Motor Neutral Point Bus Bar Overlap for Connection Efficiency
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Solution Overview
Problem
In motors with redundant configurations and multiple coil groups, the increased number of bus bars and connection points leads to reduced work efficiency due to close intervals between connection portions, making the connection process less efficient.
Innovation Solution
The motor design includes a stator with a plurality of neutral point bus bars disposed on both sides of the coils in the axial direction, where at least two neutral point bus bars overlap in the radial direction, allowing for a more efficient connection process by distributing connection points and maintaining stability during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plurality of bus bars are used to connect multiple coil groups with different control systems, then the rotation function can be continued even when a control system fails, but the number of connection portions increases and work efficiency decreases
Solution Approach 1:
The patent combines multiple neutral point bus bars onto a single support member, merging what would otherwise be separate connection components. This reduces the number of discrete connection portions and improves work efficiency while maintaining the redundant control system capability
Solution Approach 2:
The support member serves multiple functions: it supports multiple neutral point bus bars, provides positioning in the axial direction, and facilitates the connection process. This multi-functionality reduces the need for additional components and improves connection efficiency
2Ease of operation
If connection portions are arranged in the circumferential direction, then all connections can be made on one side, but the intervals between connection portions become small and work efficiency decreases
Solution Approach 1:
The patent transitions from arranging connection portions only in the circumferential direction to utilizing both the axial and radial directions. By positioning neutral point bus bars on the inner circumferential side and arranging them along the axial direction, connection portions are distributed more sparsely, improving work efficiency
3Ease of operation
If multiple neutral point bus bars are disposed on the same side, then connection is simplified, but the intervals between connection portions become small
Solution Approach 1:
The patent positions neutral point bus bars at different locations: some on the inner circumferential side and others on the outer circumferential side. This non-uniform distribution creates larger intervals between connection portions while keeping all connections accessible from one side
Data Source
AI summary
A motor includes a stator including a stator core and coils, and neutral point bus bars disposed on a first side of the coils in an axial direction. The plural coils include a first coil group of a first control system, and a second coil group of a second control system. The neutral point bus bars include a first neutral point bus bar to which the coils of the first coil group are electrically connected, and a second neutral point bus bar to which the coils of the second coil group are connected. At least two of the neutral point bus bars are disposed at positions that overlap each other in the radial direction.