Electric drive system

An electrical drive system, comprising:

• a motor with a motor shaft,
• a load device which is movable along a path;
• a coupling unit which is configured to convert a rotational movement of the motor shaft into a movement of the load device along the path, wherein the coupling unit is subject to slip;
• a motor sensor for ascertaining a rotation angle position of the motor shaft;
• a load sensor for ascertaining a load sensor-based position of the load device;
• and
• an electronic control apparatus connected to the motor sensor and the load sensor, the electronic control apparatus being configured to:
• calculate a motor sensor-based position of the load device based on a change in the rotation angle position of the motor shaft, which change is ascertained by the motor sensor,
• after each change in the rotation angle position of the motor shaft by a reference value, (i) calculate a slip based on a difference between the motor sensor-based position and the load sensor-based position, and (ii) set the motor sensor-based position to the load sensor-based position when the slip is smaller than a slip threshold value, and assume a fault state when the slip is greater than the slip threshold value.