Double Spiral Cooling Jacket for Electric Motor Stators
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Solution Overview
Problem
Existing cooling systems for electric motors, particularly stators, lose radial installation space due to axial routing of coolant lines, limiting the utilization of annular installation space and requiring additional space for feed lines, which complicates cooling efficiency and accessibility.
Innovation Solution
A cooling jacket with a double spiral design, featuring a first spiral line for feed flow and a second spiral line for return flow, forming an axially integrated double spiral around a common spiral axis, allowing for efficient heat absorption and distribution while minimizing radial space usage, and incorporating a deflection unit to manage coolant flow and reduce installation space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant lines are routed axially from inflow or outlet, then cooling function is achieved, but radial installation space is lost and annular installation space cannot be fully utilized
Solution Approach 1:
The coolant lines are transformed from axial routing to spiral routing around the stator. The first and second coolant lines form spiral paths in the circumferential direction, allowing coolant to be distributed to multiple locations radially while maintaining axial inlet/outlet connections. This dimensional transformation enables full utilization of annular installation space without sacrificing cooling effectiveness.
2Temperature
If dedicated feed lines are used for coolant supply, then cooling is provided, but additional space is required and routing complexity increases
Solution Approach 1:
The first and second coolant lines are merged into a unified spiral cooling system with common inlet and outlet connections. Both coolant lines receive coolant from the same inlet and discharge to the same outlet, eliminating the need for separate dedicated feed lines. This merging reduces routing complexity while maintaining effective cooling across the stator surface.
3Temperature
If coolant lines are routed closer to rim or through coils, then cooling coverage is improved, but installation space utilization deteriorates or new problems arise
Solution Approach 1:
The spiral coolant lines are positioned at optimized radial distances from the stator center, creating local cooling zones that uniformly cover the stator surface. The lines follow spiral paths that maintain appropriate spacing from both the center and rim, ensuring adequate cooling coverage without encroaching on critical installation spaces. This localized optimization allows flexible positioning based on thermal requirements.
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 double spiral design ensures uniform cooling with reduced temperature gradients, minimizing the need for multiple sensors and optimizing coolant flow, thus reducing cooling power expenditure and saving installation space, while allowing axial access for coolant supply, enhancing cooling efficiency and motor performance.
Implementation Method 1
the waste heat from the electric motor is absorbed and transported away by coolant which flows in a first line
Implementation Method 2
the waste heat from the electric motor is absorbed and transported away by coolant which flows in a first line
Data Source
AI summary
A cooling jacket (14) for cooling an electric motor, in particular a stator (23), wherein a first spiral line (16) for transporting a coolant is formed at least partially on the cooling jacket (14). The aim of the invention is to provide a cooling system that is optimized in terms of mounting space and ensures axially equalized cooling. This aim is achieved in that a second spiral line (17) for transporting coolant is formed at least partially, and in that based on a common spiral axis R, both spiral lines (16, 17) form an axially integrated double spiral, wherein the first spiral line (16) is an inflow line and the second spiral line (17) is a return flow line. The invention further relates to a deflection unit (12) for the return into the second line (17), which substantially prevents the static pressure from dropping.