Claw-Pole Motor Stator Core Segmentation
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Solution Overview
Problem
Increasing the number of pole teeth in a claw-pole motor stator core leads to excessive stress during bending processing, potentially causing distortion in the annular portion.
Innovation Solution
The stator core is designed with alternating lower and upper annular portions and pole teeth, allowing for a higher number of pole teeth without increasing stress on the annular portion by overlapping and positioning these components to distribute stress evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of pole teeth is increased to improve motor characteristics, then motor performance is improved, but stress on the annular portion during bending processing increases causing distortion
Solution Approach 1:
The stator core is divided into multiple independent stator core units, each containing a limited number of pole teeth formed by bending processing. This segmentation allows each unit to be manufactured separately with controlled stress, then assembled together to form the complete stator core with the desired high number of pole teeth, thereby avoiding distortion while achieving improved motor characteristics
Solution Approach 2:
Multiple stator core units are stacked and assembled together in a nested configuration to form the complete stator core. Each unit contains pole teeth that are alternately arranged with pole teeth from adjacent units, creating the appearance of a high number of pole teeth without requiring all of them to be formed in a single bending operation, thus preventing annular portion distortion
Data Source
AI summary
A stator includes a first sleeve extending in an axial direction and a first stator core on an outer periphery of the first sleeve. The first stator core includes a lower core and an upper core on a side of the lower core opposed to a first end of the axial direction. The lower core includes a lower annular portion with an annular shape and lower pole teeth protruding radially outward from a radially outer end surface of the lower annular portion and extending to a second end of the axial direction. The upper core includes an upper annular portion with an annular shape arranged on the lower annular portion opposed to the first end of the axial direction to overlap the lower annular portion, and upper pole teeth protruding radially outward from a radially outer end surface of the upper annular portion and extending to the second end of the axial direction. Each of the lower pole teeth and each of the upper pole teeth are alternately arranged in the circumferential direction.