Development of Systematic Technique for Design of Electric Motor Mounting System in EV/ HEV Application

Last decade has been era of environmental awareness. Various programs have launched for making devices and appliances eco-friendly. This initiative has lead automobile industry toward hybridization and now total electrification of vehicles. As electric motor is being added to automobile as a prime mover, due to high frequency vibrations along with higher torque electric motor needs to be isolated properly & carefully as this vibration can damage other automobile parts. Dynamic response of electric motor is different from response of IC engines, so use of engine mounting design method may not be suitable for designing mounting system for electric motor. First, both 4- point and 3- point mounting system are considered for analytical and experimental investigation of force and displacement transmissibility. Position and orientation of elastomeric mounts plays important role in design of mounting system for electric motor. Mounts used in passive vibration isolation are made up of elastomeric material, which are resilient in nature. So if force is applied on mount it will deflect in direction of force therefore ideal positions for elastomeric mounts are found by drawing free body diagrams (FBD) of force distribution on mount due to electric motor at various position in a single plane. Response of these two configurations are then compared. This paper focuses on delivering systematic approach for finding optimal positions, orientation & number of elastomeric anti-vibration mounts to achieve proper vibration isolation and decoupling of vibration modes.