Normalizing the dimensions of a DC motor circuit schematic - TeX

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Top Answer

5 years ago user 3.14159

I have basically no experience with circuitikz, so we will have to wait for Rmano’s input. As for the other parts,

By setting x=3em,y=3em, say, you can achieve that things scale with the font size. To demonstrate this, I put the picture twice, and the second time after \Large. (Notice that some things do not change, such as the size of bricks and line widhts. You can change them if you want but generally this is not something that one does.) Presumably one can scale everything by invoking something like scale=2.5em/1cm,transform shape, but this might have downsides so I didn’t try.
You were alreaady pretty good with relative positioning, the only real change is that I placed the wall first such that it aligns with the circuit, and then drew the damper (which I also modified to use em instead of pt and to accept an argument that can be used to place the label).
You have a couple of vertical bars, which are now pics as well.
There are things like Telmech which I kept my claws away from, this is more for squirrels. 🐿 😸

\documentclass[tikz,border=3mm]{standalone}
\usepackage[american, siunitx , RPvoltages]{circuitikz}
\usetikzlibrary{3d,arrows.meta,bending,calc,decorations.markings,patterns,positioning,shapes.geometric}

\tikzset{pics/rotarrow/.style={code={\path (160:0.4) coordinate (tmpex);
 \begin{scope}[local bounding box=tmp,x={(tmpex)},
	canvas is xy plane at z=0]
  \clip (-0.41,-0.41) rectangle (0.41,0.41);
  \pgflowlevelsynccm
  \draw[thin,-{Stealth[bend]}] (-150:0.4) arc[start angle=-150,end
  angle=150,radius=0.4];
\end{scope}
\path (tmp.north) node [above] {\tikzpictext};
}},pics/bar/.style={code={\draw[pic actions] (0,-#1) -- (0,#1);}},
pics/bar/.default=0.5}

\begin{document}
\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size
		damper/.style={thick,
				decorate,
				decoration={markings,
						mark connection node=dmp,
						mark=at position 0.5 with
							{
								\node (dmp) [thick, inner sep=0pt,
									transform shape,
									minimum width=2em,
									minimum height=1.5em, draw=none,
									#1] {};
								\draw [thick] ([xshift=0.25em]dmp.north east) --
								(dmp.north west) -- (dmp.south west) --
								([xshift=0.25em]dmp.south east)
 								([yshift=-0.25em]dmp.north east) --
								([yshift=0.25em]dmp.south east);
							}}},]

	\draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0) 
		to[short,f=$i_a$] ++(0.1,0) 
		to[L,cute inductor, l=$L_a$,-.]  ++(2,0)  
		to[Telmech=M, name=M1] ++(0,-2) 
		to[short,-o] (0,0)	coordinate[label=above:{$+$}] (ML);
	\path (TL) -- node[midway]{$E_a$} (ML);
	%
	\path (M1) ++ (2,0) coordinate (N1);
	\draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};
	%
	\draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}
		-- ++ (-1,0) coordinate (N3) pic[thick]{bar};
	%	
	\draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75} 
	 -- pic[xscale=-1, pic text={$\theta_L$}, pos=0.5 ]{rotarrow} 
	 	++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw, 
			minimum height=2, minimum width=1, aspect=0.4,
			cylinder uses custom fill, cylinder end fill = gray!20, 
			path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}] 
			(c) {$J_L$};
    %			
	\path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em, 
		anchor=west,preaction = {fill=gray!10},pattern=bricks](bricks) {};
	%
	\draw [damper={label=below:{$D_L$}}] (c.west) -- (bricks);
	%
\end{tikzpicture}

\Large
\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size
		damper/.style={thick,
				decorate,
				decoration={markings,
						mark connection node=dmp,
						mark=at position 0.5 with
							{
								\node (dmp) [thick, inner sep=0pt,
									transform shape,
									minimum width=2em,
									minimum height=1.5em, draw=none,
									#1] {};
								\draw [thick] ([xshift=0.25em]dmp.north east) --
								(dmp.north west) -- (dmp.south west) --
								([xshift=0.25em]dmp.south east)
 								([yshift=-0.25em]dmp.north east) --
								([yshift=0.25em]dmp.south east);
							}}},]

