Abstract: An electric drive includes a rotor and a stator in toothed-coil technology, wherein the stator has a number of individual tooth modules. A respective individual tooth module has a stator winding which is wound around an associated tooth, a control device which is designed to generate an activation signal for the stator winding, and a shielding device which surrounds the stator winding and the control device.

Abstract: A drive system has an electric motor, wherein the electric motor includes a first three-phase stator winding system and a second three-phase stator winding system. The first and the second stator winding system are arranged on the stator in a manner rotated through an electrical phase angle in relation to one another. The drive system includes a frequency converter, wherein the frequency converter has a first bridge circuit arrangement which is designed to generate voltages for the first winding system and a second bridge circuit arrangement which is designed to generate voltages for the second winding system. The first bridge circuit arrangement and the second bridge circuit arrangement are connected in series. A control device is designed to actuate the first bridge circuit arrangement and the second bridge circuit arrangement.

Abstract: An electric drive includes a rotor and a stator in toothed-coil technology, wherein the stator has a number of individual tooth modules. A respective individual tooth module has a stator winding which is wound around an associated tooth, a control device which is designed to generate an activation signal for the stator winding, and a shielding device which surrounds the stator winding and the control device.

Abstract: A drive system has an electric motor, wherein the electric motor includes a first three-phase stator winding system and a second three-phase stator winding system. The first and the second stator winding system are arranged on the stator in a manner rotated through an electrical phase angle in relation to one another. The drive system includes a frequency converter, wherein the frequency converter has a first bridge circuit arrangement which is designed to generate voltages for the first winding system and a second bridge circuit arrangement which is designed to generate voltages for the second winding system. The first bridge circuit arrangement and the second bridge circuit arrangement are connected in series. A control device is designed to actuate the first bridge circuit arrangement and the second bridge circuit arrangement.

Abstract: A circuit and a method operate an electrical machine connected to at least three phases of a power supply network through a frequency converter that has a DC link. By a synchronous inverter that is actuated by a DC chopper and has two bridge halves switching the positive and the negative half-waves respectively, the energy generated by the machine is fed back into the power supply network. Accordingly, the synchronous inverter has an asymmetrical configuration such that, to switch the potential tapped from the DC link by the DC chopper, switching is carried out by a first bridge half that is formed from thyristors as electronic switches, and such that the second bridge half contains reverse-blocking electronic switches able to be switched off.

Abstract: A method is provided for generating a digital signal (DS) from an analog signal (IA, UA) generated by a frequency converter on the basis of pulse width modulation, wherein the digital signal corresponds to a mean value of the analog signal over a period of the pulse width modulation. The method includes the acts of: generating a bit stream (BS(i)) with a predetermined bit repetition duration (BW) depending on the analog signal by way of a sigma-delta modulator (1) and, during a time interval which has a duration which is at least as great as the period of the pulse width modulation: multiplying a respective bit (BS(i)) of the bit stream by a corresponding rating coefficient (BK(i)) for generating a respective bit/rating coefficient product and summing the respective bit/rating coefficient products, wherein the sum represents the digital signal.

Abstract: A method is provided for generating a digital signal (DS) from an analog signal (IA, UA) generated by a frequency converter on the basis of pulse width modulation, wherein the digital signal corresponds to a mean value of the analog signal over a period of the pulse width modulation. The method includes the acts of: generating a bit stream (BS(i)) with a predetermined bit repetition duration (BW) depending on the analog signal by way of a sigma-delta modulator (1) and, during a time interval which has a duration which is at least as great as the period of the pulse width modulation: multiplying a respective bit (BS(i)) of the bit stream by a corresponding rating coefficient (BK(i)) for generating a respective bit/rating coefficient product and summing the respective bit/rating coefficient products, wherein the sum represents the digital signal.