Rotor with Interconnectable Coils Units, Electric Drive Machine and Motor Vehicle

Abstract

A rotor for an electrically excited drive machine includes: a coil per rotor pole with, in each case, one first energizable coil unit, and a rotor core for holding the coils of the rotor poles. The coils have, in each case, at least one second energizable coil unit per rotor pole. The rotor has an interconnecting unit which is designed to interconnect the at least two coil units per coil in a manner which is dependent on an operating point of the electric drive machine in order to set the number of windings of the coil, and in order to electrically connect the coils of the rotor poles for configuring a rotor winding with an overall number of windings which is dependent on the numbers of windings of the coils.

Claims

1. A rotor for an electrically excited drive machine, comprising: a coil per rotor pole with, in each case, one first energizable coil unit; and a rotor core for holding the coils of the rotor poles, wherein the coils have, in each case, at least one second energizable coil unit per rotor pole, and the rotor has an interconnecting unit configured to interconnect the first and second coil units per coil in a manner which is dependent on an operating point of the electric drive machine in order to set the number of windings of the coil, and in order to electrically connect the coils of the rotor poles for configuring a rotor winding with an overall number of windings which is dependent on the numbers of windings of the coils.

2. The rotor according to claim 1, wherein the first and second coil units of a coil are arranged so as to lie radially next to one another on a pole shank of the rotor core.

3. The rotor according to claim 1, wherein the coil units in each case have a feed line and a return line which are connected to the interconnecting device, and of which, in a manner dependent on an interconnection state, provided by the interconnecting device, of the coil units, one of the feed lines configures an input connector and one of the return lines configures an output connector of the respective coil.

4. The rotor according to claim 3, wherein the interconnecting device comprises switching units which are designed, in order to interconnect the first and second coil units per coil, to connect the feed line of the one coil unit of the coil to the return line of the other coil unit of the same coil, the respective other feed line configuring the input connector of the coil, and the respective other return line configuring the output connector of the coil.

5. The rotor according to claim 4, wherein the interconnecting device comprises second switching units which are designed, in order to interconnect the coils, to electrically connect all apart from one output connector and all apart from one input connector to the rotor winding, the unconnected input connector and the unconnected output connector configuring an overall input connector and an overall output connector of the rotor winding.

6. The rotor according to claim 5, wherein the rotor comprises a contact ring module which, in order to energize the rotor winding, is electrically connected to the overall input connector and the overall output connector, and/or is connected to control lines of the switching units in order to actuate the switching units.

7. The rotor according to claim 4, wherein the switching units in each case have at least one electronic switch.

8. The rotor according to claim 1, wherein the first and second coil units are configured as shaped rod coil units.

9. The rotor according to claim 8, wherein the shaped rod coil units comprise, per rotor pole: in each case, two packs with longitudinal shaped rods which are arranged in pole gaps in order to configure axial coil conductor portions of the coil units, and in each case, two packs with transverse shaped rods which are arranged on the axially opposite end sides of the rotor core in order to configure end-side coil conductor portions, and are connected to the longitudinal shaped rods.

10. The rotor according to claim 3, wherein the first and second coil units are configured as shaped rod coil units.

11. The rotor according to claim 10, wherein the interconnecting device has a housing which is connected to a rotor shaft of the rotor, in which housing switching units of the interconnecting device for interconnecting the coil units and the coils are arranged, and has, further, four connector shaped rods per coil, which connector shaped rods are arranged in regions within the housing and in regions outside the housing and, in order to configure the feed lines and the return lines, are connected to respective coil starts and coil ends of the shaped rod coil units.

12. The rotor according to claim 1, wherein the first and second coil units are configured as wound wire coil units.

13. An electrically excited drive machine, comprising: a stator; and a rotor according to claim 1, wherein the rotor is mounted rotatably with regard to the stator.

14. A motor vehicle comprising at least one electrically excited drive machine according to claim 13.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a diagrammatic perspective illustration of a rotor of an electric drive machine;

[0025] FIG. 2 is a diagrammatic perspective illustration of a detail of the rotor; and

[0026] FIG. 3 is a diagrammatic perspective illustration of an enlarged detail of the rotor.

[0027] In the figures, identical and functionally identical elements are provided with the same reference numerals.

