Control device for a drive system, drive system, method

An electrical drive system comprising an electrical motor (2) electrically connected by a power electronics unit (7) to an electric power storage device (6), further comprising a control device (8) having:

• a computing unit (12) and a plurality of gate driver circuits (13, 14) and being configured to set a safe operational state in the power electronics unit (7) when a fault in the drive system (1) and/or the control device (8) is detected, wherein that the computing unit (12) is configured to determine a control instruction in accordance with a current actual rotational speed (nIst) of the motor (2) and to store the control instruction in the gate driver circuits (13, 14) and that the gate driver circuits (13, 14) set the safe operational state according to the stored control instruction when a fault is detected, wherein the computing unit (12) is configured to predict a maximum rotational speed (npred) which the motor (2) can reach as a maximum from the current actual rotational speed (nIst) within a predetermined first time interval (FHTI) and determine the control instruction as a function of the predicted maximum rotational speed (npred), and wherein the predetermined first time interval (FHTI) is between 50 ms and 300 ms.

A method for operating an electric drive system (1) which has an electric motor (2) electrically connected by a power electronics unit (7) to an electric power storage device (6), and a control device (8) for controlling the power electronics unit (7), wherein the control device (8) comprises a computing unit (12) and a plurality of gate driver circuits (13, 14), wherein the computing unit (12) determines a control instruction as a function of a current actual rotational speed (nIst) of the motor (2) and stores it in the gate driver circuits (13, 14), wherein the drive system (1) is monitored for faults, wherein the gate driver circuits (13, 14) set a safe operational state according to a saved control instruction when a fault is detected, and wherein the computing unit (12) is configured to predict a maximum rotational speed (npred) which the motor (2) can reach as a maximum from the current actual rotational speed (nIst) within a predetermined first time interval (FHTI) and determine the control instruction as a function of the predicted maximum rotational speed (npred), and wherein the predetermined first time interval (FHTI) is between 50 ms and 300 ms.