Rotor and Rotor Circuit for an Electric Motor

A rotor circuit for a separately excited synchronous motor, comprising:

• a rotor comprising:
• a rotor body;
• and
• an even number, n, of pole pairs arranged on the rotor body with one rotor winding, respectively, wherein the rotor windings of the pole pairs are connected in series as a series circuit between two electrical connections of the rotor used to supply or conduct away an electrical excitation current through the rotor windings;
• wherein the series circuit has a first section comprising a first n/2 rotor windings, from a first of the two electrical connections, arranged first in the series circuit, and a second section comprising a second n/2 rotor windings arranged upstream of a second of the two electrical connections;
• and
• wherein the rotor windings and the series circuit are designed in such a way that during application of a direct-current voltage between the two electrical connections in each of the rotor windings of the first section, a radial component of the direct-current flow present in the series circuit extends through an entire respective rotor winding, from an outer side to an inner side of the rotor winding, and in each of the rotor windings of the second section, in reverse, from an outer side to an inner side of the rotor winding;
• a first supply line for connecting a first pole of a direct-current supply to the first of the two electrical connections of the rotor and a second supply line for connecting a second opposing pole of the direct-current supply to the second of the two electrical connections of the rotor;
• and
• a capacitive voltage divider connected at a first connection between the first supply line and the second supply line with a first Y-capacitor between the first supply line and an electrically conductive connection to the rotor body and a second Y-capacitor between the first connection and the second supply line.

A separately excited synchronous motor for an electrically driven vehicle, comprising:

• a rotor comprising:
• a rotor body;
• and
• an even number, n, of pole pairs arranged on the rotor body with one rotor winding, respectively, wherein the rotor windings of the pole pairs are connected in series as a series circuit between two electrical connections of the rotor used to supply or conduct away an electrical excitation current through the rotor windings;
• wherein the series circuit has a first section comprising a first n/2 rotor windings, from a first of the two electrical connections, arranged first in the series circuit, and a second section comprising a second n/2 rotor windings arranged upstream of a second of the two electrical connections;
• and
• wherein the rotor windings and the series circuit are designed in such a way that during application of a direct-current voltage between the two electrical connections in each of the rotor windings of the first section, a radial component of the direct-current flow present in the series circuit extends through an entire respective rotor winding, from an outer side to an inner side of the rotor winding, and in each of the rotor windings of the second section, in reverse, from an outer side to an inner side of the rotor winding;
• and
• a stator assigned to the rotor for generating an electromotive effect interacting between the stator and the rotor.