US Patent 10985624 Rotor with cooling

A rotor for an electric motor has a shaft and a rotor laminated core connected to the shaft. A coolant duct is formed in the rotor in order to enable coolant to flow through the coolant duct. The coolant duct has a first portion, which runs at least in regions in the rotor laminated core. The rotor laminated core has a sleeve on the outer circumferential surface in order to avoid coolant escaping at the outer circumferential surface of the rotor laminated core. In a method for producing a rotor, a material having glass fibers or carbon fibers and a resin are applied to the rotor laminated core, and the resin is subsequently cured in order to produce the sleeve.