Stator core, motor, compressor, and vehicle
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Solution Overview
Problem
The existing stator core design with oblique surfaces at the joint of adjacent stator yokes results in a reduced radial size, affecting the performance of electric motors by interfering with winding reels and potentially puncturing slot insulation paper, leading to instability and inefficiency.
Innovation Solution
A stator core design with block cores that have a spliced surface facing the axis, featuring a smooth transition along the circumferential direction to increase the radial size of the joint, preventing burrs and ensuring stable insulation and efficient winding, while maintaining low production costs and simple machining technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If oblique surfaces are used at the joint of adjacent stator yokes, then the radial size of the joint is reduced, but this interferes with winding reels and affects motor performance
Solution Approach 1:
The patent applies curvature by designing the joint surface of adjacent stator yokes with an arc-shaped transition instead of a sharp angle. The arc radius R is specifically designed to be between 0.5-2mm, creating a smooth curved surface that eliminates burrs while maintaining adequate radial clearance for winding reels, thus resolving the contradiction between reduced radial size and winding reliability
2Volume of moving object
If oblique surfaces are used at the joint of adjacent stator yokes, then the radial size of the joint is reduced, but burrs are generated that may puncture slot insulation paper
Solution Approach 1:
The arc-shaped joint surface with radius R=0.5-2mm eliminates sharp angles that generate burrs during machining. The curved transition smoothly connects adjacent stator yokes, preventing burr formation that could puncture slot insulation paper, thus resolving the contradiction between compact radial size and prevention of harmful burrs
Solution Approach 2:
The patent designs the arc radius R to be within a specific range (0.5-2mm) that provides a buffer zone at the joint. This pre-designed geometric cushioning prevents the formation of sharp edges and burrs before machining occurs, protecting the slot insulation paper from potential damage
3Volume of moving object
If oblique surfaces are used at the joint of adjacent stator yokes, then the radial size is reduced, but the machining technology becomes more complex
Solution Approach 1:
The arc-shaped joint surface can be efficiently machined using standard CNC milling operations with a ball-end mill. The arc radius R=0.5-2mm is within the optimal range for conventional machining tools, allowing the curved surface to be generated in a single machining operation without requiring complex multi-step processes, thus maintaining ease of manufacture while achieving the desired geometric form
Data Source
AI summary
A stator core, an electric motor, a compressor and a vehicle are provided. The stator core has multiple block cores. The block cores are sequentially connected end to end around an axis of the stator core. Each block core has multiple stacked laminations. Each block core has a stator yoke and a stator tooth, which are connected to each other. The stator tooth is located between the stator yoke and the axis of the stator core. The stator yokes and the stator teeth of any two adjacent block cores define a stator slot. A wall surface, facing the axis of the stator core, of the stator yoke is a spliced surface. In a circumferential direction of the stator core, at least part of a joint of any two adjacent spliced surfaces is in smooth transition.