Nested Rotor Driving Device for UAV Miniaturization

Solution Overview

Problem

Current electric motor-driven devices for unmanned movable platforms, such as UAVs, are complex and occupy large space, making it difficult to miniaturize the devices.

Innovation Solution

A driving device comprising two rotor assemblies with a nested configuration and a single stator assembly, where one rotor assembly drives the other to rotate, reducing the overall size and complexity by eliminating the need for two independent stator assemblies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If two independent stator assemblies and two rotor assemblies are used to drive multiple functions, then the driving capability and functional versatility are improved, but the device complexity and occupied space increase

Engineering Contradiction:

Improvefunctional versatilityVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines two independent stator assemblies into a single shared stator assembly that surrounds both rotor assemblies. This merging reduces the number of components and simplifies the overall structure while maintaining the capability to drive multiple functions through the two rotor assemblies.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs a nested configuration where one rotor assembly is positioned inside the other, and both are surrounded by a single stator assembly. This nesting arrangement maximizes space utilization and reduces the overall device footprint while preserving the functional capabilities of multiple rotors.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If two independent stator assemblies and two rotor assemblies are used to drive multiple functions, then the driving capability and functional versatility are improved, but the occupied space increases

Engineering Contradiction:

Improvefunctional versatilityVSAvoiddevice volume

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The patent combines two independent stator assemblies into a single shared stator assembly that surrounds both rotor assemblies. This merging reduces the number of components and simplifies the overall structure while maintaining the capability to drive multiple functions through the two rotor assemblies.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs a nested configuration where one rotor assembly is positioned inside the other, and both are surrounded by a single stator assembly. This nesting arrangement maximizes space utilization and reduces the overall device footprint while preserving the functional capabilities of multiple rotors.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

The solution simplifies the structure and reduces the size of the driving device, enabling miniaturization while maintaining effective rotation and load handling capabilities.

Implementation Method 1

One of the stator and the rotor may be a powered coil, the other one may be a magnetic element. When the coil is powered, the stator and the rotor may generate relative rotation under the function of the electromagnetic field

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

The rotor driven by the stator assembly is configured to cause a rotor of the other one of the first rotor assembly and the second rotor assembly to rotate

Methodology Applied

Scientific EffectMechanical force transmission: Mechanical Force

Data Source

PatentUS11469655B2Driving device, laser measurement device and movable platform

Publication Date: 2022.10.11 SZ DJI TECH CO LTD

AI summary

A driving device includes two rotor assemblies, a stator assembly, and a positioning assembly. Each rotor assembly includes a rotation axis and a rotor. The rotor includes a hollow chamber. The two rotor assemblies include a first rotor assembly and a second rotor assembly, a rotation axis of the first rotor assembly is parallel with a rotation axis of the second rotor assembly, a rotor of the first rotor assembly is at least partially embedded in a chamber of a rotor of the second rotor assembly. The stator assembly is surroundingly disposed at an outer side of the two rotor assemblies and drives a rotor. The rotor driven by the stator assembly causes another rotor of one of the first rotor assembly and the second rotor assembly to rotate. The positioning assembly is located outside of the rotors, and limits the rotors to rotate around corresponding fixed rotation axes.