The 2019 International. Future Energy Challenge (IFEC 19)

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Technical Reference Material Updated 28 September 2018 Details in this document supersede other details provided in Call for Proposals and Request For Proposal, and previous updates of this document. The 2019 International Future Energy Challenge (IFEC 19) A student competition sponsored by the The Institute of Electrical and Electronics Engineers (IEEE)

Competition Topic: E-Drive for a Bicycle Updated 28 September 2018 This document is intended to provide an overview of the technical requirements for the design, realization and testing of the prototype e-drive for an electric bicycle. The document is intended to be a reference guide to provide a frame of reference for the competing teams to stay within a set of common guidelines and use their creative and innovative skills to meet the challenge. It is a live and working document that may be updated when new questions arise and we develop additional guidelines. All updates will be posted on the website for the competition. When a particular question is not addressed in the guideline, you are free to make suitable assumptions. You are of course welcome to pose your question to the technical team who can provide clarifications. 1. Each team will have to submit a design proposal outlined under item 23 in this document. Selected finalist teams will have to present their hardware prototype for the final challenge competition. The team will have to bring only their e-drive hardware prototype for performance testing to the competition. Battery, motor, bicycle, test-gear and mounting details will be provided at the competition. 2. Continuous power rating: 500W 3. Battery model number: SLA 48V 9AH battery, Product code: BAT489. Available at: https://www.ebikekit.com/collections/batteries/products/sla-48v- 9ah?variant=27965742534, with Anderson power pole connector and charger. 4. Motor model: Available at: https://lunacycle.com/cyclone-mid-drive-ebike-motor-with-freewheelsprocket/, standard 171.5mm long version and not the 205mm long. version. 5. Motor nominal ratings: Notice that these are nominal ratings. Motor operating conditions may be these ratings during transient and dynamic conditions. Extended continuous and sustained operation outside these ratings will lead to increased temperature rise and should be avoided. a. Voltage: 0-60 V fundamental component rms line-line IFEC 19 - The 2019 International Future Energy Challenge 2

b. Current: 0-5 A fundamental component rms per line c. Frequency: 0-300 Hz 6. Power connector to battery a. Anderson power pole connector (Model number TBD) b. Red, Black color terminals to be stacked in the same order c. Red corresponds to + terminal of battery d. Black corresponds to terminal of the battery e. Battery power cable (25A, 120V dc min rating) 30cm-35cm long 7. Power connector to the motor a. 3-terminal Anderson Connector (Model number TBD) b. Red, Yellow and Blue color terminals to be stacked in the same order c. Terminals should connect to corresponding motor terminal wires of the same color. d. Motor power cable (Gauge TBD) 30cm-35cm long 8. Signal connector to the motor a. 5-terminal connector (Mode number TBD) b. 5-wire shielded signal cable (Gauge TBD) 30cm-35cm long c. Connection pins i. 1: 5V ii. 2: 0v-ref (should be internally connected to battery negative terminal) iii. 3: Hall sensor red iv. 4: Hall sensor yellow v. 5: Hall sensor blue 9. Signal connector to the control a. Male 5-terminal Molex Connector (Model number TBD) b. 5-wire shielded control signal cable (Gauge TBD) 90cm-100 cm long IFEC 19 - The 2019 International Future Energy Challenge 3

c. Connection pin numbers i. 1: 5V ii. 2: 0v-ref iii. 3: Throttle signal 1. accept 0-5V 2. active 1~4V 3. Speed, torque, motor current or power regulated iv. 4: Enable signal 1. Low off 2. High on 3. Contact not re-bounce protected v. 5: 48V sense for display 10. Inverter semiconductor case hot-spot sense a. Thermocouple (Model number TBD) b. Type J thermocouple wire 90-100 cm 11. Mechanical and mounting details (Figure TBD) a. Waterproof enclosure b. Floating, electrical isolation >250V ac, 50V dc c. Cables and wiring d. Mounting face with a nominally flat surface > x cm y cm e. 4 mounting holes on a (x cm x y cm TBD) rectangle center-center f. Accept M3 10 mm machine screw g. Target weight: 1.5 kg h. Target box volume 1500 cm 3 12. Motor details a. Phase resistance (x W TBD) IFEC 19 - The 2019 International Future Energy Challenge 4

