Stator Interphase Insulation Paper for Rotating Electric Machines
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Solution Overview
Problem
Existing stators of rotating electrical machines face challenges in effectively insulating between coil ends of unit coils within the same phase without increasing material or operational costs, particularly under high voltage conditions in inverter drive systems.
Innovation Solution
The implementation of interphase insulation paper with elongate bodies and connecting strips, strategically placed between coil ends of different phases, functions as insulation for both different and same phases, reducing material costs and operational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate insulation papers are provided for both inter-phase and intra-phase insulation, then insulation reliability is improved, but device complexity and material costs increase
Solution Approach 1:
The interphase insulation paper is designed with protruding ends that extend beyond the slot openings, enabling it to simultaneously perform inter-phase insulation (between different phases) and intra-phase insulation (between adjacent unit coils of the same phase). This multi-functional design eliminates the need for separate insulation papers, reducing device complexity while maintaining insulation reliability.
Solution Approach 2:
The patent combines the functions of interphase insulation paper and intra-phase insulation paper into a single interphase insulation paper component. By integrating both insulation functions into one element, the number of parts is reduced, assembly steps are simplified, and overall device complexity is decreased while ensuring both insulation requirements are met.
2Reliability
If separate insulation papers are provided for both inter-phase and intra-phase insulation, then insulation reliability is improved, but material costs increase
Solution Approach 1:
The interphase insulation paper serves dual purposes: providing inter-phase insulation between different phases and intra-phase insulation between adjacent unit coils. This eliminates the need to purchase and install separate intra-phase insulation papers, reducing material costs while maintaining both insulation functions.
Solution Approach 2:
By merging the functions of two separate insulation papers into one, the total quantity of insulation material required is reduced. The single interphase insulation paper with protruding ends replaces what would otherwise require two separate papers, directly reducing material costs.
3Reliability
If multiple types of insulation papers are used, then insulation performance is improved, but the number of working steps increases
Solution Approach 1:
The patent merges the installation of interphase and intra-phase insulation papers into a single step. The interphase insulation paper is placed in the slot, and its protruding ends automatically provide intra-phase insulation, eliminating the need for a separate installation step for intra-phase insulation and reducing the total number of working steps.
Solution Approach 2:
The interphase insulation paper is pre-designed with protruding ends that extend beyond the slot openings. This preliminary structural preparation ensures that when the paper is installed, it automatically performs both inter-phase and intra-phase insulation functions, eliminating the need for additional working steps to install separate intra-phase insulation.
4Quantity of substance
If only interphase insulation paper is used, then material costs are reduced, but intra-phase insulation may be insufficient
Solution Approach 1:
The interphase insulation paper is designed with protruding ends that extend beyond the slot openings, enabling it to simultaneously provide intra-phase insulation between adjacent unit coils. This multi-functional design ensures that intra-phase insulation reliability is maintained while using only interphase insulation paper, reducing material costs.
Solution Approach 2:
By combining interphase and intra-phase insulation functions into a single paper component, the patent reduces material costs while ensuring both insulation requirements are met. The protruding ends of the interphase insulation paper provide the necessary intra-phase insulation, eliminating the need for separate intra-phase insulation material.
Data Source
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AI summary
A stator of a rotating electrical machine includes a stator core (2) which is annular in shape, a plurality of stator coil groups (3, 4, 5) constituting a plurality of phases, each-phase stator coil group (3, 4, 5) being wound on the stator core (2) and including a plurality of unit coils (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4; 4a1, 4a2, 4a3, 4a4, 4b1, 4b2, 4b3, 4b4; 5a1, 5a2, 5a3, 5a4, 5b1, 5b2, 5b3, 5b4) connected to each other, and a plurality of pieces of interphase insulation paper (10, 10A, 10B, 10C, 10D, 10E, 10F, 10G) for insulation of coils belonging to different phases, disposed between coil ends of the unit coils belonging to different phases at both axial ends of the stator core (2), the interphase insulation paper pieces (10, 10A, 10B, 10C, 10D, 10E, 10F, 10G) having ends which are inserted between the coil ends of the unit coils belonging to an identical phase, respectively.