Stator Base Plate Cooling Grooves for Electric Rotary Machines
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Solution Overview
Problem
The existing methods for cooling stator coils in electric rotary machines, such as supplying refrigerant from above, often fail to reach coils located below, leading to local temperature rises and performance deterioration.
Innovation Solution
A stator design with a base plate having communication portions and grooves on its outer and inner surfaces, which guides refrigerant to connection coils, ensuring efficient cooling of both sides of the base plate and preventing local temperature rises by allowing refrigerant to reach coils below.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If refrigerant is supplied from above the coil end, then the cooling method is simple, but the refrigerant cannot reach the coil located below causing local temperature rise
Solution Approach 1:
The invention introduces a communication portion that enables refrigerant flow in a radial direction (from outer circumferential surface toward center) in addition to the axial direction, creating a two-dimensional cooling pathway. This allows refrigerant to reach coils at different radial positions effectively, solving the temperature uniformity issue while maintaining manufacturing simplicity
Solution Approach 2:
The communication portion acts as an intermediary channel that connects the outer circumferential surface to the connection coil accommodating groove. It mediates the refrigerant flow path, enabling the refrigerant to reach previously inaccessible areas without complicating the overall cooling system structure
2Stability of the object's composition
If connection coils are disposed in the base plate, then the bridge portions are properly formed, but the coils are difficult to cool effectively
Solution Approach 1:
The base plate is segmented with multiple grooves (outer surface groove and inner surface groove) that separately accommodate different connection coils. This segmentation allows independent cooling pathways for each groove, enabling effective heat dissipation while maintaining the structural integrity and proper formation of bridge portions
3Stability of the object's composition
If the base plate has grooves for connection coils, then the connection coils are properly accommodated, but the refrigerant cannot reach inside the grooves
Solution Approach 1:
The communication portion serves as an intermediary that bridges the outer circumferential surface and the connection coil accommodating groove. It enables refrigerant to penetrate into the groove structure and reach the connection coils for effective cooling, while the groove structure itself remains intact for proper coil accommodation
Solution Approach 2:
The communication portion is strategically positioned at specific locations on the base plate to provide localized refrigerant access to the grooves. This local quality enhancement ensures that refrigerant flow is directed precisely where needed (into the grooves) without compromising the overall structural stability and coil accommodation functionality
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 design effectively suppresses local temperature rises and maintains the performance of electric rotary machines by ensuring uniform cooling of connection coils on both sides of the stator core.
Implementation Method 1
a communication portion (135) is provided on an outer circumferential surface of the base plate for communicating with the connection coil accommodating groove
Implementation Method 2
supplying refrigerant from the above of the coil end toward the coil end
Data Source
AI summary
A stator for an electric rotary machine includes: a stator core which has plural slots; and segmented coils of a plurality of phases, wherein: the stator core is provided with a base plate at least one side thereof in an axial direction; the segmented coils of the plurality of phases include plural slot coils which are individually disposed in the plural slots of the stator core and which extend substantially linearly, and plural connection coils which are individually disposed in the base plate and which make up bridge portions by connecting the slot coils of a same phase together; the connection coil is accommodated in a connection coil accommodating groove formed on a front surface of the base plate; and the base plate is provided with a communication portion on an outer circumferential surface thereof for communicating with the connection coil accommodating groove.