Hydraulic Propulsion System for Multirotor VTOL Aircraft

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2018-IVAN-68075
Current multi-rotor VTOL aircraft utilize electric propulsion systems to distribute power to the aerodynamic rotors (propeller in most cases) and to control the rotor speed. The current electric propulsion systems rely on electric motors that are heavy and expensive. There is a need for weight reduction of the propulsion system in multi-rotor VTOL aircraft.

Researchers at Purdue University have developed an inexpensive, recyclable hydraulic propulsion system for multi-rotor VTOL aircrafts. The propulsion system utilizes hydrostatic transmission, a lighter weight and more reliable option, to distribute prime mover (engine or electric motor) power to the rotors, providing thrust for the aircraft and allowing rapid control of the speeds of the rotors. This provides both aerodynamic lift and attitude control, eliminating the need for an additional moving control surface or weight shifting device and resulting in a more stable flight and more useful load. For the same torque, an off-the-shelf hydraulic motor can be 4 times lighter than the state-of-the-art electric motor (permanent magnetic axial flux).

Advantages:
-Light-weight/inexpensive
-Recyclable
-Stable flight
-Reliable

Potential Applications:
-VTOL aircraft
Apr 10, 2020
NATL-Patent
United States
(None)
(None)

Oct 8, 2018
PCT-Patent
WO
(None)
(None)

Oct 11, 2017
Provisional-Patent
United States
(None)
(None)
Purdue Office of Technology Commercialization
The Convergence Center
101 Foundry Drive, Suite 2500
West Lafayette, IN 47906

Phone: (765) 588-3475
Fax: (765) 463-3486
Email: otcip@prf.org