Bus Bar Unit Radial Dimension Reduction via Stator Engagement
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Solution Overview
Problem
Conventional bus bar units for rotary electric machines have a large radial dimension due to the need for extending parts with engaging protrusions, which increases the overall size and complexity.
Innovation Solution
A bus bar unit with a bus bar holder formed by an insulating member that includes an engaging part to snap-fit with an extending part from the stator, eliminating the need for extending parts on the holder and reducing the radial dimension by integrating the engaging mechanism into the stator's insulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extending parts with engaging protrusions are provided on the bus bar holder, then the bus bar unit can be engaged with the stator, but the radial dimension of the bus bar unit increases
Solution Approach 1:
The invention inverts the conventional arrangement by moving the engaging protrusions from the bus bar holder to the stator's insulator. This inversion allows the bus bar holder to have a smaller radial dimension while maintaining engagement functionality, as the protrusions now originate from the stator side rather than requiring additional radial space on the bus bar holder.
Solution Approach 2:
The insulator of the stator acts as an intermediary element that provides the engaging protrusions. Instead of the bus bar holder directly providing engagement features, the stator's insulator serves as the mediating structure that enables engagement, thereby reducing the radial dimension requirements of the bus bar holder.
2Reliability
If the bus bar holder has a larger diameter to accommodate extending parts, then engagement is achieved, but the overall size and complexity of the bus bar unit increases
Solution Approach 1:
The invention merges the engaging protrusions into the stator's insulator structure, combining two functions (insulation and engagement) into a single integrated component. This eliminates the need for separate extending parts on the bus bar holder, thereby reducing structural complexity while maintaining engagement capability.
Solution Approach 2:
By inverting which component provides the engaging protrusions (from bus bar holder to stator insulator), the invention simplifies the bus bar holder structure and reduces its required diameter, thereby decreasing overall device complexity.
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 reduces the radial dimension of the bus bar unit, simplifies the manufacturing process, and enhances the reliability of the assembly by eliminating the need for additional protrusions, thereby improving the overall efficiency and performance of the rotary electric machine.
Implementation Method 1
a bus bar holder formed by an insulating member, the bus bar holder being configured to hold the bus bar. The bus bar holder includes an engaged part which is configured to be engaged with an engaging part formed at an extending part extended from the stator in axial direction of the stator.
Data Source
AI summary
A bus bar unit includes a bus bar for energizing a coil wound around a stator; and a bus bar holder formed by an insulating member and holds the bus bar. The bus bar holder includes an engaged part which is configured to be engaged with an engaging part formed at an extending part extended from the stator in axial direction of the stator.