	\draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0) 
		to[short,f=$i_a$] ++(0.1,0) 
		to[L,cute inductor, l=$L_a$,-.]  ++(2,0)  
		to[Telmech=M, name=M1] ++(0,-2) 
		to[short,-o] (0,0)	coordinate[label=above:{$+$}] (ML);
	\path (TL) -- node[midway]{$E_a$} (ML);
	%
	\path (M1) ++ (2,0) coordinate (N1);
	\draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};
	%
	\draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}
		-- ++ (-1,0) coordinate (N3) pic[thick]{bar};
	%	
	\draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75} 
	 -- pic[xscale=-1, pic text={$\theta_L$}, pos=0.5 ]{rotarrow} 
	 	++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw, 
			minimum height=2, minimum width=1, aspect=0.4,
			cylinder uses custom fill, cylinder end fill = gray!20, 
			path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}] 
			(c) {$J_L$};
    %			
	\path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em, 
		anchor=west,preaction = {fill=gray!10},pattern=bricks](bricks) {};
	%
	\draw [damper={label=below:{$D_L$}}] (c.west) -- (bricks);
	%
\end{tikzpicture}

\end{document}

xxxxxxxxxx
 
\documentclass[tikz,border=3mm]{standalone}\usepackage[american, siunitx , RPvoltages]{circuitikz}\usetikzlibrary{3d,arrows.meta,bending,calc,decorations.markings,patterns,positioning,shapes.geometric}​\tikzset{pics/rotarrow/.style={code={\path (160:0.4) coordinate (tmpex); \begin{scope}[local bounding box=tmp,x={(tmpex)},    canvas is xy plane at z=0]  \clip (-0.41,-0.41) rectangle (0.41,0.41);  \pgflowlevelsynccm  \draw[thin,-{Stealth[bend]}] (-150:0.4) arc[start angle=-150,end  angle=150,radius=0.4];\end{scope}\path (tmp.north) node [above] {\tikzpictext};}},pics/bar/.style={code={\draw[pic actions] (0,-#1) -- (0,#1);}},pics/bar/.default=0.5}​\begin{document}\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size        damper/.style={thick,                decorate,                decoration={markings,                        mark connection node=dmp,                        mark=at position 0.5 with                            {                                \node (dmp) [thick, inner sep=0pt,                                    transform shape,                                    minimum width=2em,                                    minimum height=1.5em, draw=none,                                    #1] {};                                \draw [thick] ([xshift=0.25em]dmp.north east) --                                (dmp.north west) -- (dmp.south west) --                                ([xshift=0.25em]dmp.south east)                                ([yshift=-0.25em]dmp.north east) --                                ([yshift=0.25em]dmp.south east);                            }}},]​    \draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0)         to[short,f=$i_a$] ++(0.1,0)         to[L,cute inductor, l=$L_a$,-.]  ++(2,0)          to[Telmech=M, name=M1] ++(0,-2)         to[short,-o] (0,0)  coordinate[label=above:{$+$}] (ML);    \path (TL) -- node[midway]{$E_a$} (ML);    %    \path (M1) ++ (2,0) coordinate (N1);    \draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};    %    \draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}        -- ++ (-1,0) coordinate (N3) pic[thick]{bar};    %       \draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75}      -- pic[xscale=-1, pic text={$\theta_L$}, pos=0.5 ]{rotarrow}         ++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw,             minimum height=2, minimum width=1, aspect=0.4,            cylinder uses custom fill, cylinder end fill = gray!20,             path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}]             (c) {$J_L$};    %               \path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em,         anchor=west,preaction = {fill=gray!10},pattern=bricks](bricks) {};    %    \draw [damper={label=below:{$D_L$}}] (c.west) -- (bricks);    %\end{tikzpicture}​\Large\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size        damper/.style={thick,                decorate,                decoration={markings,                        mark connection node=dmp,                        mark=at position 0.5 with                            {                                \node (dmp) [thick, inner sep=0pt,                                    transform shape,                                    minimum width=2em,                                    minimum height=1.5em, draw=none,                                    #1] {};                                \draw [thick] ([xshift=0.25em]dmp.north east) --                                (dmp.north west) -- (dmp.south west) --                                ([xshift=0.25em]dmp.south east)                                ([yshift=-0.25em]dmp.north east) --                                ([yshift=0.25em]dmp.south east);                            }}},]​    \draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0)         to[short,f=$i_a$] ++(0.1,0)         to[L,cute inductor, l=$L_a$,-.]  ++(2,0)          to[Telmech=M, name=M1] ++(0,-2)         to[short,-o] (0,0)  coordinate[label=above:{$+$}] (ML);    \path (TL) -- node[midway]{$E_a$} (ML);    %    \path (M1) ++ (2,0) coordinate (N1);    \draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};    %    \draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}        -- ++ (-1,0) coordinate (N3) pic[thick]{bar};    %       \draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75}      -- pic[xscale=-1, pic text={$\theta_L$}, pos=0.5 ]{rotarrow}         ++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw,             minimum height=2, minimum width=1, aspect=0.4,            cylinder uses custom fill, cylinder end fill = gray!20,             path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}]             (c) {$J_L$};    %               \path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em,         anchor=west,preaction = {fill=gray!10},pattern=bricks](bricks) {};    %    \draw [damper={label=below:{$D_L$}}] (c.west) -- (bricks);    %\end{tikzpicture}​\end{document}
show all 113 lines

