Stator Busbar Vibration Damping via Radial-Circumferential Orientation
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Solution Overview
Problem
Stators for rotating electric machines face increased vibration influences due to circumferential and radial vibrations, which affect the stator coil's stability and performance, particularly when using long bridging wires or busbars.
Innovation Solution
The stator design incorporates a three-phase stator coil with interphase bridging wires made of busbars, where the busbars have connecting end portions oriented in both circumferential and radial directions to effectively dampen vibrations, enhancing the stator coil's resistance to both types of vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If long bridging wires are employed to connect phase windings at the neutral point, then the stator coil can be assembled, but the influence of circumferential vibration on the stator coil is increased
Solution Approach 1:
The bridging wire is segmented into multiple shorter sections with intermediate support points provided by the busbar structure. Instead of using a single long bridging wire that spans the entire coil end, the connection is divided into multiple segments supported by the busbar, reducing the span length and thereby reducing the influence of circumferential vibration on each segment.
2Ease of manufacture
If a busbar is employed to connect phase windings at the neutral point, then the stator coil can be assembled, but the influence of radial vibration on the stator coil is increased due to the weight of the busbar
Solution Approach 1:
The busbar is designed with varying cross-sectional dimensions along its length, with the width and thickness being smaller at the intermediate portion compared to the end portions. This local quality variation reduces the weight and moment of inertia of the busbar, thereby reducing the influence of radial vibration caused by the busbar's weight, while still maintaining sufficient mechanical strength at the connection points.
3Ease of manufacture
If the busbar has uniform cross-section, then the manufacturing is simple, but the resistance to both circumferential and radial vibrations is insufficient
Solution Approach 1:
The busbar features a non-uniform cross-section with the width and thickness being smaller at the intermediate portion and larger at the end portions. This local quality variation optimizes the balance between manufacturing complexity and vibration resistance, providing enhanced stiffness at the connection points while reducing weight and vibration influence in the intermediate span.
Data Source
AI summary
A stator includes an annular stator core and a three-phase stator coil. The stator coil is comprised of a plurality of star-connected phase windings. The stator coil further has a plurality of interphase bridging wires to electrically connect neutral point-side ends of the phase windings to each other. The interphase bridging wires are arranged on a coil end of the stator coil. At least one of the interphase bridging wires is made up of at least one busbar. The busbar includes three or four connecting end portions each having a joining surface joined to one of the phase windings, other bridging wires and other busbars. The connecting end portions are arranged so that some of the joining surfaces of the connecting end portions face substantially in the circumferential direction of the stator core, while the other joining surfaces face substantially in a radial direction of the stator core.