critical design review n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Critical Design Review PowerPoint Presentation
Download Presentation
Critical Design Review

Loading in 2 Seconds...

play fullscreen
1 / 27
vala

Critical Design Review - PowerPoint PPT Presentation

0 Views
Download Presentation
Critical Design Review
An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Critical Design Review MACH 1/7 Daniel Bressan David Tran Robbie Banks Amit Kapoor

  2. Overview • Produce an awesome workable RC car from scratch • Top speeds of over 100 mph • Program GUI interface to control the car from laptop • Design mechanical chassis and shell for car David Tran

  3. Target Goals • Low: Function Car • Using ECS pre-programmed chip • Driving, with GUI and 900MHz RF • Low end (cutting board) Chassis • Mid: 30-50 MPH • Gate drivers working • High: 100+ MPH • Build own Chassis and Shell David Tran

  4. The Plan v2.0 David Tran

  5. Input • We will build a GUI interface to control the car. • Mouse • Keyboard • Input: • Power from wall • RS-232 Signal for speed • Output: • RS-232 Signal to CPU to control speed and steering • Will start coding as soon as PCB is ordered Amit Kapoor

  6. RF System • Not much changed since PDR • Xtend PKG - 900 MHz • Tested and working Amit Kapoor

  7. Micro Controller David Tran

  8. MSP430 • MSP430-F2616 • Inputs Tx/Rx and digital optical encoder information • Outputs PWM for servo and PWMs for gate driver • MAX232 • Interprets RS-232 signal David Tran

  9. PWM for Sinusoids/Servo • User timers and DAC to generate sinusoid • Pulse widths from sin table • Servo Control David Tran

  10. Power System Daniel Bressan

  11. Power System Daniel Bressan

  12. Power • LiPo 3 cell 11.1 V • Powers motors and everything isolated on that side • LiPo 4 cell 14.8 V • Regulated for: • 3.3 V TLV-1117 33 • 5 V TLV-1117 50 • 9 V LM2940 9.0 Daniel Bressan

  13. Power – Level 2 • 14.8 V, 1Ah LiPo regulated for: • 3.3 V MSP430 • 5 V • Optical Encoder • Max 232 • 9 V RF • 11.1V, 5Ah LiPo Motor side • 5 V • Optoisolater VO0630T (right) • DC motor for Gyroscope • Servo • Transistors Daniel Bressan

  14. Control • Speed Encoders • US Digtial E5 • 32 CPR (cycles per revolution) • Max RPM 60,000 • Sensors • NONE! • Threw out inclinometer and force sensor ideas • Steering • Pre-Built Servo • PWM • Gyroscope Daniel Bressan

  15. Motor – Mamba Monster • Takes three PWM inputs • Max RPM of 60 kHz • Four pole motor • Max input frequency 2kHz • RPMs can be calculated as follows RPM = 120 * f/p p = poles • With our wheels and rotational speed we could achieve a velocity of 700 MPH Robbie Banks

  16. Torque Curves • Constant torque up to the rated frequency • Can go past rated frequency but lose torque Robbie Banks

  17. Motor Driver • Dual Channel Opto-Isolators • Gate Driver • Triple Half-Bridge Driver Robbie Banks

  18. Motor Driver Robbie Banks

  19. Opto-Isolators – VO0630T • Using Opto-Isolator for separation • Powered by a regulator connected to the motor power supply • Takes PWM inputs from microcontroller • Digital Opto-Isolator high-low threshold of .8V • Rise time of 23ns and Fall time of 7ns • Max frequency of 33.3MHz Robbie Banks

  20. Gate Driver – HIP4086 • Three PWM inputs • Amplifies PWM inputs • Dead time setting to prevent shoot through • Disable input signal • Six output signals, three high and three low • Powered directly by the three cell 11.1V LiPo battery Robbie Banks

  21. Triple Half Bridge Driver • Uses six AUIRL1404ZS MOSFETS • High Power NMOS transistors • Continuous drain current of 160A • VGS of 10V • Each source on the MOSFET is connected to the gate driver to ensure a VGS of at least 10V • Powered directly from the three cell 11.1V LiPo battery Robbie Banks

  22. Mechanical • For testing and low level design: • Kitchen cutting board chassis • High level design (after machine shop training): • Chassis and Shell possibly out of acrylic. • ITLL has an acrylic cutter • Will start full designs after PCB is ordered this week Robbie Banks

  23. Division of Labor • Main Changes: • David: mostly software, getting PWMs to work properly • Amit: Learning and teaching us Altium, and software with David • Robbie: Gate Driver and Power • Daniel: Power, and other simple components, helping Robbie Amit Kapoor

  24. Schedule • Changes to Schedule: • Behind on ordering PCB (should finish this week) • Behind on programming GUI, will start as soon as PCB is ordered • Ahead of schedule for gate driver Amit Kapoor

  25. BudgetUsed so far (Parts List) Amit Kapoor

  26. Deliverables • Milestone I • PCB testing (hopefully we’ll have it back) • Working Gate Driver • MSP430 communicating with gate driver • Milestone II • Driving Car • EXPO! • Car going 100+ MPH Amit Kapoor

  27. ANYQUESTIONS? Daniel Bressan