Rotor Frame Rib Structure for Secure Balance Weight Retention

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Solution Overview

Problem

The balance weight on the rotor frame of motors, particularly in drones, tends to come off due to centrifugal forces generated by rotation, leading to imbalance issues.

Innovation Solution

The rotor frame is designed with ribs featuring accommodation holes that securely attach the balance weight, preventing it from dislodging during operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a balance weight is bonded to the rotor frame, then balance adjustment is achieved, but the balance weight comes off due to centrifugal forces during rotation

Engineering Contradiction:

Improvebalance weight retentionVSAvoidcentrifugal force effect

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The rotor frame is segmented into multiple ribs that are radially spaced apart, with each rib containing accommodation holes for balance weights. This segmentation distributes the balance weights across multiple locations, reducing the effect of centrifugal forces on any single weight and preventing them from coming off during rotation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The balance weights are nested within accommodation holes formed in the ribs of the rotor frame. This nested configuration secures the balance weights inside the rotor frame structure, preventing them from being dislodged by centrifugal forces while maintaining balance adjustment capability.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If balance weights are secured in accommodation holes, then balance weight retention is improved, but the rotor frame structure becomes more complex

Engineering Contradiction:

Improvebalance weight retentionVSAvoidrotor frame structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The accommodation holes for balance weights are integrated directly into the ribs of the rotor frame structure. By merging the balance weight retention function with the existing rib structure, the design achieves reliable balance weight retention without adding separate complex retention mechanisms or components.

Inventive Principle:

Principle #5Merging (Combining)

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 design effectively prevents the balance weight from coming off, ensuring stable operation and balance of the rotor frame.

Implementation Method 1

the balance weight undesirably comes off from the rotor frame by centrifugal forces generated by the rotation

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS20250219503A1Motor

Publication Date: 2025.07.03 EXEDY CORP

AI summary

The disclosed motor is configured to prevent a balance weight from coming off from a rotor frame. The motor includes a rotor frame, a rotor, and a stator. The rotor frame includes a plurality of ribs. Each of the plurality of ribs includes one or more accommodation holes. The ribs are disposed away from each other at intervals in a circumferential direction. Each of the ribs each extends in a radial direction. The rotor is supported by the rotor frame. The rotor has an annular shape. The stator is disposed radially inside the rotor.