format unites scientifiques SI

Article_Scientifique/lowtech.tex

@@ -4,7 +4,7 @@
 The basis of this section is the replacement of components who are highly complex, technical and/or are dependant on global supply chains to manufacture. An additional goal is, as for the preceding section, to make a repairable, reliable and manufacturable circuit, this time using these more basic components, based on open-source principles. The controller needs to be performant enough to drive one of the two electric motors used on the LaMAD (La Manufacture Autonome Décentralisée) bicycle cargo trailer. %ref moteur qu'utilise lamad
 
 \subsection{Constraints}
-The electric motors used are supplied using 36/48 Volts at 1000 W. This means that the six-step chopper transistors need to be able to supply up to 28 Amperes of current. This is a lot, considering our restrictions. Additionally, the heat will need to be managed, which may be an even bigger challenge than the current.
+The electric motors used are supplied using \SI{36}{\volt} or \SI{48}{\volt} at \SI{1000}{\watt}. This means that the six-step chopper transistors need to be able to supply up to \SI{28}{\ampere} of current. This is a lot, considering our restrictions. Additionally, the heat will need to be managed, which may be an even bigger challenge than the current.
 
 \subsection{Semiconductor facilities in Occitanie}
 The most challenging part of this section is the replacement of semiconductor parts, as these are the most complicated parts to manufacture. Luckily, the city in which the team is located, Toulouse, offers possibilities in semiconductor manufacturing. This may not be a complete list, but the following were identified:
@@ -44,7 +44,7 @@ The AIME is a small research lab located on our campus. Their capabilities and p
 The proposed project was based on their logic transistors, scaled up not in size, but in number. As seen in the table \ref{tab:AIME_capabilities}, one of their small logic transistors has a resistance of:
 
 \begin{equation}
-	R_{DS_{on}} \approx \S{1}{\kilo\ohm}
+	R_{DS_{on}} \approx \SI{1}{\kilo\ohm}
 \end{equation}
 
 As we need a transistor capable of passing $\SI{28}{\ampere}$ of current, this resistance is unacceptable. Therefore, they proposed to put a great number of transistors in parallel to reduce $R_{DS_{on}}$, on a big surface to better distribute and dissipate the heat (the heat calculations were not made). We can also note here that AIME does not have packaging technology to dissipate high head loads, which could be resolved using external specialist companies (expensive) or making a very thermally efficient transistor. The current also makes the attachment of wires more complicated, as the general relation (not taking into consideration the skin effect in larger diameters) they gave me gives: