Method of control implemented in a variable speed drive for controlling the deceleration of an electric motor in the case of power outage

摘要

The method involves determining Joule-effect losses to be applied to an electric motor (M) and to a variable speed drive according to a deceleration ramp to be applied to the electric motor during an electrical power outage. A flux reference (phief) is determined depending on the Joule-effect losses. The Joule-effect losses are determined by a comparison of voltage (Vbus) measured on a direct-current (DC) power supply bus (15) of the variable speed drive with a reference value (Vbus-ref), which corresponds to available energy required to follow a deceleration ramp for the electric motor. An independent claim is also included for a variable speed drive.