Motor PCB Grounding Layout for Flexible EMI Control
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Solution Overview
Problem
The existing motor designs face challenges in efficiently managing electromagnetic interference (EMI) due to the susceptibility of circuit boards, leading to increased design costs and variability based on the presence or absence of a ground pattern, which complicates the selection of whether the bracket and circuit board should be grounded.
Innovation Solution
A motor design that includes a circuit board with distinct regions for ground patterns and holes, allowing the coupling member to pass through specific holes to couple the board to the housing, enabling the selection of grounding configurations by changing screw positions, thus allowing for both grounded and ungrounded configurations without altering the board design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground pattern is formed on the circuit board to reduce EMI failure risk, then the reliability is improved, but the device complexity increases due to different process designs required for boards with and without ground patterns
Solution Approach 1:
The circuit board is designed with multiple holes in a non-grounded region and at least one hole in a grounded region, allowing the same board to be used for both grounded and ungrounded configurations. The coupling member can be selectively positioned to achieve different grounding states, making the board universal for multiple applications without requiring different process designs.
Solution Approach 2:
The grounding configuration is made dynamic by allowing selective positioning of the coupling member among multiple holes. This enables the system to transition between grounded and ungrounded states as needed, rather than being fixed to a single configuration. The same circuit board can adapt its grounding state based on customer requirements or EMI testing needs.
2Reliability
If different process designs are required for circuit boards with and without ground patterns, then the reliability is improved by matching the board design to grounding needs, but the manufacturing cost increases
Solution Approach 1:
A single circuit board design with multiple holes serves both grounded and ungrounded configurations, eliminating the need for separate process designs. The same board can be manufactured once and then configured differently in the field by changing coupling member positions, significantly reducing design and manufacturing costs while maintaining reliability.
3Ease of manufacture
If the circuit board structure is made susceptible to electromagnetic interference, then the ease of manufacture is improved by using standard board designs, but the reliability deteriorates during EMI testing
Solution Approach 1:
The system allows dynamic selection of grounding configuration through selective positioning of the coupling member. This enables the same standard circuit board to be adapted for EMI-resistant configurations when needed, rather than requiring different board designs. The grounding state can be changed to match testing or operational requirements.
Data Source
AI summary
The present invention provides a motor comprising: a shaft; a rotor coupled to the shaft; a stator disposed outside the rotor; a housing disposed outside the stator; a circuit board disposed on the stator; and a coupling member for coupling the circuit board to the housing. The circuit board includes a first region where a ground pattern is formed, and a second region which is the remainder excluding the first region, wherein the first region has a first hole, and the second region has at least one second hole. The coupling member includes a first screw which is coupled to the housing through one selected from among the first hole and the second hole.