Integrated Reduction Gear for Hybrid Train Speed and Torque Matching
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Solution Overview
Problem
Hybrid train systems face challenges in torque transmission due to mismatched operating speeds between gas turbines and electric machines, leading to overdesign, increased costs, weight, and footprint, along with rotor-dynamic limitations and coupling issues.
Innovation Solution
Integration of an integrated reduction gear unit that adapts the operating speed range of the electric machine to match that of the gas turbine, using an epicyclical type gear to transmit torque bi-directionally, and inclusion of a torque limiter device to manage excess torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electric machine is overdesigned to match the gas turbine speed range, then torque compatibility is improved, but weight, cost, and footprint increase
Solution Approach 1:
A speed adaptation device is introduced as an intermediary component between the electric machine and the gas turbine. This device includes a first transmission shaft connected to the electric machine, a second transmission shaft connected to the gas turbine, and a clutch mechanism that couples or decouples these shafts. The intermediary device enables speed matching without requiring the electric machine to be overdesigned, thereby maintaining torque compatibility while avoiding increased weight.
Solution Approach 2:
The system employs a dynamic clutch mechanism that can transition between coupled and decoupled states. When coupled, the speed adaptation device transmits torque and adapts speeds; when decoupled, the electric machine operates independently. This dynamic configuration allows the system to achieve torque compatibility only when needed, avoiding the permanent weight penalty of an overdesigned electric machine.
2Adaptability or versatility
If a speed adaptation device is added to match operating speeds, then torque transmission is improved, but device complexity increases
Solution Approach 1:
The speed adaptation device is designed to perform multiple functions: it adapts speeds between the electric machine and gas turbine, transmits torque bidirectionally, and provides clutching functionality to couple or decouple the transmission shafts. By consolidating these functions into a single integrated device, the overall system complexity is reduced compared to having separate components for each function.
Solution Approach 2:
The patent combines the speed adaptation mechanism and the clutch mechanism into a single integrated device. The first and second transmission shafts are merged with the clutch assembly, eliminating the need for separate coupling devices. This merging reduces the number of components and simplifies the overall transmission system while maintaining all necessary functionalities.
3Adaptability or versatility
If bidirectional torque transmission is implemented at variable speeds, then operational flexibility is improved, but rotor-dynamic limitations increase
Solution Approach 1:
The clutch mechanism provides dynamic control over torque transmission, allowing the system to switch between coupled and decoupled states based on operational requirements. This dynamic capability enables bidirectional torque transmission at variable speeds while maintaining rotor-dynamic stability by disengaging the transmission when high-speed rotation occurs, preventing excessive dynamic loads on the rotor.
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
Enhances torque compatibility and reduces system footprint, weight, and costs while improving rotor dynamics by adapting speed ranges and managing torque peaks.
Implementation Method 1
an integrated reduction gear unit, such as of epicyclical type, connected to the electric machine unit and to the rotating shaft
Data Source
AI summary
A hybrid train system comprising at least one gas turbine to drive a load, and an electric machine unit, also connected to the load. A clutch is installed between the gas turbine and the load. Also, an integrated reduction gear unit is interposed between the load and the electric machine unit, to adapt to different operating speeds.