Motor Frame Convex-Concave Segmentation for Rotor Concentricity
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Solution Overview
Problem
Existing motor designs face challenges in achieving concentricity between the rotor and stator due to assembly and processing accuracy issues, leading to vibration and potential malfunction.
Innovation Solution
A motor design featuring a frame with a first and second frame part, where the first frame part includes a support part for a preload member and a convex surface, and the second frame part has a concave surface to combine with the convex part, ensuring the preload member is supported and maintaining concentricity by applying a preload in the axis line direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the frame is divided into multiple frame parts for manufacturing, then the ease of manufacture is improved, but the manufacturing precision of the support part connection deteriorates
Solution Approach 1:
The frame is divided into a first frame part and a second frame part along the axis line direction, allowing independent manufacturing and assembly while maintaining overall structural integrity through the convex-concave connection mechanism
Solution Approach 2:
The convex part and concave part serve as intermediary connection elements between the first and second frame parts. The convex part protruding from the first frame part fits into the concave part of the second frame part, providing a precise positioning interface that ensures accurate alignment and connection of the divided frame parts
2Ease of manufacture
If the support part is divided into multiple parts, then the ease of manufacture is improved, but the concentricity of the rotor with respect to the stator deteriorates
Solution Approach 1:
The support part is divided between the first frame part (containing the convex part) and the second frame part (containing the concave part), enabling separate manufacturing while maintaining precise relative positioning through the convex-concave interface
Solution Approach 2:
The convex-concave connection acts as an intermediary mechanism that ensures accurate positioning and alignment between the divided support parts, thereby maintaining the concentricity of the rotor with respect to the stator despite the division of the support structure
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 improves the concentricity of the rotor with respect to the stator, reduces vibration, and prevents bearing malfunction by maintaining the preload direction parallel to the axis line, thereby enhancing motor performance and reducing noise.
Implementation Method 1
a preload member generating a preload in a direction of an axis line of the rotor
Data Source
AI summary
A motor includes a frame including a first bearing holder, a stator, a first bearing held in the first bearing holder, a rotor rotatably supported by the first bearing, and a preload member generating a preload in a direction of an axis line of the rotor. The frame further includes a first frame part. The first frame part includes a support part supporting the preload member. An outer end part of the preload member faces the support part so as to be covered with the support part.