Subsystem Build & Test
Table of Contents
Team Vision for Subsystem Level Build & Test Phase
All subsystems being tested. The motor output as a generator and having the turbines spun. The magnetic couplings will be tested at various distances and various number of magnets. The underwater housing will be verified that it is waterproof.
The electrical connector is tested to verify that it is waterproof. The underwater housing is created, and a manufacture plan is set. The first iteration of the blade is 3D printed. The magnet test is planned.
Test Results Summary
Magnetic Coupling TestFour iterations of the coupling magnets are verified for functionality. The four iterations include 12, 10, 8, and 6 magnet couplings. The different amount of magnets and the different spacing values are tested to find the amount of torque required to separate the two plates to become out of sync. This value will be used to ensure that the couplings will reliably turn the motor.
Magnetic Coupling Test Setup
Magnetic Coupling Test Results
|Distance [in]||12 Magnets Torque [Nm]||10 Magnets Torque [Nm]||8 Magnets Torque [Nm]||6 Magnets Torque [Nm]|
DC Motor Testing Specification
|Specification Number||Importance||Source||Function||Unit of Measure||Marginal Value||Ideal Value||Comments/Status|
|DC1||9||Hankscraft DC Motor||Generator||Power [W]||2-5 [W]||4 [W]||Voltage drop to zero with DC-DC|
|DC2||9||DC Servo Motor||Generator||Power [W]||2-5 [W]||4 [W]||1 Volt output when tested with the system|
|DC3||9||RIYIN DC Motor||Generator||Power [W]||2-5 [W]||4 [W]||Greater than 300 RPM required [45% voltage drop with system]|
RIYIN DC Motor Testing ResultsThe DC3 meant engineering requirement, at a required RPM greater than 300 RPM. The Voltage of the DC3 motor can be determine using the following equations at a given RPM. V = 0.0268RPM - 0.2768. Please Note, with a 45% voltage drop when connected to the system.
HousingMany housing iterations were 3D printed to verify the spacing and to ensure all the components would fit as intended before machining the final housing. The final prototype housing is made of PVC and is shown on the left. PVC was chosen because it is waterproof, where the 3D prints are less reliably waterproof. PVC primer and cement is used to join the different PVC parts.
The inside of the housing will hold the motor and the electrical wires. The slot where the O-ring is also visible in this photo. The O-ring is used as a waterproofing measure.