Abstract
Achieving high efficiency and high torque is an important target in EV motors. This paper describes the effect of the magnetic properties of electrical steels used as core materials for synchronous motors with permanent magnets, which are commonly used as the EV traction motors. It was confirmed that electrical steels, which have high flux density and low iron loss properties can realize high motor efficiency and torque. When PWM excitation is considered, thinner electrical steels are advantageous to suppress increased loss due to higher harmonics. Based on these results, electrical steels having high flux densities and low iron losses at high frequencies were developed.
Highlights
Improvement of motor efficiency is an important issue for increasing the electric power efficiency of electric vehicles (EV)
In the case of EV, since traction motors are driven under a wide range of conditions [3], high efficiency or high torque is required in each driving condition
This fact indicates that 90 in the flux waveforms is material significant in BLDC motors, and the iron loss measured under high frequency conditions is important for core material evaluation
Summary
Improvement of motor efficiency is an important issue for increasing the electric power efficiency of electric vehicles (EV). In the case of EV, since traction motors are driven under a wide range of conditions [3], high efficiency or high torque is required in each driving condition Under these circumstances, low iron loss and high flux density (high permeability) are demanded in electrical steels. The effects of the magnetic properties of electrical steels on motor loss and torque are discussed based on the measured results obtained with BLDC motors. To understand the origin of the higher harmonic iron loss component in inverter-driven motors, which are commonly used in EVs, inverter-fed magnetic measurements were carried out, and the influence of the material thickness on core loss under PWM excitation conditions was evaluated. Electrical steels suitable for EV motors are described based on the evaluation considering motor operation conditions
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