Patent ID: 8823297

Claim:
Method of control implemented in a variable speed drive for controlling deceleration of an electric motor in the case of electrical power outage, the variable speed drive comprising a DC power supply bus to which is applied a voltage, the said DC power supply bus being connected to an inverter module, the said inverter module being connected to the electric motor and controlled according to a control law in which a control voltage to be applied to the electric motor is determined on the basis of a flux reference and of a speed reference, characterized in that the method of control comprises: a step of determining Joule-effect losses to be applied to the electric motor and to the variable speed drive according to a deceleration ramp to be applied to the electric motor during an electrical power outage, a step of determining the flux reference as a function of the Joule-effect losses to be applied to the electric motor and to the variable speed drive.