Motor Stator Grounding Structure for EMC Without Core Damage
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Solution Overview
Problem
Conventional motor stator anti-interference structures damage the structural integrity of silicon steel sheets and have weak binding due to manufacturing tolerances, limiting their electromagnetic compatibility improvement.
Innovation Solution
A grounding structure for a motor stator using upper and lower insulating frames to clamp a silicon steel sheet unit, with a conductive member between the frames and a circuit board connected to the conductive member, ensuring secure grounding without cutting the silicon steel sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connector member is embedded in a slit of the silicon steel sheet unit to achieve grounding, then electromagnetic compatibility is improved, but the structural integrity of the silicon steel sheet unit is damaged
Solution Approach 1:
The patent introduces an insulating frame as an intermediary component that bridges the silicon steel sheet unit and the connector member. The insulating frame includes a clamping portion that contacts the silicon steel sheet unit and a grounding portion that connects to the connector member, thereby transmitting grounding function without requiring direct embedding in the silicon steel sheet unit. This resolves the contradiction by mediating between the grounding requirement and the structural integrity requirement.
2Reliability
If a connector member is used for grounding, then electromagnetic compatibility is improved, but the binding between the connector member and silicon steel sheet unit is weak due to manufacturing tolerances
Solution Approach 1:
The patent segments the grounding connection into multiple functional portions: the clamping portion of the insulating frame that contacts the silicon steel sheet unit, the intermediate connection structure, and the grounding portion that connects to the connector member. This segmentation allows each portion to be optimized independently, with the clamping portion designed to accommodate manufacturing tolerances while maintaining reliable electrical contact, thus resolving the binding strength issue.
Solution Approach 2:
The insulating frame is designed with a clamping portion that provides beforehand cushioning for manufacturing tolerances. The clamping structure includes features that can accommodate dimensional variations in the silicon steel sheet unit while maintaining consistent contact pressure and electrical connection, preventing the binding strength from being compromised by manufacturing variations.
3Reliability
If electronic components or conductive materials are inserted in the circuit board to eliminate electromagnetic interference, then electromagnetic compatibility is improved, but the motor characteristics are adversely influenced
Solution Approach 1:
The patent extracts the grounding function from the circuit board and relocates it to the insulating frame and connector member assembly. By taking out the grounding connection from the circuit board, the patent eliminates the need to insert electronic components or conductive materials into the circuit board that would adversely affect motor characteristics, while still achieving electromagnetic compatibility through the alternative grounding path provided by the insulating frame 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 provides secure grounding without damaging the silicon steel sheet structure and enhances electromagnetic compatibility by ensuring a strong, stable connection.
Implementation Method 1
a conductive member (24) confined between the silicon steel sheet unit (21) and the lower insulating frame (23)... connected to a ground contact of a circuit board (25)
Implementation Method 2
an upper insulating frame (22) disposed at an upper side of the silicon steel sheet unit (21) along an axis, a lower insulating frame (23) disposed at a lower side of the silicon steel sheet unit (21) along the axis and cooperating with the upper insulating frame (22) to clamp the silicon steel sheet unit (21) therebetween
Data Source
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AI summary
A grounding structure for a motor stator includes a silicon steel sheet unit (21), and upper and lower insulating frames (22, 23) clamping the silicon steel sheet unit (21) therebetween. The grounding structure further includes a conductive member (24) and a circuit board (25). The conductive member (24) is clamped between the silicon steel sheet unit (21) and the lower insulating frame (23), and protruding from a lower end of the lower insulating frame (23). The circuit board (25) is disposed at a lower side of the lower insulating frame (23), and includes a negative contact (251) that is connected to a lower edge of the conductive member (24) .