Brushless Motor Bracket Noise Suppression via Conducting Pin
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Solution Overview
Problem
Conventional brushless motors in air conditioners face durability issues and high costs due to the use of external metal spring members for noise reduction, which are prone to damage from external factors like water and dust, and struggle to effectively suppress noise terminal voltage causing electromagnetic interference.
Innovation Solution
A brushless motor design where two conductive brackets are electrically connected by a conducting pin inside the stator, protected by molding resin, ensuring long-term durability and noise suppression without the need for large external conductive plates, thus preventing noise radiation and improving electromagnetic compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If external metal spring members are used to connect brackets for noise reduction, then noise terminal voltage is suppressed, but durability deteriorates due to exposure to water and dust
Solution Approach 1:
The patent introduces an elastic insulating member as an intermediary component between the first and second brackets. This member serves dual functions: it provides electrical connection to suppress noise terminal voltage while its insulating properties protect against water and dust infiltration, thereby improving both noise suppression and durability simultaneously
Solution Approach 2:
The elastic insulating member combines elastic properties (for mechanical connection and stress absorption) with insulating properties (for electrical connection and environmental protection). This composite material approach resolves the contradiction by integrating multiple functions into a single component that is resistant to both electrical noise and environmental factors
2Strength
If thick and large spring members are used to provide breaking strength to brackets, then structural strength is improved, but cost increases
Solution Approach 1:
The elastic insulating member acts as a mediator that provides both mechanical support and electrical connection. By distributing stress through the elastic properties and eliminating the need for thick metal spring members, the design achieves required strength at lower cost
Solution Approach 2:
The patent changes the material parameters from thick metal spring members to thin elastic insulating members. This parameter change maintains sufficient mechanical strength through elastic deformation while significantly reducing material cost and manufacturing complexity
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 achieves long-term durability and effective suppression of noise terminal voltage, enhancing the motor's performance and reducing electromagnetic interference while maintaining cost-effectiveness.
Implementation Method 1
the two brackets are electrically connected to each other with a conducting member in the stator
Implementation Method 2
the conducting member is protected with a molding resin
Data Source
AI summary
A brushless motor includes a stator molded integrally with a resin having a fixing member including a stator iron core and a winding wound thereon, a rotor of a disk-like iron core holding a ferrite resin magnet in a circumferential direction, the rotor arranged to face the stator about a shaft, a bearing rotatably supporting the shaft, and conductive brackets fixing the bearing. The brackets are electrically connected to each other with a conducting pin in the stator.