Electrical drive system , comprising: - a motor comprising a motor shaft , - a load device which can be moved along a path, - a coupling unit which is designed 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 - being connected to the motor sensor and the load sensor , - 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 , - and being configured, after each change in the rotation angle position of the motor shaft by a reference value, to calculate a slip based on a difference between the motor sensor-based position and the load sensor-based position, characterized in that - the electronic control apparatus is further configured - to set the motor sensor-based position to the load sensor-based position when the slip is smaller than a slip threshold value; - to assume a fault state when the slip is greater than the slip threshold value; - and to calculate an amount of wear, which is associated with the coupling unit , based on the slip . - a motor comprising a motor shaft , - a load device which can be moved along a path, - a coupling unit which is designed 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 - being connected to the motor sensor and the load sensor , - 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 , - and being configured, after each change in the rotation angle position of the motor shaft by a reference value, to calculate a slip based on a difference between the motor sensor-based position and the load sensor-based position, - being connected to the motor sensor and the load sensor , - 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 , - and being configured, after each change in the rotation angle position of the motor shaft by a reference value, to calculate a slip based on a difference between the motor sensor-based position and the load sensor-based position, - the electronic control apparatus is further configured - to set the motor sensor-based position to the load sensor-based position when the slip is smaller than a slip threshold value; - to assume a fault state when the slip is greater than the slip threshold value; - and to calculate an amount of wear, which is associated with the coupling unit , based on the slip . - to set the motor sensor-based position to the load sensor-based position when the slip is smaller than a slip threshold value; - to assume a fault state when the slip is greater than the slip threshold value; - and to calculate an amount of wear, which is associated with the coupling unit , based on the slip . <EOS>