Here is an addendum on patterns. This one scales, but only after using {Bricks[brick width=1.01em,brick height=1.01em]} in one code and {Bricks[brick width=1em,brick height=1em]} in the other because otherwise TikZ wants so be efficient and thinks: I already did the one with 1em so I can just recycle that one. The pattern offset is not fixed here (but in principle it could with more efforts, see here).

\documentclass[tikz,border=3mm]{standalone}
\usepackage[american, siunitx , RPvoltages]{circuitikz}
\usetikzlibrary{3d,arrows.meta,bending,calc,decorations.markings,patterns.meta,positioning,shapes.geometric}

\pgfdeclarepattern{name=Bricks,
  parameters={\brickwidth,\brickheight,\brickangle,\bricklinewidth},
  bottom left={\pgfpoint{-.1pt}{-.1pt}},
  top right={\pgfpoint{\brickwidth+.1pt}{\brickheight+.1pt}},
  tile size={\pgfpoint{\brickwidth}{\brickheight}},
  tile transformation={\pgftransformrotate{\brickangle}},
  code={
    \pgfsetlinewidth{\bricklinewidth}
    \pgfpathmoveto{\pgfpoint{-.1pt}{0pt}}
    \pgfpathlineto{\pgfpoint{\brickwidth+.1pt}{0pt}}
    \pgfpathmoveto{\pgfpoint{-.1pt}{0.5*\brickheight}}
    \pgfpathlineto{\pgfpoint{\brickwidth+.1pt}{0.5*\brickheight}}
	\pgfpathmoveto{\pgfpoint{0.25*\brickwidth}{0pt}}
    \pgfpathlineto{\pgfpoint{0.27*\brickwidth}{0.5*\brickheight}}
	\pgfpathmoveto{\pgfpoint{0.75*\brickwidth}{0.5*\brickheight}}
    \pgfpathlineto{\pgfpoint{0.75*\brickwidth}{\brickheight}}
    \pgfusepath{stroke}
} }
\tikzset{/pgf/pattern keys/.cd,
brick width/.store in=\brickwidth,
brick height/.store in=\brickheight,
brick angle/.store in=\brickangle,
brick line width/.store in=\bricklinewidth, 
brick width=1em,
brick height=1em,
brick angle=0pt,
brick line width=.5pt,
}


\tikzset{pics/rotarrow/.style={code={\path (160:0.4) coordinate (tmpex);
 \begin{scope}[local bounding box=tmp,x={(tmpex)},
	canvas is xy plane at z=0]
  \clip (-0.41,-0.41) rectangle (0.41,0.41);
  \pgflowlevelsynccm
  \draw[thin,-{Stealth[bend]}] (-150:0.4) arc[start angle=-150,end
  angle=150,radius=0.4];
\end{scope}
\path (tmp.north) node [above,style/.expanded=\tikzpictextoptions] {\tikzpictext};
}},pics/bar/.style={code={\draw[pic actions] (0,-#1) -- (0,#1);}},
pics/bar/.default=0.5}

\begin{document}
\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size
		damper/.style={thick,
				decorate,
				decoration={markings,
						mark connection node=dmp,
						mark=at position 0.5 with
							{
								\node (dmp) [thick, inner sep=0pt,
									transform shape,
									minimum width=2em,
									minimum height=1.5em, draw=none,
									#1] {};
								\draw [thick] ([xshift=0.25em]dmp.north east) --
								(dmp.north west) -- (dmp.south west) --
								([xshift=0.25em]dmp.south east)
 								([yshift=-0.25em]dmp.north east) --
								([yshift=0.25em]dmp.south east);
							}}},]

