Stator Frame Notch and Reinforcing Member for Rotating Electrical Machine
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Solution Overview
Problem
The existing rotating electrical machines face issues with deformation and reduced rigidity of the stator iron core due to press-fitting, which worsens the roundness and requires notches in the frame, leading to decreased rigidity and potential damage from vibrations.
Innovation Solution
A rotating electrical machine design featuring a stator with a rotor, a stator iron core with multiple slots, an annular frame holding the outer periphery, and a reinforcing member straddling notches in the frame to enhance rigidity while restricting deformation, using a combination of press-fitting, welding, and a reinforcing member to secure the stator iron core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the frame is press-fitted onto the stator iron core, then the stator iron core is securely held, but deformation occurs in the stator iron core and roundness worsens
Solution Approach 1:
The frame is designed with a notch portion that creates local rigidity variations. The notch is positioned to allow controlled deformation in specific areas while maintaining overall structural integrity, enabling the frame to accommodate stator iron core deformation without compromising the secure holding relationship between the frame and stator iron core.
2Manufacturing precision
If a notch is formed in the frame to restrict stator iron core deformation, then deformation is reduced, but rigidity of the frame decreases
Solution Approach 1:
The frame incorporates a notch portion with specific geometric characteristics (depth, width, and position) that create localized flexibility. This notch is designed to concentrate deformation in a controlled manner, allowing the frame to maintain sufficient overall rigidity while providing the necessary compliance to restrict stator iron core deformation.
Solution Approach 2:
The frame structure is segmented by the notch portion, which divides the continuous frame into regions with different rigidity characteristics. This segmentation allows the frame to function as both a rigid support structure and a deformation-control mechanism, balancing the conflicting requirements of rigidity and deformation restriction.
3Manufacturing precision
If the frame rigidity is lowered to accommodate deformation, then stator iron core deformation is restricted, but vibration resistance decreases
Solution Approach 1:
The notch portion is strategically positioned and dimensioned to create localized flexibility that absorbs deformation while the overall frame maintains sufficient rigidity for vibration resistance. The notch acts as a stress relief feature that prevents crack propagation and maintains structural reliability under vibrational loads.
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 lowers the frame's rigidity and restricts stator iron core deformation, improving the machine's structural integrity and vibration resistance, while allowing for efficient signal line placement and enhanced sensor accuracy.
Implementation Method 1
a frame on which a flange portion is provided is press-fitted onto a stator iron core
Data Source
AI summary
The rotating electrical machine includes a rotor held so as to be able to rotate, and a stator that opposes the rotor and has a stator iron core in which a multiple of slots are formed. The stator includes a coil wound around a toothed portion that forms the multiple of slots and an annular frame that holds an outer periphery of the stator iron core, a trunk portion and a flange portion are formed in the frame, a notch portion is provided in the trunk portion and the flange portion, the stator iron core is held by the trunk portion, and a reinforcing member that straddles the notch portion is provided on the flange portion.