Induction Motor End Coil Cooling With Heat-Conducting Particles
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Solution Overview
Problem
Induction motor end coils experience inefficient cooling due to their non-uniform shape and exposure to air, leading to excessive heat generation and reduced performance, with existing methods like direct refrigerant spraying causing torque loss and complicating maintenance.
Innovation Solution
An end coil cooling structure featuring a shielding member and heat conducting particles that form an enclosed space around the end coil, with optional non-moving or moving refrigerant and a refrigerant flow pipe to enhance heat transfer and maintainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If direct cooling by spraying refrigerant into the end coil is used, then cooling efficiency is improved, but torque loss increases and maintenance becomes difficult
Solution Approach 1:
The patent introduces a cooling plate as an intermediary component between the refrigerant and the end coil. The cooling plate absorbs heat from the end coil through thermal conduction and transfers it to the refrigerant, avoiding direct refrigerant contact with the end coil. This resolves the contradiction by improving cooling efficiency while preventing torque loss from refrigerant penetration into air gaps.
Solution Approach 2:
The patent replaces the direct mechanical spraying method with a thermal conduction-based cooling system. Instead of mechanically injecting refrigerant directly onto the end coil, the system uses a cooling plate to transfer heat through thermal conduction, then removes the heat via refrigerant evaporation. This substitution eliminates the harmful effects of direct refrigerant contact while maintaining effective cooling.
2Temperature
If direct refrigerant spraying is used for end coil cooling, then cooling effectiveness is improved, but device complexity and maintenance difficulty increase
Solution Approach 1:
The cooling plate serves as a simplified intermediary structure that provides a stable thermal interface between the end coil and refrigerant. This simple plate design avoids the complexity of direct spraying mechanisms while maintaining effective heat transfer, and its solid structure facilitates easier assembly and maintenance compared to liquid injection systems.
3Ease of manufacture
If non-uniform cooling is applied to coil windings, then manufacturing is simpler, but control precision decreases due to temperature differences
Solution Approach 1:
The patent applies local quality by positioning the cooling plate specifically at the end coil location where heat generation is most intense. The cooling system is tailored to the specific thermal characteristics of the end coil region, providing enhanced cooling where needed most while maintaining uniform temperature distribution in that critical area, thereby preserving control precision without overly complicating the overall system.
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 solution effectively addresses the cooling inefficiency of induction motor end coils by improving heat conduction and reducing temperature differences, thereby enhancing motor performance and control precision while simplifying maintenance.
Implementation Method 1
a plurality of heat conducting particles disposed to fill the enclosed space and configured to come into contact with the end coil
Implementation Method 2
a non-moving refrigerant injected to impregnate the heat conducting particles with
Data Source
AI summary
An end coil cooling structure includes: a shielding member which is disposed within a motor housing, surrounds an area where an end coil is disposed, and forms an enclosed space; and a plurality of heat conducting particles disposed to fill the enclosed space and to come into contact with the end coil.