Self-Ventilated Rotary Machine Cooling With Retrofit Air Guides
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Solution Overview
Problem
Existing electrodynamic rotary machines suffer from inefficient cooling due to cooling air escaping radially from housing fins, leading to increased temperature gradients and reduced operational efficiency, necessitating larger machine designs and thermal stress on components.
Innovation Solution
A self-ventilated electrodynamic rotary machine design featuring a cover with air guide elements that direct cooling air along the housing at an angle, supplemented by additional cooling air flows generated from outside, enhancing dwell time and cooling effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is directed axially along housing fins from ventilation side to drive side, then cooling coverage is extended, but cooling air escapes radially and loses cooling function
Solution Approach 1:
The patent introduces a second air flow dimension by injecting cooling air radially inward from the housing outer surface toward the machine axis. This supplements the primary axial air flow, creating a two-dimensional cooling pattern that prevents radial escape of cooling air and enhances heat removal efficiency from the housing fins.
2Volume of moving object
If machine size is reduced, then compactness is improved, but cooling effectiveness deteriorates due to insufficient cooling air
Solution Approach 1:
The patent employs pneumatic principles by introducing an additional air flow through injection holes in the housing. This secondary air flow system supplements the primary fan-driven axial flow, enabling effective cooling in a more compact machine configuration without requiring excessive housing volume or extended fin lengths.
3Temperature
If forced ventilation is used, then cooling effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service cooling system where the machine's own operation drives the ventilation process. The rotating shaft directly drives the fan, which generates the primary air flow, and the housing structure itself provides the injection holes for secondary air flow. This eliminates the need for external cooling systems or additional control mechanisms, maintaining simplicity while achieving forced ventilation effectiveness.
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 design significantly improves cooling efficiency by reducing temperature gradients and extending the cooling effect to the drive side, increasing operational efficiency and extending the service life of windings and bearings.
Implementation Method 1
a fan 2 non-rotatably connected to the shaft 9 and generating a main air flow 7 when the shaft rotates about an axis, wherein the fan is provided with a cover 3 which directs the main cooling air flow 7 generated by the fan onto the housing 6
Implementation Method 2
The air guide element has openings that are formed between axially extending ridges and air guide surfaces disposed therebetween. During operation of the fan, the main cooling air flow is supplemented by fresh air drawn in radially from the outside according to the injector principle
Implementation Method 3
This cooler air, coming from the outside, is preferably conveyed at an oblique angle onto the surface of the housing, in particular to the base of the cooling fins
Data Source
AI summary
A self-ventilated electrodynamic rotary machine includes a housing configured to at least partially axially enclose the rotary machine, and a fan connected in a rotationally fixed manner to a shaft on a ventilation side of the rotary machine and configured to generate a main cooling air flow when the shaft rotates about an axis. The fan includes a cover which is configured to direct the main cooling air flow onto the housing and is structured to improve cooling of the housing. An air guide element is detachably fixed to the cover to generate an additional cooling air flow. The air guide element, when viewed in a circumferential direction, has a segmented design and is configured as separate part for retrofitting to the cover depending on a thermal requirement of the rotary machine.