Stator Core Teeth Fixing via Axial Connecting Portions
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Solution Overview
Problem
Conventional stator cores experience pulsation in torque due to magnetic flux short-circuiting through bridges connecting teeth, leading to noise and oscillation issues, especially in configurations with thin bridges and reduced rigidity.
Innovation Solution
A stator core design featuring a yoke member and teeth member with connecting portions that connect adjacent teeth, allowing for external lead wire insertion and reducing magnetic flux short-circuiting, while maintaining structural rigidity through precise manufacturing and assembly of laminated steel plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a bridge is used to connect ends of teeth at the radially inside, then the teeth are fixed together, but magnetic flux short-circuits through the bridge causing pulsation in torque
Solution Approach 1:
The patent removes the bridge component that caused magnetic flux short-circuiting. Instead of using a bridge to connect teeth ends, the invention extracts this harmful element while maintaining tooth fixation through alternative means (teeth pressed into grooves of the yoke member), thereby eliminating torque pulsation caused by magnetic flux short-circuiting.
2Object-generated harmful factors
If the bridge is formed thinner as much as possible, then pulsation in torque is reduced, but precise manufacturing is required and rigidity of teeth and bridge is reduced
Solution Approach 1:
The patent eliminates the bridge component entirely, removing the need for thin bridge formation and the associated manufacturing precision challenges. The teeth are fixed to the yoke member by pressing them into grooves without requiring a separate bridge structure, thereby avoiding both torque pulsation and precise manufacturing requirements.
3Object-generated harmful factors
If the bridge is formed thinner as much as possible, then pulsation in torque is reduced, but rigidity of teeth and bridge is reduced causing deformation
Solution Approach 1:
The patent removes the bridge component that caused rigidity issues. The teeth maintain sufficient rigidity through direct pressing into grooves of the yoke member, eliminating the need for a separate bridge structure that would require thin formation to reduce torque pulsation.
Solution Approach 2:
The patent merges the fixation function into the yoke member structure itself, where grooves in the yoke member directly hold the teeth. This integration eliminates the separate bridge component and its associated rigidity problems while maintaining structural integrity.
4Ease of operation
If teeth and yoke are separate components with bridge connection, then lead wire can be inserted from outside, but bridge causes magnetic flux short-circuiting
Solution Approach 1:
The patent removes the bridge component that caused magnetic flux short-circuiting while preserving the separate teeth and yoke structure. Lead wires can still be inserted from outside through the slots between teeth, and teeth are fixed to the yoke by pressing them into grooves without requiring a bridge connection.
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 reduces noise, oscillation, and pulsation in torque by enabling high-density distributed winding configurations and secure assembly of the stator core, enhancing magnetic efficiency and motor performance.
Implementation Method 1
Each projection may form a tooth. The teeth are formed of a steel plate stacked along a circumferential direction.
Implementation Method 2
At least one of the connecting portions connects a part of a tip end of one of the teeth in an axial direction with a part of a tip end of an other of the teeth in the axial direction... magnetic flux may short-circuit through the bridge when the rotary electric apparatus is in operation
Data Source
AI summary
A stator core includes a yoke member and a teeth member. The yoke member is in an annular shape. The teeth member includes teeth and connecting portions. The teeth are projected from the yoke member radially inward. The teeth are formed of a steel plate stacked along a circumferential direction. At least one of the connecting portions connects a part of a tip end of one of the teeth in an axial direction with a part of a tip end of an other of the teeth in the axial direction. The one of the teeth and the other of the teeth are adjacent to each other in the circumferential direction.