Patent ID: 11945314
Assignee: SEW-EURODRIVE GMBH & CO. KG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H  Y | IPC B

Claim 10:
11. A method, comprising:
supplying a motor voltage to the electric motor via a converter to achieve a torque setpoint value;
determining an angular velocity actual value and an angular acceleration actual value from acquired values of the angular position of the rotor;
determining the torque setpoint value from a total moment of inertia and an angular acceleration setpoint value determined as an actuation variable by an rpm control member to which a difference between the angular velocity actual value and an angular velocity setpoint value is supplied;
determining the total moment of inertia as a sum of a moment of inertia of the drive train without a load and a moment of inertia of the load;
determining the moment of inertia of the load from a torque actual value and from the angular acceleration actual value, taking into account the moment of inertia of the drive train;
wherein the rpm control member includes a PI controller, having a proportional element and an integral element arranged in parallel with the proportional element; and
wherein a proportionality constant of the proportional element is a function of a product of the moment of inertia of the drive train and the moment of inertia of the load, and/or a time constant of the integral element is a function of a product of the moment of inertia of the drive train and the moment of inertia of the load.