Three types of analysis are used in MotorWizard.
This analysis is based on the well-known analytical models of the machine developed in the recent up-to-date scientific literature. The models utilize detailed geometry of the machine plus winding structure to estimate machine parameters such as back EMF constant, stator phase resistance and different inductance. Using materials properties, the core loss is also estimated by this model.
The estimated parameters are used to predict the steady-state performance of the machine such as
Torque-Speed curve,
Input and Output Powers vs Speed
Efficiency Map
This type of analysis helps user to get a general understanding of steady-state machine performance in a very short time to see if the designed machine meets the design requirements such as torque, power and efficiency.
This is a combination of analytical and finite element analysis. In this case, finite element analysis is used to estimate airgap flux density and inductance of the phases. These results along with analytically calculated stator resistance is used to estimate back EMF constant and consequently predict steady state performance of the machine similarly to analytical analysis.
Finite element analysis is a numerical method to analyze the performance of electrical machine. It has ability to include detailed geometry of rotor and stator, winding distribution, slotting effect and electromagnetic properties of material in the analysis. Therefore, it provides the most accurate type of results. In MotorWizard, the Magnetostatic finite element analysis is used to provide the different results at different operating condition of the machine. Results at no-load and loaded conditions are the most desirable ones, however, the results are not limited to them and some performance characteristics analysis is also available. Unlike analytical and semi-analytical analysis which are mostly based on steady-state results and average (or RMS) values of parameters, direct effects of different features of machine such as geometry, complexity and electromagnetic properties of material can be observed on finite element results such as back EMF waveform and torque ripple profiles.
Some interesting results using finite element analysis which are available in MotorWizard are:
Winding Flux Linkage Waveform
Back EMF Waveforms
Cogging Torque
Inductance Profile
Torque and Torque Ripple
Magnetic Flux Density Distribution
The proper scenarios are defined and implemented in MotorWizard to simplify the process of analysis for achieving these results. Generating meshes and applying boundary conditions are optimized and conducted automatically to obtain the most accurate results in a short time.
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