Sound Quality of Small DC Motor

Many industrial and consumer applications require movement between their components to achieve the desired functionality. In most cases, movement is obtained through the use of gearmotors, which allows to adapt speed and torque to the requirements established during the design process. As a general rule, gearmotors comprise a motor, which acts as the main energy source; and a kinematic chain, which is responsible for transmitting the movement towards the output shaft by modifying the input torque. The motor is one of the most important noise sources in gearmotors and, therefore, its selection largely determines the acoustic behaviour. Throughout this work, it is carried out the study of the sound quality of small electric motors with the aim of establishing a metric that facilitates, during the design process, the selection of the most suitable motor for its implementation in small electromechanical devices. For this purpose, a semantic differential method is adopted to evaluate user's perception according to different attributes, such as annoyance, power, robustness, functioning, loudness, price and quality.