Three-phase motor drive system having a filter , an AC/AC converter , and a motor, the filter comprising for each phase a supply side input, a motor side input, a conductor between the supply side input and the motor side input for conducting the current of the motor drive between a supply and a motor, and a connection point in the conductor, wherein the filter comprises three capacitors connected in a star point and/or delta connection with the connection points of the conductors of the three phases, wherein the filter comprises at least two of a first three-phase differential mode reactor between the supply side input and the connection point, a second three-phase differential mode reactor between the motor side input and the connection point, and a third three-phase differential mode reactor connected via a star point and/or delta connection with the connection points, characterized in that one of the at least two three-phase differential mode reactors is a common mode compensating three-phase differential mode reactor with the following features: a first core element (2.1); a second core element (2.2); a third core element (2.3); a first coil (1.3) wound around the first core element (2.1) for conducting the current of a first phase and for damping the differential mode noise currents in the first phase; a second coil (1.2) wound around the second core element (2.2) for conducting the current of a second phase and for damping the differential mode noise currents in the second phase; a third coil (1.3) wound around the third core element (2.3) for conducting the current of a third phase and for damping the differential mode noise currents in the third phase; and wherein the common mode compensating three-phase differential mode reactor comprises an auxiliary coil (6; 6.1, 6.2, 6.3) wound such around the first core element (2.1), the second core element (2.2) and the third core element (2.3) that a common mode current in the first phase, the second phase and the third phase is induced in the auxiliary coil (6; 6.1, 6.2, 6.3), wherein a first end of the auxiliary coil (6; 6.1, 6.2, 6.3) is connected via a complex impedance, that comprises a combination of a capacitor and an inductor, with a second end of the auxiliary coil (6; 6.1, 6.2, 6.3). a first core element (2.1); a second core element (2.2); a third core element (2.3); a first coil (1.3) wound around the first core element (2.1) for conducting the current of a first phase and for damping the differential mode noise currents in the first phase; a second coil (1.2) wound around the second core element (2.2) for conducting the current of a second phase and for damping the differential mode noise currents in the second phase; a third coil (1.3) wound around the third core element (2.3) for conducting the current of a third phase and for damping the differential mode noise currents in the third phase; and wherein the common mode compensating three-phase differential mode reactor comprises an auxiliary coil (6; 6.1, 6.2, 6.3) wound such around the first core element (2.1), the second core element (2.2) and the third core element (2.3) that a common mode current in the first phase, the second phase and the third phase is induced in the auxiliary coil (6; 6.1, 6.2, 6.3), wherein a first end of the auxiliary coil (6; 6.1, 6.2, 6.3) is connected via a complex impedance, that comprises a combination of a capacitor and an inductor, with a second end of the auxiliary coil (6; 6.1, 6.2, 6.3). <EOS>