Motor control system with electric safety braking

A motorization control system for a mobile electric vehicle comprising an at least three-phase brushless DC motor, an electronic control system for controlling said motor comprising a main electrical supply device supplying power to power half-bridges that supply power to said phases of the motor and that are provided with upper arms fitted with first electronic switches and lower arms fitted with second electronic switches, said electronic control system further comprising a programmable computer having a program for controlling said first and second electronic switches, via control outputs for said electronic switches, to produce at least a first, drive mode of the motor, based on sequential switching control of the switches to create the rotating electric field that turns the motor, and a second, freewheel mode, in which the electronic switches of said power half-bridges are open, characterized in that the motorization control system comprises a safety circuit that is designed to produce an emergency braking mode FS and that is provided with third electronic switches for short-circuiting the lower arms of the half-bridges in parallel with said second electronic switches, said third electronic switches being controlled by an additional switching circuit that is provided with a detection channel for detecting an interruption of the main electrical supply device and/or with a control channel from said programmable computer and that is designed to close said third switches in order to produce said emergency braking, said additional switching circuit being supplied with power by a secondary electrical supply device,

• wherein the programmable computer comprises a configuration programming mode comprising a traction configuration, in which the computer controls the first and second electronic switches based on said sequential control, a freewheel configuration, in which the computer controls the first and second electronic switches to open, and a motor braking configuration, in which the computer controls the second electronic switches to simultaneously close and the first electronic switches to simultaneously open in a short-circuit mode of the phases of the motor, said computer having an operating mode designed to implement said configurations in accordance with control phases of said mobile vehicle.