  We study the relation between quantum pumping of charge and the work
exchanged with the driving potentials in a strongly interacting ac-driven
quantum dot. We work in the large-interaction limit and in the adiabatic
pumping regime, and we develop a treatment that combines the time-dependent
slave-boson approximation with linear response in the rate of change of the
ac-potentials. We find that the time evolution of the system can be described
in terms of equilibrium solutions at every time. We analyze the effect of the
electronic interactions on the performance of the dot when operating as a
quantum motor.
  The main two effects of the interactions are a shift of the resonance and an
enhancement of the efficiency with respect to a non-interacting dot. This is
due to the appearance of additional ac-parameters accounting for the
interactions that increase the pumping of particles while decreasing the
conductance.
