Motor Drive Power Plane Layout for In-Envelope Thermal Isolation
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Solution Overview
Problem
Variable frequency drives are sensitive to high temperatures, leading to improper operation or premature failure when combined with motor assemblies, necessitating a better method to reduce this sensitivity and allow installation within the motor assembly envelope.
Innovation Solution
A motor assembly design incorporating a mid-plate and end-plate with internal and external radial cooling fins, insulation layers, and a power plane with thermal barriers to manage heat transfer and reduce temperature sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If variable frequency drive electronics are installed inside the motor assembly envelope, then power density is increased and space is optimized, but the electronics are exposed to high temperatures causing improper operation or premature failure
Solution Approach 1:
The motor assembly is segmented into distinct thermal zones using insulation barriers and cooling channels. The electronics are isolated in a protected compartment separated from the high-temperature motor operating environment, allowing the electronics to maintain reliable operation while achieving high power density through integrated packaging.
Solution Approach 2:
Thermal barriers and insulation materials are introduced as intermediary elements between the motor windings and the electronics. These intermediaries block heat transfer pathways, creating a thermal buffer that protects temperature-sensitive electronics from the harsh thermal environment while enabling compact integration.
2Temperature
If cooling fins are added to the plate structure, then heat transfer capability is improved, but device complexity increases
Solution Approach 1:
The plate structure with cooling fins serves multiple functions simultaneously: it provides structural support for the motor assembly, acts as a heat dissipation component through the fins, and forms part of the thermal management system. This multi-functionality reduces the need for separate cooling components, thereby limiting the increase in device complexity while improving heat transfer capability.
Solution Approach 2:
The cooling fins are integrated directly into the plate structure rather than being separate attachments. This merging of the structural plate and cooling function creates a unified component that eliminates additional assembly steps and reduces overall structural complexity while maintaining effective heat dissipation.
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 effectively transfers heat away from the electronics, allowing the variable frequency drive to operate within the motor assembly envelope without failure, enhancing power density and reliability.
Implementation Method 1
internal radial cooling fins extending from the inner circumference of the central portion and diverging outwardly towards the peripheral portion to transfer heat from the central portion to the peripheral portion allowing for internal conduction heat capability
Implementation Method 2
external radial cooling fins diverging outwardly away from the plate to transfer the heat to surrounding air allowing for external convection heat capability
Implementation Method 3
an insulation layer arranged in relation to the mid-plate, and configured to reduce the rate of heat transfer, including all forms of heat transfer from conduction, convection and radiation
Data Source
AI summary
A motor assembly for driving a pump or rotary device features a power plane with a circular geometry to be mounted inside a space envelope having a similar circular geometry formed on an end-plate between an inner hub portion and a peripheral portion that extends circumferentially around the space envelope of the end-plate. The power plane is a multi-layer circuit board or assembly having: a power layer with higher temperature power modules for providing power to a motor, a control layer with lower temperature control electronics modules for controlling the power provided to the motor, and a thermal barrier and printed circuit board layer between the power layer and the control layer that provides electrical connection paths between the power modules of the power plane and the control electronics modules of the control layer, and also provides insulation between the power layer and the control layer.