Gyroscopic Boat Stabilizer Cooling for Fast Flywheel Spin-Up
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Solution Overview
Problem
Existing gyroscopic boat stabilization systems face challenges with heat buildup in bearings and slow spin-up/spin-down times due to inefficient cooling, which limits their effectiveness and durability, especially in shorter boat trips.
Innovation Solution
A gyroscopic roll stabilizer with a motor cooling circuit and bearing cooling system that maintains below-ambient pressure within an enclosure, using a closed fluid pathway to recirculate cooling fluid and transfer heat away from the motor and bearings through conduction and convection, allowing for efficient heat dissipation and faster acceleration/deceleration of the flywheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the flywheel is contained in a vacuum enclosure to achieve high spin rate, then the gyroscopic stabilization performance is improved, but heat dissipation becomes problematic
Solution Approach 1:
The system is divided into two separate enclosures: a vacuum enclosure for the flywheel to achieve high spin rate, and a separate cooling system with its own enclosure for heat dissipation. This segmentation allows each subsystem to operate in its optimal environment without compromising the other.
Solution Approach 2:
A thermal intermediary system is introduced between the motor/bearings and the external environment. This includes cooling fluid channels that transfer heat from the motor and bearings to a heat exchanger, which then dissipates heat to the external environment. The intermediary cooling system enables heat dissipation without compromising the vacuum enclosure.
2Temperature
If traditional cooling systems are used for the motor and bearings, then heat dissipation is achieved, but the spin-up time becomes excessively long
Solution Approach 1:
The cooling system parameters are optimized by using a closed-loop fluid circulation system with high thermal conductivity channels. The cooling fluid flow rate, channel geometry, and heat exchanger surface area are specifically designed to maximize heat transfer efficiency, enabling rapid temperature control during spin-up and spin-down operations.
3Use of energy by moving object
If the flywheel spins down completely, then energy consumption is reduced, but noise and vibration persist for hours
Solution Approach 1:
The braking process is converted from a harmful noise-generating event into a controlled energy dissipation process. The electromagnetic brake applies controlled friction to the flywheel, converting its kinetic energy into heat that is rapidly removed by the cooling system. This controlled braking reduces noise and vibration while the cooling system manages the generated heat.
4Reliability
If bearing temperature is reduced through better cooling, then bearing life is extended, but system complexity increases
Solution Approach 1:
The motor cooling and bearing cooling systems are merged into a single integrated thermal management system. Both the motor and bearings are thermally coupled to the same cooling fluid circulation system, which shares common components such as the pump, reservoir, and heat exchanger. This integration reduces overall system complexity while providing effective cooling to all heat-generating components.
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 enables faster spin-up and spin-down times, reduces noise and vibration, and extends the lifespan of the system by managing heat effectively, making it suitable for a wider range of boating occasions, including shorter trips.
Implementation Method 1
transfer heat away from the motor to the cooling fluid
Implementation Method 2
transfer heat away from the motor by conduction and convection to a cooling fluid flowing through a fluid channel
Implementation Method 3
The cooling fluid may also flow through a fluid channel that contacts the bearings, thereby cooling the bearings
Implementation Method 4
A control moment gyroscope (CMG) is mounted in the boat and generates a torque that can be used to counteract the rolling motion of the boat. The CMG includes a flywheel that spins at a high speed
Implementation Method 5
The energy used to counteract the rolling motion of the boat comes from the angular momentum of the rotation of the flywheel at a high rate of speed
Implementation Method 6
The flywheel is typically mounted inside an enclosure for safety reasons. In order to obtain the high spin rate, the flywheel is typically contained in a vacuum enclosure
Data Source
AI summary
A gyroscopic roll stabilizer for a boat includes an enclosure mounted to a gimbal for rotation about a gimbal axis and configured to maintain a below-ambient pressure, and a flywheel assembly including a flywheel and flywheel shaft, with the flywheel assembly rotatably mounted inside the enclosure for rotation about a flywheel axis. The gyroscopic roll stabilizer also includes a motor operative to rotate the flywheel assembly and disposed inside the enclosure. A motor cooling circuit is configured to transfer heat away from the motor. The motor cooling circuit has a closed fluid pathway for recirculating cooling fluid therein. The fluid pathway includes a fluid channel jointly defined by the motor and the enclosure and having the cooling fluid therein. The gyroscopic roll stabilizer is configured to transfer heat away from the motor to the cooling fluid. Related methods are also disclosed.