BLDC Blower Motor Cover Sealing for Moisture and Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Blower motors in vehicle air conditioning systems face issues with moisture penetration, air leakage, and vibration/noise generation due to the existing structures, which can lead to electrical component failure and discomfort.
Innovation Solution
A blower motor design featuring a novel motor cover with a cup-shaped cover part and a packing part, including a water sealing part, decoupling damper part, and air sealing part, which are integrated to prevent moisture, air leakage, and vibration/noise by using a flange with a damper seating part and a damper plate to secure the motor assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional motor cover structure is used, then the motor can operate, but moisture can penetrate into the motor and cause electrical component failure
Solution Approach 1:
The patent employs a packing part made of flexible material (such as rubber or elastomer) that forms a sealing membrane between the motor cover and the housing. This flexible sealing film prevents moisture penetration while accommodating thermal expansion and contraction of the motor components during operation, thereby protecting electrical components without compromising reliability.
Solution Approach 2:
The packing part is nested within the motor cover structure, with the sealing membrane integrated into the cover assembly. The packing part is positioned between the motor cover and the housing, creating a nested configuration where the sealing function is embedded within the overall motor structure, providing moisture protection while maintaining compact design.
2Stability of the object's composition
If the housing and flange are fitted in contact to secure the motor, then the motor is firmly mounted, but air leakage occurs between the motor and flange causing noise
Solution Approach 1:
The patent introduces an air sealing part made of flexible material that prevents air leakage between the housing and the flange. This flexible sealing element maintains the mounting stability of the motor while blocking the passage of air that would otherwise escape through the gap, thereby eliminating noise without compromising the firm mounting of the motor assembly.
3Device complexity
If the motor housing is directly coupled to the flange, then the structure is simple, but vibration generated during motor operation is transmitted to the flange and installation portion
Solution Approach 1:
The patent introduces a decoupling damper part as an intermediary element between the motor housing and the flange. This damper component serves as a mediator that absorbs and isolates vibration generated during motor operation, preventing its transmission to the flange and installation portion. The decoupling damper part maintains the structural coupling while reducing harmful vibrations, thus adding minimal complexity to achieve vibration mitigation.
4Reliability
If a sealing structure is added to prevent moisture penetration, then electrical components are protected, but the motor cover structure becomes more complex
Solution Approach 1:
The patent merges the sealing function with the motor cover structure by integrating the packing part and air sealing part directly into the cover assembly. The sealing components are combined with the cover in a unified structure, eliminating the need for separate sealing assemblies and reducing overall structural complexity while maintaining effective protection of electrical components against moisture.
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
Effectively prevents moisture penetration, air leakage, and reduces noise and vibration during operation, thereby protecting electrical components and enhancing the operational reliability and comfort of the blower motor.
Implementation Method 1
a packing part 51 enclosing a periphery of the cover part 50
Implementation Method 2
a decoupling damper part 513 formed to enclose a decoupling part 503
Implementation Method 3
an air sealing part 515 formed to cover a side surface 502B and a lower surface 502C of the rim part 502
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The blower motor according to the present invention comprises a motor assembly 100 comprising a stator assembly 1 comprising a stator core 10, an upper insulator 11 coupled to an upper portion of the stator core 10 and a lower insulator 12 coupled to a lower portion of the stator core 10; a rotor assembly 2 rotating around the stator assembly 1; a stator block 3 to which the stator assembly 1 is coupled; a printed circuit board 4 located at a lower portion of the stator block 3; and a motor cover 5 coupled to the stator block 3; a flange 200 comprising a flange body 201 having a hole in the center into which the motor assembly 100 is inserted, an upper protrusion 202 having an annular shape protruding upwardly along a periphery of the hole into which the motor assembly 100 is inserted, a damper seating part 203 formed in the shape of a groove on an inner side of the hole of the motor assembly 100, and a plurality of coupling protrusions 204 formed in the shape of protrusions on a lower portion of the flange body 201; and a damper plate 300 comprising an annular body 301 having a ring shape, a plurality of locking parts 302 protruding upwardly from a periphery of the annular body 301 at regular intervals, and a plurality of protrusion guides 303 protruding toward the shaft 21 from a periphery of the annular body 301 at regular intervals, wherein the motor cover 5 comprises a cover part 50 and a packing part 51 enclosing a periphery of the cover part 50.