Tutorial summary | |
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Project name | tuto_BPMSM_02 |

Machine name | machine_BPMSM_A |

Source project | tuto_BPMSM_01 |

Description | This project aims at improving the calculation of the rotor mmf by using the automated call to the non linear magnetostatic model of FEMM. |

The project *tuto_BPMSM_01_test* is copied/pasted (or loaded and saved with the GUI) in a new project *tuto_BPMSM_02* will the following change:

`Input.Simu.type_rmmf_model = 2;`

The call to FEMM is very short and does not significantly change the overall computing time. The FEMM model is temporarily saved and should look like this:

The spatial flux distribution has a bit changed with non linear magnetostatics, it can be checked with (plot_B_space) :

The noise as a function of speed is now given by (plot_VS_ASWL_modal_cont) :

One can see that two main resonance occur with the breathing mode of the stack, respectively close to 3000 and 6000 rpm.

The frequency of the vibration waves responsible for the noise can be found looking at the spectrograms or using the order tracking analysis with (plot_VS_ASWL_order_analysis) :

The two force wave responsible for the two resonances have frequencies of 12fs and 24fs.

These conclusions show that at no-load up to 6500 rpm, the Prius electrical machine acoustic noise shows two resonances at 12th and 24th the electrical frequency with the breathing mode of the stack. This is in full agreement with the conclusions of this FEA work:

Running **a full electromagnetic and structural finite element model at variable speed requires several hours of calculation, while MANATEE only takes a few seconds to obtain the same conclusions**.