METHOD FOR ESTIMATING THE VALUE OF A BRAKING RESISTOR USED IN A POWER CONVERTER

摘要

The invention relates to a method for estimating the value of a braking resistor (Rf) used in a power converter connected to an electric motor (M). The power converter comprises a braking cell (CelF) connected to the first power supply line (L1) and to the second power supply line (L2) of the bus of the converter, and comprises a switching member (Sw), a diode (D) connected in series to the switching member, and the braking resistor (Rf) connected in parallel to said diode. Said method is implemented during the braking of the electric motor (M), and involves: determining the capacity value (C) of the bus capacitor when the switching member is in an open state; and determining the value (R) of the braking resistor (Rf) from the capacity value (C) of the bus capacitor, the voltage (Vbus) of the continuous power supply bus, and the current (Im) generated by the electric motor during braking when the switching member is in a closed state.