Stator Guard Plate Layout for Coil Winding Isolation
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Solution Overview
Problem
Conventional electric machines in electrically-assisted turbochargers suffer from coil winding degradation due to sharp bends and irregularities, leading to potential shorting and operational failures.
Innovation Solution
An electric machine design featuring a guard plate with radially extending teeth guards that prevent the coil winding from contacting the stator lamination stack, providing electrical insulation and allowing the coil winding to curve without sharp bends, thus preventing degradation and shorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil winding contacts the stator lamination stack, then the electric machine can be compact, but the coil winding degrades due to sharp bends and irregularities causing shorting
Solution Approach 1:
An electrically insulating component is introduced as an intermediary between the coil winding and the stator lamination stack. This component allows the coil winding to maintain close proximity to the stator for compactness while preventing direct contact that would cause sharp bends and degradation, thus resolving the contradiction between compactness and reliability.
2Device complexity
If the coil winding is allowed to curve freely, then the electric machine structure is simple, but the coil winding undergoes stress and degrades at particular sections
Solution Approach 1:
The electrically insulating component acts as a flexible guide surface that allows the coil winding to curve smoothly without sharp bends. This component provides structural support and guidance while maintaining flexibility, enabling the coil winding to follow a smooth path without stress concentration points that would cause degradation.
3Power
If the coil winding contacts the stator lamination stack, then electrical conduction occurs, but this causes shorting and prevents proper operation
Solution Approach 1:
The electrically insulating component serves as a mediator that prevents direct electrical contact between the coil winding and the stator lamination stack. This intermediary maintains the necessary electrical isolation to prevent shorting while allowing the magnetic field to pass through, thus preserving proper electric machine operation without harmful electrical conduction.
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 prevents coil winding degradation and shorting, ensuring proper operation of the electric machine by maintaining electrical isolation and reducing stress on the coil winding.
Implementation Method 1
The coil winding may transmit electric current through the coil winding to rotate the rotor
Implementation Method 2
Each of the plurality of teeth guards is aligned with one of the plurality of teeth of the stator lamination stack to electrically insulate the coil winding from the plurality of teeth of the stator lamination stack
Data Source
AI summary
An electric machine includes a rotor extending along an axis and a stator lamination stack radially spaced from the rotor. The stator lamination stack has circumferentially spaced teeth defining gaps therebetween. The electric machine also includes a coil winding disposed in the gaps between the circumferentially spaced teeth and a guard plate disposed at one of the first and second stator ends. The guard plate extends radially away from the axis and includes a plurality of teeth guards extending radially, with each of the teeth guards aligned with one of the teeth of the stator lamination stack to electrically insulate the coil winding from the teeth of the stator lamination stack. The plurality of teeth of the stator lamination stack extend radially inward toward the axis and the teeth guards of the guard plate extend radially inward toward the axis.