	\draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0) 
		to[short,f=$i_a$] ++(0.1,0) 
		to[L,cute inductor, l=$L_a$,-.]  ++(2,0)  
		to[Telmech=M, name=M1] ++(0,-2) 
		to[short,-o] (0,0)	coordinate[label=above:{$+$}] (ML);
	\path (TL) -- node[midway]{$E_a$} (ML);
	%
	\path (M1) ++ (2,0) coordinate (N1);
	\draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};
	%
	\draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}
		-- ++ (-1,0) coordinate (N3) pic[thick]{bar};
	%	
	\draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75} 
	 -- pic[xscale=-1,pic text={$\theta_L$}, pos=0.5 ]{rotarrow} 
	 	++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw, 
			minimum height=2, minimum width=1, aspect=0.4,
			cylinder uses custom fill, cylinder end fill = gray!20, 
			path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}] 
			(c) {$J_L$};
    %			
	\path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em, 
		anchor=west,preaction = {fill=gray!10},
		pattern={Bricks[brick width=1.01em,brick height=1.01em]}](bricks) {};
	%
	\draw [damper={label={below:{$D_L$}}}] (c.west) -- (bricks);
	%
\end{tikzpicture}

\Large
\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size
		damper/.style={thick,
				decorate,
				decoration={markings,
						mark connection node=dmp,
						mark=at position 0.5 with
							{
								\node (dmp) [thick, inner sep=0pt,
									transform shape,
									minimum width=2em,
									minimum height=1.5em, draw=none,
									#1] {};
								\draw [thick] ([xshift=0.25em]dmp.north east) --
								(dmp.north west) -- (dmp.south west) --
								([xshift=0.25em]dmp.south east)
 								([yshift=-0.25em]dmp.north east) --
								([yshift=0.25em]dmp.south east);
							}}},]

	\draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0) 
		to[short,f=$i_a$] ++(0.1,0) 
		to[L,cute inductor, l=$L_a$,-.]  ++(2,0)  
		to[Telmech=M, name=M1] ++(0,-2) 
		to[short,-o] (0,0)	coordinate[label=above:{$+$}] (ML);
	\path (TL) -- node[midway]{$E_a$} (ML);
	%
	\path (M1) ++ (2,0) coordinate (N1);
	\draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};
	%
	\draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}
		-- ++ (-1,0) coordinate (N3) pic[thick]{bar};
	%	
	\draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75} 
	 -- pic[xscale=-1, pic text={$\theta_L$}, pos=0.5 ]{rotarrow} 
	 	++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw, 
			minimum height=2, minimum width=1, aspect=0.4,
			cylinder uses custom fill, cylinder end fill = gray!20, 
			path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}] 
			(c) {$J_L$};
    %			
	\path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em, 
		anchor=west,preaction = {fill=gray!10},
		pattern={Bricks[brick width=1em,brick height=1em]}](bricks) {};
	%
	\draw [damper={label={below:{$D_L$}}}] (c.west) -- (bricks);
	%
\end{tikzpicture}

