Motor Driver Power Board Layout for Air-Cooled Heat Dissipation
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Solution Overview
Problem
Existing electric vehicle motor controller power boards suffer from inadequate heat dissipation, leading to low power density and performance limitations, particularly in large aircraft where weight and power output demands are high, resulting in the need for complex and heavy water-cooled systems.
Innovation Solution
A motor-driven power board with a compact, air-cooled design featuring transistors arranged along the edge of a hexagonal or circular PCB, capacitors symmetrically distributed near the center, and conductive strips for improved heat dissipation, allowing for efficient current sharing and reduced heat concentration, enabling air-cooled convective cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power components are concentrated in the center of the power board, then current-sharing capacity is improved, but heat dissipation performance deteriorates
Solution Approach 1:
The power board is divided into distinct functional zones: a central region for high-current components (terminal posts, power buses) and peripheral regions for heat-generating components (transistors, capacitors). This spatial segmentation allows current-sharing capacity to be optimized in the center while heat dissipation is optimized at the periphery through natural convection and radiation to the environment.
Solution Approach 2:
Different regions of the power board are designed with different thermal characteristics. The central region uses high-conductivity materials for current distribution, while the peripheral region where transistors are mounted has enhanced heat dissipation capabilities through direct exposure to ambient air flow, allowing each zone to perform its primary function optimally.
2Ease of manufacture
If a rectangular power board layout is used, then ease of assembly is improved, but heat dissipation performance deteriorates
Solution Approach 1:
The power board transitions from a conventional rectangular shape to a circular or hexagonal geometry. This curved/symmetric shape provides superior heat dissipation characteristics by allowing uniform heat distribution and convection in all directions from the peripheral components, while still maintaining ease of assembly through standardized mounting patterns and symmetric component placement.
3Power
If power density is increased, then power output capability is improved, but heat dissipation requirements increase
Solution Approach 1:
The design moves heat dissipation from a two-dimensional plane (relying on board surface area) to a three-dimensional solution by utilizing the vertical dimension for natural convection currents. Hot air rises from the peripheral components, creating continuous air circulation that enhances heat removal without requiring additional board area or complex cooling systems, thereby supporting higher power density.
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 design enhances heat dissipation and current-sharing capacity, reduces the driver's volume, weight, and complexity, and eliminates the need for water-cooled systems, resulting in a more compact, lightweight, and cost-effective motor driver with improved power density.
Implementation Method 1
The motor driver can be provided with an air flow channel to provide air flow for heat dissipation for the power components on the PCB board
Data Source
AI summary
A motor-driven power board having a PCB and a plurality of transistors uniformly arranged along the edge of the PCB and a plurality of capacitors uniformly arranged along the inner side of the transistor. There is a plurality of terminals uniformly arranged along the inner side of the transistor. The board further includes a positive pole of power bus, a negative pole of power bus and a signal wire which are all located in the middle of the PCB. The invention improves the heat dissipation and current-sharing capacity of the power board by uniformly setting the power components from the inside to the outside according to the heat value while at the same time reduces the heat value in the middle of the power board, so that the motor of the driver using the power board can be assembled near the middle of the power board.