Patent ID: 12244190

In the figures, identical and functionally identical elements are provided with the same reference numerals.

DETAILED DESCRIPTION OF THE DRAWINGS

FIG.1shows a rotor1for an electrically excited drive machine of an electrified motor vehicle. The rotor1has a rotor core2which can be formed as a laminated core consisting of axially stacked electric laminations. Moreover, the rotor1has a rotor shaft3which is connected fixedly to the rotor core2for conjoint rotation, for the transmission of torque. Here, the rotor core2has a solid pole geometry which is formed by a closed outer side4, gapless in the circumferential direction, of the rotor core2and therefore of the entire rotor1. This closed outer side4minimizes the air friction losses and increases the mechanical stability of the rotor1.

Here, the rotor core2has six rotor poles5which in each case have a pole shank6, as can be seen inFIG.2. Here, the respective pole shanks6are of salient pole-shaped configuration and extend through a pole center of the respective rotor pole5. Pole shoe-shaped regions7of the salient pole-shaped pole shanks6are connected here via connecting webs8which are configured in one piece with the regions7, with the result that the closed, gapless outer side4is configured. Pole gaps are configured adjacently to opposite flanks (along the circumferential direction) of the pole shanks6, which pole gaps extend in the direction of pole edges of the rotor poles5. Here, the pole gaps are delimited in the direction of the pole edges by supporting web arrangements9, in each case one supporting web arrangement9being arranged between the pole gaps of two adjacent rotor poles5. Here, the supporting web arrangements9are of V-shaped configuration, with the result that respective cavities10which reduce weight and flux leakage are configured in the rotor core2between the supporting web arrangements9and the connecting webs8.

The pole shanks6in each case hold a winding11which has two coil units11a,11bhere. The coils11are interconnected to form a rotor winding12. Here, the coil units11a,11bof a rotor pole5can be interconnected in different ways, for example in series, in a manner which is dependent on the operating point of the electric drive machine. For example, the rotor winding12therefore has only the interconnected first coil units11aor the interconnection consisting of first and second coil units11a,11b. As a result of the possibility of it being possible for the second coil units11bto be connected in, the rotor winding12has an adjustable number of windings which in turn influences loss of the electric drive machine. For operating point-dependent interconnecting of the coil units11a,11band for connecting the windings11to the rotor winding12, the rotor1has an interconnecting device13. The interconnecting device13is connected to the rotor shaft3here.

FIG.3shows the two coil units11a,11bof a rotor pole5in an enlarged illustration. The coil units11a,11bare configured as shaped rod coil units with longitudinal shaped rods14a,14band transverse shaped rods15a,15b. Here, the longitudinal shaped rods14awhich correspond to the first winding unit11aare plugged axially into first pole gaps16a, and the longitudinal shaped rods14bwhich correspond to the second winding unit11bare plugged axially here into second pole gaps16b. The first longitudinal shaped rods14aare connected via first transverse shaped rods15a, and the second longitudinal shaped rods14bare connected via second transverse shaped rods15b. The longitudinal shaped rods14a,14band the transverse shaped rods15a,15bare welded, in particular.

Moreover, the coil units11a,11bhave feed lines17a,17band return lines18a,18bwhich are configured here by connector shaped rods19. In the case of non-interconnected coil units11a,11b, the respective first feed lines17aand the first return lines18aand, in the case of interconnected coil units11a,11b, the respective first feed lines17aand the second return lines18bform input connectors and output connectors of the respective windings11. One of the input connectors forms an overall input connector20of the rotor winding12, and one of the output connectors forms an overall output connector21of the rotor winding12. The overall input connector20and the overall output connector21are connected to a contact ring22of a contact ring module of the rotor1, which contact ring22is connected to the rotor shaft3.

The connector shaped rods19are integrated into the interconnecting device13, where they are electrically connected to switching units (not shown here) of the interconnecting device13. Here, the interconnecting device13has a housing23, in which the connector shaped rods19are arranged in regions. In the case of the arranging of the annular disk-shaped housing23on the rotor shaft23, the connector shaped rods are arranged on the respective longitudinal shaped rods14a,14b,15a,15which configure a winding start and a winding end of the respective winding11a,11b, and are connected to them, for example welded. Moreover, winding heads of the rotor winding12which are formed by the transverse shaped rods15a,15bare encapsulated by a supporting ring24in order to absorb centrifugal forces.

The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.