Motor Drive Inverter Integration with Remote Control Board
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Solution Overview
Problem
Current hybrid-electric vehicle systems require separate power control units and electric motors, leading to high costs, weight, space requirements, and electromagnetic interference due to long high-voltage cables, as well as thermal management challenges for sensitive control boards.
Innovation Solution
The power switching devices (IGBTs or MOSFETs) are housed separately from their controls and mounted adjacent to the electric motor, with control circuits located remotely, connected via low-current signal conductors or radio connections, and smart gate driver ICs provide protection and independent shutdown capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If power control unit and electric motor are separated into different housings, then control circuits can be thermally managed separately, but long high-voltage cables are required connecting them
Solution Approach 1:
The system is divided into two separate modules: a power module housing containing the power switching devices (IGBTs/MOSFETs) and a control module housing containing the control circuits. This segmentation allows each module to be optimized independently - the power module can be cooled separately from the sensitive control circuits, while still maintaining compact integration through the shared housing structure.
2Volume of moving object
If power switching devices are mounted adjacent to electric motor in separate housing, then integration and space efficiency improve, but thermal management becomes more challenging
Solution Approach 1:
A shared housing structure serves as an intermediary between the power module and control module, providing both mechanical support and thermal management functions. The housing includes dedicated cooling channels and heat sinks that interface with the power switching devices, while maintaining thermal isolation from the sensitive control circuits. This intermediary structure enables compact integration without compromising thermal performance.
3Reliability
If separate power control unit is used with massive cables, then electrical isolation and safety are improved, but weight and cost increase
Solution Approach 1:
The power module housing and control module housing are merged into a single integrated assembly with shared structural components and cooling systems. This merging eliminates the need for massive external cabling while maintaining electrical isolation through proper internal layout and shielding. The integrated design reduces overall system weight while preserving safety through maintained electrical separation between high-power and low-power circuits.
4Object-generated harmful factors
If power control unit is integrated closer to electric motor, then cable length and EMI are reduced, but thermal management of power devices becomes more difficult
Solution Approach 1:
The housing structure implements local quality differentiation with dedicated thermal management zones. The power module section includes integrated heat sinks and cooling channels directly coupled to the power switching devices, while the control module section maintains separate thermal characteristics. This localized thermal management approach enables close integration of power and control modules without compromising the cooling efficiency of high-power components.
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 integration reduces the need for long cables, weight, and space, improves thermal and electrical reliability, and decreases EMI, allowing for a more compact, cost-effective, and reliable system with reduced manufacturing and testing costs.
Implementation Method 1
The main task of the inverter 11 is to transfer the DC-current/voltage into an AC-current/voltage and vice-versa
Implementation Method 2
The inverter units 11 are mounted in the relatively big and heavy box or housing 12 forming the power control or management unit... The box 12 with the power control unit can also include further elements like a DC/DC converter
Implementation Method 3
a heatsink 21 which normally needs to be actively cooled by a fluid coolant applied to inlet and outlet conduits
Data Source
AI summary
The power switches of an inverter are mechanically integrated with an electric motor of a vehicle and are mounted on the end plate of the motor and employ short connections between the motor a-c terminals and the inverter a-c output terminals. Bond wireless modules are employed. The electronic controls for the inverter are mounted on a main control board which is positioned remotely from the inverter and is not subject to the heat and EMI produced by the inverter.