Torque Converter Lock-Up Mechanism for Synchronization
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Solution Overview
Problem
Starting a large compressor driven by a gas turbine while maintaining synchronization with the rotating driver is challenging, as conventional methods require decoupling and recoupling, which is inefficient and costly due to the need for powerful starter motors.
Innovation Solution
A system utilizing a torque converter, specifically a fluid coupling with a lock-up mechanism, that allows for sequential modes of operation including a free-wheel mode, torque-transmitting mode, and mechanically-locked mode, assisted by a smaller motor to synchronize rotational speeds, reducing the need for powerful starter motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a powerful starter motor is used to bring the load up to operating speed, then the load can be mechanically coupled to the driver, but the cost and complexity of the system increases significantly
Solution Approach 1:
The startup process is divided into distinct phases: initially the torque converter operates in fluid coupling mode to allow the driver to reach operating speed, then a lock-up mechanism is engaged to mechanically couple the driver and load. This segmentation allows each component to perform its function optimally without requiring an oversized starter motor.
Solution Approach 2:
The torque converter acts as an intermediary between the driver and load during startup. It allows slip between the driver and load during the acceleration phase, enabling the driver to reach operating speed without being mechanically constrained by the load, thereby eliminating the need for a powerful starter motor.
2Speed
If the load is decoupled from the driver during start-up and then recoupled, then the driver can reach normal operating speed, but the process is inefficient and requires complex mechanical coupling mechanisms
Solution Approach 1:
The torque converter maintains continuous torque transmission from the driver to the load throughout the entire startup process. The fluid coupling ensures that as the driver accelerates, torque is continuously transmitted to accelerate the load, eliminating interruptions and improving startup efficiency.
Solution Approach 2:
The coupling between driver and load transitions dynamically from fluid coupling (allowing slip) to mechanical locking (no slip). This dynamic transition is controlled by the lock-up mechanism which engages when synchronization is achieved, optimizing performance at different stages of startup.
3Productivity
If mechanical locking is used to couple the load to the driver at full speed, then direct drive is achieved, but abrupt coupling causes mechanical shock and potential damage
Solution Approach 1:
The system performs preliminary synchronization of rotational speeds between driver and load before engaging the lock-up mechanism. This preliminary action ensures that when mechanical coupling occurs, there is minimal speed differential, preventing mechanical shock and potential damage to the coupling mechanism.
Solution Approach 2:
The torque converter provides a cushioning effect during the transition to mechanical coupling. The fluid coupling absorbs and dampens any residual speed differences or shocks before the lock-up mechanism engages, protecting the mechanical components from damage.
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
Enables efficient startup and operation of large rotational loads by minimizing rotational slippage and reducing the power requirements of the motor needed for synchronization, allowing for smaller, less expensive motor solutions while maintaining high operational efficiency.
Implementation Method 1
A torque converter, such as a fluid coupling with a lock-up mechanism
Implementation Method 2
minimizing rotational slippage
Data Source
AI summary
A system employing a torque converter (10) and a synchronizing motor (42) to start up a large rotational driver/load combination (20, 22). The torque converter is employed to increase the rotational speed of the load to the maximum speed permitted by the torque converter. The synchronizing motor is then employed to further increase the rotational speed of the load to substantially match the rotational speed of the driver