Rotary Electric Machine Bridge Conductor Arrangement
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Solution Overview
Problem
Conventional rotary electric machines face challenges in efficiently arranging and connecting element conductors in slots to minimize magnetic flux variation and torque noise, leading to increased size and noise issues.
Innovation Solution
A rotary electric machine design featuring a three-phase coil configuration with specific arrangements of element conductors in series, connected via bridge conductors, which are arranged in a protruding shape to optimize space and reduce overlap, allowing for efficient magnetic flux generation and reduced torque variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If element conductors are connected in series with conventional bridge conductor arrangements, then the rotary electric machine achieves basic functionality, but the height and width of bridge conductors increase leading to larger device size
Solution Approach 1:
The patent applies dimensionality change by arranging bridge conductors in the circumferential direction rather than only in the axial direction. Specifically, odd-numbered phase coils are arranged on the inner circumference while even-numbered phase coils are arranged on the outer circumference, creating a two-dimensional layout that reduces the axial height and radial width of bridge conductors while maintaining electrical connectivity.
Solution Approach 2:
The patent employs asymmetric arrangement where phase coils are differentiated by odd and even numbering with distinct circumferential positions. This asymmetric configuration allows bridge conductors to connect element conductors more efficiently by utilizing the circumferential dimension, thereby reducing the overall device size without compromising functionality.
2Volume of moving object
If bridge conductors are arranged to connect element conductors efficiently, then device size is reduced, but torque noise and magnetic flux variation increase
Solution Approach 1:
The patent applies local quality by assigning specific arrangement patterns to different phase coils based on their odd or even numbering. This localized differentiation optimizes the bridge conductor layout for each phase while maintaining overall balance, reducing torque noise and magnetic flux variation even with compact dimensions.
Solution Approach 2:
By utilizing the circumferential dimension for bridge conductor arrangement, the patent achieves compact device size while distributing magnetic flux more evenly. This multi-dimensional approach prevents concentration of magnetic flux in单一 areas, thereby reducing torque noise and harmful variations.
3Ease of manufacture
If conventional bridge conductor configurations are used, then manufacturing is simplified, but the height and width of the rotary electric machine increase
Solution Approach 1:
The patent transitions from conventional axial arrangement to a circumferential arrangement strategy, utilizing the circumferential dimension to reduce axial height and radial width. This dimensional shift enables compact machine dimensions while maintaining manufacturability through systematic arrangement rules for odd and even phase coils.
Solution Approach 2:
The patent segments phase coils into odd-numbered and even-numbered groups with distinct circumferential positions. This segmentation simplifies the manufacturing process by providing clear arrangement rules for different phases while achieving reduced device dimensions through the circumferential layout strategy.
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
The design achieves miniaturization of the rotary electric machine by reducing the height and width of bridge conductors, minimizing torque noise, and ensuring smooth magnetic flux distribution, thereby inhibiting torque variation and reducing noise.
Implementation Method 1
a three-phase coil consisting of a first phase coil, a second phase coil, and a third phase coil for magnetic flux generation
Data Source
AI summary
A rotary electric machine includes a three-phase coil including a first phase coil, a second phase coil, and a third phase coil for magnetic flux generation. A bridge conductor connecting an ath end and a bth end of the first phase coil, and a bridge conductor connecting the ath end and the bth end of the third phase coil are provided in a protruding shape on one side of a stator in a radial direction when viewed in a axial direction of the stator. A bridge conductor connecting the ath end and the bth end of the second phase coil is provided in a protruding shape on the other side of the stator in the radial direction when viewed in the axial direction of the stator. The bridge conductor of each coil in the three-phase coil is arranged at the same height position in the axial direction.