NEW SOLUTIONS FOR MAKING ELECTRIC MACHINES WITH HIGH SPECIFIC POWERS FOR PROPULSION SYSTEMS OF ELECTRIC AND HYBRID VEHICLES

Abstract

Within the propulsion systems of electric or hybrid vehicles, road, naval or air, electric cars represent some of the main components that determine the weight of these systems. As a result, the realization of light electric propulsion systems requires the use of electric machines with high specific powers. In this work, we will present the results published in recent years in the specialized literature regarding the realization of electric car cooling systems in order to obtain high specific powers. New technologies for dissipating the heat generated by the energy losses in these machines will be presented, technologies that combine both passive cooling structures and active cooling structures, such as those using heat pumps. Also, research results will be presented regarding the realization of some components of these cooling structures using additive manufacturing technology, made with 3D printing systems, a technology that has evolved rapidly in recent years offering a new way to easily create, from various conductive, insulating or magnetic materials of parts with complex geometry, such as electric machine windings with direct incorporation of ceramic insulation, magnetic circuits with permanent magnets or thermal heat exchanger circuits.