a = 0.04; b = 0.003; c = 0.0015; i0 = 0;
bild1 = Plot3D[(b v - c w)/(v (a - v) (v - 1) - w + i0), {
    v, -0.4, 1.1}, {w, 0, 0.2},
      ImageSize -> {400, 300}, PlotPoints -> 50, AxesLabel -> {"u", "
      v", "u'/v'"}];