Rotary Electric Machine Unit Axial Length Reduction
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Solution Overview
Problem
Conventional rotary electric machine units face challenges in reducing size due to the protrusion of motor terminal blocks and conductive members, which occupy significant space and hinder miniaturization.
Innovation Solution
The rotary electric machine unit design includes a conductive member holder positioned outside the coil end in the radial direction and a terminal block fixed to the case, which electrically connects power distribution and conductive members, with the terminal block disposed outside the conductive member holder in the radial direction, allowing for overlap and reduced axial and radial dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the motor terminal block is disposed at a position overlapping with a stator in a radial direction and the motor terminal is attached from the longitudinal direction, then the motor terminal block and motor terminal can be electrically connected, but they protrude in the axial direction, making it difficult to reduce the size of the motor unit
Solution Approach 1:
The patent repositions the terminal block from the axial direction to the radial direction, arranging it outside the conductive member holder in the radial direction. This dimensional change allows the terminal block to be disposed at a position that does not protrude axially, thereby reducing the axial length of the motor unit while maintaining electrical connection functionality
Solution Approach 2:
The terminal block is arranged to overlap with the conductive member holder in the radial direction, with the terminal block disposed outside the conductive member holder. This nested arrangement allows both components to share the same radial space, reducing the overall radial width and preventing axial protrusion
2Length of moving object
If the terminal block and conductive member holder are arranged to minimize axial protrusion, then the axial length is reduced, but the radial space arrangement becomes more complex
Solution Approach 1:
The patent resolves the radial arrangement complexity by transitioning to a radial direction layout, where the terminal block is positioned outside the conductive member holder in the radial direction. This dimensional reorganization simplifies the spatial relationship between components, allowing them to be arranged concentrically around the stator without complex overlapping
Data Source
AI summary
A rotary electric machine unit includes: a rotary electric machine; and a case that accommodates the rotary electric machine. The rotary electric machine includes: a stator core; a multi-phase coil that is attached to the stator core; a conductive member holder that collectively holds a conductive member connected to a coil end of the multi-phase coil and is disposed outside the coil end in a radial direction; and a terminal block that is fixed to a fastening surface of the case and electrically connects a terminal portion of a power distribution member with a terminal portion of the conductive member. The terminal block is disposed outside the conductive member holder in the radial direction, and at least a part of the terminal block overlaps the conductive member holder in the radial direction.