Abstract
This study focused on the efficiency improvement and acoustic noise reduction of brushless DC (BLDC) motors by reducing current harmonics using a novel BLDC commutation method. To achieve these goals, we designed an improved 150° commutation method for a three-phase permanent magnet BLDC motor that can improve the current waveform. Although the 120° commutation method is generally employed for BLDC motors, an improved 150° commutation method is introduced to operate the BLDC with increased efficiency and acoustic noise similar to a brushless AC motor. This study investigated the attributes of various commutation methods, both theoretically and experimentally, to determine the optimal commutation method. The results of this study indicate that the improved 150° commutation method is optimal in terms of harmonic attributes and reduced torque ripple, allowing it to improve motor efficiency and reduce acoustic noise.
Highlights
Many power plants that generate electricity use fossil fuels
We propose a method for improving efficiency and reducing acoustic noise and vibration by generating a back electromotive force and sinusoidal current waveform using a conventional brushless DC (BLDC) controller
This study focused on the reduction of electromagnetic acoustic noise caused by current harmonics, which is the main cause of acoustic noise in BLDC motors, by developing a new commutation method
Summary
Many power plants that generate electricity use fossil fuels. the threats of global warming and resource depletion are increasing as a result of the use of fossil fuels.To mitigate these issues, electricity is being produced using new energy sources such as renewable energy, but these sources have limitations. Many power plants that generate electricity use fossil fuels. The threats of global warming and resource depletion are increasing as a result of the use of fossil fuels. To mitigate these issues, electricity is being produced using new energy sources such as renewable energy, but these sources have limitations. The efficiency standards for industrial applications have been strengthened and industrial motors may need to meet the IE4 or IE5 efficiency classes [1]. The electrical energy consumption of motors accounts for 35% to 40% of the electrical energy generated worldwide [1,2,3]
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