Abstract: The invention relates to a method for operating an electric machine (2) comprising a rotatably mounted rotor and a motor winding that is electrically connected to an electrical energy store (4) by means of a power electronics (3). In said method, the machine (2) and/or an apparatus comprising the machine (2) is/are monitored in respect of fault events, and the motor winding is short-circuited by triggering the power electronics (3) upon detection of a fault event.

Abstract: The invention relates to a method for operating an electric machine (2), in particular in a motor vehicle, the machine (2) comprising a rotatably mounted rotor and a motor winding that is electrically connected to an electrical energy store (4) by means of a power electronics (3). In said method, by triggering the power electronics (3), the electric machine (2) is controlled in a field-oriented manner in such a way that the machine (2) generates a specified desired torque (Ttarget). According to the invention, when it is ascertained that based on a current actual working point (AP1) of the electric machine (2) a specified desired working point (AP2) of the electric machine (2) should be set at least substantially in a time-optimized manner, a predicted pilot control action is specified, and that the desired working point (AP2) is set by triggering the power electronics (3) according to the predicted pilot control action.

Abstract: A method (100) for calibrating an offset angle (PhiO) for field-oriented control of an electric machine (210) between an angle signal (W) of a position encoder (220) and the direction of the rotor flux (RF), having the steps of: periodically varying (120) a current vector (Is) along a line of constant torque; ascertaining (130) a speed signal (n_t) of the position encoder (220) of the electric machine (210); calibrating (140) the offset angle (PhiO) on the basis of the ascertained speed signal (n_t).

Abstract: The invention relates to a method for calibrating the control of an electrical machine, comprising the steps of: applying at least one electrical test signal having a specified direction in a d-q coordinate system to the electrical machine; measuring the change in the rotor angle of a rotor of the electrical machine according to the applied at least one electrical test signal; and calibrating the control of the electrical machine, the control being carried out using the d-q coordinate system, and the orientation of the d-q coordinate system being determined on the basis of the measured change in the rotor angle of the rotor of the electrical machine.

Abstract: The invention relates to a method for determining a gain error of at least one current measuring device (8, 9, 10) of a sensor unit (7) of an electric machine (1), wherein the machine (1) has a stator winding (2) having at least three phases (U, V, W) and a rotor (5) which is mounted so as to be rotatable about an axis of rotation (6).

Abstract: The invention relates to a method for operating an electric machine (6), and to a control device (10) that is configured to carry out the method. The method comprises a normal mode (?normal) and a special mode (?special) in dependence on a preset target value (Mtarget), wherein the normal mode (?normal) comprises the steps of detecting an operating state, wherein, in the event that the detected operating state is a special state, the special mode (?special) is carried out. The special mode (?special) comprises the steps of modulating a cyclic value (Mcysl) on the present target value (Mtarget) and detecting the operating state, wherein, in the event that the operating state is a normal state, the normal mode (?normal) is carried out.

Abstract: The present invention relates to a control system (10) for an electric machine (EM), for producing a braking torque, by means of the electric machine (EM), in a traction drive, said system comprising a control device (SE), the control device (SE) being configured to control a generator voltage or a generator current in or through a power electronics system (LE) of the electric machine such that during a movement of the traction drive, the electric power (Pel) of the electric machine (EM) can be limited to a level at least below a predefined minimum value.

Abstract: A method (100) for calibrating an offset angle (PhiO) for field-oriented control of an electric machine (210) between an angle signal (W) of a position encoder (220) and the direction of the rotor flux (RF), having the steps of: periodically varying (120) a current vector (Is) along a line of constant torque; ascertaining (130) a speed signal (n_t) of the position encoder (220) of the electric machine (210); calibrating (140) the offset angle (PhiO) on the basis of the ascertained speed signal (n_t).

Abstract: The invention relates to a method for calibrating the control of an electrical machine, comprising the steps of: applying at least one electrical test signal having a specified direction in a d-q coordinate system to the electrical machine; measuring the change in the rotor angle of a rotor of the electrical machine according to the applied at least one electrical test signal; and calibrating the control of the electrical machine, the control being carried out using the d-q coordinate system, and the orientation of the d-q coordinate system being determined on the basis of the measured change in the rotor angle of the rotor of the electrical machine.

