Flexible Wiring Board Layout for EMC in Rotating Assemblies
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Solution Overview
Problem
Existing rotating devices require costly multi-layer power distribution configurations on printed circuit boards to implement electromagnetic compatibility (EMC) measures against electromagnetic wave noises, leading to increased manufacturing costs.
Innovation Solution
A rotating device design that incorporates a flexible wiring board formed from a film, which electrically connects the motor, sensor, and connection terminals, and includes a bent or curved part to surround electronic components, thereby implementing EMC measures at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PCB having a multi-layer power distribution configuration is used for EMC measures, then electromagnetic compatibility is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces the expensive multi-layer PCB with a flexible wiring board made from inexpensive materials such as copper foil and adhesive layers. This flexible board, while simpler in construction, achieves the same EMC shielding function at a fraction of the manufacturing cost, directly applying the principle of substituting expensive components with cheaper alternatives that fulfill the same functional requirement
Solution Approach 2:
The patent employs a flexible wiring board constructed from thin film layers including copper foil for electromagnetic shielding, adhesive layers for bonding, and insulating layers. This thin-film structure provides effective EMC protection while being significantly cheaper and more flexible than rigid multi-layer PCBs, enabling cost-effective electromagnetic compatibility measures
Data Source
AI summary
The rotating device includes a housing, a motor, a gear transmitting rotation of the motor to an outside, a sensor, a connection terminal electrically connected to the outside, and a wiring board. The wiring board electrically connects the motor, the sensor, and the connection terminal. The wiring board is formed of a film having a flexibility. A rotation speed or a rotation angle of the gear is detectable by the sensor. An electronic component controlling the motor is mounted at the wiring board. A part of the wiring board includes a bent part or a curved part and surrounds a part of the electronic component.