Two-Zone Fan Cooling Layout for Compact Drive Units
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Solution Overview
Problem
Existing drive units face challenges in achieving sufficient cooling, leading to heat accumulation and reduced performance, especially in compact designs where traditional cooling methods are inadequate.
Innovation Solution
A compact drive unit design featuring a dynamoelectric machine, an electronic add-on part, and a two-zone fan, where the electronic add-on part is positioned between the dynamoelectric machine and the fan, utilizing the Venturi effect to generate cooling air flows through strategically placed free spaces and surface structures, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional cooling methods are used in compact drive units, then the drive unit size can be reduced, but heat accumulation occurs and cooling efficiency deteriorates
Solution Approach 1:
The fan is divided into two distinct zones: a first zone with first fan blades generating axial air flow, and a second zone with second fan blades generating radial air flow. This segmentation allows different regions of the drive unit to be cooled by appropriately directed air flows, effectively removing heat from compact components without increasing overall drive unit size.
Solution Approach 2:
The invention introduces radial air flow as an additional cooling dimension complementing the traditional axial air flow. The second zone of the fan generates radial air flow that directs cooling air into side regions and free spaces of the drive unit, creating a three-dimensional cooling pattern that enhances heat dissipation efficiency within the compact volume.
2Device complexity
If electronic add-on parts are positioned between the dynamoelectric machine and fan, then compact arrangement is achieved, but cooling effectiveness may be compromised
Solution Approach 1:
Different regions of the drive unit are provided with tailored cooling approaches: the first zone supplies axial cooling to the dynamoelectric machine, while the second zone supplies radial cooling to the electronic add-on parts and surrounding free spaces. This local differentiation ensures that each component receives appropriate cooling despite the compact axial arrangement.
Solution Approach 2:
The cooling system is segmented into two functional zones with distinct air flow patterns. The first zone focuses cooling on the dynamoelectric machine through axial flow, while the second zone targets the electronic add-on parts and intercomponent free spaces through radial flow, ensuring effective thermal management of all components in the compact arrangement.
3Device complexity
If a single fan zone is used, then device simplicity is maintained, but cooling coverage is insufficient for compact designs
Solution Approach 1:
The fan is segmented into two functional zones with different blade configurations and air flow characteristics. The first zone generates axial air flow for primary cooling, while the second zone generates radial air flow to extend cooling coverage into side regions and free spaces, effectively increasing the total cooled area without proportionally increasing fan size.
Solution Approach 2:
The invention adds radial air flow as a second dimension of cooling coverage alongside the traditional axial flow. This two-dimensional cooling approach allows the fan to effectively cool a larger volume and surface area of components within the compact drive unit, including regions that would be inaccessible to axial flow alone.
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 ensures effective heat dissipation, preventing heat accumulation and allowing for a more compact, high-performance drive unit with improved thermal management, even during alternating operating states.
Implementation Method 1
utilizing the Venturi effect to generate cooling air flows through strategically placed free spaces and surface structures, enhancing cooling efficiency
Implementation Method 2
the fan unit is embodied as a two-zone fan that is connected in a non-rotating manner to a shaft. Consequently, two air flows that run independently of one another are generated during the operation of the dynamoelectric rotational machine
Data Source
AI summary
A drive includes a dynamoelectric rotational machine, an electronic add-on part, and a fan unit arranged axially behind one another. The fan unit generates a cooling air flow and is embodied as a two-zone fan having axial fan elements which define a first zone to generate essentially an axial air flow and include an articulated joint with an elastic region with sufficient restoring force, and radial fan blades which define a second zone that radially adjoins the first zone and generate essentially a radial air flow. Free spaces are provided at least between a housing arrangement and the fan unit and/or between the housing arrangement and a bearing shield of the dynamoelectric rotational machine and/or between the housing arrangement and/or a shaft of the dynamoelectric rotational machine, with the free spaces being acted upon during operation of the fan unit by the cooling air flow and a Venturi effect.