Electric Drive Device Phase Windings Isolation
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Solution Overview
Problem
Electrical drive devices, particularly in aircraft applications, face reliability issues due to potential short-circuits in stator windings, which can lead to thermal destruction and safety hazards, and existing solutions often compromise efficiency and power density with complex mechanical devices.
Innovation Solution
The electrical drive device is designed with phase windings subdivided into electrically isolated part-windings and inverter units featuring separate phase modules, allowing for redundancy and independent operation to mitigate the effects of malfunctions, such as short-circuits, through vector control and thermal coupling for enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase windings are subdivided into electrically isolated part-windings with separate phase modules, then reliability is improved by enabling continued operation after malfunction, but device complexity increases due to additional isolation requirements and modular structure
Solution Approach 1:
The phase windings are divided into first and second electrically isolated part-windings, and the inverter units are segmented into first and second phase modules. Each part-winding is connected to a separate phase module, creating electrically isolated pathways that allow continued operation of one module even when the other fails, thus improving reliability while maintaining manageable complexity through modular design.
2Object-affected harmful factors
If separate phase modules deliver electrical phases in electrically isolated manner, then the impact of short-circuits is reduced, but manufacturing complexity increases due to additional isolation measures
Solution Approach 1:
The inverter units are divided into separate phase modules (first and second phase modules) that deliver electrical phases in electrically isolated manners. This segmentation creates physical and electrical barriers that prevent short-circuit propagation between modules, reducing the impact of harmful factors while the modular structure facilitates standardized manufacturing processes.
Solution Approach 2:
Electrically isolating structures serve as intermediaries between the first and second phase modules, preventing direct electrical contact and thus blocking the propagation of short-circuits. These intermediary isolation elements are designed to be integrated into the modular structure, balancing protection functionality with manufacturing ease.
3Reliability
If redundancy is implemented through separate phase modules and part-windings, then continued operation after malfunction is enabled, but weight and volume increase due to additional components
Solution Approach 1:
Both first and second phase modules are designed with identical or similar structures, where each module can independently deliver electrical phases and drive the rotating electrical machine. This universality allows either module to take full responsibility for operation in case the other fails, enabling continued operation without requiring asymmetric or specialized redundant components that would increase weight.
Solution Approach 2:
The redundancy is achieved through segmentation into two independent phase modules rather than adding separate backup systems. Each module is a functional duplicate that can operate independently, providing weight-efficient redundancy compared to traditional backup systems while maintaining the ability to continue operation after malfunction.
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 configuration significantly improves the reliability of electrical drive devices by enabling continued operation and reducing the impact of malfunctions, such as short-circuits, without compromising efficiency or power density, thereby enhancing safety and reducing the risk of damage.
Implementation Method 1
a control unit which is configured to control the inverter units by the application of vector control
Implementation Method 2
each of the phase windings includes a first part-winding (24) and a second part-winding (26) that is electrically isolated from the first part-winding (24)
Data Source
AI summary
The disclosure relates to an electrical drive device having: an inverter including an inverter unit for each phase; a control unit configured to control the inverter units by application of vector control; and a rotating electrical machine having a stator that includes a plurality of phase windings connected to the inverter units. Each of the phase windings includes a first part-winding and an electrically isolated second part-winding. The inverter units include a first phase module and a second phase module. The phase modules deliver the electrical phase assigned to the respective inverter unit in a separate and a mutually electrically isolated manner. The first part-winding is electrically connected to the first phase module and the second part-winding is electrically connected to the second phase module.