As the low-thrust manoeuvres are assuming more importance in the spacecraft propulsion, the analysis of this kind of transfer is essential for understanding and controlling it. In this sense, we want to study simplified steering laws that are easier to perform with the spacecraft and that we can control in each point of the transfer. The analysis starts with the Lagrange planetary equations applied with four steering laws and in case of periapsis or apoapsis centred burns, obtaining the rates of change of the Keplerian orbital parameters in one revolution. One of the most important application of this method concerns the Jupiter moons tour, a tour between the Galilean moons that nowadays is subject of many studies.