Direct-Drive Electric Motor for Rotary Wing Aircraft
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Solution Overview
Problem
Conventional rotary-wing aircraft rely on mechanical drive trains and hydraulic systems, which increase weight, maintenance, and operational costs due to the complexity of gearboxes and rotating shafts.
Innovation Solution
An electric propulsion system is introduced, featuring a static mast with a rotatable yoke and fairing assembly, utilizing a direct drive electric motor with a stator and rotor assembly, and a bearing system that allows the yoke to articulate, eliminating the need for traditional gearboxes and hydraulic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a mechanical drive train with gearboxes and rotating shafts is used, then power transmission from engine to rotor is achieved, but aircraft weight increases and maintenance requirements increase
Solution Approach 1:
The patent extracts and eliminates the mechanical gearbox and intermediate shaft from the drive train, replacing them with a direct-drive electric motor system. The electric motor is mounted directly to the rotor hub, removing the need for complex mechanical power transmission components and significantly reducing weight.
Solution Approach 2:
The patent replaces the mechanical drive train system with an electric propulsion system. Electric motors mounted on the rotor hub directly drive the rotor blades through electromagnetic fields, substituting mechanical gearboxes and shafts with electrical power transmission, thereby eliminating mechanical complexity and weight.
2Power
If a mechanical drive train with gearboxes and rotating shafts is used, then power transmission from engine to rotor is achieved, but maintenance requirements increase
Solution Approach 1:
The patent removes the gearbox and intermediate shaft components from the system, eliminating the mechanical elements that require maintenance. The direct-drive electric motor system has fewer moving parts and no mechanical transmission components to wear or fail.
Solution Approach 2:
By replacing the mechanical drive train with an electric motor system directly mounted to the rotor hub, the patent eliminates complex mechanical transmissions that require regular maintenance, lubrication, and repair, thereby improving ease of repair and reducing maintenance requirements.
3Power
If a mechanical drive train with gearboxes and rotating shafts is used, then power transmission from engine to rotor is achieved, but operational costs increase
Solution Approach 1:
The patent extracts and eliminates the mechanical gearbox and intermediate shaft, removing components that contribute to operational costs through maintenance, repairs, and downtime. The simplified electric drive system reduces ongoing operational expenses.
Solution Approach 2:
By substituting the mechanical drive train with an electric motor system, the patent eliminates the operational costs associated with mechanical maintenance, lubrication, and repair of gearboxes and shafts, thereby reducing overall operational costs.
4Power
If traditional mechanical systems are used, then power transmission is achieved, but system complexity increases
Solution Approach 1:
The patent removes the gearbox, intermediate shaft, and associated mechanical components from the system, dramatically simplifying the overall structure. The direct-drive electric motor system eliminates multiple mechanical stages and reduces system complexity.
Solution Approach 2:
By replacing the complex mechanical drive train with a compact electric motor system directly mounted to the rotor hub, the patent eliminates mechanical gearboxes, shafts, and couplings, thereby reducing system complexity and improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces aircraft weight, maintenance, and operational costs by simplifying the propulsion system, enhancing aerodynamics, and providing a more efficient and reliable power transmission.
Implementation Method 1
An electric motor is housed within the fairing assembly. The electric motor includes a stator assembly coupled to the mast and a rotor assembly configured to rotate with respect to the stator assembly.
Implementation Method 2
a bearing system disposed between the at least one yoke and the mast, wherein the bearing system allows the at least one yoke to articulate relative to the mast
Data Source
AI summary
An electric propulsion system includes a mast defining an axis of rotation. At least one yoke is rotatably mounted to the mast. A fairing assembly surrounds the at least one yoke. An electric motor includes a stator assembly associated with the fairing assembly and a rotor assembly associated with the yoke.