Magnetic Characteristics of FeSiB Cores in Motors Revealed by Experiment and Finite-Element Simulation

TL;DR

This paper studies how FeSiB amorphous alloys affect motor efficiency through experiments and simulations, showing reduced energy loss at specific temperatures.

Contribution

The study reveals the optimal annealing conditions for FeSiB cores to minimize energy loss in motors, supported by finite-element simulations.

Findings

FeSiB core loss decreased significantly during heating but increased at higher temperatures.

Annealing at 460 °C for 10 min minimized core loss to 0.11 W/kg and 5.45 W/kg at different frequencies.

Finite-element analysis showed FeSiB cores reduce motor losses and improve electromagnetic performance.

Abstract

Iron core loss (Pcm) is the main source of energy dissipation in motors, primarily affected by the stator material, which necessitates the optimization of soft-magnetic materials. In this work, the magnetic characteristics of FeSiB amorphous alloys and their influence on motors were systematically investigated via both experiment and finite-element simulation. It was found that the Pcm of the FeSiB core initially decreased significantly during heating but subsequently increased with a further temperature rise. In particular, after annealing at 460 °C for 10 min, the FeSiB core exhibited the lowest Pcm of 0.11 W/kg (50 Hz, 1 T) and 5.45 W/kg (1 kHz, 1 T), which correlated well with the changes in the magnetization. With the help of the finite-element analysis, the low Pcm of the motor using the FeSiB core was further demonstrated, and was closely associated with the dominance of the stator loss. Additionally, the magnetic flux density cloud and the related electromagnetic torque of the motor were comparatively analyzed to unveil the potential advantages of the current FeSiB core. This work provides an important theoretical basis for the design and development of amorphous/nanocrystalline motors.

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