Patent application number | Description | Published |
20090167222 | METHOD AND DEVICE FOR DETERMINING THE TORQUE OF AN ELECTRIC MACHINE - A method for determining the torque of an electric machine, in particular a permanently energized electric machine. The torque is determined by a particularly simple and accurate method by measuring a phase voltage and the rotational speed of the electric machine and calculating the torque based on these values. | 07-02-2009 |
20110149621 | Method and device for optimizing a space vector pulse width modulation - In a method for optimizing a space vector pulse width modulation, a voltage is connected to a load, by combining discrete switching states of a plurality of switches to control the load, the load being switched to zero potential by two of the switching states. In the case the maximum degree of control is increased, during a pulse width modulation period, at least one of the switching states, that switches to zero potential, is omitted. | 06-23-2011 |
20120038295 | METHOD FOR OPERATING A POLYPHASE MACHINE HAVING A PULSE-WIDTH-MODULATED INVERTER - A method for operating a polyphase machine having a pulse-width-modulated inverter, having the steps: determining a setpoint current value respectively for a current in the longitudinal direction and/or the transverse direction based on a specified torque, ascertaining a setpoint voltage value respectively for a voltage in the longitudinal direction and/or the transverse direction with the aid of the setpoint current value and/or of an actual current value determined at the pulse-width-modulated inverter, controlling and/or regulating the polyphase machine corresponding to the ascertained setpoint voltage value. In this context it is provided that, in addition, using a model, a model value is determined respectively for the voltage in the longitudinal direction and/or the transverse direction, the difference between the setpoint voltage value and the model value is ascertained, and in response to the exceeding of a specifiable maximum difference, an error signal is triggered. | 02-16-2012 |
20120104845 | METHOD FOR OPERATING AN ELECTRICAL NETWORK, IN PARTICULAR OF A MOTOR VEHICLE - A method for operating an electrical network, in particular of a hybrid motor vehicle, the network having at least one electrical accumulator, in particular a high-voltage accumulator, at least one electric machine, and at least one inverter controlling the electric machine, the electrical accumulator being electrically disconnected from the network when a malfunction is detected and the inverter being switched to a short-circuit operating mode when a specifiable voltage limit of a network voltage of the network is subsequently exceeded. There is a provision for switching power semiconductors of the inverter in such a way that the driven electric machine induces a voltage and provides it via free-wheeling diodes on the electrical network and the induced voltage is used for operating the electric machine as a generator such that a specifiable network voltage is set by the electric machine. | 05-03-2012 |
20120278007 | METHOD FOR CHECKING THE PLAUSIBILITY OF THE TORQUE OF AN ELECTRIC MACHINE AND MACHINE CONTROLLER FOR CONTROLLING AN ELECTRIC MACHINE AND FOR CARRYING OUT THE METHOD - A method for checking the plausibility of a torque of an electric machine, calculated on the basis of a machine model, in which a first value of an electromagnetic power of the electric machine is determined from the calculated torque and a rotational speed of the electric machine. Stator current components and stator phase voltage components are calculated from the stator currents and the stator phase voltages with respect to a reference system, which is fixed in relation to the stator. A second value of the electromagnetic power of the electric machine is determined from the stator current components and the stator phase voltage components. If a deviation of the first value of the electromagnetic power of the electric machine from the second value exceeds a predefined power threshold value, the torque of the electric machine, calculated on the basis of the machine model, is classified as implausible. | 11-01-2012 |
20120323424 | METHOD FOR CONTROLLING AN ELECTRIC MOTOR - A method for controlling an electric motor for driving a motor vehicle with the aid of a drive train, including: measuring the rotation angle of a rotor of the electric motor multiple times, ascertaining the angular velocity and/or the angular acceleration of the rotor as a function of the detected rotation angle, controlling and/or regulating the energization of electromagnets of a stator of the electric motor, the physical behavior of the electric motor and/or the drive train and/or the motor vehicle detected in a physical model, and the rotation angle and/or the angular velocity and/or the angular acceleration ascertained from the measured values of the rotation angle of the rotor using the physical model, and the energization of electromagnets of the stator of the electric motor being carried out as a function of the rotation angle and/or the angular velocity and/or the angular acceleration ascertained using the physical model. | 12-20-2012 |
20130057185 | METHOD FOR STARTING A SYNCHRONOUS MACHINE - In a method for starting a synchronous machine, a default torque is predefined, and a rotational speed of the synchronous machine is adjusted after starting. A torque which is higher than the default torque is predefined, and the higher torque is reduced in the subsequent second step to a positive value which is less than the default torque, and is increased to the default torque in a third step. | 03-07-2013 |
20130074609 | METHOD FOR DETERMINING THE TORQUE OF AN ELECTRIC MOTOR - Method for determining torque of an electric motor on a vehicle, a torque being generated by an electric motor rotor and being transmitted from a drivetrain to at least one drive wheel, including: measuring the rotor rotation angle, determining the torque generated by the rotor, the at least one drive wheel driven by the rotor being fixed, the stationary rotor not generating any torque and a first rotation angle of the stationary rotor being measured, subsequently a torque applied by the rotor to the drivetrain, so that the rotor performs rotational movement due to the drivetrain stiffness, and subsequently, in an equilibrium state between the torque generated by the rotor and a counter torque of the drivetrain, a second rotation angle of the rotor being measured, the torque generated by the rotor and/or the total stiffness of the drivetrain being ascertained from the measured values of the rotor rotation angles. | 03-28-2013 |
20130320891 | CONTROL METHOD AND DEVICE FOR AN ELECTRIC MACHINE - A method is described for controlling an electric machine during a motor startup operation with the aid of a power electronics device, in particular for use in a motor vehicle. The power electronics device includes a plurality of controllable power switches which are connected for the purpose of supplying an electrical current to the electric machine in polyphase form. The power electronics device is controlled in such a way that the electric machine outputs a startup torque, and the control of the power electronics device for outputting the startup torque takes place in such a way that the switching position of at least two of the power switches is changed, with the result that the power switches are subjected to a more uniform load. | 12-05-2013 |
20140055068 | METHOD, DEVICE, AND COMPUTER PROGRAM FOR DETERMINING AN OFFSET ANGLE IN AN ELECTRIC MACHINE - The invention relates to a method and device for determining or checking the plausibility of an offset angle between an assumed orientation and an actual orientation of a rotor ( | 02-27-2014 |
20140125268 | METHOD AND DEVICE FOR OPERATING AN ELECTRICAL MACHINE HAVING SEPARATE EXCITATION - A method and a device for operating an electrical machine having separate excitation, especially a synchronous machine. With the aid of a sensor system, a variable characterizing a rotor temperature and/or a stator temperature are/is determined, and an excitation current and stator currents for the electrical machine are specified by a control unit as a function of the variable characterizing the rotor temperature and/or the stator temperature, at least in specifiable operating ranges. | 05-08-2014 |
20140184120 | METHOD AND APPARATUS FOR ESTIMATING ANGLES IN A SYNCHRONOUS MACHINE - The invention relates to an apparatus for estimating angles in a synchronous machine ( | 07-03-2014 |
20140257617 | ACTIVE DAMPING CONTROL FOR AN ELECTRIC VEHICLE OR HYBRID VEHICLE - The invention relates to a method ( | 09-11-2014 |