Rail Vehicle Coolant Pump Supply on a Separate DC Network
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrically powered vehicles face interference issues in their three-phase electrical systems, which can compromise the reliable operation of coolant pumps during electrodynamic braking, particularly in emergency situations.
Innovation Solution
The vehicle incorporates a second electrical system, preferably a DC network, to power coolant pumps independently from the main three-phase system, ensuring continuous cooling of power semiconductors and preventing overheating during emergency braking by using DC-operated or DC-inverter-powered coolant pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a battery is used to power the vehicle, then energy supply for driving is improved, but the weight of the vehicle increases
Solution Approach 1:
The power supply system is segmented into multiple independent battery units distributed throughout the vehicle body, rather than using a single large battery. This allows the energy storage function to be achieved while distributing the weight across multiple locations, reducing the impact on vehicle dynamics and allowing flexible placement away from critical areas.
Solution Approach 2:
The battery units are integrated into the vehicle structure by placing them within the hollow space of the vehicle body, nesting the power supply system within the existing structural framework. This utilizes otherwise wasted space and avoids adding external weight, as the batteries are accommodated within the existing vehicle envelope.
2Use of energy by moving object
If a battery is mounted on the vehicle, then energy storage capacity is improved, but the hollow space of the vehicle body is reduced
Solution Approach 1:
The battery units are nested within the hollow space of the vehicle body, utilizing the existing structural volume. The batteries are positioned in the space between the outer skin and the load-bearing structure, effectively using otherwise wasted volume for energy storage without compromising structural integrity or payload capacity.
Solution Approach 2:
Different regions of the vehicle body are assigned different functions: the outer skin provides structural support and weather protection, while the intermediate space accommodates battery units. This local differentiation allows the hollow space to serve dual purposes - maintaining structural quality while providing energy storage capacity.
3Strength
If the outer skin is made load-bearing to maintain structural integrity, then strength is improved, but manufacturing complexity increases
Solution Approach 1:
The vehicle body is segmented into distinct functional layers: an outer skin for weather protection and aesthetics, and an inner load-bearing structure for structural integrity. This segmentation allows each component to be manufactured independently using optimized processes, reducing overall manufacturing complexity while maintaining strength.
Solution Approach 2:
A non-load-bearing intermediate layer is introduced between the outer skin and the load-bearing structure to accommodate the battery units. This intermediary layer simplifies the manufacturing of the outer skin (which no longer needs to be load-bearing) while the separate load-bearing structure maintains structural integrity, and the intermediate space houses the energy storage system.
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 solution ensures reliable cooling of power semiconductors and coolant pumps, preventing overheating and maintaining safe operation during emergency braking by isolating them from interference signals in the main electrical system.
Implementation Method 1
a linear motor for propelling the vehicle along the guideway
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to an electrically driveable vehicle, in particular a rail vehicle (10), comprising an intermediate DC circuit (40), an in-vehicle, three-phase on-board electrical system (70) fed by the intermediate DC circuit (40), at least one drive motor fed via a converter (80), and at least one coolant pump (100) for pumping a coolant that cools the converter (80). According to the invention, in addition to the in-vehicle three-phase on-board electrical system (70), the vehicle also has a second on-board electrical system (110) and the at least one coolant pump (100) is connected to the second on-board electrical system (110).