Abstract: The present invention relates to a control system (10) for an electric machine (EM), for producing a braking torque, by means of the electric machine (EM), in a traction drive, said system comprising a control device (SE), the control device (SE) being configured to control a generator voltage or a generator current in or through a power electronics system (LE) of the electric machine such that during a movement of the traction drive, the electric power (Pel) of the electric machine (EM) can be limited to a level at least below a predefined minimum value.

Abstract: The invention relates to a method for determining the position (?R) and the rotational speed (nR) of a rotor of an electrical machine during an active short circuit and a rotor-state determining device (10) designed to carry out the method.

Abstract: The invention relates to a method for determining a gain error of at least one current measuring device (8, 9, 10) of a sensor unit (7) of an electric machine (1), wherein the machine (1) has a stator winding (2) having at least three phases (U, V, W) and a rotor (5) which is mounted so as to be rotatable about an axis of rotation (6).

Abstract: The invention relates to a method for operating an electric machine (6), and to a control device (10) that is configured to carry out the method. The method comprises a normal mode (?normal) and a special mode (?special) in dependence on a preset target value (Mtarget), wherein the normal mode (?normal) comprises the steps of detecting an operating state, wherein, in the event that the detected operating state is a special state, the special mode (?special) is carried out. The special mode (?special) comprises the steps of modulating a cyclic value (Mcysl) on the present target value (Mtarget) and detecting the operating state, wherein, in the event that the operating state is a normal state, the normal mode (?normal) is carried out.

Abstract: The invention relates to a method for determining the position (OR) and the rotational speed (nR) of a rotor of an electrical machine during an active short circuit and a rotor-state determining device (10) designed to carry out the method.

Abstract: The present invention discloses a method for determining a rotor angle of a rotor of an electric machine, having the steps of producing a torque-dependent test signal which depends on the torque of the electric machine and has a higher frequency than a supply signal for the electric machine, controlling the electric machine using the supply signal and the test signal which is superimposed on the supply signal, recording phase currents of the electric machine, and determining the rotor angle of the rotor of the electric machine on the basis of the effects of the test signal on the phase currents. The present invention also discloses an angle determination apparatus and a corresponding control apparatus.

Abstract: The invention relates to a method for measuring the torque of a drive unit (10), particularly a vehicle drive unit (10), said drive unit (10) comprising at least one bearing (20) for connecting to a fixed support point (21), and at least one sensor (22) being provided which measures a change in force and/or position, particularly a relative rotation of the drive unit (10), as a sensor value, wherein a torque at the drive unit (10) is determined as a measurement value on the basis of said sensor value.

Abstract: The invention relates to a method (300) and a device (170) for reducing mechanical loads in a powertrain (100). An electric machine (130) is provided as the drive assembly of the powertrain (100), and an inverter (110) is provided in order to output a multiphase output voltage for supplying the electric machine (130). The method (300) has the following steps: determining (320) the multiphase output voltage (UA) for operating the electric machine (130); adding (340) a specifiable voltage (VU) and the specified output voltage (UA); and outputting (350) the sum (SU) of the multiphase output voltage (UA) and the specifiable voltage (VU) in order to supply the electric machine (130).

Abstract: The present invention discloses a method for determining a rotor angle of a rotor of an electric machine, having the steps of producing a torque-dependent test signal which depends on the torque of the electric machine and has a higher frequency than a supply signal for the electric machine, controlling the electric machine using the supply signal and the test signal which is superimposed on the supply signal, recording phase currents of the electric machine, and determining the rotor angle of the rotor of the electric machine on the basis of the effects of the test signal on the phase currents. The present invention also discloses an angle determination apparatus and a corresponding control apparatus.

Abstract: The invention is a pulse-controlled inverter with one or more semiconductor switches and freewheeling diodes arranged in parallel to each semiconductor switch. The semiconductor switches are triggered only when the current does not flow through a freewheeling diode that is arranged in parallel to the semiconductor switch. This allows the number of triggering processes for the semiconductor switch to be reduced. The reduced number of triggering processes for the semiconductor switches results in lower power losses and an increased service life of the entire system.

Abstract: The invention relates to a method for measuring the torque of a drive unit (10), particularly a vehicle drive unit (10), said drive unit (10) comprising at least one bearing (20) for connecting to a fixed support point (21), and at least one sensor (22) being provided which measures a change in force and/or position, particularly a relative rotation of the drive unit (10), as a sensor value, wherein a torque at the drive unit (10) is determined as a measurement value on the basis of said sensor value.