Abstract: A strain-matched hub for a motor/generator. The motor/generator preferably includes a cylindrical rotor surrounding a stator, and of larger diameter than a shaft. The hub, formed of a single material, connects the shaft to the rotor assembly, and contains a fastener circle whose expansion is matched to the rotor's expansion, in operation. Like the rotor, the hub's fastener circle expands uniformly around the fastener circle's circumference.

Abstract: A strain-matched hub for a motor/generator. The motor/generator preferably includes a cylindrical rotor surrounding a stator, and of larger diameter than a shaft. The hub, formed of a single material, connects the shaft to the rotor assembly, and contains a fastener circle whose expansion is matched to the rotor's expansion, in operation. Like the rotor, the hub's fastener circle expands uniformly around the fastener circle's circumference.

Abstract: A strain-matched hub for a motor/generator. The motor/generator preferably includes a cylindrical rotor surrounding a stator, and of larger diameter than a shaft. The hub, formed of a single material, connects the shaft to the rotor assembly, and contains a fastener circle whose expansion is matched to the rotor's expansion, in operation. Like the rotor, the hub's fastener circle expands uniformly around the fastener circle's circumference. Typically, a ring of keystone-shaped metal elements fits the hub to the rotor. The hub attaches to the keystone-shaped elements with a plurality of bolts or other fasteners, and the keystone-shaped elements fit to the rotor. The hub is formed of a single material and contains a plurality of spokes, each spoke positioned along a radius from the center of the hub to the center of a bolt. Each spoke is shaped to fit between two pairs of tangent-joined circles.