Stator Core Cooling Channels That Preserve Motor Torque
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Solution Overview
Problem
Conventional cooling methods for stator coils in rotating electric machines, such as dripping a cooling medium onto the outer peripheral surface, fail to ensure sufficient cooling performance, leading to inefficiencies and torque loss due to the obstruction of magnetic flux paths by cooling medium flow paths.
Innovation Solution
The design incorporates a stator core with alternating first and second flow paths in each core block, arranged to communicate with each other, allowing for efficient cooling medium flow through the core blocks and directly to the stator coil, while minimizing torque loss by optimizing the position of cooling medium flow paths relative to the magnetic flux paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling medium flow paths are provided in the stator core, then cooling performance is improved, but torque loss occurs due to obstruction of magnetic flux paths
Solution Approach 1:
The stator core is divided into multiple core blocks arranged in the axial direction. Each core block contains multiple flow paths arranged in the circumferential direction, creating a segmented cooling structure that allows cooling medium to reach different radial positions without obstructing magnetic flux paths uniformly across the entire core
Solution Approach 2:
Flow paths are selectively provided at specific radial positions within each core block based on local cooling requirements. The alternating arrangement of first and second flow paths ensures that cooling is applied where heat generation is highest while leaving other regions intact for optimal magnetic flux passage
2Temperature
If cooling medium is dripped onto the outer peripheral surface of the stator core, then cooling is provided, but sufficient cooling performance of the coil cannot be ensured
Solution Approach 1:
The cooling approach transitions from surface-level dripping on the outer peripheral surface to internal flow paths that penetrate through the core blocks in the axial direction. This dimensional shift allows cooling medium to reach the coil end parts and internal regions directly, ensuring sufficient cooling performance
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 enhances cooling performance of both the stator core and coil while maintaining or improving torque efficiency by ensuring effective heat dissipation and reducing torque reduction associated with cooling medium flow paths.
Implementation Method 1
cooling the stator coil by dripping cooling medium from above the stator core
Implementation Method 2
the cooling medium that is dripped onto the outer peripheral surface of the stator core and flows down along the outer peripheral surface flows in the axial direction of the stator
Data Source
AI summary
A rotating electric machine including a rotor and a stator. The stator includes a stator core having a first and second core blocks arranged adjacent to each other and coils disposed in slots. Each of the first and second core blocks is configured so that first flow paths and second flow pats penetrating the first and second core blocks are provided in circumferential direction, each of the first flow paths and each of the second flow paths are arranged alternately every predetermined angle in the circumferential direction, and the first and second core blocks are arranged so that the first flow paths of the first core block and the second flow paths of the second core block communicate with each other and the second flow paths of the first core block and the first flow paths of the second core block communicate with each other.