The main reason for the limited range of applications of piezoelectric linear motors is their small force and power range. This thesis presents an approach to achieve drives with higher power by bundling multiple motors. But in this case many other questions arise: The electromechanical behaviour of the individual motors differs slightly due to manufacturing and assembly tolerances. The individual motor characteristics are strongly dependent on the driving parameters (frequency, voltage, temperature, pre-stress, etc.). In the most simple case, the thrust of single motors should simply add up to the total thrust of the drive and the no-load velocity should be the same for single motors and for the total drive. But due to the variations of motor parameters, mentioned above, the composition of the overall characteristics is difficult and needs a proper modelling.In the first part basic principles of linear piezoelectric ultrasonic motors will be given. This part ends with the description of a novel miniaturized ultrasonic linear motor with a very simple mechanical structure, which can be produced at low cost. The characteristics and performance limits of this motor will be illustrated.An overview of the fundamentals of contact processes follows, and a simplified contact model for the complex ultrasonic micro-impact process is derived. This contact model was succesfully implemented in a motor model to predict the driving behaviour of single motors and a set of coupled motors.Finally driving strategies for a single motor as well as for a bundle of motors will be presented. The investigated strategies have been analyzed theoretically and were tested experimentally on a test rig. The thesis closes with an evaluation of the results and an outlook on further developments.