Abstract: A work machine, such as a vibration tamper or a vibratory plate machine, includes a work device such as a ground contact plate, and a drive for driving the work device. The drive has an electric drive motor, an electric power accumulator for supplying the drive motor with an electric current, and an inverter installation for inverting the current from the power accumulator and for supplying the current to the drive motor. A cooling device is provided for cooling the power accumulator and the inverter installation. The cooling device has at least one fan installation for generating a cooling airflow which is able to be guided by way of the power accumulator and the inverter installation. The fan installation has a fan and a fan motor that drives the fan. The fan motor is provided separately from the drive motor of the drive.

Abstract: An unbalance exciter for a vibratory plate includes a rotatably mounted unbalance shaft, on which an unbalance mass is provided. The exciter includes an exciter housing for the unbalance shaft, at least two bearing devices for the rotatable mounting of the unbalance shaft, and two bearing seats for the bearing devices. The exciter housing has a central part and two end parts arranged at the ends of the central part. The central part has a hollow-cylindrical recess in which a bearing point is provided for each of the bearing devices. The the central part is designed to optionally accommodate an unbalance shaft for either a first drive type in which the unbalance exciter can be driven by a drive device provided outside the exciter housing, or a second drive type in which the unbalance exciter can be driven by a drive device provided inside the exciter housing.