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The powered reel
The powered reel
The mechanical design of the powered reel consists of 6 main components. The drum, level wind, drive train, frame, and electrical box. Each component’s mechanical design is described in the following sections.
The drum
The drum
Notable features of the design include a two-piece drum, a sealed shaft on the motor side to prevent leaks into the motor box and bearings on both sides to allow the drum to freely rotate. This drum holds 20m of Tether and can pull the weight of the ROV.
The LevelWind
The LevelWind
The purpose of the level wind mechanism is to ensure the cable gets tightly and safely wound on to the drum. It does this by moving back and forth and guiding the cable along the surface of the drum.
It uses a lead screw to move the pulleys back and forth.
The Frame
The Frame
The frame of the system is the simplest component. It consists of 2 bent aluminum 5052 plates that support the level wind and drum. Aluminum 5052 was selected for its easy formability, corrosion resistance and lower density.
It also has a large 3D printed enclosure that bolts down to the side plate that holds the motor plate and seals the motors. This piece is 3D printed to help reduce the water weight of the system and keep manufacturing costs down.
The Electrical Box
The Electrical Box
The electrical box is the final component of the assembly. This is an off the shelf box that will have additional holes for strain reliefs added. This will allow the box to be properly sealed while passing in electrical connections
The Drive Train
The Drive Train
The drive train consists of a 2 gear reduction. This allows the max torque desired on the system to be achieved.
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