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'"}];