Insulation technology of motor has been developing rapidly along with the improvement of motor manufacturing technology. Based on our engineering experience in the field of electric vehicle/hybrid electric vehicle (EV/HEV) motor manufacturing, a new type of insulation technology, electrical heating ultraviolet curing (E-UV) impregnation process, is introduced from three aspects: insulation material, equipment, and process. This technology is applicable for random windings motor manufacturing. It is demonstrated through practical application that this technology has several advantages such as low energy consumption, short cycle time and high utilization rate of insulation impregnating vanish, etc. It is very suitable for mass production of EV/HEV motors.