Magnetically coupled contactless damper

A power filtering circuit of a multi-phase electrical machine, the power filtering circuit comprising:

• a plurality of power phases, each of the power phases comprising a damper filter coupled to a power input and a power output, wherein the damper filter comprises an inductor damper circuit coupled to a capacitor, the inductor damper circuit comprising:
• a shared magnetic core;
• a primary winding comprising an inductor winding of a first wire gauge wound about the shared magnetic core;
• and
• a secondary winding comprising a resistive damper winding of a second wire gauge that is less than the first wire gauge and wound about the shared magnetic core in contactless magnetic coupling with the primary winding, and the resistive damper winding comprises a resistive alloy that has a higher resistance characteristic per unit distance than the primary winding.

A method comprising:

• coupling an input lead of a primary winding of a damper filter to a power input;
• coupling an output lead of the primary winding of the damper filter to a power output;
• and
• establishing a contactless magnetic coupling between the primary winding and a secondary winding wound about a shared magnetic core of an inductor in the damper filter, wherein the primary winding comprises an inductor winding of a first wire gauge and the secondary winding comprises a resistive damper winding of a second wire gauge that is less than the first wire gauge and operable to provide electrical damping between the power input and the power output, and the resistive damper winding comprises a resistive alloy that has a higher resistance characteristic per unit distance than the primary winding.