Motor Control Board Heat Transfer Plate for Compact Cooling
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Solution Overview
Problem
Existing motor devices face challenges in efficiently dissipating heat without increasing their size, particularly due to limited space for heat sinks, leading to reduced heat exhaust efficiency and potential size expansion.
Innovation Solution
A motor device design featuring a heat dissipation member with a heat reception plate and a heat transfer plate protruding from the reception plate, integrated into a housing that extends in the direction of the rotation shaft, allowing for increased contact area and improved heat dissipation without enlarging the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heat sink is fixed to the outer side of the motor accommodation space with bolts, then the heat sink can be mounted on the housing, but the contact area between the heat sink and the housing cannot be increased due to limited space
Solution Approach 1:
The heat transfer plate extends in the axial direction (another dimension) from the heat reception plate, allowing heat dissipation to occur along the length of the extension rather than relying solely on radial attachment surface area. This dimensional transition enables increased heat dissipation efficiency without requiring larger radial attachment surfaces on the housing.
2Temperature
If the size of the motor device is increased in the radial direction to improve heat exhaust efficiency, then the contact area between the heat sink and the housing can be increased, but the overall device size increases
Solution Approach 1:
Instead of increasing the radial size of the motor device to provide larger heat sink contact areas, the invention extends the heat transfer plate in the axial dimension. This allows the heat dissipation function to be enhanced along the rotation shaft extension direction, maintaining a compact radial profile while improving heat exhaust efficiency through increased heat transfer path length.
3Loss of energy
If a heat sink is mounted on the housing, then heat can be dissipated from the control circuit, but the heat exhaust efficiency is insufficient due to limited contact area
Solution Approach 1:
The heat transfer plate extends in the axial direction from the heat reception plate, transforming the heat dissipation approach from relying on radial contact area to utilizing axial extension length. This dimensional change increases the effective heat transfer area and path without requiring larger radial mounting surfaces, thereby improving heat exhaust efficiency.
Solution Approach 2:
The heat transfer plate acts as an intermediary component between the heat reception plate (attached to the control board) and the housing. This intermediate structure extends the heat transfer path and provides a larger surface area for heat dissipation to the housing, improving overall heat exhaust efficiency from the control circuit.
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
Enhances heat exhaust efficiency, reduces device size, and extends the device's lifespan while minimizing waste generation and weight, contributing to sustainable practices.
Implementation Method 1
a heat dissipation member configured to dissipate heat generated by a heating element included in the control circuit to the housing
Data Source
AI summary
A motor device includes an electric motor, a control board on which a control circuit controlling the electric motor is mounted, a metal housing supporting a first surface of the control board, a resin cover attached to the housing to cover a second surface of the control board opposite to the first surface and the periphery of the control board, and a heat dissipation member dissipating heat generated by a heating element included in the control circuit to the housing. The heat dissipation member includes a heat reception plate fixed to the cover, and a heat transfer plate protruding toward the housing. The housing includes, outside the motor accommodation space, a reception portion receiving a protrusion end of the heat transfer plate inserted in a direction in which a rotation shaft extends, and a heat exhaust wall extending in the and coming into surface contact with the heat transfer plate.