ELECTROMOTOR UNIT FOR A REVERSIBLE SEAT BELT RETRACTOR AND METHOD FOR OPERATING A SEAT BELT RETRACTOR

The present invention relates to an electric motor unit, in particular for a reversible belt tensioner, with an electric motor (1) having a rotor, wherein the rotor is coupled with a shaft (2) and the shaft (2) can be driven by the electric motor to perform a rotational movement, which is characterized in that the electric motor unit has at least one acceleration device (3) for accelerating the shaft (2), wherein the acceleration device (3) has at least one pyrotechnic drive.