  We develop a three-dimensional kinematic self-sustaining model of the solar
dynamo in which the poloidal field generation is from tilted bipolar sunspot
pairs placed on the solar surface above regions of strong toroidal field by
using the SpotMaker algorithm, and then the transport of this poloidal field to
the tachocline is primarily caused by turbulent diffusion. We obtain a dipolar
solution within a certain range of parameters. We use this model to study the
build-up of the polar magnetic field and show that some insights obtained from
surface flux transport (SFT) models have to be revised. We present results
obtained by putting a single bipolar sunspot pair in a hemisphere and two
symmetrical sunspot pairs in two hemispheres.We find that the polar fields
produced by them disappear due to the upward advection of poloidal flux at low
latitudes, which emerges as oppositely-signed radial flux and which is then
advected poleward by the meridional flow. We also study the effect that a large
sunspot pair, violating Hale's polarity law would have on the polar field. We
find that there would be some effect---especially if the anti-Hale pair appears
at high latitudes in the mid-phase of the cycle---though the effect is not very
dramatic.
