Venturi Cooling Apparatus for Electric Machine Cover
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Solution Overview
Problem
Conventional cooling methods for electric machines, such as totally-enclosed fan-cooled motors, suffer from temperature gradients that restrict motor operation and maximum achievable rating due to limited air circulation and inefficient heat dissipation.
Innovation Solution
A cooling apparatus utilizing the Venturi effect is integrated with the electric machine's cover, where air is guided between fins to increase velocity and mix with fresh air, enhancing cooling by creating an opening that allows ambient air to enter and combine with air from the fan, thereby reducing the mixed air temperature and improving heat removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling methods are used with external fans blowing air over the motor body surface, then the motor can be cooled, but temperature gradients from fan end to exit end occur which restrict motor operation and maximum achievable rating
Solution Approach 1:
The cooling apparatus segments the air cooling process into multiple zones: fresh air intake zone, mixed air zone, and outlet zone. The cover is divided into a body portion and a cooling apparatus portion, with the cooling apparatus including a plenum chamber and outlet. This segmentation allows different regions to perform specialized functions, reducing temperature gradients and improving overall cooling efficiency.
Solution Approach 2:
The invention applies local quality by creating a dedicated cooling apparatus with specific structural features at critical locations. The plenum chamber is positioned to receive air from specific directions, and the outlet is strategically located to maximize cooling effect. The body portion has a specific geometry (including angled surfaces) designed to optimize air flow distribution locally, ensuring uniform cooling across the motor.
2Temperature
If air is blown over the motor body surface to cool it, then cooling is achieved, but the cooling efficiency is insufficient to enhance motor performance and maximum rating
Solution Approach 1:
The invention utilizes pneumatic principles by designing a cover-integrated cooling apparatus that manipulates air flow through pressure differentials and velocity changes. The body portion's angled surfaces and the plenum chamber configuration create specific air flow patterns that enhance convective heat transfer. The outlet geometry is designed to optimize the pneumatic delivery of cooled air to the motor windings, significantly improving cooling efficiency and enabling higher motor performance.
3Temperature
If the cover is modified to include cooling apparatus with body portion and opening, then fresh air can be introduced and mixed with fan air to reduce temperature, but the device complexity increases
Solution Approach 1:
The invention merges the cooling apparatus directly into the motor cover structure, eliminating the need for separate external cooling components. The body portion, cooling apparatus portion, plenum chamber, and outlet are all integrated into the cover as a unified structure. This merging approach reduces the number of separate parts, simplifies assembly, and lowers overall device complexity while achieving effective cooling through fresh air introduction and mixing.
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 solution effectively reduces the air temperature at the outlet, optimizing the motor's rating and improving its reliability by increasing the volume of air guided to the outlet, thus enhancing the cooling process and performance of the electric machine.
Implementation Method 1
the present invention relates to a cooling apparatus to further enhance cooling and performance of the electric machine utilizing a Venturi effect
Data Source
AI summary
Provided is a cooling apparatus for an electric machine that is integrally combined with the cover of the electric machine and includes a body portion around the circumference of an external surface of the cover that has a first part which is formed at a first angle in a direction away from the cover, and a second part which is formed in a second angle in a downward direction which is opposite the direction of the first part, wherein the first part and the second part form an opening therebetween. The body portion is formed above a plurality of fins attached to a frame of the electric machine, wherein the fresh air is introduced into the fins and mixes with air from an air inlet end and exits through an air outlet end at the opposite end of each fin of the plurality of fins.