Autonomous vehicle for use in feeding animals, in particular cows, such as dairy cows or beef cows, wherein the vehicle comprises: - a frame, in particular an undercarriage, - displacement means for moving the frame, - a container arranged on the frame for holding animal feed, and with a dispensing opening for dispensing the held animal feed from the container, - a rotatable auger arranged in the container for mixing and/or chopping the held animal feed, - an auger drive for rotating the auger, with a three-phase motor, and with a frequency controller for controlling the three-phase motor, in particular for setting a motor speed of the three-phase motor, wherein the three-phase motor is connectable, in particular via the frequency controller, to a three-phase power supply network (400 V), - a battery power supply for the three-phase motor, which is configured to be charged by means of the three-phase power supply network, - a sensor, which is configured to determine a signal that is related to the amount of animal feed in the container, and - a control system for controlling the frequency controller, wherein the control system is connected to the sensor in order to receive the signal from the sensor, characterized in that the three-phase motor is connected to the frequency controller via a first relay group so as to be connectable in star configuration, and is connected to the frequency controller via a second relay group so as to be connectable in delta configuration, and the control system is configured to switch the first and second relay group (15, 16) so that the three-phase motor is connected to the frequency controller in star configuration when the three-phase motor is connected, in particular via the frequency controller, to the three-phase power supply network in order to mix and/or chop held animal feed, and is further configured, in the case when the three-phase motor is supplied with power by the battery power supply without being connected to the three-phase power supply network and the control system gives an "empty" indicator on the basis of the signal received from the sensor, to switch the first and second relay group (15, 16) so that the three-phase motor is connected to the frequency controller in delta configuration, in particular in order to increase the maximum motor speed with which the torque for rotating the auger can be delivered. - a frame, in particular an undercarriage, - displacement means for moving the frame, - a container arranged on the frame for holding animal feed, and with a dispensing opening for dispensing the held animal feed from the container, - a rotatable auger arranged in the container for mixing and/or chopping the held animal feed, - an auger drive for rotating the auger, with a three-phase motor, and with a frequency controller for controlling the three-phase motor, in particular for setting a motor speed of the three-phase motor, wherein the three-phase motor is connectable, in particular via the frequency controller, to a three-phase power supply network (400 V), - a battery power supply for the three-phase motor, which is configured to be charged by means of the three-phase power supply network, - a sensor, which is configured to determine a signal that is related to the amount of animal feed in the container, and - a control system for controlling the frequency controller, wherein the control system is connected to the sensor in order to receive the signal from the sensor,