Stator, motor, fan, air conditioner, and method for manufacturing stator
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Solution Overview
Problem
The manufacturing process of stators with annularly arranged cores faces challenges in maintaining motor efficiency due to increased outer diameter requirements, which are compromised when convex parts are formed on the cores for easier alignment, leading to decreased motor efficiency.
Innovation Solution
A stator design featuring a first core with a depression on its outer peripheral surface, allowing for easier annular arrangement of cores while preventing a drop in motor efficiency by optimizing the angles and shapes of the core backs and teeth, facilitating the use of jigs for alignment and connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If convex parts are formed on the outer peripheral surfaces of cores to facilitate annular arrangement, then the ease of arranging cores is improved, but the outer diameter of the stator core increases leading to decreased motor efficiency
Solution Approach 1:
Instead of adding convex parts that protrude outward, the invention uses concave depressions that indent inward. This inverts the conventional approach of adding material to facilitate alignment, and instead removes material to create alignment features, thereby avoiding the increase in outer diameter while still achieving easy annular arrangement of cores
Solution Approach 2:
The invention changes the geometric parameters of the core back by forming depressions with specific angles (θ1 and θ2) that satisfy θ1 + θ2 ≥ 90°. This parameter optimization allows the depressions to provide sufficient alignment guidance for annular arrangement while maintaining a compact outer diameter that preserves motor efficiency
2Ease of operation
If the outer diameter of the stator core is increased to accommodate alignment features, then the ease of arranging cores is improved, but the motor efficiency drops
Solution Approach 1:
The invention transitions the alignment feature from a radial dimension (convex parts on the outer surface) to a combination of circumferential and axial dimensions (depressions on the core back). By utilizing the axial depth and circumferential positioning of the depressions, the invention achieves alignment functionality without increasing the radial outer diameter, thus avoiding motor efficiency loss
Data Source
AI summary
A stator includes a first core that includes a first tooth extending in a first radial direction and a first core back extending in a circumferential direction and a second core that includes a second tooth extending in a second radial direction and a second core back extending in the circumferential direction. The first core back includes a depression formed with at least a first face and a second face in an outer peripheral surface of the first core back and a connection part facing the second core back. The stator satisfies θ1<θ2, where θ1 represents an angle between the first face and the first radial direction and θ2 represents an angle between the second face and the first radial direction.