Positioning Drive and Method for Positioning an Output Element

Positioning drive (15) for positioning of a power take-off element (16), the drive comprising:

• a mechanical coupling unit (18) that has a first coupling input (19), a second coupling input (20), and a coupling output (17), wherein the coupling output (17) is connected with the power take-off element (16),
• a first stepper drive unit (21), which has a first stepper drive (23) connected with the first coupling input (19), and a first stepper drive controller (22) that is set up to control the first stepper motor (23),
• a second stepper drive unit (24), which has a second stepper drive (26) connected with the second coupling input (20), and a second stepper drive controller (25), which is set up to control the second stepper motor (26),
• a central unit (31), to which a kinematic reference value (PS) and a tensioning reference value (VS) can be provided, or in which a kinematic reference value (PS) and/or a tensioning reference value (VS) can be determined,
• wherein the central unit (31) is set up to determine a first control signal (A1) for the first stepper drive controller (22) and a second control signal (A2) for the second stepper drive controller (25), as a function of the kinematic reference value (PS) and the tensioning reference value (VS),
• wherein the first control signal (A1) and the second control signal (A2) are predetermined in such a manner to generate tensioning moments (M23, M26) in opposite directions in the two stepper motors (23, 26), when applied in each instance,
• wherein the central unit (31) is set up to transmit the first control signal (A1) to the first stepper drive controller (22) and the second control signal (A2) to the second stepper drive controller (25),
• and wherein the first stepper drive controller (22) is set up to control the first stepper motor (23) as a function of the first control signal (A1) and the second stepper drive controller (25) is set up to control the second stepper motor (26) as a function of the second control signal (A2), so that a tensioning state is generated in the coupling unit (18).