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

A circuit for controlling a power supply circuit of an electric motor, the power supply circuit comprising a power converter, called an inverter and configured for delivering three AC voltages starting from a DC voltage source and a superconducting three-phase power supply link comprising three electrical power supply lines configured for supplying the electric motor, the circuit comprising a power supply circuit controller comprising at least one control output (CTRL) configured for controlling the said inverter, the circuit comprising:

• electronic circuitry configured for:
• i) obtaining a first signal (ΔVa) representative of a potential difference between ends of a first line selected from the three electrical power supply lines of the three-phase power supply link,
• ii) obtaining a second signal (ΔVb) representative of a potential difference between ends of a second line selected from the three electrical power supply lines of the three-phase power supply link,
• iii) obtaining a third signal (ΔVc) representative of a potential difference between ends of a third line selected from the three electrical power supply lines of the three-phase power supply link,
• iv) determining a sum signal (S) representative of a sum of the first signal (ΔVa), the second signal (ΔVb), and the third signal (ΔVc), and,
• v) when the sum signal (S) exceeds a predetermined threshold value, inhibiting the at least one control output (CTRL), otherwise, repeating the steps i) to v).