Detailed design review

1. P12026: Transcutaneous Power Transmission Detailed design review Team Members Nooreldin Amer Michael Carozzoni William Chan Naveen George Devin Prescott Paul Slagle

2. Presentation Outline • Project Description • Review of Customer Needs, Engineering Specifications, and House of Quality • Power Circuit for Motor • Armature/Motor Casing CAD • Receiver/Generator Casing CAD • Generator Selection • Power Transmission Test Data • Rectifier Circuit • Review of Risks • System Interface • Bill of Materials • MSD II Quarter Schedule

3. Project Description • Team 12026 is currently researching and developing a module for transcutaneous (through the skin) power transmission. Our project involves the transmission of power through a gap using passive magnetic coupling. This unit has potential as a medical device, and is intended as a proof-of-concept for future application in ventricular assist devices (VAD).

4. Customer Needs

5. Engineering Specifications

6. House of Quality

7. Power Circuit

8. Test Bench

9. Parallax BASIC Stamp 2 Module • On-board flash • Vin of 5.5V to 15V • Cheaper than the ArduinoMicrocontroller • Current members experienced in programming

10. Sample BASIC Code • ' {$STAMP BS2} • ' {$PBASIC 2.5} • FOR counter = 1 TO 50 %start up gradual speed PULSOUT 13, 150 PAUSE 20NEXT • FOR counter = 1 TO 50 %start up gradual speed PULSOUT 13, 250 PAUSE 20NEXT • FOR counter = 1 TO 50 %start up gradual speed PULSOUT 13, 350 PAUSE 20NEXT • FOR counter = 1 TO 50 %start up gradual speed PULSOUT 13, 450 PAUSE 20NEXT • DO • PULSOUT 13, 650 %Full speed • PAUSE 20 • LOOP • END

11. DK-LM3S-DRV8312 After comparing the DRV8312 to the Phoenix Motor Controller from Castle Creations, the DRV8312 has more options and better headroom with supply voltages up to 50V. This also has a higher PWM operating frequency of up to 500 kHz. This is a more robust controller and a better fit.

12. CaseMaterial PVC Material Properties

13. Outside Sub Assembly Preliminary Model Length: 2in OD: 3in Weight: 0.75lb Max RPM: 9390 Number of Magnets: 6 Motor (Blue): EC-i 40 Brushless Outside Shell(Red/Yellow): PVC Shaft Mount (Green): Aluminum Armature (Orange): PVC Magnets (black/red): Neodymium Motor Mount (Grey): PVC

14. ANSYS Simulation Armature/Receiver RPM: 20000 Material: PVC Max Stress (12 Mag)=8.72 MPa (Pass) Max Stress (6 Mag)= 8.88 Mpa (Pass)

15. Receiver CAD Model Height: 35.5 mm [1.4 in] Diameter: 76.2 mm [3 in] Gear Ratio: 3.09:1, 30mm Pitch Helix Epoxy Sealed, USP Class VI

16. Receiver CAD Model

17. Receiver CAD Model

18. Receiver CAD Model

19. Tooth Profile

20. Receiver CAD Model

21. Receiver Sealing

22. Motor Efficiency

23. Generator Efficiency

24. MATLAB Implementation

25. MATLAB (cont’d)

26. MATLAB (cont’d)

27. MATLAB (cont’d)

28. Generator Selection • Maxon EC22, brushless, 100 Watts, sterilizable • Chosen for • Operating point at 8.07 mNm and 45098 rpm • Low heat dissipation (0.56 W @155°C) • High power output (31 W @155°C) • High operating speed (max. 60,000 rpm) • High max. ambient and max. permissible winding temperature (135°C and 155°C, respectively)

29. Generator Comparison

30. Magnetic Simulations

31. Armature/Receiver Testing

32. Armature/Receiver Testing

33. Three Phase Rectifier Circuit

34. Three Phase Rectifier Output Waveform

35. Output Voltage Regulator

36. Combination of Rectifier and Voltage Regulator

37. Review of Risks

38. Interface with 12022 • Final dimensions of generator and motor from 12026 (housing) • 12026 provides 2 interior thermocouples and provides access to them • 12026 provides hall effect sensors and provides access to them • 12022 provides power to the hall effect sensors and generator side.  • 12026 provides access to measure on both input and output

39. Interface with 12022

40. Bill of Materials

41. Purchasing

42. Schedule for MSD II