Inductive Element with Spaced Covers for Q-Value Reduction
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Solution Overview
Problem
Existing inductive elements face challenges in lowering the Q-value effectively, which is necessary to reduce normal mode noises near resonance frequencies.
Innovation Solution
An inductive element configuration featuring an annular core covered by two spaced-apart covers, with windings around the core and covers, increases the resistance component Rs for the normal mode, allowing for a lower Q-value without additional resistors, and includes a heat sink for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the Q-value is lowered to reduce normal mode noises near resonance frequencies, then the resistance component Rs must be increased, but this requires adding resistors or changing the structure significantly
Solution Approach 1:
The cover is divided into two separate parts: a first cover covering the first winding and a second cover covering the second winding. These covers are spaced apart from each other, creating gaps that increase the resistance component Rs for normal mode currents, thereby lowering the Q-value and reducing normal mode noises without requiring additional resistors
Solution Approach 2:
The spaced-apart covers act as an intermediary structure between the windings and the external environment. The gaps between the covers serve as a mediating mechanism that increases resistance to normal mode currents, achieving noise reduction through the structural arrangement rather than direct addition of resistive components
2Object-generated harmful factors
If additional components are added to increase resistance component Rs and lower Q-value, then the normal mode noises are reduced, but the inductive element size increases
Solution Approach 1:
The covers serve multiple functions: they provide mechanical protection for the windings, structurally increase the resistance component Rs through their spaced-apart configuration, and contribute to heat dissipation. This multi-functionality allows the inductive element to reduce normal mode noises without requiring separate components that would increase size
Solution Approach 2:
The noise reduction function is merged into the cover structure itself. By making the covers spaced-apart, the same structural element that protects the windings also increases Rs and lowers the Q-value, eliminating the need for separate noise reduction components
3Volume of moving object
If the covers are placed close together to maintain compact size, then the inductive element remains small, but the resistance component Rs is insufficient and Q-value remains high
Solution Approach 1:
The critical parameter changed is the distance between the covers. By optimizing the spacing between the first and second covers, the resistance component Rs is increased to an effective level that lowers the Q-value and reduces normal mode noises, while maintaining a compact overall size
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 configuration effectively lowers the Q-value by increasing the resistance component Rs, reducing normal mode noises, and enhances heat dissipation, maintaining the inductive element's size and shape without additional components.
Implementation Method 1
the inner end surfaces of the first and second covers are spaced apart from each other, and the outer end surfaces of the first and second covers are spaced apart from each other. By the above-described configuration, an LC filter including the above-described inductive element has an increased resistance component Rs for the normal mode.
Implementation Method 2
the inductive element may further include a heat sink, and the heat sink may be disposed between the first and second windings. Since a part located between the windings generates a larger amount of heat than the other part does, the heat sink can quickly radiate (i.e., dissipate) the generated heat.
Data Source
AI summary
The present disclosure provides an inductive element capable of lowering a Q-value. An inductive element includes a first cover and a second cover covering an annular core, and a first winding and a second winding wound around a region of the core, the first cover and the second cover. The first cover covers a part of an inner circumferential surface of the core, a part of an outer circumferential surface and an end surface on one end side in an axial direction. The second cover covers a part of the inner circumferential surface of the core, a part of the outer circumferential surface an end surface on the other end side in the axial direction.