Abstract:
The invention relates to an electric drive system, comprising an n-phase electric machine, n>1, which has at least two single-phase winding strands, a first inverter, the output connection of which is connected to the phase connection of a first of the single-phase winding strands of the electric machine, at least one second inverter, the output connection of which is connected to the phase connection of a second of the single-phase winding strands of the electric machine, and a DC voltage source which has a plurality of series-connected battery modules and the output connections of which are respectively connected to the input connections of the first inverter and to the input connections of the second inverter, so that the first inverter and the second inverter are arranged in parallel.
Abstract:
A method for determining state variables of an electric motor for driving a motor vehicle, comprising the procedural steps: measuring (102, 104) data (103, 105) which comprise information about a current state of vehicle components (10, 12, 30, 40); converting (110) the measured data (103, 105) into data (111) related to the electric motor (10) using a vehicle model of the motor vehicle (1); evaluating (120) the data (111) related to the electric motor (10) using a machine model of the electric motor (10) for determining at least one first state variable (121) of the electric motor (10); determining (130) at least one second state variable (131) of the electric motor (10) using a sensorless method; comparing and assessing for plausibility (140) the at least one first and the at least one second state variable (121, 131).
Abstract:
The present invention provides control of a synchronous machine with non-sinusoidal current-voltage profiles. The synchronous machine is controlled in a field-oriented coordinate system. In this case, the transformation between field-oriented coordinate system and stator-oriented coordinate system is effected by specific, adapted transformations which take account of the non-sinusoidal signal profiles during the driving of the synchronous machine, such that the latter correspond to current-voltage profiles progressing in a constant fashion in the field-oriented coordinate system. What is achieved thereby is that the non-sinusoidal current-voltage profiles need not be taken into account in any way in the design of the control system in the field-oriented coordinate system.
Abstract:
The invention relates to an electric drive system with an n-phase electric machine, n>1, having at least two multiphase winding strands; a first inverter, the output connections of which are connected to the phase connections of a first of the multiphase winding strands of the electric machine; a second inverter, which is connected in parallel to the first inverter and the output connections of which are connected to the phase connections of a second of the multiphase winding strands of the electric machine; and a DC voltage source, which has a plurality of battery modules connected in series and a first output connection of which is connected to a first input connection of the first inverter and second output connection of which is connected to a first input connection of the second inverter. A second input connection of the first inverter and a second input connection of the second inverter are connected to each other such that the first inverter and the second inverter are arranged in a series circuit, and the second input connection of the first inverter and the second input connection of the second inverter are connected to a center tap of the DC voltage source between two sub-groups of the battery modules connected in series.
Abstract:
An electric vehicle axle mechanism comprising: at least one vehicle axle; a gear mechanism connected to the vehicle axle; an electric motor that comprises a rotor and that is connected to the gear mechanism for transmitting a torque to the at least one vehicle axle; a position sensing device for ascertaining a rotor position of the rotor; an electronic power unit that is connected to the electric motor for supplying electrical energy to the electric motor, wherein the electronic power unit furthermore comprises an evaluating device for evaluating the signals of the position sensing device and is connected to an evaluating device that is embodied as a separate device, wherein the position sensing device is integrated at least in part in the electronic power unit or the evaluating unit.
Abstract:
An electric vehicle axle mechanism comprising: at least one vehicle axle; a gear mechanism connected to the vehicle axle; an electric motor that comprises a rotor and that is connected to the gear mechanism for transmitting a torque to the at least one vehicle axle; a position sensing device for ascertaining a rotor position of the rotor; an electronic power unit that is connected to the electric motor for supplying electrical energy to the electric motor, wherein the electronic power unit furthermore comprises an evaluating device for evaluating the signals of the position sensing device and is connected to an evaluating device that is embodied as a separate device, wherein the position sensing device is integrated at least in part in the electronic power unit or the evaluating unit.
Abstract:
The present invention provides control of a synchronous machine with non-sinusoidal current-voltage profiles. The synchronous machine is controlled in a field-oriented coordinate system. In this case, the transformation between field-oriented coordinate system and stator-oriented coordinate system is effected by specific, adapted transformations which take account of the non-sinusoidal signal profiles during the driving of the synchronous machine, such that the latter correspond to current-voltage profiles progressing in a constant fashion in the field-oriented coordinate system. What is achieved thereby is that the non-sinusoidal current-voltage profiles need not be taken into account in any way in the design of the control system in the field-oriented coordinate system.
Abstract:
The present invention provides control for synchronous machines in order to achieve an approximately constant torque irrespective of the load angle. The induced voltage of the synchronous machine rotating with a zero-current of the stator is first determined. Starting from the voltage plot of the induced voltage over the load angle, a current plot which achieves a constant torque irrespective of the load angle or any other default settings, can then be calculated. In particular, a non-sinusoidal current plot can also be calculated for non-sinusoidal plots of the induced voltage in the synchronous machine, in order to achieve desired settings that are as constant as possible irrespective of the load angle of the synchronous machine.
Abstract:
The invention relates to an electric drive system with an n-phase electric machine, n>1, having at least two multiphase winding strands; a first inverter, the output connections of which are connected to the phase connections of a first of the multiphase winding strands of the electric machine; a second inverter, which is connected in parallel to the first inverter and the output connections of which are connected to the phase connections of a second of the multiphase winding strands of the electric machine; and a DC voltage source, which has a plurality of battery modules connected in series and a first output connection of which is connected to a first input connection of the first inverter and second output connection of which is connected to a first input connection of the second inverter. A second input connection of the first inverter and a second input connection of the second inverter are connected to each other such that the first inverter and the second inverter are arranged in a series circuit, and the second input connection of the first inverter and the second input connection of the second inverter are connected to a center tap of the DC voltage source between two sub-groups of the battery modules connected in series.
Abstract:
The invention relates to a system comprising an energy storage device and a DC voltage supply circuit, wherein the energy storage device has at least two energy supply branches connected in parallel, which energy supply branches are each coupled, at a first output, to at least one output connection of the energy storage device for generating an AC voltage at the output connections and, at a second output, to a common busbar, wherein each of the energy supply branches has a multiplicity of energy storage modules connected in series. The energy storage modules each comprise an energy storage cell module, which has at least one energy storage cell, and a coupling device comprising a coupling bridge circuit comprising coupling elements, wherein the coupling elements are designed to switch the energy storage cell module selectively into the corresponding energy supply branch or to bypass said energy storage cell module in the energy supply branch. The DC voltage supply circuit has a bridge circuit comprising a multiplicity of first feed connections, which are each coupled to one of the output connections of the energy storage device, two feed nodes, of which at least one is coupled to the bridge circuit, and a module tap circuit, which has at least two module switching branches comprising a commutation diode, wherein one of the module switching branches connects a first input connection of the energy storage cell module of at least one energy storage module of one of the energy supply branches switchably to a first of the feed nodes, and another of the module switching branches connects a second input connection of the energy storage cell module of the at least one energy storage module switchably to a second of the feed nodes.