Motor drive with a filter including a three-phase differential mode reactor with common mode damping
AssigneeSchaffner EMV AG
InventorsAndrew Cecil Tucker, Luca Dalessandro, Jari Tapani Heininen
Life of this patent
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Abstract
Motor drive with a T-type filter with at least two three-phase differential mode reactors and three capacitors, wherein at least one of the three-phase differential mode reactor comprises an auxiliary coil (6) wound around three wound core elements (2.1, 2.2, 2.3) such that the common mode current is induced in the auxiliary coil (6).
Claims15
Three-phase differential mode filter for a motor drive system having a first phase, a second phase, and a third phase, comprising for each one of the three phases a supply side input, a motor side input, a conductor between the supply side input and the motor side input for conducting a current of the motor drive between a supply and a motor, a connection point in the conductor, wherein the three-phase differential mode filter comprises three capacitors connected in a star point and/or delta connection with the connection points of the conductors of the first phase, second phase and third phase, wherein the three-phase differential mode 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, wherein one of the at least two three-phase differential mode reactors is a common mode compensating three-phase differential mode reactor with:
- a first core element;
- a second core element;
- a third core element;
- a first coil wound around the first core element for conducting the current of a first phase and for damping a differential mode noise currents in the first phase;
- a second coil wound around the second core element for conducting the current of a second phase and for damping a differential mode noise currents in the second phase;
- a third coil wound around the third core element for conducting the current of a third phase and for damping a differential mode noise currents in the third phase;
- and
- wherein the common mode compensating three-phase differential mode reactor comprises an auxiliary coil wound such around the first core element, the second core element and the third core element that a common mode current in the first phase, the second phase and the third phase is induced in the auxiliary coil.
Three-phase differential mode reactor with a first phase, a second phase, and a third phase, the reactor comprising:
- a first core element;
- a second core element;
- a third core element;
- a first coil wound around the first core element for conducting a current of the first phase and for damping a differential mode noise currents in the first phase;
- a second coil wound around the second core element for conducting a current of the second phase and for damping a differential mode noise currents in the second phase;
- a third coil wound around the third core element for conducting the current of the third phase and for damping a differential mode noise currents in the third phase;
- an auxiliary coil wound such around the first core element, the second core element and the third core element that a common mode current in the first phase, the second phase and the third phase is induced in the auxiliary coil.
Dependencies are inferred from the claim text.