As the core feedback unit of the drive motor, the position sensor's failure will directly lead to motor control inaccuracy, abnormal power output, or even system shutdown, posing a serious threat to driving safety. Based on the National Vocational College Skills Competition's New Energy Vehicle Technology event, this paper combines the motor drive control simulation teaching platform. Starting from the installation position and function, structure and working principle, as well as common measurement methods of the motor speed sensor in the 2020 BYD Qin drive system, it provides solutions for students majoring in new energy vehicle technology or practitioners in the automotive maintenance industry.