b. Phase inductance (x mh TBD) c. Back-emf waveform at (30 Hz, 300Hz TBD) d. Motor number of pole pairs: 6 e. Shaft integrated planetary gear speed reduction ratio: 1:6 f. Motor shaft equipped with ratcheted freewheel to prevent wheel or pedal driving the motor g. Gearbox removed for dynamometer testing 13. Throttle control details a. 1V: 0A dc b. 4V: 10A dc c. Linearly interpolated between 1V and 4V 14. Control modes and indication (RGB LED) a. E-stop off, Throttle position don t-care: idle mode: green b. E-stop on, Throttle <1V: ready mode: flashing green @~1Hz c. E-stop on, Throttle 1~4V: ready mode: steady PWM green @~50Hz d. Signal cables absent or signals inappropriate: flashing red @~1Hz e. Protection events under fault; Steady red f. Fault reset: Throttle back to 0V, E-stop turned off and turned on again 15. Over-current a. Motor nominal line current 15A rms b. Motor external fuse: 20A (Model number TBD) c. Battery continuous current 15A d. DC input external fuse continuous 20A (Model number TBD) 16. Voltage a. Overvoltage withstand up to 60V (for x ms TBD) b. Undervoltage cut-out at 44V (respond within x ms TBD) IFEC 19 - The 2019 International Future Energy Challenge 5

17. Temperature a. Thermal cut-out 40 o C hot-spot temperature rise, at 25 o C ambient (respond within x ms TBD) 18. Over-speed limit: x rpm TBD 19. Safety: a. No live electrical elements are to be exposed when the unit is fully configured. The system is intended for safe, routine use by non-technical customers. 20. Thermal consideration: Case should be touch-safe for prolonged operation (<48 o C) 21. Cooling: Natural convection. 22. Prototype hardware test conditions a. The final test will be carried out at the University of Wisconsin-Madison, USA. b. Back to back motor-generator dynamometer test-stand i. DUT kept in a 25 o C temperature chamber ii. Generator output rectified to dc bus iii. DC electronic load (0, 100, 200, 300, 400, 500W) c. Cable and connector integrity (pull-test TBD) d. Hi-pot test (voltage withstand TBD) between mounting face and electrical terminals e. Power up test i. All cable assemblies completed, idle state <1mA sustained average current when e-stop is off, motor shaft free to rotate ii. Quiescent state <50mA sustained average current when e-stop is on and throttle <1V, motor terminals are short circuited in non-regenerative brake mode iii. E-Stop and status indication functionality f. Free acceleration test i. Open circuit electrical load IFEC 19 - The 2019 International Future Energy Challenge 6

ii. Time to reach X rpm TBD iii. Enter fault mode g. Loaded acceleration test i. 500W electrical load ii. Maximum speed iii. Time to reach max rpm TBD iv. Enter fault and protection mode(s) h. Drive cycle and range performance test i. 10-minute drive cycle ii. 5 output load settings (1 minute at each setting) iii. 5 throttle settings 1. 12 seconds each at 1V, 2.5V, 3V, 3.5V, 4V throttle signal input 2. 5-minute ramp-up and 5-minute ramp-down iv. Input electrical power, output electrical power and mechanical output power measured on dynamometer test-stand v. Input energy consumed and output distance traveled (calculated from speed measurement) i. Field test on actual bicycle TBD 23. Design proposal (PDF file submission upload details TBD) a. Not more than 25 pages and 11-point Times New Roman Font, including all the figures, charts, references, charts, etc. b. Information page (On-line entry details TBD) c. Letter of support (On-line upload details TBD) d. Narrative document: i. Introduction ii. Overall block diagram iii. Circuit topology IFEC 19 - The 2019 International Future Energy Challenge 7

