Rail Vehicle Drive System Kinetic Energy Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drive systems for rail vehicles face challenges in reliably cooling traction motors and current converters, especially in car locomotives where air cooling is not feasible, leading to overheating due to eddy and hysteresis losses, and asynchronous machines generate additional losses during operation.
Innovation Solution
A drive system that utilizes the kinetic energy of the rail vehicle to operate a cooling apparatus, converting motion energy into electrical or hydraulic energy for cooling, independent of other energy sources, using a generator or hydraulic pump connected to a fan or fluid cooling system, allowing for efficient cooling of drive motors and current converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If self-ventilated motors are used for cooling, then the cooling is simple to implement, but the cooling is not reliable when installation space is limited and air cooling is not possible
Solution Approach 1:
The patent replaces the electrical fan system with a hydraulic cooling system that uses the vehicle's motion to drive a hydraulic pump, which then drives a cooling fan. This mechanical-hydraulic substitution provides more reliable cooling without requiring additional electrical power sources, directly addressing the reliability issue while maintaining implementation simplicity.
Solution Approach 2:
The cooling system is designed to be self-powered through the hydraulic pump that is driven by the vehicle's motion (via the bull gear). The system uses the vehicle's own kinetic energy to generate the cooling effect, eliminating dependence on external electrical power sources and improving reliability in space-constrained applications.
2Power
If permanent magnet-excited traction motors are used in car locomotives, then the motors provide effective drive capability, but the motors generate eddy current and hysteresis losses that require reliable heat dissipation
Solution Approach 1:
The patent converts the harmful thermal energy (heat) generated by eddy current and hysteresis losses into a useful cooling effect. The hydraulic cooling system captures the heat and dissipates it through the vehicle's motion-driven cooling apparatus, transforming the energy loss into a functional cooling mechanism that benefits the overall system.
Solution Approach 2:
The patent employs a hydraulic cooling system that uses fluid dynamics to transfer and dissipate heat from the traction motors. The hydraulic pump, driven by the vehicle's motion, circulates cooling fluid through the motor components, efficiently removing the heat generated by electromagnetic losses while maintaining the motors' high power capability.
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 provides a simple, reliable, and energy-independent cooling method that effectively dissipates heat from traction motors and current converters, reducing overheating and operational losses, while avoiding the disadvantages of asynchronous motors.
Implementation Method 1
the drive system is embodied and intended to use kinetic energy of the rail vehicle for operation of the cooling apparatus
Implementation Method 2
at least one cooling apparatus for cooling the at least one drive motor and/or other components of the drive system
Implementation Method 3
Those losses are mainly eddy current and hysteresis losses in the stator iron of the traction motor, which occur as a consequence of the rotating magnetic field
Implementation Method 4
Those losses are mainly eddy current and hysteresis losses in the stator iron of the traction motor
Data Source
AI summary
A drive system for a rail vehicle includes at least one drive motor and at least one cooling apparatus for cooling the at least one drive motor and/or other components of the drive system, in particular a current converter. The drive system is constructed and intended to use kinetic energy of the rail vehicle for operation of the cooling apparatus. A rail vehicle having the drive system and methods for the forward movement of a rail vehicle are also provided.