Multicopter Rotor Torque Coupling for Actuator-Free Blade Angle Control
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Solution Overview
Problem
Existing multicopters face challenges in achieving quiet operation, dynamic control, ease of production, and high efficiency, particularly due to the reliance on active actuators for rotor blade angle adjustment.
Innovation Solution
A multicopter design featuring a mechanical automatic system that couples drive torque to rotor blade angle of attack without active actuators, utilizing a mechanical coupling between rotor device portions to adjust the blade angle based on torque, incorporating elastic couplings and stops to stabilize rotational speed and thrust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If active actuators are used to adjust rotor blade angle, then dynamic control is achieved, but device complexity and cost increase
Solution Approach 1:
The rotor blade angle adjustment system operates automatically based on drive torque changes without requiring external actuators. The mechanical coupling between the drive shaft and rotor blades enables the system to self-regulate blade angle according to operational conditions, eliminating the need for complex active control components.
Solution Approach 2:
The patent replaces electronic/actuator-based control systems with a purely mechanical automatic adjustment mechanism. The mechanical coupling and elastic elements work together to translate drive torque changes directly into blade angle adjustments, substituting complex electronic control with simpler mechanical principles.
2Object-affected harmful factors
If rotor diameter is increased to reduce rotational speed and noise, then noise emissions decrease, but power requirements increase
Solution Approach 1:
The system dynamically adjusts rotor blade angle based on drive torque changes, allowing the rotor to operate efficiently across different power levels. This dynamic adaptation enables larger rotor diameters to maintain optimal performance without requiring proportional increases in power, as the blade angle automatically optimizes thrust generation at each operating condition.
3Adaptability or versatility
If elastic coupling is used to enable relative twisting, then blade angle adjustment is achieved, but structural complexity increases
Solution Approach 1:
The patent changes the physical state of the coupling element from rigid to elastic, enabling relative twisting between the drive shaft and rotor blades. This parameter change allows the structure to adapt to torque variations automatically, achieving blade angle adjustment through material elasticity rather than complex mechanical linkages.
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 design reduces noise emissions, enhances flight time with reduced power requirements, and improves efficiency by allowing larger rotor diameters with lower rotational speeds, while maintaining reliable operation.
Implementation Method 1
a elastic coupling device (44) that elastically couples the second portion (26) to the first portion (24)
Implementation Method 2
a mechanical coupling (34) that couples the relative position of the first portion (24) relative to the second portion (26) to a rotational position of the rotor blade (20) about the rotor blade axis (22)
Data Source
AI summary
A multicopter is disclosed including a plurality of rotor devices, where a rotor device has at least one rotor blade which is rotatable about a rotor blade axis. The rotor device further includes a first section rotatably driven about an axis of rotation and a second section which is movable relative to the first section about an axis running parallel to the axis of rotation and to which the rotor blade is attached or which includes the rotor blade. A relative position of the second section in relation to the first section depends on a torque with which the first section is driven and a mechanical coupling which couples the relative position of the first section relative to the second section to a rotational position of the rotor blade about the rotor blade axis.