Rotary Electric Machine Refrigerant Guide Unit for Coil Cooling
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Solution Overview
Problem
Existing rotary electric machines face challenges in uniformly cooling the coil end portions, as refrigerant is primarily supplied to the inner peripheral portion, leaving the outer peripheral portion inadequately cooled, which can lead to performance degradation and potential demagnetization of permanent magnets.
Innovation Solution
A rotary electric machine design that includes a refrigerant guide unit on the stator core end surface to direct refrigerant radially outward and guide it to the coil end portion, ensuring uniform cooling by utilizing a refrigerant guide unit with multiple guide surfaces and step portions to spread the refrigerant effectively across the coil end surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If refrigerant is supplied to the inner peripheral portion of the coil end portion, then the inner peripheral portion can be cooled, but the outer peripheral portion is not cooled uniformly
Solution Approach 1:
The refrigerant guide unit is divided into multiple guide surfaces (first guide surface, second guide surface, third guide surface) that segment the refrigerant flow path. This segmentation directs refrigerant to different regions of the coil end portion systematically, ensuring both inner and outer peripheral portions receive adequate cooling.
Solution Approach 2:
Different guide surfaces are positioned to provide localized cooling to different regions of the coil end portion. The first guide surface directs refrigerant to the inner peripheral portion, while the second and third guide surfaces direct refrigerant to the outer peripheral portion, creating locally optimized cooling quality throughout the entire coil end portion.
2Ease of operation
If refrigerant is discharged radially outward of the rotor, then the refrigerant can be supplied to the coil end portion, but the refrigerant does not reach the outer peripheral portion effectively
Solution Approach 1:
The refrigerant guide unit utilizes multiple spatial dimensions by arranging guide surfaces at different positions and orientations. The first guide surface operates in one radial dimension, while the second and third guide surfaces extend cooling coverage to outer peripheral regions in different spatial dimensions, achieving comprehensive three-dimensional cooling coverage.
Solution Approach 2:
The refrigerant guide unit acts as an intermediary between the refrigerant discharge source and the coil end portion. It mediates the refrigerant flow by using multiple guide surfaces to redistribute the refrigerant from the discharge point to both inner and outer peripheral portions of the coil end portion, ensuring uniform cooling distribution.
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 solution enables uniform cooling of the coil end portion, preventing performance degradation and demagnetization, by efficiently directing refrigerant to both inner and outer peripheral areas of the coil, thereby maintaining the machine's efficiency and extending its operational lifespan.
Implementation Method 1
a refrigerant guide unit configured to guide the refrigerant discharged radially outward of the rotor in a protruding direction of the coil end portion is disposed on the first stator core end surface
Data Source
AI summary
A rotary electric machine includes a rotor having a rotor core, an end plate disposed on a rotor core end surface, and a stator including a stator core disposed at a gap from the rotor, and a coil provided to the stator core. The stator core includes a stator yoke portion having a substantially annular shape, stator teeth portions provided along a circumferential direction and protruding radially from the stator yoke portion, and slot portions formed between adjacent stator teeth portions. The coil is inserted into each slot portion of the stator core and includes a coil end portion protruding in an axial direction from a stator core end surface. A refrigerant is discharged radially outward of the rotor. A refrigerant guide unit for guiding the refrigerant discharged radially outward in a protruding direction of the coil end portion is disposed on the stator core end surface.