Stator Coil Arrangement for High Voltage Insulation
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Solution Overview
Problem
Conventional rotating electrical machines for vehicles face challenges in achieving effective insulation and handling high power supply voltages, leading to reduced performance and increased size due to the need for additional insulators.
Innovation Solution
The stator of a rotating electrical machine is designed with a specific configuration of unit coils, where the first and second coil groups have alternating unit coils connected in series, with connecting wires arranged to minimize potential differences and enhance insulation, allowing for improved electrical insulation without additional insulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stator windings with series coils connected in parallel are used, then the motor can operate, but insulation performance deteriorates under high power supply voltages requiring additional insulators
Solution Approach 1:
The stator winding is segmented into multiple unit coils (first through fourth unit coils) that are arranged in a specific spatial sequence around the stator core. This segmentation allows each unit coil to be positioned to minimize potential differences, eliminating the need for additional insulators while maintaining insulation performance under high voltage conditions.
Solution Approach 2:
The unit coils are arranged in a specific circumferential sequence (first, second, third, fourth unit coils) to create equipotential regions that minimize potential differences between adjacent coils. This equipotential arrangement prevents insulation breakdown under high power supply voltages without requiring additional insulating components.
2Reliability
If additional insulators are added to improve insulation performance, then insulation performance improves, but device complexity and size increase
Solution Approach 1:
The winding is divided into multiple unit coils arranged in a specific sequence, which inherently provides insulation through spatial distribution rather than requiring additional insulating materials, thus maintaining compact stator dimensions.
Solution Approach 2:
The arrangement parameters of the unit coils (their circumferential positions and connections) are optimized to minimize potential differences, achieving effective insulation without changing the physical dimensions or adding insulating components to the stator.
3Reliability
If unit coils are arranged to minimize potential differences, then insulation performance improves, but manufacturing complexity increases
Solution Approach 1:
The winding is segmented into discrete unit coils with standardized connection patterns. This segmentation creates a repeatable manufacturing process where each unit coil follows the same arrangement rules, simplifying production despite the complex overall configuration.
Solution Approach 2:
The unit coils are arranged with specific connection parameters (series connections between adjacent unit coils in circumferential order) that, while precise, follow a systematic pattern that can be standardized for manufacturing.
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
This configuration enhances insulation performance, enabling the stator to handle high power supply voltages effectively, reducing the need for additional insulators and allowing for a more compact and high-output permanent magnet motor design.
Implementation Method 1
a stator of a rotating electrical machine includes a stator core and stator coils of a plurality of phases wound on the stator core
Data Source
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AI summary
A stator of rotating electrical machine includes a stator core (4) and stator coils (5). The stator coils (5) have n number (where n≥6) unit coils (U1-U4, U1'-U4', V1-V4, Vl'-V4', W1-W4, W1'-W4'), a first coil group (5u1, 5v1, 5w1) and a second coil group (5u2, 5v2, 5w2). The unit coils of the first coil group (5u1, 5v1, 5w1) include a first unit coil (A1) located nearest a first power supply terminal (Pu1). The unit coils of the first coil group (5u1, 5v1, 5w1) include a second unit coil (B1). The unit coils of the first coil group (5u1, 5v1, 5w1) include a third unit coil (A3) located third nearest the first power supply terminal (Pu1) and adjacent to the second unit coil of the second coil group (5u2, 5v2, 5w2). The unit coils of the second coil group (5u2, 5v2, 5w2) include a third unit coil (B3) located third nearest the second power supply terminal (Pu2) and adjacent to the second unit coil of the first coil group (5u1, 5v1, 5w1).