Brushless bldc motors are often used in fan applications due to their easy speed controllability, high efficiency and long life time. These motors have a higher efficiency than induction motors do, therefore their operating temperature remains lower than that of induction motors. That is especially true for the comparison between bldc and single phase induction motors such as shaded-pole or permanent-split capacitor motors. A lower operating temperature also means a lower bearing temperature. Due to this lower bearing temperature, the bldc motor has a significantly higher life time expectancy. A further important feature of this motor is its easy speed controllability. This is very advantageous because by controlling the fan speed, power consumption and acoustic noise can easily be reduced. The commutation process affects torque characteristics, efficiency and mechanical vibration of these motors. The state-of-the-art commutation circuits are usually controlled by a microcontroller. Since the capability even of low cost microcontrollers increases continuously, new concepts for improved fan motors will be able to be utilized also for mass production in the foreseeable future. This paper discusses how fan motors with improved efficiency and reduced acoustic noise can be developed.
Optimization of the commutation process at brushless DC fan motors
2005
6 Seiten, 8 Bilder, 6 Quellen
Conference paper
English
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