Rotating Electrical Machine Rotor Coil Ventilation
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Solution Overview
Problem
Conventional rotating electrical machines do not sufficiently exert a cooling effect despite being configured to satisfy specific ventilation passage dimensions, leading to inadequate heat dissipation.
Innovation Solution
The rotating electrical machine features a rotor with coil slots, sub slots, and wedge-shaped ventilation passages arranged in two lines, where the ventilation passages penetrate the winding conductor radially, allowing cooling gas to flow efficiently, with specific width ratios optimized to enhance cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ventilation passages are formed in two lines with WH/WC ratio of 0.1-0.35, then the structural configuration meets design specifications, but the cooling effect is not sufficiently exerted
Solution Approach 1:
The ventilation passages are segmented into two distinct lines (first and second lines) arranged in the width direction of the conductor. Each line contains multiple passages spaced at specific intervals, creating a segmented cooling path that improves cooling efficiency while maintaining manageable structural complexity.
Solution Approach 2:
The ventilation passages are strategically positioned at specific locations within the conductor width, with different spacing arrangements in the first line versus the second line. This local optimization of passage placement ensures efficient cooling at critical heat generation zones while satisfying the WH/WC ratio constraints.
2Temperature
If the width dimension ratio W4/W3 is kept small to maintain structural integrity, then the conductor stability is maintained, but the cooling effect is insufficient
Solution Approach 1:
The invention optimizes the W4/W3 ratio parameter within the specific range of 0.025-0.08, balancing the cooling effectiveness with structural integrity. Additionally, the W1/W2 ratio parameter is controlled at 0.3-0.7 to optimize the spacing arrangement. These parameter optimizations enable sufficient cooling while maintaining conductor stability.
3Temperature
If more ventilation passages are added to increase cooling area, then the cooling effect improves, but the conductor width ratio WH/WC exceeds the conventional limit
Solution Approach 1:
Instead of simply increasing the number of passages in a single line, the invention utilizes two dimensional arrangement by creating two separate lines of ventilation passages. This spatial reorganization allows for increased total ventilation area while controlling the WH/WC ratio by distributing passages across different spatial dimensions (width direction) rather than concentrating them in one location.
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 enables efficient cooling, allowing for increased field current and output without relying on the cooler or specific cooling gas types, effectively minimizing temperature increase in the rotor coil.
Implementation Method 1
ventilation passages penetrating the winding conductor in the radial direction of the rotor so as to allow cooling gas to flow from the sub slot toward the wedge
Data Source
AI summary
A rotating electrical machine is configured such that, in a rotor coil, ventilation passages are formed in two lines arranged in a width direction of the rotor coil, and formed in the same shape at a plurality of positions spaced from each other in a longitudinal direction, 0.3≦W1/W2≦0.7 . . . (Expression 1) is satisfied, where (W1) is a width dimension of the ventilation passage in the longitudinal direction and (W2) is a width dimension from one end of the ventilation passage to one end of another ventilation passage adjacent thereto, and 0.025≦W4/W3≦0.08 . . . (Expression 2) is satisfied, where (W3) is a width dimension of the rotor coil and (W4) is a width dimension of the ventilation passage.