Analytical loss model for single- and two-speed electric vehicle gearboxes

This paper investigates load-dependent and load-independent power losses of clutchless dual-stage single- and two-speed gearboxes for a subcompact electric vehicle (EV). The load-dependent loss includes gear meshing and bearing friction losses, whereas the load-independent loss encompasses gear churning, bearing drag and oil lip seal sources of loss. The methodology proposed estimates these losses based on the geometric parameters and dynamic …