Presentation of Hitting Sensation to the Racket by a Single DC motor Embedded in a Handle

This paper proposes a method of integrating a DC motor into a handle to provide the sensation of impact in racket sports. The tactile sensation from the vibration of a DC motor has a wide frequency bandwidth, and the cylindrical shape of the DC motor is suitable to be embedded in the handle. On the other hand, due to the nature of the tactile presentation by rotational torque, there is a possibility that the direction of motor rotation may be perceived. We considered that by rotating the motor in one direction for a short period and then in the opposite direction, the rotational direction would be indistinguishable. In this research, as a fundamental study in the presentation of the sensation of hitting using a motor, we clarify the conditions under which the torque direction is not perceived.