Abstract: A method for operating an electrical machine (1) for the production of electrical power (13) includes an excitation winding (2) and a stator winding (4). A converter configuration (6), e.g., a pulse-width modulation inverter, is located downstream from the electrical machine (1). In the lower speed range, the output of electrical power (12) takes place along the torque line (29) independently of the number of coils w1, w2 in a stator winding (4). In the upper speed range, the output of electrical power (12) takes place via a stator winding (4) having a small number of coils w2.

Abstract: An electrical machine, in particular a starter-generator, having a permanent-magnetically excitable rotor (19) and a stator (16), the stator (16) carrying a multiphase winding (38) is proposed, having an inverter (22) which is variable by means of a regulating or control device (23) and by which the stator (16) can be operated in the field attenuation mode; the rotor (19) has a number of teeth equivalent to n times the number of phases of the multiphase winding (38) in the stator (16), and each phase winding (36) comprises at least one coil (34), and all the coils (34) of the multiphase winding (38) are disposed side by side in the stator (16), and the rotor (19) has a number of poles equivalent to n times the number 4, one pole (32) of the stator (16) having a maximum width of a pole pitch (Tp), and the spacing (A) of two poles (32) of the stator (16) being equivalent to at least one-third the pole pitch (Tp).

Abstract: The invention relates to a method for regulating an electrical machine (1) with an excitation winding (2) and a stator winding (3). The stator winding (3) is connected at its output terminals (10) to a converter bridge (5). The electrical machine (1) can be operated in the regulation ranges of field-oriented regulation (11), field-weakening operation (12), and diode operation (13). The transition from one of the regulation ranges (11, 12, 13) to a respective adjacent regulation range (11, 12, 13) is achieved through an overmodulation of the pulse-to-width modulation (26) and a limitation of the outputs from current regulators (34, 35) of the stator winding (3) of the electrical machine (1).

Abstract: Lamination packet, in particular for electrical machines and devices, having a plurality of laminations (2) arranged flat against each other, and having at least one thermal-conduction ply arranged flat against one lamination (2), whereby the thermal conductivity of the thermal-conduction ply is greater than the thermal conductivity of the lamination (2).

Abstract: A method and an apparatus for determining a torque (MGL) of an electrical machine (19), in particular a generator (19) in a motor vehicle, are proposed. The method and the apparatus are characterized in that by a unit (43), the torque (MGL) of the electrical machine (19) is ascertained as a function of a current electrical power (PG) of the generator (19), a current generator rpm (NG), and a current generator efficiency (nG).

Abstract: The invention is based on a method for operating an electrical machine (1) for the production of electrical power (13) comprising an excitation winding (2) and a stator winding (4). A converter configuration (6), e.g., a pulse-width modulation inverter, is located downstream from the electrical machine (1). In the lower speed range, the output of electrical power (12) takes place along the torque line (29) independently of the number of coils w1, w2 in a stator winding (4). In the upper speed range, the output of electrical power (12) takes place via a stator winding (4) having a small number of coils w2.

Abstract: The invention relates to a method for determining the position of a rotating component of a claw pole machine (1), which is operated in the R-S-T-system and whose regulation requires the transformation of the stator values from the R-S-T-system into the d, q-system and vice versa. The claw pole machine (1) as an overall system (15) is divided into a non-detectable subsystem (18) and a detectable subsystem (19), which contains a filter element (20). The filter element (20) contained in the detectable subsystem (19, 29) supplies the output values (17).

Abstract: An electrical machine, in particular a starter-generator, having a permanent-magnetically excitable rotor (19) and a stator (16), the stator (16) carrying a multiphase winding (38) is proposed, having an inverter (22) which is variable by means of a regulating or control device (23) and by which the stator (16) can be operated in the field attenuation mode; the rotor (19) has a number of teeth equivalent to n times the number of phases of the multiphase winding (38) in the stator (16), and each phase winding (36) comprises at least one coil (34), and all the coils (34) of the multiphase winding (38) are disposed side by side in the stator (16), and the rotor (19) has a number of poles equivalent to n times the number 4, one pole (32) of the stator (16) having a maximum width of a pole pitch (Tp), and the spacing (A) of two poles (32) of the stator (16) being equivalent to at least one-third the pole pitch (Tp).

Abstract: The invention relates to a method for regulating an electrical machine (1) with an excitation winding (2) and a stator winding (3). The stator winding (3) is connected at its output terminals (10) to a converter bridge (5). The electrical machine (1) can be operated in the regulation ranges of field-oriented regulation (11), field-weakening operation (12), and diode operation (13). The transition from one of the regulation ranges (11, 12, 13) to a respective adjacent regulation range (11, 12, 13) is achieved through an overmodulation of the pulse-to-width modulation (26) and a limitation of the outputs from current regulators (34, 35) of the stator winding (3) of the electrical machine (1).

Abstract: Frequency converters for converting electrical energy, in particular for a vehicle electrical system, are proposed which have individual partial frequency converters and include at least one half bridge, as a result of which there are at least one high-side switch and one low-side switch with a predeterminable number of switches. The high-side switch and low-side switch have a common connection that is connected to means that produce the electrical energy. Parallel to the half bridge, there is an intermediary circuit capacitor whose capacitance should be as low as possible. To this end, the switches of the half bridge are triggered offset from one another so that the current to be supplied by the intermediary circuit capacitor remains as low as possible. Various possibilities are disclosed for the arrangement of the chokes of the frequency converter.

Abstract: Devices and methods for controlling a generator with an associated voltage converter that functions as a step-up converter are disclosed, in which the control of the generator is done as a function of its rpm and/or as a function of the rpm-dependent possible output voltage of the generator. Three different ranges are defined, in each of which different control actions are performed: at low rpm, a power control at the maximum allowable exciter current; at higher rpm levels, a voltage control by influencing the exciter current; and at an overvoltage at higher rpm and a sudden load reduction, a third control strategy, which reduces the overvoltage and the exciter current.

Abstract: An electrical voltage supply system includes an alternator having phase windings, it being possible to connect the alternator to a battery, and which is part of a first vehicle electrical system. The output of the alternator leads via a rectifier bridge and a voltage transformer operating as a step-up transformer to a second vehicle electrical system which has a markedly higher voltage and has usually no battery. To supply voltage to the loads of the vehicle electrical system which is operated at a higher voltage even during a standstill of the alternator, the alternator is then connected to the battery of the vehicle electrical system, and the higher voltage is obtained with the assistance of the step-up transformer, the step-up transformer operating in such a manner that is uses the alternator inductance as a choke.