Brushless Motor Controller Thermal Management
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Solution Overview
Problem
Conventional DC brushless motor controllers generate excessive heat, leading to component failure and have a complex assembly structure, making mass production inefficient.
Innovation Solution
A controller with a housing made of thermally conductive metal, featuring cooling fins, an insulating heat sink, and a simple screw-based assembly mechanism to facilitate heat dissipation and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the control board operates at high power, then the motor control performance is improved, but the heat generation increases causing electronic components to burn or fail
Solution Approach 1:
The patent converts the harmful heat generated by the control board into a beneficial feature by using the housing as a heat dissipation structure. The housing is designed with heat dissipation fins and is made of thermally conductive material, transforming the heat problem into an effective thermal management solution that maintains component reliability while allowing high power operation.
Solution Approach 2:
The patent introduces a heat dissipation intermediary system consisting of the housing, heat dissipation fins, and insulating heat sink. This intermediary structure mediates between the heat-generating control board and the external environment, efficiently transferring heat away from sensitive components while maintaining electrical isolation through the insulating heat sink material.
2Temperature
If conventional housing materials are used, then manufacturing cost is reduced, but heat dissipation efficiency is insufficient leading to high operating temperature
Solution Approach 1:
The patent changes the thermal conductivity parameter of the housing material from conventional low-conductivity materials to high-conductivity metal alloys. This parameter change enables efficient heat dissipation while the selected alloy materials maintain good manufacturability through standard casting and machining processes.
Solution Approach 2:
The patent adds dimensional complexity to the housing by incorporating heat dissipation fins that extend from the housing surface. This dimensional enhancement dramatically increases the heat dissipation surface area, improving thermal performance while the fin structures can be integrated into the housing manufacturing process.
3Strength
If a complex connection structure is used between housing and motor, then assembly strength is improved, but mass assembly efficiency is reduced
Solution Approach 1:
The patent merges the connection function with the housing structure itself by designing protrusions that are integrated into the housing body. These protrusions serve both as structural elements and as connection features, eliminating the need for separate complex fastening mechanisms and enabling efficient mass assembly through simple screw fastening.
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 solution effectively reduces operating temperatures and failure rates by enhanced heat dissipation and simplifies assembly through improved structural design.
Implementation Method 1
the housing is made of a metal or a metallic material having good thermal conductivity
Implementation Method 2
a plurality of cooling fins is disposed at the bottom of the housing
Implementation Method 3
an insulating heat sink disposed between the integrated power module chip and the inner bottom wall of the housing
Implementation Method 4
an insulating heat sink disposed between the integrated power module chip and the inner bottom wall of the housing
Data Source
AI summary
Taught herein is a controller for a DC brushless motor comprising a control board (3) and a housing (4); wherein the control board (3) is disposed in the housing (4), and the housing (4) is made of metal materials with good thermal conductivity; a plurality of heat sinks (5) are disposed at the bottom of the housing (4), thereby heat generated by the control board (3) will be dissipated fast, and the operating temperature and failure rates are reduced; an integrated power module chip (7) disposed at the bottom of the control board (3) transfers heat to the housing (4) via an insulating heat sink (8), and in doing so prevents electric leakage; the purpose of a plurality of gaps (9) disposed at the top of the housing (4) is to provide ventilation, and to dissipate heat fast; all of these design characteristics make the invention simple in structure, and convenient for mass assembly.