Electric Machine Inverter Layout With Shared AC Interface
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Solution Overview
Problem
The existing inverter architecture for electric or hybrid vehicles is complex and difficult to control due to independent three-phase currents from different power modules, leading to operational disturbances and manufacturing challenges.
Innovation Solution
A simplified inverter architecture with a symmetrical arrangement of power modules connected to a shared capacitive module, where alternating current connections are closer to the median plane, reducing interference with additional components and improving compactness, and using a shared connection interface with reduced dimensions to power a three-phase electric motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two independent power modules with three-phase currents are used to power an electric machine, then high power delivery is achieved, but operational disturbances occur due to different current characteristics
Solution Approach 1:
The patent combines the AC connections of two power modules into a single shared connection interface. The first and second AC connections are merged to connect to the same electric machine phases, allowing the power modules to deliver high power while operating from a common reference potential provided by the capacitive module, thereby eliminating operational disturbances.
2Power
If two independent power modules with similar phase shift currents are combined within a connection interface, then high power is delivered, but the connection interface architecture becomes complex
Solution Approach 1:
The patent merges the AC connections of both power modules into a single shared connection interface that connects to the electric machine. This consolidation reduces the complexity of the connection interface architecture by eliminating the need for separate connection interfaces, while still enabling high power delivery through coordinated operation of both power modules.
3Ease of manufacture
If AC connections are arranged on the same side of power modules as DC connections, then manufacturing is simplified, but additional components such as electronic boards cannot be properly arranged
Solution Approach 1:
The patent positions the AC connections on the opposite side of the power module from the DC connections. This spatial separation in a different dimension allows electronic boards and other additional components to be arranged on the same side as the DC connections without interference, while the AC connections on the opposite side maintain proper electrical connections to the electric machine.
4Volume of moving object
If a shared connection interface with reduced dimensions is used to power the electric machine, then device compactness is improved, but precise positioning of connections is required
Solution Approach 1:
The patent merges the AC connections of both power modules into a single shared connection interface with reduced dimensions. This consolidation significantly improves the compactness of the inverter by eliminating redundant connection structures. The symmetrical arrangement of power modules around the capacitive module facilitates precise positioning and alignment of the shared connection interface.
Data Source
Figure 1~3
Figure 3
AI summary
The present invention relates to an inverter (1), comprising: - a capacitive module (2); - a first power module (3a) connected to the capacitive module (2) by a first DC connection (4a) and comprising a first AC connection (5a) disposed on an opposite side of the first power module (3a); - a second power module (3b) connected to the capacitive module (2) by a second DC connection (4b), and comprising a second AC connection (5b) disposed on an opposite side of the second power module (3b); the power modules (3a, 3b) being disposed on the same side of the capacitive module (2), on either side of a median plane (P) of the capacitive module (2), the AC connections (5a, 5b) are closer to the median plane (P) of the capacitive module (2) than the DC connections (4a, 4b).