1. What is the capacity of the accumulator? * 2. In order to increase the capacity of...
Question:
1. What is the capacity of the accumulator? *
2. In order to increase the capacity of our accumulator, eachseries cell has 3 additional cells wired in parallel to it; thisresults in our accumulator containing 576 cells wired in a 144S4Pconfiguration.Each cell has a capacity of 2.5Ah.
3. How much energy (kilowatt.hours) does our accumulator have? * At competition, the energy usage of our electric vehicle ismeasured to calculate its efficiency over a 22km race.
4. Provide at least 3 reasons why you think we made thisdecision. * In 2015 and 2016, we used LiPo Pouch cells yet in 2017& 2018 we made the decision to use Li-Ion 18650 cells.
Question 2 All electric vehicles have a motor controller, thisis essentially an inverter which turns the DC input into a PWMoutput. The motorcontroller we use is the UnitekBAMOCAR-D3-700-400.The bus circuit capacitor of a motor controllerhas a high capacitance; if this capacitor is not pre-charged beforebeing energised with the full accumulator voltage it willcatastrophically explode.
a) Why will the capacitor explode? * HINT: what cannot changeinstantaneously across a capacitor?
b)List the rules regarding the pre-charge circuit. *
c)Using this rule, what value of resistance will charge thecapacitor to at least 540V after 5 seconds? Assume accumulatorvoltage is 600V. * HINT: you will need to find out the value of thecapacitor within the motor controller, consult the manual.
d)What voltage must the motor controller be discharged to within5 seconds of de-energising? *
Operations Management Processes and Supply Chains
ISBN: 978-0132807395
10th edition
Authors: Lee J. Krajewski, Larry P. Ritzman, Manoj K. Malhotra