Mrthfx

I'm using circuitikz to create an electric circuit diagram. I'd like to draw a DC motor like this:

_{(source: expertsmind.com)}

or this one:

It looks like there's no symbol for motors in circuitikz. I'm using begin{circuitikz}[american]. How I draw those symbols?

The hard part was getting the M right side up.

documentclass{article}

usepackage[screen,nopanel]{pdfscreen}

usepackage{circuitikz}



margins{0.2cm}{0.2cm}{0.2cm}{0.2cm}

screensize{3cm}{5cm}

backgroundcolor{white}



% prepare to create bipoles



makeatletter

defTikzBipolePath#1#2{pgf@circ@bipole@path{#1}{#2}}

defCircDirection{pgf@circ@direction}



pgf@circ@Rlen = pgfkeysvalueof{/tikz/circuitikz/bipoles/length}



makeatother 



newlength{ResUp} newlength{ResDown}

newlength{ResLeft} newlength{ResRight}



% set default motor size



ctikzset{bipoles/motor/height/.initial=.8}

ctikzset{bipoles/motor/width/.initial=.8}



% create motor shape



pgfcircdeclarebipole{}

 {ctikzvalof{bipoles/motor/height}}

 {motor}

 {ctikzvalof{bipoles/motor/height}}

 {ctikzvalof{bipoles/motor/width}}

 {

    pgfsetlinewidth{ctikzvalof{bipoles/thickness}pgfstartlinewidth}

    pgfextractx{ResRight}{northeast}

    pgfextracty{ResUp}{northeast}

    pgfextractx{ResLeft}{southwest}

    pgfextracty{ResDown}{southwest}



  pgfpathmoveto{pgfpoint{0.775ResLeft}{0.2ResDown}}

pgfpathlineto{pgfpoint{ResLeft}{0.2ResDown}}

  pgfpathlineto{pgfpoint{ResLeft}{0.2ResUp}}

  pgfpathlineto{pgfpoint{0.775ResLeft}{0.2ResUp}}

pgfpathellipse{pgfpointorigin}{pgfpoint{0.8ResRight}{0cm}}

    {pgfpoint{0cm}{0.8ResUp}}

  pgfpathmoveto{pgfpoint{0.775ResRight}{0.2ResDown}}

    pgfpathlineto{pgfpoint{ResRight}{0.2ResDown}}

  pgfpathlineto{pgfpoint{ResRight}{0.2ResUp}}

  pgfpathlineto{pgfpoint{0.775ResRight}{0.2ResUp}}

  pgfusepath{draw} %draw motor

    pgftext[rotate=-CircDirection]{textsf{M}}

 }



% create motorto-path style



defmotorpath#1{TikzBipolePath{motor}{#1}}

tikzset{motor/.style = {circuitikzbasekey, /tikz/to path=motorpath, l=#1}}



% end of setup



begin{document}



begin{center}

begin{circuitikz}

 draw (0,0) to[motor, l=motor, o-*] (0,2);

end{circuitikz}

end{center}



newpage

begin{center}

begin{circuitikz}

 draw (0,0) to[motor, l=motor, o-*] (2,0);

end{circuitikz}

end{center}



end{document}

Another alternative is to modify an existing two-terminal element in the circuitikz such as sV and redefine a new command called mymotor that draws the desired shape and form. Here two shapes (mymotor, mymotorB) are defined as asked by the OP.

newcommand{mymotor}[2] % #1 = name , #2 = rotation angle

{draw[thick,rotate=#2] (#1) circle (10pt)

 node[]{$mathsf M$} 

++(-12pt,3pt)--++(0,-6pt) --++(2.5pt,0) ++(-2.8pt,6pt)-- ++(2.5pt,0pt);

draw[thick,rotate=#2] (#1) ++(12pt,3pt)--++(0,-6pt) --++(-2.5pt,0) 

++(2.8pt,6pt)-- ++(-2.5pt,0pt);

}

Code:

documentclass[border=20pt]{standalone}  

usepackage[american,siunitx]{circuitikz}

usetikzlibrary{arrows,shapes,calc,positioning}



newcommand{mymotor}[2] % #1 = name , #2 = rotation angle

{draw[thick,rotate=#2] (#1) circle (10pt)

 node[]{$mathsf M$} 

++(-12pt,3pt)--++(0,-6pt) --++(2.5pt,0) ++(-2.8pt,6pt)-- ++(2.5pt,0pt);

draw[thick,rotate=#2] (#1) ++(12pt,3pt)--++(0,-6pt) --++(-2.5pt,0) ++(2.8pt,6pt)-- ++(-2.5pt,0pt);

}



newcommand{mymotorB}[2] % #1 = name 

{draw[thick] (#1) circle (12pt)

node[above=-3pt]{$mathsf M$} ++(-8pt,-3pt)--++(15pt,0);

draw[thick,dashed] (#1) ++(-8pt,-5pt)--++(15pt,0);

}



begin{document}



begin{circuitikz}

draw (0,2) to[L, l_=$L$, o-*] (2,2) to[sV, color=white, name=M1] (3.5,2) to[short,*-] (5,2);

mymotor{M1}{0}

draw (0,0) to[short, o-*] (2,0) to[short, -*] (3.5,0) to[short] (5,0);

draw (2,2) to[C=$C$] (2,0);

draw (3.5,2) to[R=$R$] (3.5,0);

draw (5,2) to[sV, color=white, name=M2] (5,0);

mymotor{M2}{90}

%

draw (2,3) to[sV, color=white, name=M3] (3.5,3);

mymotorB{M3}



draw (6,2) to[sV, color=white, name=M4] (6,0);

mymotorB{M4}



end{circuitikz}



end{document}