The rotational drive system (100) comprises: - a voltage source (102); - an electric motor (104) comprising a stator with independent phases (a, b, c), and a rotor (106); - an inverter (108) intended to connect each phase (a, b, c) to the voltage source (102) to generate phase currents; and - a control device (112) of the inverter (108). The rotational drive system (100) is characterized in that the control device (112) comprises: - a unit (114) for determining whether the fundamental frequency of the phase currents is lower than a frequency threshold equal to at most 100 Hz; and - a command generation unit (118), configured such that, when the fundamental frequency is determined to be lower than the frequency threshold, the command causes a homopolar component to appear in the phase currents.
