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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

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, w2in 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.

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1. A method for operating an electrical machine ( 1) for an output of electrical power (12) comprising an excitation winding (2) and a stator winding (4), wherein a converter configuration is located downstream of the electrical machine, wherein, in a range of an idle speed of an internal combustion

1. A method for operating an electrical machine ( 1) for an output of electrical power (12) comprising an excitation winding (2) and a stator winding (4), wherein a converter configuration is located downstream of the electrical machine, wherein, in a range of an idle speed of an internal combustion engine, the output of electrical power (12) takes place along a torque line (29) independently of a number of coils w1, w2and, in a speed range above the idle speed of the internal combustion engine, the output of electrical power (12) takes place via an electrical machine (1) having a stator winding (4) comprising a small number of coils w2, wherein a voltage difference between a vehicle electrical system (10) of a motor vehicle and machine terminals (5) is compensated for by means of a pulse-width modulation inverter (6), wherein the pulse-width modulation inverter is configured to include semi-conductor components arranged in parallel to one-way diodes, thereby enabling operation of the engine over an entire range of operation.2. The method according to claim 1, wherein, in the idle speed range of the internal combustion engine, the power output (12) of the electrical machine (1) takes place via a configuration of the pulse-width modulation inverter (6).3. The method according to claim 1, wherein the pulse-width modulation inverter (6) processes a current that is inversely proportional to the number of coils of the stator winding (4) of the electrical machine (1).4. The method according to claim 1, wherein the output of electrical power (12) above the idle speed range takes place according to a power curve (24) of an electrical machine (1) having a small number of coils w2.5. The method according to claim 1, wherein by operating the electrical machine (1) using a pulse-width modulation inverter (6), the number of stator windings can be selected independently of an inception speed (25.1,25.2).6. The method according to claim 1, wherein, in a speed range below the idle speed range, the output of electrical power (12) takes place up to a maximum value (27) according to the torque line (29) via the pulse-width modulation inverter (6).7. The method according to claim 1, wherein an average efficiency of the electrical machine (1) is increased by outfitting the electrical machine (1) with a selectively minimal number of coils w2.