Controller for an electrical power supply circuit of a superconducting motor, superconducting electrical power supply system for a motor, and aircraft comprising such a system

A controller for a power supply circuit of an electric motor, said power supply circuit comprising a power converter, referred to as an inverter, configured to supply at least one AC voltage from a DC voltage source and a superconducting power supply link configured to supply said electric motor with power, the superconducting power supply link being connected between an output of the inverter and the electric motor, said controller device for a power supply circuit comprising a control output configured to control said inverter, at least one first input configured to receive at least one first signal representative of a voltage measured across terminals of said superconducting power supply link, and a second input, referred to as a synchronization input, configured to receive at least one second signal representative of a position of a rotor of said electric motor, said controller device for a power supply circuit comprising electronic circuitry configured to:

• i) multiply said first signal and a sinusoidal signal synchronized with said second signal to obtain a third signal representative of a resistive component of said voltage measured across terminals of said superconducting power supply link, and then,
• ii) when said third signal exceeds a threshold value, inhibit said control output, and when not, repeat steps i) and ii).