iv. Controller 1. Block diagram 2. Hardware realization 3. Software flow-chart v. Design/Analysis 1. Power circuit components (including gate drives) 2. Losses, efficiency and thermal analysis 3. Sensing, control, interface hardware vi. Time-domain simulation results, including ideal switch model for the inverter, block-diagram level controller for the system, electromechanical model for the motor showing steady state waveforms at 250W motor output power, over two electrical cycles of the output waveforms illustrating 1. Battery current 2. Motor currents 3. Motor voltages 4. Motor electrical speed 5. Motor electrical torque vii. Cost: Bill of materials cost information for production of 1000 units, using the price information on http://www.digikey.com/. viii. Mechanical design details IFEC 19 - The 2019 International Future Energy Challenge 8

ATTACHMENT I NAME OF UNIVERSITY: 2019 INTERNATIONAL FUTURE ENERGY CHALLENGE PRELIMINARY TEAM INFORMATION FORM TO BE ENTERED ON-LINE Submit with Proposal CORRESPONDING ADDRESS (PLEASE INCLUDE NAME): TELPHONE: FAX: EMAIL: FACULTY ADVISOR(S): Name Department E-Mail PRELIMINARY TEAM MEMBERS: Name Major Field of Study Degree and Expected Graduation Date IFEC 19 - The 2019 International Future Energy Challenge 9

ATTACHMENT II LETTER OF SUPPORT To be uploaded with Proposal [The letter below is a typical sample and should not simply be copied. Please send a letter with similar content on your university letterhead.] To: Giri Venkataramanan Professor Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison, WI, 53711, USA Ph: 608-262-4479 Fx: 608-62-5559 E-mail: giri@engr.wisc.edu Dear International Future Energy Challenge Coordinator, Our university has organized a student team to participate in the 2019 International Future Energy Challenge. Our proposal is enclosed. A Preliminary Team Participation Form is attached, listing our contact person, the faculty advisor(s), and some of the students who plan to be involved. The team will keep an eye on the Energy Challenge web site for detailed rules and other information. We understand that we will be notified whether we have been accepted to participate by December 21, 2018. If we are accepted, we agree to have our student team perform the design tasks and prepare the reports and hardware prototypes required for the competition. Our school is prepared to support the team with the following resources: A final year project course, XXX, has been authorized to provide engineering students across several disciplines with the opportunity to include this project in their curricula. Laboratory space has been arranged for this course. A faculty advisor, Prof. XXX, has been identified, and has been formally assigned to teach the project course and to advise the student team as a portion of his/her regular duties. IFEC 19 - The 2019 International Future Energy Challenge 10

A graduate advisor has been identified to help manage the student team and to supervise direct laboratory activity. This student is supported with a Teaching Assistantship, which represents a funding commitment of our university of approximately $X. The student team will be provided with an appropriate level of technician and machine shop support to assist them with package preparation and assembly. This assistance represents a funding commitment of approximately $X, and we consider this as a matching commitment for any in-kind support received from external sponsors. In addition, we will provide limited funds to help secure special parts and equipment, with a total commitment of up to $X. The student team will be encouraged to secure outside sponsorship. Our university strongly supports all these efforts, and will match any outside cash support 1:1 up to an additional total of $X. In the event that our school receives prizes from the competition, we are committed to using approximately X% of this money for scholarships for the student team members. The remainder of the funds will be added to our Team Design Program fund, which supports this and similar projects through sponsorship matching, travel funds for participation in competition events, and other direct costs of large team design projects. In the event that our team creates new inventions in the topic area, our university also provides the possibility of assisting with organization of a start-up company. We understand the importance of student team projects in the engineering curriculum and look forward to our participation in the 2018 International Future Energy Challenge. Sincerely, (Head of Department, Dean of Engineering or similar school official) IFEC 19 - The 2019 International Future Energy Challenge 11