This paper presents the development of a motor that was supposed to be adopted in the Kinetic Energy Recovery System for the Formula One world championship 2009 series. KERS can recover and utilize braking energy in the form of power assist, with maximum energy use per lap of 400 kJ and maximum power of 60 kW. This hybrid system is expected to provide benefits such as lap time reduction and straightaway speed gain for overtaking. The motor is required to achieve downsizing, light weight, high power density, wide power band, and high efficiency. This paper describes how the on-board layout, size, and specifications were decided and how the newly developed technologies were applied and test result to confirm enhanced performance.