// shaft
solidpen 192 192 192 5
moveto 80 40
lineto 100 40
solidpen 0 0 0 0
moveto 70 40
lineto 60 20
lineto 50 20
moveto 70 40
lineto 50 40
moveto 70 40
lineto 60 60
lineto 50 60
ellipse 55 25 85 55
textcenter 70 40 M/G
// dc ac
rectangle -10 0 50 100
moveto 50 0 
lineto -10 100
label 15 20 DC
label 35 80 AC
//pi controller
//rectangle -10 70 50 90
//textcenter 20 80 PI
// uP
roundrect 52 70 80 90 3 3
label 66 80 PI
//solidpen 255 0 0 0
//moveto 100 80
//lineto 80 80
//lineto 90 83
//moveto 80 80
//lineto 90 77
label 90 92 ω