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Column: Motor Design using SMC Materials
Investigation of SMC Somaloy 700 7P for High-Performance Axial Flux Motor Applications
Contributed by Alvier Mechatronics AB
The relentless push for higher power density and efficiency in electric vehicle traction has driven the rapid adoption of axial flux permanent magnet motors. Soft Magnetic Composites (SMCs) are uniquely suited for these topologies due to their isotropic magnetic properties and ability to realize complex three-dimensional flux paths. This paper presents an investigation into the new-generation SMC material: Somaloy 700 7P. A comprehensive finite element analysis is conducted on a 150 kW dual-rotor, single-stator axial flux motor to benchmark the new 7P material against its predecessors, Somaloy 700HR 3P and Somaloy 700HR 5P. While low-speed torque characteristics remain identical due to equivalent magnetic saturation limits, the advanced coating and annealing process of the 7P grade drastically reduces high-frequency eddy current losses. The results demonstrate that the motor equipped with the 7P material achieves superior high-speed efficiency, and an elevated active power density, cementing its role as a key enabler for next-generation high-performance e-mobility applications.
Contents:
Abstract
Index Terms
- INTRODUCTION
- SMC MATERIAL BACKGROUND
A. Material Evolution
B. Material Comparison - MOTOR DESIGN AND MODELING SETUP
A. Motor Topology
B. FEA Methodology and Control Strategy - ELECTROMAGNETIC PERFORMANCE COMPARISON
A. Back EMF (No Load)
B. Efficiency Map
C. Summary - CONCLUSION
REFERENCES
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