Electrical Winding Insulation Layout for Heat and Voltage Balance
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Solution Overview
Problem
Conventional electrical windings face performance limitations due to insulation that acts as both thermal and electrical insulator, leading to thermal, electrical, and power performance constraints.
Innovation Solution
The electrical winding design features a single row of turns with varying insulation thickness and material, where the conductor insulation is thinner and made of materials like polyimide, and the turn insulation is thicker and made of materials with higher thermal conductivity such as fused silica or Alumina, impregnated with a thermoset resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation material is used that acts as both thermal and electrical insulator, then electrical insulation performance is improved, but thermal performance deteriorates
Solution Approach 1:
The patent applies different insulation materials with different properties to different locations: conductor insulation uses materials like polyimide for electrical insulation, while turn insulation uses materials like fused silica or Alumina with higher thermal conductivity for thermal management. This local differentiation resolves the contradiction by optimizing each location for its specific requirement.
Solution Approach 2:
The patent employs composite insulation structures where turn insulation combines materials with high thermal conductivity (fused silica, Alumina, Beryllia, Boron Nitride, or Aluminum Nitride) while maintaining electrical insulation properties. This composite approach allows simultaneous achievement of electrical insulation and thermal management.
2Reliability
If insulation thickness is increased to improve electrical performance, then voltage withstanding capability is improved, but conductor slot fill deteriorates
Solution Approach 1:
The patent uses different insulation thicknesses for different locations: conductor insulation is kept thin (ratio of thickness to conductor diameter between 0.01 to 0.1) to maximize slot fill, while turn insulation is made thicker to provide adequate voltage withstanding capability between turns. This local differentiation resolves the contradiction.
Solution Approach 2:
The patent changes the insulation thickness parameter strategically: thin conductor insulation (0.01 to 0.1 times conductor diameter) maximizes conductor fill factor while still providing necessary electrical insulation, and thicker turn insulation provides voltage withstanding capability. This parameter optimization resolves the contradiction between slot fill and voltage capability.
3Ease of manufacture
If conventional insulation design is used, then manufacturing simplicity is maintained, but thermal resistance increases
Solution Approach 1:
The patent changes the thermal conductivity parameter of the insulation materials by selecting materials with high thermal conductivity (fused silica, Alumina, Beryllia, Boron Nitride, or Aluminum Nitride) for turn insulation while maintaining the braid or serve structural form factor. This allows improved thermal performance while retaining manufacturing simplicity through impregnation processes.
Solution Approach 2:
The patent uses composite materials where the turn insulation combines high thermal conductivity materials (fused silica, Alumina, etc.) with thermoset resin impregnation to create a structure that maintains manufacturing simplicity while achieving low thermal resistance. The impregnation process is a conventional manufacturing technique that now produces thermally optimized insulation.
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 design enhances thermal and electrical performance by minimizing thermal resistance, maximizing conductor fill factor, and effectively withstanding high voltages, thereby improving the overall efficiency and power handling capacity of the electrical winding.
Implementation Method 1
the braid is impregnated with a thermoset resin... passes through no more than two layers of the first turn insulation... radial heat transfer path
Implementation Method 2
the first turn insulation has a dielectric strength less than 4000 V/mil... the first turn insulation has a dielectric strength within a range of 400 V/mil and 500 V/mil
Data Source
AI summary
An electrical winding including a single row of turns, with a first turn having a first turn insulation and a first plurality of conductors positioned within the first turn insulation. The first turn also includes a first conductor insulation coupled to each of the first plurality of conductors. The first conductor insulation has a first thickness of a first material, and the first turn insulation has a second thickness of a second material. The second thickness is larger than the first thickness.