Stator Neutral Bus Bar Layout for Shorter Axial Motor Length
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Solution Overview
Problem
Conventional three-phase alternating current motors with neutral bus bars positioned on the outer side of the coils in the axial direction result in an increased motor length.
Innovation Solution
The neutral bus bar is connected to lead wires bent in a radial direction, allowing it to be positioned closer to the center of the stator, thereby reducing the axial length of the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the neutral bus bar is disposed on the outer side of the coils in the axial direction, then the motor structure is simplified and easier to manufacture, but the length of the motor in the axial direction becomes longer
Solution Approach 1:
The patent changes the spatial arrangement of the neutral bus bar from an axial direction placement (outer side of coils) to a radial direction placement (inner side near stator center). This dimensional change allows the bus bar to connect to lead wires that extend radially from the coil ends, thereby reducing the axial length of the motor while maintaining the electrical connection function.
Solution Approach 2:
Instead of extending the lead wires axially outward to reach the neutral bus bar (conventional approach), the patent inverts the arrangement by having the lead wires extend radially inward toward the stator center, where the neutral bus bar is positioned. This inversion of the spatial relationship between components achieves compact axial dimensions.
2Device complexity
If the neutral bus bar is disposed on the outer side of the coils in the axial direction, then the electrical connection is simplified, but the motor length in the axial direction increases
Solution Approach 1:
The patent repositions the neutral bus bar from the axial outer side to the radial inner side near the stator center. The lead wires are configured to extend radially from the coil ends to connect to the bus bar. This spatial reconfiguration reduces axial length while the bus bar maintains its electrical connection function through radial alignment with the lead wires.
3Length of moving object
If the lead wires are bent in the radial direction, then the neutral bus bar can be positioned closer to the stator center, but the lead wire configuration becomes more complex
Solution Approach 1:
The patent inverts the conventional lead wire arrangement by bending the lead wires radially inward instead of extending them axially outward. The lead wires extend from the coil ends in the radial direction to reach the neutral bus bar positioned near the stator center. This inversion achieves compact axial dimensions while the added radial bending provides structural support and positioning.
Solution Approach 2:
The patent applies different spatial configurations to different parts of the lead wire system: the main body of the lead wires maintains simple axial connections to coils, while only the terminal portions are bent radially to connect to the neutral bus bar. This localized complexity minimizes overall device complexity while achieving the axial length reduction goal.
Data Source
AI summary
A motor includes a plurality of coils wound around a stator, and a neutral bus bar connecting the plurality of coils to each other. A plurality of lead wires connected to the plurality of coils respectively is bent in a radial direction of the stator from an axial direction of the stator. The neutral bus bar is connected to a portion of the plurality of lead wires that extends in the radial direction.