questions for understanding problem 1

Hello, I cannot make sure what 'force of drag on vehicle' and 'force of friction on vehicle' exactly means.
Does the 'force of drag on vehicle' mean all the force applies on the vehicle to make the vehicle to stop? Or, to drive the vehicle?
Does the 'force of friction on vehicle' just mean the rolling resistance?
Thanks.

units for flux linkage

Hi, just a small question regarding the units for flux linkage: In past lives, I've used Ke instead of flux linkage to compute bemf voltage for a given eletrical frequency.  The units for Ke were V*sec/rad (sometimes I have seen V*sec/Hz).  On the final exam #1, I see units for flux linkage to be labeled as 'Vs'.  Is this a typo?

Max. Voltage amplitude during operation on the drive cycle

In Question 1, part a) we are asked to determine the maximum voltage amplitude Vs during operation on the drive cycle.

Do we need to account for the transients also. I see that the during initial acceleration & also during final braking, the amplitude Vs is higher than in the steady state.


Krishna

Editing EV Library Blocks in Simulink

All --

We have received some questions on editing blocks which are tied to the EV library.  In order to do so, you must unlock the links to the library, then disable the links.  This can be accomplished in the following way:

To disable a block’s library link:

1.       In the library choose edit -> unlock library

2.       In the library choose edit -> unlock links to library

3.       In the simulation file, right-click the block and select “disable link”

This will allow you to edit the internals of a block from the library.  To completely remove the block’s association with the library, do the following in addition to the above:

4.       In the simulation file, right-click the block and select “break link”

These instructions pertain to Matlab 2011.  In Matlab 2012, the exact location of the menu items is slightly different, but the same steps should be taken.

For HW12, Prob. 2

In Prob. 2, what is Vref of boost converter? use a dynamic Vref which is modified in Prob. 1 or constant Vref?

EVModel_Week13 Error

I tried to run the vehicle model in Matlab R2012b. I got a series of errors about not having a C compiler for Matlab and build errors with the library. I installed Microsoft Windows SDK version 7.1. This corrected the C compiler problem, but the vehicle model will still not run and the library fails to build. The same problem occurs with Matlab R2011b which I have been using error free for all previous assignments. The error messages I get are below:

If anyone has a solution or more experience fixing these kind of errors, I would appreciate any help. Thanks.
- KT

HW 11 - problem 1

Can we assume that the resistance of the stator winding (100 turns) is 0 Ohm?
Thank you.