Drone Motor Rotor Groove Design for Weight Reduction
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Solution Overview
Problem
Drones face challenges in reducing weight while maintaining motor performance, as existing motor designs are inefficient and heavy, particularly due to the weight of the rotor and magnets.
Innovation Solution
The motor design incorporates a rotor with a cover portion and body portion that includes groove or protrusion portions on its inner surface, allowing for reduced magnet size and weight, with the magnets being attached directly to these features, eliminating the need for additional alignment tools and enhancing magnetic flux saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional motor design is used, then motor performance is maintained, but drone weight increases
Solution Approach 1:
The rotor body includes groove portions that create local variations in thickness, with thinner regions between magnets and thicker regions at magnet positions. This local quality differentiation reduces overall rotor weight while maintaining magnetic flux saturation at critical locations, thereby resolving the contradiction between weight reduction and motor performance maintenance.
Solution Approach 2:
The rotor body is segmented into multiple functional zones through groove portions, creating distinct regions for magnet attachment and magnetic flux path. This segmentation allows optimized material distribution, reducing weight in non-critical areas while preserving performance in critical magnetic zones.
2Weight of moving object
If magnet size is reduced to decrease weight, then drone weight decreases, but motor performance deteriorates
Solution Approach 1:
The groove portions create local quality variations in the rotor body, concentrating material where magnetic flux saturation is needed (at magnet positions) while removing material where it is less critical (between magnets). This allows smaller magnets to achieve the same performance by utilizing the optimized magnetic path provided by the groove portions.
Solution Approach 2:
The invention changes the geometric parameters of the rotor body by introducing groove portions with specific depth and width ratios. This parameter modification optimizes the magnetic flux path length and distribution, enabling reduced magnet size while maintaining the magnetic field strength necessary for motor performance.
3Manufacturing precision
If additional alignment tools are used for magnet attachment, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The groove portions are integrally formed with the rotor body, creating self-aligning features that guide magnet placement during assembly. The groove geometry itself provides the alignment function, eliminating the need for separate alignment tools or complex positioning mechanisms, thereby reducing device complexity while maintaining manufacturing precision.
Solution Approach 2:
The alignment function is merged with the structural groove portions of the rotor body. The same features that define the magnetic flux path also serve as alignment guides for magnet attachment, combining multiple functions into a single structural element and reducing overall system complexity.
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 effectively reduces the drone's weight and improves motor performance by optimizing the magnetic flux area and eliminating the need for additional alignment tools, resulting in a more efficient and lightweight motor system.
Implementation Method 1
A rotor of the motor rotates due to an electrical interaction between a stator and the rotor such that the motor drives the propeller
Implementation Method 2
a plurality of magnets which are arranged on an inner circumferential surface of the body portion
Data Source
AI summary
The present invention provides a motor for a drone, comprising: a rotary shaft; a stator including a hole in which a rotary shaft is arranged; and a rotor arranged on the outer side of the stator, wherein the rotor comprises: a cover part coupled with the rotary shaft and covering the upper part of the stator; a body part covering a side portion of the stator; and a plurality of magnets arranged on an inner circumferential surface of the body part so as to be spaced from each other, wherein the body part includes a plurality of groove portions arranged so as to be spaced from each other, thereby providing an advantageous effect of reducing the weight of a drone by reducing the weight of the rotor.