Technical Reference – July 17th

Minor changes were made to the rules (technical reference guide) for clarification and validation testing. Includes update to LED indicator.

File: IFEC2019-Technical-Reference_Jul17.pdf

June 17th-

  • Section 14 – Indicator lights are not required when the E-Stop is ON (open).

June 12th – The following changes were made to the Technical reference guide.

  • Section 9.a – Switched throttle connector gender to avoid accidental damage due to misconnection (poka-yoke)
  • Section 14 – Clarified E-Stop Off (closed) vs On (open) description. Eliminated mode c
  • Section 15 – Fuse model specified
  • Section 17 – Temperature protection will not be evaluated
  • Section 23.d – Free Acceleration test is now pass/fail and must achieve 2400rpm in 2 seconds
  • Section 23.e – A 2 min rest period is permitted between each throttle command set (1.5V, 2V, 3V, 4V)

Final Competition Rule Update (April 1st)

IFEC2019-Technical Reference_Apr1_

April 1st Change Log:

  • Removed 5V current spec for Hall sensors
  • Removed 5V current spec for throttle control & display
  • Updated Throttle Command table to scale from 0 to 15Arms
  • Reverted motor external fuse back to 20A (added slow blow description)
  • Removed 15Arms peak battery current limit (no battery ripple current spec)
  • Updated Drive Cycle Test – new name “Efficiency Map” duration to 24 seconds (Hold each point for 2 seconds, no repeated points)
  • Updated Full Load Test – new name “Simulated Hill Climb” and only hold for 30 sec
  • Evaluation criteria will be released by Apr. 15th

 

Previous – March 27th Change Log:

    • Motor phase current increased to 30Arms
    • All cables can be unshielded
    • Throttle Command table updated (Voltage vs RMS Phase Current) and includes error limits. Added Wide Open Throttle (WOT) command for 4.5V.
    • Motor external fuse increased to 50A
    • Maximum continuous battery current of 12A and 15A peak current (definitions include filter settings)
    • Added brake disable input
    • Dynamometer speed controlled with Constant Voltage (CV) load
    • Basic Operation Test added for the Brake State
    • Drive Cycle Test updated
    • Full Load Test Updated
    • Field Test on actual bicycle is defined

Final Competition Rules

THIS DOCUMENT HAS BEEN WITHDRAWN.

IFEC2019 Teams,

The technical reference document has been updated, see the change log below.

https://ifec2019.wiscweb.wisc.edu/documents/technical-reference-march-27th/

We are working on the progress report grading. Results will be released soon. Thank you for your patience.

Change Log:

  • Motor phase current increased to 30Arms
  • All cables can be unshielded
  • Throttle Command table updated (Voltage vs RMS Phase Current) and includes error limits. Added Wide Open Throttle (WOT) command for 4.5V.
  • Motor external fuse increased to 50A
  • Maximum continuous battery current of 12A and 15A peak current (definitions include filter settings)
  • Added brake disable input
  • Dynamometer speed controlled with Constant Voltage (CV) load
  • Basic Operation Test added for the Brake State
  • Drive Cycle Test updated
  • Full Load Test Updated
  • Field Test on actual bicycle is defined

Battery specifications

This document provides the specs for one of the 12V batteries used in the battery pack. Four such batteries are connected in series to make the battery pack. Please use this specifications sheet accordingly.

File: Battery-Specs.pdf

Motor voltage

Are the voltage requirements (0-36V line to neutral) specified as peak value or rms? And are we on the right path, that the given voltage is the sinusoidal fundamental oscillation of the trapezoidal back EMF of one motor coil?

The 0-36V specification is rms value of the fundamental component. These  specifications are ‘nominal’. Depending on the team’s particular control strategy (speed, torque, current, power, MTPA, etc), the voltage fundamental component may be higher or lower. The actual test conditions that will be evaluated will include measurements of voltage and current simultaneously to evaluate the power delivered to the motor.