) has 6 stator slots for 2 poles pairs (6s/4p). The airgap field computation is done in 4 distinct subdomains : airgap, stator slots, stator slots openings, and inset permanent magnet (IPM) with air space at each side.
Stator slots are filled with single layer non-overlapping "concentrated" tooth windings with "alternate teeth wound".
Armature field is null : no-load case.
The IPM magnetization pattern is radial magnetization.
An "exact" semi-analytical subdomain model was developped and compared to FEM.

Topology of machine IPMSM_001
Topology of machine IPMSM_001
Manatee model for machine IPMSM_001
Manatee model for machine IPMSM_001

Results

The same model is implemented on MANATEE. The figure below shows the comparison between airgap radial and tangential flux density waveforms obtained by both subdomain model and FEMM (See the different Electromagnetic Modules).

Publication Radial and Tangential airgap flux
Publication Radial and Tangential airgap flux
Radial and Tangential airgap flux at 0° comparison (FEMM vs Subdomain)
Radial and Tangential airgap flux at 0° comparison (FEMM vs Subdomain)
Radial and Tangential airgap flux at 45° comparison (FEMM vs Subdomain)
Radial and Tangential airgap flux at 45° comparison (FEMM vs Subdomain)

The subdomain model is very accurate and this enables to compute Maxwell forces along the airgap and determine electromagnetic forces.

Next