Motor Assembly Connection Ring Layout for Airflow and Vibration
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Solution Overview
Problem
Electric motor assemblies with reduced size and weight face challenges in connecting neutral lines stably, dissipating heat, and reducing air flow resistance and noise due to increased vibration and electromagnetic imbalance.
Innovation Solution
An electric motor assembly design featuring a connection ring that electrically connects neutral lines of the stator coil, a bracket with air-passing and non-passing areas to minimize air resistance, and a bearing accommodating portion to improve concentricity and reduce vibration, allowing for quick and easy neutral line connection and enhanced heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of the electric motor assembly is significantly reduced, then the weight and dimensions are improved for user convenience, but the gap between teeth of the stator core and connection parts is reduced making it difficult to wind the stator coil
Solution Approach 1:
The stator core is divided into a yoke part and multiple tooth parts that can be manufactured separately and then coupled together. This segmentation allows the tooth parts to be positioned precisely with adequate gaps for winding stator coils, even in compact motor assemblies with reduced size and weight.
2Reliability
If power lines and neutral lines are disposed on the flow path of air, then electrical connection is achieved, but flow resistance of air increases and noise increases due to contact with flowing air
Solution Approach 1:
The neutral line connection part is extracted from the air flow path and positioned in a region where air does not flow. This extraction eliminates the harmful interaction between the neutral line and flowing air, reducing both air flow resistance and noise while maintaining reliable electrical connection.
3Reliability
If neutral line connection part protrudes in axial direction between power line connection parts, then connection structure is formed, but significant gap cannot be secured between connection parts making heat dissipation difficult
Solution Approach 1:
The neutral line connection part is positioned in the circumferential direction rather than protruding in the axial direction between power line connection parts. This dimensional repositioning creates adequate spacing in all directions, allowing heat to dissipate effectively from both the neutral line and power line connection parts.
4Volume of moving object
If split core structure is used with multiple coil parts, then size reduction is achieved, but connection of neutral lines becomes difficult and unstable
Solution Approach 1:
The neutral line connection part is designed with a universal structure that can simultaneously connect neutral lines from multiple coil parts. The connection part includes multiple connection terminals that can receive and electrically connect neutral lines from different coil parts in a single operation, simplifying the assembly process despite the split core structure.
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 enables stable neutral line connections, reduced air flow resistance, improved heat dissipation, and reduced vibration and noise, leading to a more efficient and compact electric motor assembly with increased bearing longevity.
Implementation Method 1
a connection ring that electrically connects neutral lines of the stator coil
Implementation Method 2
a bracket with air-passing and non-passing areas to minimize air resistance
Implementation Method 3
a bearing accommodating portion to improve concentricity and reduce vibration
Data Source
AI summary
An electric motor assembly includes a housing, an impeller disposed inside the housing, a stator disposed at one side of the impeller in an axial direction of the impeller, the stator comprising a plurality of coil parts, a rotor that includes a rotation shaft connected to the impeller and that is configured to rotate relative to the stator, a bracket that is coupled to the housing and supports the rotation shaft, and a connection ring that electrically connects together end portions of the plurality of coil parts.