The invention is a combined motor that combines or integrates electric and hydraulic power producing technologies into a single compact motor by means of common or shared rotor and stator elements. The invention allows optimized power, torque, performance and energy usage in electric and electric-hybrid vehicles and offers reduced weight and lower production costs due the use of common or shared components. The combined motor's electric and hydraulic power producing elements are preferably coaxial and coplanar, permitting axial compactness and enabling efficient space utilization in the vehicle. In typical electric vehicle drive cycles disproportionately large energy losses occur during the launch acceleration and brake energy recovery modes of vehicle torque demand. The combined motor increases overall efficiency by substituting high-efficiency hydraulic torque for low-efficiency electric torque during these modes. These peak efficiency substitutions conserve battery energy during launch acceleration, maximizing the state of charge to extend driving range or runtime.
Combined electric and hydraulic motor
2019-04-23
Patent
Electronic Resource
English
IPC: | F01B Kraft- und Arbeitsmaschinen oder Kraftmaschinen allgemein oder mit Verdrängerwirkung, z.B. Dampfkraftmaschinen , MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / E02F Baggern , DREDGING / F03C Verdrängerkraftmaschinen mit Flüssigkeitsantrieb , POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS / F04B Verdrängerkraft- und Verdrängerarbeitsmaschinen für Flüssigkeiten , POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS / H02K Dynamoelektrische Maschinen , DYNAMO-ELECTRIC MACHINES |
Energy recovery system based on multi-hydraulic motor-accumulator combined electric forklift
European Patent Office | 2021
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