Inductive Rotor Position Sensor PCB Layout for EMI Shielding
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Solution Overview
Problem
Existing inductive rotor position sensor devices face challenges in maximizing installation space utilization and effectively shielding the processing unit from electromagnetic interference while maintaining signal integrity.
Innovation Solution
The coils are positioned on the front side of the circuit board, and the processing unit is placed on the rear side, with shielding layers between them to prevent electromagnetic interference. The circuit board is designed with a circular disk shape and includes radially slotted shielding layers to minimize signal attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the processing unit and coils are situated on the same circuit board to implement simple electrical connection and obtain compact configuration, then the electrical connection is simplified and the configuration is compact, but the installation space for the coils is reduced and electromagnetic interference may occur
Solution Approach 1:
The circuit board is divided into two sides: the front side is dedicated exclusively to coil arrangement, while the rear side houses the processing unit. This segmentation allows each component to occupy its optimal space without interference, maximizing coil installation area while maintaining simple electrical connections through vertical vias.
Solution Approach 2:
Instead of arranging components in a planar layout on the same side of the circuit board, the invention transitions to a three-dimensional arrangement by placing the processing unit on the rear side and coils on the front side. This dimensional change eliminates space competition while maintaining electrical connectivity.
2Volume of stationary object
If the processing unit is placed close to the coils for compact configuration, then the device size is reduced, but electromagnetic waves may interfere with the processing unit operation
Solution Approach 1:
The circuit board is segmented into two distinct sides: the front side for coils and the rear side for the processing unit. This physical segmentation through the circuit board substrate provides natural electromagnetic isolation while maintaining compact overall device volume.
Solution Approach 2:
The circuit board itself acts as an intermediary barrier between the coils and the processing unit. The substrate material and internal ground planes of the circuit board provide electromagnetic shielding, preventing harmful interference while allowing compact integration.
3Object-affected harmful factors
If shielding layers are added between the coils and processing unit to prevent electromagnetic interference, then electromagnetic shielding is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The circuit board is designed to serve multiple functions simultaneously: it provides mechanical support for mounting coils and processing unit, establishes electrical connections through vias, and acts as an electromagnetic shielding barrier. This multi-functionality eliminates the need for separate shielding components, reducing device complexity.
Solution Approach 2:
The circuit board's substrate material properties and ground plane configuration are optimized to provide adequate electromagnetic shielding. By adjusting parameters such as substrate thickness, dielectric constant, and ground plane continuity, effective shielding is achieved without adding complex shielding structures.
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
This configuration maximizes the use of available installation space for the coils, ensures effective shielding to prevent electromagnetic interference, and minimizes signal attenuation, resulting in an efficient and reliable rotor position sensor device.
Implementation Method 1
inductive rotor position sensor devices take advantage of the effect that the electromagnetic waves are traceably influenced as a function of the rotor angular position of a rotor which is exposed to a field of electromagnetic waves of a transmitter coil
Implementation Method 2
The electromagnetic waves thus couple from the transmitter coil into the rotor, and from the rotor into a receiver coil
Implementation Method 3
at least one shielding layer for shielding the processing unit against the electromagnetic waves is situated between the coils and the processing unit
Data Source
AI summary
An inductive rotor position sensor device for detecting a rotor angular position of a rotor of an electric machine. The inductive rotor position sensor device includes a transmitter coil for generating electromagnetic waves and a receiver coil for detecting the electromagnetic waves generated by the transmitter coil and influenced by the rotor, and includes a processing unit, which is designed to activate the transmitter coil and to evaluate the electromagnetic waves detected by the receiver coil for determining the rotor angular position. The coils and the processing unit are situated on a shared circuit board. The coils are situated on a front side, and the processing unit is situated on a rear side of the circuit board which faces away from the front side.