Electric Machine Air Deflector for Clean Rotor-Stator Cooling
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Solution Overview
Problem
Rotating electrical machines face overheating issues due to dust and contaminants in external air entering through ventilation systems, which can damage internal components and disrupt airflow, leading to thermal instability.
Innovation Solution
A rotating electrical machine design featuring a deflector at the air inlet that separates the airflow into two streams, bypassing the connection heads and ensuring they are protected from contaminants, while maintaining thermal stability by controlling airflow distribution between rotor and stator ventilation ducts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an air inlet opening is provided in the casing to allow fresh air entry for cooling, then the rotating electrical machine can be cooled effectively, but dust and contaminants from outside air can enter and damage internal components such as the winding connection heads
Solution Approach 1:
A deflector is introduced as an intermediary component between the air inlet opening and the connection heads. The deflector redirects the incoming air flow to bypass the connection heads, allowing cooling air to reach the ventilation ducts while preventing direct contact between contaminants and the connection heads, thus resolving the contradiction between effective cooling and contamination protection
2Ease of operation
If connection heads are located near the air inlet for ease of connection, then electrical circuit connection is simplified, but the irregular geometry of connection heads disrupts air flow and causes significant pressure losses
Solution Approach 1:
The deflector acts as a mediator that separates the air flow path from the connection heads. It guides the air flow along a path that bypasses the connection heads, eliminating the flow disruption caused by their irregular geometry while maintaining their accessible location for easy connection operations
3Ease of operation
If connection heads are located near the air inlet opening, then they are easily accessible for connection, but this location exposes them directly to incoming air flow carrying contaminants
Solution Approach 1:
The deflector is positioned to create a protective barrier between the air inlet and the connection heads. It redirects the air flow to pass by rather than through the connection heads area, maintaining their accessibility for connections while shielding them from the direct path of contaminant-laden air
4Temperature
If air flow is allowed to circulate freely through the cavity to cool the machine, then thermal stability is improved, but contaminants in the air can infiltrate and damage the winding
Solution Approach 1:
The deflector serves as a protective intermediary that redirects air flow to bypass vulnerable areas. It guides the cooling air toward the ventilation ducts while preventing direct infiltration into weak areas of the winding such as connection heads, thus maintaining thermal stability while reducing contamination risk
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 deflector effectively protects the connection heads from dust and contaminants, promotes laminar airflow, and enhances thermal stability by reducing pressure losses and airflow noise, thus ensuring efficient cooling and prolonged machine lifespan.
Implementation Method 1
a deflector configured to divide the air flow entering the cavity through the air inlet into a first air flow flowing toward the first ventilation ducts and a second air flow flowing toward the second ventilation ducts
Implementation Method 2
at least one ventilation duct intended to cool the rotor and at least one ventilation duct intended to cool the stator
Data Source
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AI summary
The invention relates to a rotating electrical machine comprising: - a rotor (26); - a stator (28) having a plurality of connection heads (42) located in a cavity (48); - an air ventilation system (30) comprising an air inlet (50) for the entry of an airflow, the first ventilation ducts (52) of the rotor (26) and the second ventilation ducts (54) of the stator (28); and - a deflector (32) configured to divide the airflow entering the cavity (48) through the air inlet (50) into a first airflow flowing towards the first ventilation ducts (52) and a second airflow flowing towards the second ventilation ducts (54), the deflector (32) being configured such that the first airflow and the second airflow bypass the connection heads (42).