Electric Machine Connection Structure for Lightweight Torque Transmission

The patent applies curvature by designing the connection structure with arched struts that form a three-dimensional arch framework. The struts are curved rather than straight, creating an arched geometry that naturally redirects forces. This curvature transforms the stress distribution, converting bending and shear stresses into primarily compressive forces along the arch, which are more efficiently carried by the structural members and allow for weight reduction.

The patent transitions from a two-dimensional radial plane connection (disk or spoke structure) to a three-dimensional arched framework. The connection structure extends in the axial direction with struts forming arches that span between the rotor and stator, creating a volumetric load-bearing framework. This dimensional change allows forces to be distributed through three-dimensional load paths rather than confined to a single plane, reducing stress concentrations and enabling weight reduction.

The arched geometry of the struts creates a three-dimensional arch framework that efficiently carries compressive forces. The curved shape of the arches allows for optimal force distribution, directing loads along the arch curves to the support points. This geometric form provides high structural efficiency, achieving reliable torque transmission with minimal material, thereby reducing weight while maintaining stability.

The patent specifies that the connection structure can be made from fiber-reinforced plastics, which are composite materials combining polymer matrices with reinforcing fibers. These composite materials provide high strength-to-weight ratios, enabling the connection structure to withstand high torque loads while maintaining lightweight construction. The anisotropic properties of fiber-reinforced plastics allow optimization of material orientation to match the principal stress directions in the arched framework.