\end{document}

xxxxxxxxxx
 
\documentclass[tikz,border=3mm]{standalone}\usepackage[american, siunitx , RPvoltages]{circuitikz}\usetikzlibrary{3d,arrows.meta,bending,calc,decorations.markings,patterns.meta,positioning,shapes.geometric}​\pgfdeclarepattern{name=Bricks,  parameters={\brickwidth,\brickheight,\brickangle,\bricklinewidth},  bottom left={\pgfpoint{-.1pt}{-.1pt}},  top right={\pgfpoint{\brickwidth+.1pt}{\brickheight+.1pt}},  tile size={\pgfpoint{\brickwidth}{\brickheight}},  tile transformation={\pgftransformrotate{\brickangle}},  code={    \pgfsetlinewidth{\bricklinewidth}    \pgfpathmoveto{\pgfpoint{-.1pt}{0pt}}    \pgfpathlineto{\pgfpoint{\brickwidth+.1pt}{0pt}}    \pgfpathmoveto{\pgfpoint{-.1pt}{0.5*\brickheight}}    \pgfpathlineto{\pgfpoint{\brickwidth+.1pt}{0.5*\brickheight}}    \pgfpathmoveto{\pgfpoint{0.25*\brickwidth}{0pt}}    \pgfpathlineto{\pgfpoint{0.27*\brickwidth}{0.5*\brickheight}}    \pgfpathmoveto{\pgfpoint{0.75*\brickwidth}{0.5*\brickheight}}    \pgfpathlineto{\pgfpoint{0.75*\brickwidth}{\brickheight}}    \pgfusepath{stroke}} }\tikzset{/pgf/pattern keys/.cd,brick width/.store in=\brickwidth,brick height/.store in=\brickheight,brick angle/.store in=\brickangle,brick line width/.store in=\bricklinewidth, brick width=1em,brick height=1em,brick angle=0pt,brick line width=.5pt,}​​\tikzset{pics/rotarrow/.style={code={\path (160:0.4) coordinate (tmpex); \begin{scope}[local bounding box=tmp,x={(tmpex)},    canvas is xy plane at z=0]  \clip (-0.41,-0.41) rectangle (0.41,0.41);  \pgflowlevelsynccm  \draw[thin,-{Stealth[bend]}] (-150:0.4) arc[start angle=-150,end  angle=150,radius=0.4];\end{scope}\path (tmp.north) node [above,style/.expanded=\tikzpictextoptions] {\tikzpictext};}},pics/bar/.style={code={\draw[pic actions] (0,-#1) -- (0,#1);}},pics/bar/.default=0.5}​\begin{document}\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size        damper/.style={thick,                decorate,                decoration={markings,                        mark connection node=dmp,                        mark=at position 0.5 with                            {                                \node (dmp) [thick, inner sep=0pt,                                    transform shape,                                    minimum width=2em,                                    minimum height=1.5em, draw=none,                                    #1] {};                                \draw [thick] ([xshift=0.25em]dmp.north east) --                                (dmp.north west) -- (dmp.south west) --                                ([xshift=0.25em]dmp.south east)                                ([yshift=-0.25em]dmp.north east) --                                ([yshift=0.25em]dmp.south east);                            }}},]​    \draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0)         to[short,f=$i_a$] ++(0.1,0)         to[L,cute inductor, l=$L_a$,-.]  ++(2,0)          to[Telmech=M, name=M1] ++(0,-2)         to[short,-o] (0,0)  coordinate[label=above:{$+$}] (ML);    \path (TL) -- node[midway]{$E_a$} (ML);    %    \path (M1) ++ (2,0) coordinate (N1);    \draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};    %    \draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}        -- ++ (-1,0) coordinate (N3) pic[thick]{bar};    %       \draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75}      -- pic[xscale=-1,pic text={$\theta_L$}, pos=0.5 ]{rotarrow}         ++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw,             minimum height=2, minimum width=1, aspect=0.4,            cylinder uses custom fill, cylinder end fill = gray!20,             path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}]             (c) {$J_L$};    %               \path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em,         anchor=west,preaction = {fill=gray!10},        pattern={Bricks[brick width=1.01em,brick height=1.01em]}](bricks) {};    %    \draw [damper={label={below:{$D_L$}}}] (c.west) -- (bricks);    %\end{tikzpicture}​\Large\begin{tikzpicture}[x=3em,y=3em, %<- this scales with the font size        damper/.style={thick,                decorate,                decoration={markings,                        mark connection node=dmp,                        mark=at position 0.5 with                            {                                \node (dmp) [thick, inner sep=0pt,                                    transform shape,                                    minimum width=2em,                                    minimum height=1.5em, draw=none,                                    #1] {};                                \draw [thick] ([xshift=0.25em]dmp.north east) --                                (dmp.north west) -- (dmp.south west) --                                ([xshift=0.25em]dmp.south east)                                ([yshift=-0.25em]dmp.north east) --                                ([yshift=0.25em]dmp.south east);                            }}},]​    \draw (0,2) coordinate[label=below:{$+$}] (TL)to[R=$R_a$,o-] ++(2,0)         to[short,f=$i_a$] ++(0.1,0)         to[L,cute inductor, l=$L_a$,-.]  ++(2,0)          to[Telmech=M, name=M1] ++(0,-2)         to[short,-o] (0,0)  coordinate[label=above:{$+$}] (ML);    \path (TL) -- node[midway]{$E_a$} (ML);    %    \path (M1) ++ (2,0) coordinate (N1);    \draw[thick] (M1) -- pic[pic text={$T_m,\theta_m$}]{rotarrow} (N1) pic[thick]{bar};    %    \draw[thick] ([yshift=-4.5em]N1) coordinate (N2) pic[thick]{bar=0.75}        -- ++ (-1,0) coordinate (N3) pic[thick]{bar};    %       \draw[thick] ([yshift=-3.5em]N3) pic[thick]{bar=0.75}      -- pic[xscale=-1, pic text={$\theta_L$}, pos=0.5 ]{rotarrow}         ++ (-1,0) node[anchor=top,cylinder, black, shape border rotate=0, draw,             minimum height=2, minimum width=1, aspect=0.4,            cylinder uses custom fill, cylinder end fill = gray!20,             path picture={\draw($(c.before top)!0.5!(c.after top)$) -- (c.top);}]             (c) {$J_L$};    %               \path (TL|-c) node[draw, rectangle, minimum height=5em, minimum width = 1.5em,         anchor=west,preaction = {fill=gray!10},        pattern={Bricks[brick width=1em,brick height=1em]}](bricks) {};    %    \draw [damper={label={below:{$D_L$}}}] (c.west) -- (bricks);    %\end{tikzpicture}​\end{document}
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