Method for controlling an electric motor in the event of a speed measurement anomaly

An electrical control system for a synchronous electric motor comprising a mechanical control block configured to receive a mechanical setpoint and deliver a mechanical torque reference, an electrical control block configured to deliver a voltage reference as a function of the torque reference delivered by the mechanical control block, a power block configured to deliver a control voltage to the electric motor as a function of the voltage reference delivered by the electrical control block, a position sensor of the rotor of the electric motor that said electrical control system controls, and means for measuring the current across the electric motor controlled by said electrical control system,

• wherein the electrical control block further comprises:
• a means for detecting an anomaly in the measurement of the position sensor via a control of the consistency of the position or speed information with the current information,
• a module for adapting the electrical control gains configured to adapt the gains as a function of the detection or non-detection of an anomaly in the measurement of the position of the electric motor,
• a control module configured to deliver voltage references from the mechanical torque reference, the current measured across the electric motor, and the electrical control gains delivered by the adaptation module.