Experimental study on electric motor as a sound device

Electric motors are widely used for actuating tasks in systems such as home appliance vacuum cleaners. The main problem with a vacuum cleaner is the large noise from the motor at high-speed rotation. Although research is underway to develop new technology for suppressing motor noise, it is a difficult goal to achieve since motor noise is generated by numerous factors. In this paper, we propose a different solution to the problem. Instead of suppressing the motor noise, we attempt to control the noise spectrum according to the human sound perception. To achieve this, a motor control driver is required for controlling the motor rotational speed and motor noise spectrum independently. To confirm the validity of our proposed concept, we developed a basic prototype of the motor control driver for experimental testing.