Blower Motor Mount Projecting Elements for Tonal Noise Damping
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Solution Overview
Problem
Air-conditioning system blowers in motor vehicles produce bothersome tonal noise during operation, which existing designs fail to adequately address.
Innovation Solution
A blower motor mount with a first surface featuring projecting elements around its circumference, designed to disturb and dampen air flow between the impeller and the motor mount, reducing tonal noise components by creating a disturbance in the air flow through the gap between the impeller and the motor mount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a smooth motor mount surface is used, then the structure is simple and manufacturing is easy, but tonal noise components are not damped and bothersome noise occurs
Solution Approach 1:
The motor mount surface is equipped with projecting elements at specific locations where air flow disturbance is needed for noise damping, while other areas maintain their original simple structure. This localized modification approach reduces tonal noise without significantly increasing overall device complexity
Solution Approach 2:
The projecting elements act as intermediary structures between the motor mount and the air flow, creating turbulence that dampens tonal noise components. These elements serve as a mediator that transforms smooth air flow into disturbed flow patterns that reduce noise
2Object-affected harmful factors
If projecting elements are added to the motor mount, then tonal noise is damped, but manufacturing complexity increases
Solution Approach 1:
The projecting elements are integrated into the motor mount as a unified structure, combining the motor mount function with the noise-damping feature in a single component. This merging approach avoids the need for separate noise-damping attachments and simplifies the manufacturing process
Solution Approach 2:
The projecting elements can be manufactured using standard molding or machining parameters, where the height, diameter, and distribution of the elements can be adjusted as design parameters without fundamentally changing the manufacturing process. This allows for easy optimization of noise damping performance while maintaining ease of manufacture
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 effectively impairs and damps tonal noise components, providing a quieter operation for the blower by disturbing air flow through the strategic arrangement and design of projecting elements on the motor mount surfaces.
Implementation Method 1
air flowing through the gap between the impeller and the motor mount is disturbed by the projecting elements in such a way that tonal noise components occurring elsewhere are impaired and damped
Data Source
AI summary
A blower having a motor mount, in particular for a blower of an air-conditioning system of a motor vehicle, the blower having a blower housing, in which an electric motor is held with the aid of the motor mount, an impeller being furthermore drivably disposed in the blower housing on a shaft of the electric motor, the impeller having a side oriented toward the electric motor, and the motor mount having a first surface oriented toward the impeller, a gap being formed between the impeller and the first surface, the first surface having a plurality of first projecting elements, which protect on the outer circumference of the surface in the direction of the impeller.