DETAILED DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 shows a rotor 1 for an electrically excited drive machine of an electrified motor vehicle. The rotor 1 has a rotor core 2 which can be formed as a laminated core consisting of axially stacked electric laminations. Moreover, the rotor 1 has a rotor shaft 3 which is connected fixedly to the rotor core 2 for conjoint rotation, for the transmission of torque. Here, the rotor core 2 has a solid pole geometry which is formed by a closed outer side 4, gapless in the circumferential direction, of the rotor core 2 and therefore of the entire rotor 1. This closed outer side 4 minimizes the air friction losses and increases the mechanical stability of the rotor 1.

[0029] Here, the rotor core 2 has six rotor poles 5 which in each case have a pole shank 6, as can be seen in FIG. 2. Here, the respective pole shanks 6 are of salient pole-shaped configuration and extend through a pole center of the respective rotor pole 5. Pole shoe-shaped regions 7 of the salient pole-shaped pole shanks 6 are connected here via connecting webs 8 which are configured in one piece with the regions 7, with the result that the closed, gapless outer side 4 is configured. Pole gaps are configured adjacently to opposite flanks (along the circumferential direction) of the pole shanks 6, which pole gaps extend in the direction of pole edges of the rotor poles 5. Here, the pole gaps are delimited in the direction of the pole edges by supporting web arrangements 9, in each case one supporting web arrangement 9 being arranged between the pole gaps of two adjacent rotor poles 5. Here, the supporting web arrangements 9 are of V-shaped configuration, with the result that respective cavities 10 which reduce weight and flux leakage are configured in the rotor core 2 between the supporting web arrangements 9 and the connecting webs 8.

[0030] The pole shanks 6 in each case hold a winding 11 which has two coil units 11a, 11b here. The coils 11 are interconnected to form a rotor winding 12. Here, the coil units 11a, 11b of a rotor pole 5 can 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 winding 12 therefore has only the interconnected first coil units 11a or the interconnection consisting of first and second coil units 11a, 11b. As a result of the possibility of it being possible for the second coil units 11b to be connected in, the rotor winding 12 has an adjustable number of windings which in turn influences loss of the electric drive machine. For operating point-dependent interconnecting of the coil units 11a, 11b and for connecting the windings 11 to the rotor winding 12, the rotor 1 has an interconnecting device 13. The interconnecting device 13 is connected to the rotor shaft 3 here.

[0031] FIG. 3 shows the two coil units 11a, 11b of a rotor pole 5 in an enlarged illustration. The coil units 11a, 11b are configured as shaped rod coil units with longitudinal shaped rods 14a, 14b and transverse shaped rods 15a, 15b. Here, the longitudinal shaped rods 14a which correspond to the first winding unit 11a are plugged axially into first pole gaps 16a, and the longitudinal shaped rods 14b which correspond to the second winding unit 11b are plugged axially here into second pole gaps 16b. The first longitudinal shaped rods 14a are connected via first transverse shaped rods 15a, and the second longitudinal shaped rods 14b are connected via second transverse shaped rods 15b. The longitudinal shaped rods 14a, 14b and the transverse shaped rods 15a, 15b are welded, in particular.

[0032] Moreover, the coil units 11a, 11b have feed lines 17a, 17b and return lines 18a, 18b which are configured here by connector shaped rods 19. In the case of non-interconnected coil units 11a, 11b, the respective first feed lines 17a and the first return lines 18a and, in the case of interconnected coil units 11a, 11b, the respective first feed lines 17a and the second return lines 18b form input connectors and output connectors of the respective windings 11. One of the input connectors forms an overall input connector 20 of the rotor winding 12, and one of the output connectors forms an overall output connector 21 of the rotor winding 12. The overall input connector 20 and the overall output connector 21 are connected to a contact ring 22 of a contact ring module of the rotor 1, which contact ring 22 is connected to the rotor shaft 3.

[0033] The connector shaped rods 19 are integrated into the interconnecting device 13, where they are electrically connected to switching units (not shown here) of the interconnecting device 13. Here, the interconnecting device 13 has a housing 23, in which the connector shaped rods 19 are arranged in regions. In the case of the arranging of the annular disk-shaped housing 23 on the rotor shaft 23, the connector shaped rods are arranged on the respective longitudinal shaped rods 14a, 14b, 15a, 15 which configure a winding start and a winding end of the respective winding 11a, 11b, and are connected to them, for example welded. Moreover, winding heads of the rotor winding 12 which are formed by the transverse shaped rods 15a, 15b are encapsulated by a supporting ring 24 in order to absorb centrifugal forces.

[0034] 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.