ELECTRO DRIVE SYSTEM

Abstract

The invention relates to an electric drive, in particular for a vehicle, comprising an electric motor (1) and a power supply (6), the power supply (6) being on the radial outer surface of the electric motor (1), and around the electric motor (1) angularly, in particular over an angle of 360.

Claims

1. An electric drive comprising: an electric motor; and a power supply provided on the radial outside of the electric motor and extends angularly around the electric motor.

2. The electric drive according to claim 1, wherein the power supply has a tubular and cylindrical housing and the electric motor is mounted inside the housing.

3. The electric drive according to claim 2, wherein the tubular and cylindrical housing has a plurality of cylindrical chambers in which energy-storing cells are held or can be held.

4. The electric drive according to claim 2, wherein the tubular and cylindrical housing is divided axially into a plurality of rings whose axial lengths are each adapted to accommodate only one of the energy-storing cells extending axially in a respective one of the cylindrical chambers.

5. The electric drive according to claim 2, wherein each ring is divided angularly into at least two segments.

6. The electric drive according to claim 5, further comprising: an interconnection plate shaped as a circular ring segment is mounted between the segments of adjacent rings positioned axially one after the other.

7. The electric drive according to claim 6, wherein the energy-storing cells of at least a portion of the segments mounted axially one after the other at the same angular position are electrically connected in series by the interconnection plates.

8. The electric drive according to claim 6, further comprising: an other plate is mounted in an area between angularly adjacent segments for all segments positioned axially one after the other at the same angular position, the other plates each extending axially parallel thereto and substantially over an entire axial length of the tubular and cylindrical housing of the power supply with each other plate electrically connected to each interconnection plate between two adjacent segments positioned axially one after the other.

9. The electric drive according to claim 8, wherein the other plate comprises an electronic circuit for energy-storage-cell management for verifying cell voltages connected in series in each segment or in all segments with the same angular position.

10. The electric drive according to claim 1, further comprising: at least one control plate mounted at least partially overlapping the axial end faces of the power supply and the electric motor, and configured to distribute the energy of the power supply unit to a stator-energizing system of the electric motor.

11. The electric drive according to claim 10, wherein each one of the segments of the tubular and cylindrical housing of the power supply extending angularly, or all segments of rings positioned axially one after the other at the same angular position have a respective one of the control plates that are functionally assigned to them, in the shape of a circular ring segment, and connected to a part of a stator-energizing system that extends over the same angular range as the respective segment.

12. The electric drive according to claim 10, wherein each control plate forms power electronics, and all of the control plates that are functionally assigned to each of the segments form respective power electronics, and each voltage, series-connected voltages of the segments positioned axially one after the other at the same angular position, are electrically connected to the power electronics such that the electric motor can be operated by the energy and power electronics of the segments of a single angular position.

13. The electric drive according to claim 10, wherein the stator-energizing system is formed by a plurality of energizable rods that extend axially through the stator of the electric motor and that are each connected by one end to a shared short-circuit ring and at an other end to a respective control plate.

14. The electric drive according to claim 12, wherein the stator-energizing system has a plurality of energizing windings or rods that are functionally coupled to a number of more than 3 phases such that the voltage difference between two phases or one phase and ground is less than or equal to 60 volts.

15. The electric drive according to claim 5, wherein each segment of the tubular and cylindrical housing of the power supply, can be plugged or pushed axially onto the outer surface of the electric motor by radial ridges that engage at least with ends of axial guide grooves by sliding thereover.

16. The electric drive according to claim 15, wherein the power supply and the electric motor are thermally insulated from each other by a radial spacing through which the housing of the power supply and the electric motor are connected only by the ridges.

17. The electric drive according to claim 15, wherein the electric motor and the power supply each have their own heat-dissipation systems that are independent of each other and that are formed by heat pipes that extend axially through the electric motor and/or the power supply.

18. The electric drive according to claim 10, wherein at least one groove extends to the inner surface of a stator in a lamination of the electric motor the drive further comprising: a magnetic field sensor mounted in the groove and projecting from the power electronics of a control plate and projects into the groove.

19. The electric drive according to claim 1 wherein the electric motor has a shaft and the drive further comprises: at least one permanent magnet for detecting the rotation angle on the shaft of the electric motor, with a magnetic field; and a rotational angle sensor mounted on an overlying plate for detecting the field.

20. The electric drive defined in claim 1, wherein the power supply and motor are both substantially centered on a common axis and the power supply extends over 360 around the motor.

Description

[0068] A preferred embodiment will be described with reference to the following figures:

[0069] FIG. 1 shows an electric drive according to the invention, having an electric motor 1 with an output shaft 2, and rods 3 projecting oppositely from the stator for energizing the stator. The rods can preferably be connected, individually or in groups, to one or more phases, in particular with a phase voltage of less than 60V each.

[0070] The outer surface of the electric motor 1 in this embodiment has grooves 4, here with a dovetail cross section, into which complementary ridges 5 on the inner surface of the power supply 6 (shown here only in part) can fit.

[0071] The power supply 6 is housed in a tubular and cylindrical housing here divided case both axially and angularly. As a result, the entire tubular and cylindrical housing is formed in a plurality of ring segments 7, of which here only those lying axially one behind the another at one angular position are shown. This angular position extends over an angle of 90, since there is an angular division into 4 segments.

[0072] In this case, standardized battery cells will be used in cylindrical chambers 8 to form the power supply of the motor.

[0073] Heat pipes can be fitted in the grooves 9 in order to transfer the heat generated in power electronics (not shown here) and the heat of the motor 1 to the end face at the output shaft 2 end.

[0074] Also, the ring segments 7 can have external grooves 10 in which heat pipes enter for conducting away heat.

[0075] FIG. 2 shows a view illustrating that interconnection plates 11 (in particular, at least one) can be held between two adjacent segments 7, particularly between each pair of two adjacent segments 7 positioned axially one after the other at the same angular position, to connect the battery cells within each segment 7 and between the adjacent segments 7. For example, all the battery cells contained in the segments can be connected in series in this way. Each segment can have its own respective plate.

[0076] Each interconnection plate 11 that is designed in this case in the shape of a circular ring segment, has, on an angularly directed end edge 11a, contacts 12 that can be connected to a plate (not shown) that can be positioned in the space 13 that extends axially and is on an angularly directed end 7a of each segment, and thus is also between two segments that are angularly directly adjacent each other. The plate, not shown here, can manage the battery cells.

[0077] FIG. 3 shows the arrangement of a control plate 1 that extends at least substantially over the same angle as the segment 7, and therefore has the shape of a circular ring segment. The control plate 14 shown here carried a power circuit for controlling the rods 3 of the stator that contact the plate 14 in the same angular range by insertion into same.

[0078] The control plate covers a part of the end face of the motor 3, and substantially completely covers the end face of the last and/or first segment 7.

[0079] The overall arrangement shown here, comprising all segments 7 positioned axially one after the other at this angular position, with the battery cells and plates contained therein, forms a module together with the respective control plate 14 that enables operation of the electric motor by itself.

[0080] This also demonstrates that of the inventive power supply unit need not necessarily extend angularly over the complete 360.

[0081] In this example, three further identical such modules (not shown) can be mounted on the motor 1, thus substantially quadrupling the total electric capacity as well as the torque of the motor. These modules, accordingly numbering four, form a power supply in the context of the invention that extends angularly over the complete 360, in particular also forming a quadruple redundancy in this case.

[0082] The invention is not limited to the 4-part segmentation shown here. More or fewer segments can also be employed.