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

Claim 11:
12. 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 at a first instant, the moment of inertia of the load is determined as a first quotient, reduced by the moment of inertia of the drive train, of the torque actual value and the angular acceleration actual value α_ist, and the angular acceleration actual value lies in a first value range;
wherein at a second instant after the first instant, the moment of inertia of the load is determined as a second quotient, reduced by the moment of inertia of the drive train, of the torque actual value and the angular acceleration actual value, and the angular acceleration actual value lies in a second value range; and
wherein an updated moment of inertia of the load is determined by adding to the previously determined value of the moment of inertia of the load a difference between the second quotient and the first quotient.