Liquid-Cooled Motor With Nested Cooling Tubes
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Solution Overview
Problem
Permanent magnet motors in liquid-cooled systems face overheating issues due to the need for efficient cooling, and existing liquid-cooled motor designs may not effectively manage cooling liquid circulation without interfering with the magnetic path, requiring a more efficient cooling system.
Innovation Solution
A liquid-cooled motor design featuring a motor case, internal and external tubes for cooling liquid flow, and a supporting member with sealing members and an air chamber to facilitate communication between the tubes, allowing for effective cooling while maintaining the integrity of the magnetic path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a liquid cooling system is implemented in a permanent magnet motor, then cooling efficiency is improved, but the magnetic path may be interfered with and device complexity increases
Solution Approach 1:
The cooling liquid passage is formed by nesting the inner circumferential surface of the motor case and the outer circumferential surface of the stator, creating a cooling channel within the existing motor structure without adding external cooling components. This nested approach provides effective cooling while maintaining compact design and avoiding interference with the magnetic path.
Solution Approach 2:
The motor case serves multiple functions: it provides structural support, forms part of the magnetic path, and creates the cooling liquid passage when fitted to the stator. This multi-functionality reduces the need for separate cooling components, thereby reducing device complexity while maintaining effective cooling.
2Reliability
If the motor case width is increased to cover the stator winding end portions, then the stator winding is protected, but the overall motor size increases
Solution Approach 1:
The motor case is designed to simultaneously cover the end portions of the stator winding and form the cooling liquid passage. By merging these two functions into a single component design, the motor case provides protection without requiring additional protective structures that would increase motor size.
Solution Approach 2:
The motor case width is increased only at the specific location where the stator winding end portions are located, rather than uniformly increasing the entire motor case dimensions. This localized approach provides necessary protection while minimizing the overall motor size increase.
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 enhances cooling efficiency by allowing for even distribution of cooling liquid around the stator and motor case without interfering with the magnetic path, effectively preventing overheating and ensuring reliable operation.
Implementation Method 1
a cooling liquid passage formed between the outer circumferential surface of the stator and the inner circumferential surface of the motor case
Implementation Method 2
a liquid-cooled motor configured to cool the stator and the motor case evenly in the circumferential direction
Data Source
AI summary
A liquid-cooled motor includes a motor arranged inside a motor case; an internal tube arranged inside the motor case; an external tube arranged outside the motor case; and a supporting member fixed to the motor case to support the internal tube and the external tube and to allow the internal tube and the external tube to be communicated with each other. The supporting member includes a first supporting portion arranged to the motor case side to support the internal tube; and a second supporting portion arranged to another side opposite to the motor case side to support the external tube. The first supporting portion includes sealing members arranged along an outer circumference surface of the internal tube; an air chamber arranged between the sealing members; and a water draining portion allowing the air chamber and an outside portion of the motor case to be communicated with each other.