Insulated Stator Teeth Structure for Heat Transfer and Rigidity
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Solution Overview
Problem
Existing stator designs face challenges in maintaining rigidity while effectively transferring heat from the winding to the stator core, particularly in high-output and compact electric motors.
Innovation Solution
The stator design incorporates a stator core with teeth that have through-hole portions filled with a thermally conductive substance, and an insulator with long and short side surface-covering portions that are integrated to provide structural integrity and enhance heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the insulator is provided with a hole portion to transfer heat from the winding to the stator core, then heat transfer efficiency is improved, but rigidity of the insulator and stator core decreases
Solution Approach 1:
The insulator is designed with differentiated regions: hole portions in some teeth for heat transfer, and solid portions in other teeth for structural support. This local differentiation allows the system to simultaneously achieve both heat transfer efficiency and rigidity requirements without compromising either function.
2Temperature
If the through-hole portion penetrates through the tooth from one short side surface to the other short side surface, then heat transfer path is improved, but structural integrity of the tooth is reduced
Solution Approach 1:
Through-hole portions are selectively provided in specific teeth where heat transfer is prioritized, while other teeth maintain solid structures for structural integrity. This local differentiation optimizes the overall system by distributing heat transfer functions and structural support functions across different teeth.
Solution Approach 2:
The insulator combines thermally conductive materials in the through-hole portions with insulating materials in the solid portions, creating a composite structure that simultaneously achieves thermal conduction where needed and electrical insulation where required, while maintaining structural integrity.
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
This configuration ensures the rigidity of the insulator and stator core while facilitating efficient heat transfer from the winding to the stator core, thereby addressing the thermal resistance issues in high-output electric motors.
Implementation Method 1
A thermally conductive substance that is more thermally conductive than the insulator is provided on a portion of the long side surface exposed by the opening portion
Data Source
AI summary
A stator includes: a stator core having an annular shape; teeth that protrudes inwardly in a radial direction from an inner peripheral surface of the stator core; an insulator that covers the teeth; and a winding wound around the teeth with the insulator interposed between the winding and the teeth. The teeth includes: a right surface extending in a first direction along a central axis of the stator core; a left surface extending in the first direction; a top surface that extends between the right surface and the left surface in a second direction intersecting the first direction; a bottom surface that extends between the right surface and the left surface in the second direction; and a through-hole portion penetrating through the teeth from the top surface to the bottom surface.