Team Vision for Detailed Design Phase
Our team planned to create a working first prototype of the selected detailed design. This includes selecting a motor that provides sufficient current and voltage, while also at an appropriate weight. A first blade design is tested to better understand how to make efficient blades to turn the desired motor. A set of coupling magnets are purchased and tested. Waterproofing components and designs are tested.
A motor has been selected, DC Servo Motor, to start system integration testing. A set of couplings magnets have been made, because purchasing pre-made magnets was more expensive. This involved a 3D printed disk to house the magnets, and securing the magnets with glue and resign. A component has been purchased that will allow for a waterproof connection at the point where the wires from the motor will exit the housing. Wire with two conductors has also been ordered to connect the motor to the out-of-water USB connection. Housing design for both housings has been started. Blade design 3D modeling has been started.
Progress ReportAccomplished so far: Motor selected Magnets created Underwater housing prototype Overall system design (offshore, and underwater) First prototype of blade printed Electrical schematic
1. Acquire all materials and the assembly described above
2. Fill the bucket with water.
3. Place product into the bucket for roughly 10 minutes
4. Dry the outside of the housing and review the indicating paper in
5. Put assembled test specimen into the water and let it stay there for ~ 1 hours.
Results are visualized and needs to be recorded with pictures.
- The purpose of this test is to determine the appropriate DC motor to achieved both engineering and customer requirement for a USB charge standard output specification as shown in the table below.
- Motors act as a generator when a mechanical input (torque) applied, an EMF is induced, Current to start the armature turning will flow in the direction determined by the applied DC power source. The EMF that is induced (counter-electromotive force, or CEMF) in the armature will produced a current in the opposite direction.
- Test bench Setup
ResultsTest Result document
- The test was done by varying the RPM while one of the DC motors is driving the other as a generator. The RPM varies by changing the input voltage of the DC motor that is driving the generator. The Veeder_Root Hand Tachometer was used to measure the RPM of the generator.
- The DC Servo Motor outperform the two other motors. With the DC servo, we are guaranteeing to get from the DC Servo motor 3 watts to 8 watts from 400 rpm to 800 rpm. The DC Servo motor has less torque and weight 1.6 lb. The armature resistance and inductance of the DC Servo motor are 7.97 ohms and 2.96 mH respectively