Electric Rotary Machine Cooling With Tangential Fluid Distribution
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Solution Overview
Problem
Existing electric rotary machines in motor vehicles face challenges in achieving uniform and efficient cooling, particularly when the machine is stationary, leading to potential overheating and complex fluid distribution designs.
Innovation Solution
The electric rotary machine incorporates a statically fixed fluid supply device connected to a rotating distribution element. The fluid supply device has a flow channel with an outlet directing the cooling fluid tangentially against the distribution element, causing it to rotate and distribute the cooling fluid around the axis of rotation, ensuring large-area cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a distribution device is connected to a rotating component to use centrifugal force for distributing cooling oil, then cooling distribution is improved during rotation, but cooling is insufficient when the machine is stationary and the design becomes complex
Solution Approach 1:
The distribution device is segmented into a stationary fluid supply device and a rotatable distribution element that can be independently activated. The distribution element is divided into multiple spray nozzles arranged to cover different areas, allowing targeted cooling distribution without requiring complex rotating mechanisms for the entire system.
Solution Approach 2:
The distribution element is designed to be rotatable and can be dynamically activated or deactivated independent of the rotor's rotation. This dynamic capability allows the system to provide cooling distribution during both stationary and rotating states, eliminating the limitation of centrifugal force-dependent designs while maintaining simplicity.
2Temperature
If multiple nozzles are distributed around the circumference to ensure uniform cooling, then cooling uniformity is improved, but device complexity and cost increase
Solution Approach 1:
Multiple spray nozzles are integrated into a single rotatable distribution element rather than being fixed as separate stationary components. This merging reduces the overall system complexity while maintaining uniform cooling coverage, as the rotating element naturally distributes coolant across all required areas during rotation.
Solution Approach 2:
The rotatable distribution element serves multiple functions: it acts as both the mounting structure for multiple nozzles and the rotating mechanism itself. This multi-functionality eliminates the need for separate drive mechanisms for each nozzle, reducing device complexity and cost while achieving uniform cooling distribution.
3Temperature
If centrifugal cooling is used, then cooling is effective during rotation, but cooling only occurs at certain points when stationary leading to local overheating
Solution Approach 1:
The distribution element utilizes the rotor's rotation to drive its own rotation through hydrodynamic coupling, eliminating the need for an external drive mechanism. This self-service approach ensures that the distribution element rotates in sync with the rotor, providing continuous cooling coverage during rotation and preventing local overheating while maintaining system simplicity.
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 solution provides a speed-independent and large-area cooling option for electric rotary machines, ensuring efficient heat dissipation across the machine's components, even when stationary, in a structurally simple and cost-effective manner.
Implementation Method 1
The outlet and the distribution element are arranged and configured such that the cooling fluid volume flow is directed to a partial circumference of the distribution element
Implementation Method 2
The distribution element can be set in rotation as a result of the incident flow, as a result of which the cooling fluid can be distributed around the axis of rotation of the distribution element, the cooling fluid being carried along by the distribution element
Data Source
AI summary
An electric rotary machine and a drive arrangement for a motor vehicle. The electric rotary machine having a rotor that rotates about an axis of rotation, a stator, a fluid supply device arranged statically fixed and a distribution element fluidically connected to the fluid supply device and rotatable relative thereto. The fluid supply device has a flow channel with an outlet for discharging cooling fluid in an outlet direction, and an axis of rotation of the distribution element is arranged such that the outlet direction runs tangentially to a circumference of the distribution element so the cooling fluid exiting the outlet can flow tangentially against the distribution element which can be set in rotation based on the incident flow, so the cooling fluid can be distributed around the axis of rotation. Large-area cooling is achieved in a structurally simple manner.