Stator Cooling Device with Segmented Flow for Uniform Heat Removal
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Solution Overview
Problem
The existing stator cooling devices with a fixed portion can lead to uneven cooling of the stator main body as the cooling medium flow is blocked by the fixed portion, preventing it from reaching the outer peripheral portions lower than the fixed portion.
Innovation Solution
The stator cooling device is designed with a fixed portion positioned above a horizontal plane and a peak portion displaced from a vertical plane, featuring an injection hole that opens towards the fixed portion, allowing the cooling medium to directly impact and flow over it, ensuring even cooling of the outer peripheral regions. Additionally, the injection hole is angled to facilitate flow past the fixed portion, and multiple injection points are used to cover the entire outer peripheral area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the fixed portion is provided on the stator main body to fix it to the housing case, then the stator main body is firmly fixed, but the cooling medium flow is blocked by the fixed portion, causing uneven cooling
Solution Approach 1:
The cooling medium flow passage is divided into multiple segments: a first flow passage that supplies cooling medium to the upper portion of the stator main body, and a second flow passage that supplies cooling medium to the lower portion. This segmentation allows cooling medium to reach both regions above and below the fixed portion, ensuring uniform cooling while maintaining the fixing function.
Solution Approach 2:
A partition wall is introduced as an intermediary structure that separates the first and second cooling medium flow passages. The partition wall extends from the outer peripheral surface of the stator main body toward the inner peripheral surface, creating distinct flow paths that allow cooling medium to be delivered to different regions without interfering with the fixed portion's blocking effect.
2Ease of manufacture
If the cooling medium is supplied through a downward hole to flow downward along the outer peripheral portion, then the cooling medium flows by gravity, but the flow is blocked by the fixed portion, preventing it from reaching lower outer peripheral portions
Solution Approach 1:
The cooling medium supply system is segmented into two independent flow passages: a first flow passage with a downward hole for supplying cooling medium to the upper region, and a second flow passage for supplying cooling medium to the lower region. This ensures comprehensive cooling coverage while maintaining manufacturing simplicity.
Solution Approach 2:
The cooling medium supply approach is changed from a single vertical dimension (downward hole only) to include both vertical and radial dimensions. The first flow passage uses vertical downward flow, while the second flow passage uses radial flow along the outer peripheral surface, allowing cooling medium to reach areas blocked by the fixed portion.
3Temperature
If the injection hole opens toward the fixed portion to allow cooling medium to pass over it, then the cooling medium can reach lower portions, but the device height increases
Solution Approach 1:
The cooling medium delivery system is segmented into two separate flow passages with different orientations and locations. The first flow passage delivers cooling medium to the upper portion, while the second flow passage delivers cooling medium to the lower portion. This segmentation eliminates the need for a tall injection hole opening toward the fixed portion, maintaining compact device height.
Solution Approach 2:
The cooling medium delivery mechanism transitions from a purely vertical arrangement (requiring significant height) to a combined vertical and radial arrangement. The second flow passage delivers cooling medium radially along the outer peripheral surface, reducing the vertical height requirement while improving cooling coverage.
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 reduces the vertical height of the cooling device, makes it more compact, and ensures uniform cooling of the stator main body by allowing the cooling medium to reach and cool all outer peripheral regions, preventing uneven cooling.
Implementation Method 1
a cooling medium is supplied to the stator core through a downward hole that opens vertically downward in the cooling medium flow passage such that the cooling medium falls by the force of gravity to flow downward along an outer peripheral portion of the stator core
Implementation Method 2
the cooling medium falls by the force of gravity to flow downward along an outer peripheral portion of the stator core
Data Source
AI summary
A stator cooling device configured with a cylindrical stator main body that uses a rotation axis of a rotary electric machine as a central axis. A fixed portion is formed on an outer peripheral portion of the stator main body so as to protrude outward in a radial direction of the stator main body. A cooling medium flow passage includes an injection hole through which cooling medium is injected. The fixed portion is configured above a horizontal plane that passes through the central axis, and a peak portion that is farthest in the fixed portion from the central axis as viewed in an axial direction of the central axis. The injection hole opens toward the fixed portion above the outer peripheral portion of the stator and toward the first vertical plane side with respect to a second vertical plane that is a vertical plane that passes through the peak portion.