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Subsystem Design

Table of Contents 1 Team Vision for Subsystem-Level Design Phase 2 Flow Down to Subsystems 3 Feasibility: Prototyping, Analysis, Simulation 3.1 Current Status 4 Test Plan 4.1 Electrical 4.2 Software 5 Next Level Decomposition 6 Bill of Materials (BOM) 7 Plans for next phase

Team Vision for Subsystem-Level Design Phase

Summarize:

• We have successfully determined the steps and order of which to execute those steps to ensure successful completion of our prototyping, analysis, and finalized design.

Flow Down to Subsystems

Full Flow Down found HERE!

Feasibility: Prototyping, Analysis, Simulation

Current Status

• We are currently unable to get the ORCAD PSpice simulation to work due to the motor component.
• After speaking to Professor Fuller, who alerted us to the fact that no professor would likely be able to help us:
• We have two options, pay to have it designed or begin prototyping.

Test Plan

Electrical

1. Prototype the H-Bridge Circuit on Breadboard
   • Test using power supply signal generator
     • Measure current draw, motor speed (voltage), hall effect position readings
   • Check to see that the effective voltage range of the H-Bridge Gates is within an acceptable limit to power the motor.
     • Make sure these results are repeatable and constant given different environments (temperatures).
2. Attach MCU to Gate Driver
   • 6 signal generators potentially needed, if MCU is unavailable
     • This mimics the pulse width modulation that would otherwise be provided by the MCU
     • Measure current draw, motor speed (voltage), hall effect position readings
   • Send different voltages to gate driver input and see how the output voltages are affected
3. Voltage Regulator can be simulated with a variable power supply
4. Voltage regulator is the last item to be designed and built
   • This is an integrated circuit package
     • That leaves the supporting circuitry to be built around it
     • Prototyping will again be done via the breadboard
       • Voltage input will be from a power supply or actual batteries
       • Then values will be read from a volt meter at the output of the circuit

• Note: If the currents are too great for a breadboard the components drawing that high current will be jumper cabled off of the breadboard

Software

1. Hook up launch pad to booster board and small test BLDC motor
   • Tune built in control algorithms to work with the test motor
     • This allows for debugging to be done with a "quick" setup
     • With the peripherals attached this should be a fully working prototype
   • Test CAN hardware on micro controller
     • Attach micro controller to CAN test equipment to ensure hardware can transmit and receive correctly
   • Test ADC hardware on micro controller
     • Test and calibrate ADC with sensors to ensure hardware can sample at the frequency and resolution required
   • Test frequency and phase calculation algorithms
     • Write unit tests to ensure that frequency and phase algorithms work for all use cases
   • Test torque calculation algorithms
     • Write unit tests to ensure that torque algorithms work for all use cases and inputs
   • Test output stage algorithms
     • Write unit tests to ensure that the output algorithm stage works for all use cases

Next Level Decomposition

Bill of Materials (BOM)

Plans for next phase

• By week 12 we hope to have working simulations/mock ups working for both the electrical systems and the MCU.

• This should be straight forward and obtainable.

• Organization is key to accomplishing this task by then. We must stay on top of our part ordering.

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