Design Performance Comparison of Surface and Interior Permanent Magnet Transverse Flux Motors
Lavanya Vadamodala, Senior Application Engineer, Altair Engineering, Inc.


Transverse Flux Permanent Magnet Machines (TFPMMs) are known for their capability to produce high power with high torque density but with a lower power factor. TFPMMs are gaining popularity in direct-drive applications such as electric vehicles, wave energy converters, wind turbines, and traction applications due to their advantages over radial and axial flux machines. They have the advantage of independently controlling the electrical and magnetic loading. Since these are the most crucial factors during machine design, independent control of loadings makes TFM more favorable for electric machine designers. Unlike in radial and axial flux machines, the total winding volume of TFM interacts with its permanent magnets flux to produce torque. To achieve more torque density, it is important to analyze the influence of surface PM and Interior PM on the performance of TFM. Interior PM TFM takes the advantage of both magnetic and reluctance torque which helps in producing more torque with the same size as TFM with surface PMs. Interior PM configuration comes under flux concentrated arrangement in TFMs, which helps in utilizing all the magnet areas at any time. Both configurations will be compared in terms of cogging torque, back EMF, harmonics, flux density distribution, rated torque, power density, and efficiency in this presentation.

Lavanya Vadamodala is currently working as Senior Application Engineer at Altair Engineering, Inc. She earned her Ph.D. in Electrical engineering at The University of Akron, in 2021. Her current interests are Electromagnetics, Electric motor design, Optimization and Multiphysics analysis. She participated in Motor & Drive Systems conference 2021 as co-presenter on Transverse Flux Motors Design.