Motor Control PCB Layout for Noise-Resistant Signal Routing
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Solution Overview
Problem
Conventional motor control devices experience noise interference due to the magnetic fields generated by power lines, which can affect the accuracy of electric signals transmitted for motor control.
Innovation Solution
The motor control device is designed with a board layout that separates signal paths from power paths, ensuring they do not cross over each other when viewed axially, thereby minimizing noise interference from magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power lines and signal lines are disposed on the board in a conventional layout, then the board can accommodate all necessary electronic components and wiring, but noise may be superimposed on electric signals due to magnetic field influence from power lines
Solution Approach 1:
The board is divided into a first area and a second area by a boundary line passing through the motor center. Power circuit areas and control circuit areas are segregated into different regions, with signal paths confined to their respective areas to prevent crossing power paths. This spatial segmentation reduces magnetic field interference between power and signal lines.
Solution Approach 2:
Signal lines are extracted from the general board layout and routed through dedicated signal paths that are explicitly designed to avoid power paths. The signal transmission routes are separated from power transmission routes, removing the harmful magnetic field influence from the signal paths.
2Object-affected harmful factors
If signal paths are routed to avoid power paths, then noise interference is reduced, but the board layout becomes more complex
Solution Approach 1:
The board is divided into a first area and a second area by a boundary line passing through the motor center. Power circuit areas and control circuit areas are segregated into different regions, with signal paths confined to their respective areas to prevent crossing power paths. This spatial segmentation reduces magnetic field interference between power and signal lines.
3Reliability
If power circuit areas and control circuit areas are separated into different regions, then signal integrity is improved, but the board area required increases
Solution Approach 1:
The board is divided into a first area and a second area by a boundary line passing through the motor center. Power circuit areas and control circuit areas are segregated into different regions, with signal paths confined to their respective areas to prevent crossing power paths. This spatial segmentation reduces magnetic field interference between power and signal lines.
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 effectively suppresses noise superimposition on electric signals, improving the accuracy and reliability of motor control operations.
Implementation Method 1
a sensor provided on the board and configured to generate an electric signal based on rotation of the motor
Implementation Method 2
a power circuit area for converting electric power supplied from an external power supply into electric power to be supplied to the winding group
Implementation Method 3
A current having a larger value flows through the power line compared with the signal line. Therefore, noise may be superimposed on the electric signal due to influence of a magnetic field generated from, for example, the power line
Data Source
AI summary
A motor control device controls a motor including winding groups of two systems. The motor control device includes a board and sensors provided on the board and configured to generate electric signals based on rotation of the motor. The board includes a first area and a second area defined across a boundary line. The first area and the second area include power circuit areas, control circuit areas, signal paths through which the electric signals are transmitted to the control circuit areas, and power paths through which electric power supplied from a power supply is transmitted to the power circuit areas, respectively. The signal paths are provided not to cross the power paths and the power circuit areas when viewed in an axial direction of the motor, respectively.