Transposition Coil Insulation Layout for Lower Loss Motor Windings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in electric motor design is to balance core area and conductor size to minimize losses while ensuring mechanical strength and avoiding manufacturing issues such as conductor deformation and insulation damage, given the constraints of slot size and conductor ratio.
Innovation Solution
The solution involves a transposition coil design with multiple separately-insulated stacks and an outer main wall insulation, allowing for odd or varying numbers of turns per stack, and specific manufacturing methods like Zig-Zag-Then-Step and Double-series-stack-top-to-bottom-bridge to optimize conductor size and insulation distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the conductor width to thickness ratio is increased to reduce conductor losses, then conductor area increases and conductor losses decrease, but manufacturing becomes difficult and conductor deformation or insulation damage occurs
Solution Approach 1:
Instead of using a single wide conductor with high width-to-thickness ratio that is difficult to manufacture, the conductor is segmented into multiple thinner conductors arranged in separate stacks. Each individual conductor has a manageable width-to-thickness ratio that is easy to manufacture and handle, while the combined effect of multiple conductors achieves the desired total conductor area for minimizing losses
Solution Approach 2:
Each separate stack receives dedicated main wall insulation tailored to its specific requirements, and the stacks are arranged with appropriate spacing. This localized approach allows each conductor to be optimally insulated and positioned, facilitating easier manufacturing and assembly while maintaining electrical performance
2Reliability
If dedicated main wall insulation is provided for each separate stack instead of a single outer insulation layer, then insulation reliability improves and electrical isolation is enhanced, but device complexity and manufacturing steps increase
Solution Approach 1:
The insulation system is segmented into two levels: dedicated main wall insulation applied to each separate stack individually, and then an outer main wall insulation layer applied to the entire coil assembly. This hierarchical segmentation provides enhanced electrical isolation and reliability at each level while organizing the complexity into manageable, systematic steps
Solution Approach 2:
Dedicated main wall insulation is applied to each separate stack before the stacks are assembled into the final coil configuration. This preliminary insulation step ensures that each conductor bundle is already protected and electrically isolated before assembly, simplifying the overall manufacturing process and enhancing reliability by preventing insulation damage during assembly operations
Data Source
AI summary
Transposition coils and insulation for transposition coils. One example provides a method including providing a first conductor and a second conductor in at least two separate stacks, the first conductor extending along a first axis and the second conductor extending along a second axis, forming a double stack, forming a bridge connection between the at least two separate stacks, providing each of the two separate stacks with a dedicated main wall insulation that encircles exactly one of the at least two separate stacks, and providing an outer main wall insulation that encircles the at least two separate stacks.