Electric Machine for a Motor Vehicle, Use of Such an Electric Machine, and Motor Vehicle

Abstract

An electric machine for a motor vehicle includes at least one winding which has at least one partial region embedded into a casting material. The casting material is a mixture including at least one cycloaliphatic epoxide resin and at least one anhydride.

Claims

1-8. (canceled)

9. An electric machine for a motor vehicle, the electric machine comprising: a winding which has a subregion embedded in a potting material, wherein the potting material is a composite which includes a cycloalipathic epoxy resin and an anhydride.

10. The electric machine as claimed in claim 9, wherein the composite also includes at least one mineral filler.

11. The electric machine as claimed in claim 9, wherein the cycloalipathic epoxy resin is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.

12. The electric machine as claimed in claim 9, wherein the anhydride is methyl-5-norbomene-2,3-dicarboxylic anhydride.

13. The electric machine as claimed in claim 9, wherein the subregion has a winding head of the winding, and the winding head protrudes from a carrier carrying the winding.

14. The electric machine as claimed in claim 13, further comprising: a stator and a rotor which can be driven by the stator and consequently is rotatable about an axis of rotation relative to the stator, wherein the winding is a constituent of the rotor.

15. A drive train of the motor vehicle, the drive train comprising the electric machine as claimed in claim 9, wherein the drive train is configured to drive the motor vehicle electrically by way of the electric machine.

16. A motor vehicle comprising: an electric machine by way of which the motor vehicle is drivable, wherein: the electric machine has a winding which has a subregion embedded in the potting material, and the potting material is a composite which includes a cycloalipathic epoxy resin and an anhydride.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0020] The single the FIGURE here shows a schematic side view in section of an electric machine according to embodiments of the invention for a motor vehicle.

DETAILED DESCRIPTION OF THE DRAWING

[0021] The single the FIGURE here shows a schematic side view in section of an electric machine 1 for a motor vehicle. This means that the motor vehicle which preferably takes the form of a car, in particular a passenger car, includes the electric machine 1 in its completed state. The electric machine 1 is here a constituent of a drive train of the motor vehicle which can be driven by way of the drive train. The motor vehicle can here be driven (in particular purely) electrically by way of the electric machine 1 such that the electric machine 1 is a traction machine or is also referred to as a traction machine.

[0022] The motor vehicle moreover comprises an electrical energy store in or by way of which electrical energy or electrical current can be stored. In particular, the energy store can be designed as a battery, in particular as a high-voltage (HV) battery. It is thus preferably provided that the electrical machine 1 and the energy store are designed as high-voltage components, the respective electrical voltage, in particular operating of nominal voltage, of which is at least 48 volts and preferably is greater than 50 volts, in particular greater than 60 volts. Particularly high electrical power for electrically driving the motor vehicle can be achieved as a result.

[0023] In order to drive the motor vehicle electrically by way of the electric machine 1, the electric machine 1 is operated in motor mode and hence as an electric motor. For this purpose, the electric machine is supplied with the electrical energy stored in the energy store. The electric machine 1 can be operated, for example, also in generator mode and also as a generator. In generator mode, the electric machine 1 is driven, for example, by wheels of the rolling motor vehicle and hence by way of kinetic energy of the motor vehicle. The generator converts the kinetic energy into electrical energy which is supplied by the generator and can be stored, for example, in the energy store.

[0024] The electric machine 1 has a housing 2 and a stator 3 which is fixed, for example, on the housing 2. The electric machine 1 moreover comprises a rotor 4 which can be driven by the stator 3 and consequently can rotate about an axis of rotation 5 relative to the stator 3 and relative to the housing 2. The rotor 4 comprises a rotor shaft 6 via which the electric machine 1 can supply at least one torque in order to drive the motor vehicle (in particular purely) electrically. The rotor 4 is mounted on the housing 2 so that it can rotate in particular via the rotor shaft 6 by way of bearings 7. The respective bearing 7 is here designed, for example, as a rolling bearing.

[0025] The rotor 4 comprises a carrier 8, also referred to as a carrier element, which is designed, for example, separately from the rotor shaft 6 and is arranged on the rotor shaft 6. In particular, the carrier 8 is connected non-rotatably to the rotor shaft 6. The carrier 8 takes the form, for example, of a laminated core. The electric machine 1 furthermore comprises at least one winding 9, illustrated particularly schematically in the FIGURE and a portion of which is visible, which is designed as a constituent of the rotor and hence as a rotor winding in the exemplary embodiment shown in the FIGURE. The winding 9 is formed by at least one electrical conductor which is designed separately from the carrier 8 and is held on the carrier 8 and hence carried by the carrier 8. This means that the carrier 8 carries the winding 9. In particular, the conductor is wound around at least a part of the carrier 8, forming the winding 9.

[0026] It can be seen from the FIGURE that the winding 9 has winding heads 10 arranged on sides S1 and S2 of the carrier 8 which are averted from each other in the axial direction of the rotor 4. It can also be seen from the FIGURE that at least respective subregions T of the winding 9 are embedded in a potting material 11. The subregions T here comprise the winding heads 10 such that at least the winding heads 10 are embedded in the potting material 11.

[0027] In the course of a method for producing the electric machine 1, the respective subregion T and hence the respective winding head 10 are provided with the initially liquid potting material 11, after which the initially liquid potting material 11 is cured. As a result, the respective subregion T and hence the respective winding head 10 are embedded in the potting material 11 such that, in particular in the fully produced state of the electric machine 1, the winding heads 10 are embedded in the potting material 11 which has then been cured and hence has a solid form. For example, in the course of the method, the potting material 11 is introduced in liquid form or in a liquid state, in particular by way of potting, into the electrical machine 1, in particular into the rotor 4, after which the initially liquid potting material 11 is cured and as a result of which the winding heads 10 are embedded in the potting material 11. In particular, the liquid potting material 11 is introduced into the electric machine 1, in particular into the rotor 4, by adjusting the vacuum pressure.

[0028] In order to be able now to achieve particularly high performance of the electric machine 1 and hence particularly advantageous operation, the potting material 11 is a composite or a mixture which includes at least one cycloalipathic epoxy resin and at least one anhydride and preferably also a mineral filler. The potting material 11 thus takes the form of a mineral-filled epoxy resin system or a mineral-filled formulation which includes the at least one cycloalipathic epoxy resin and the at least one anhydride. A particularly high glass transition temperature of the potting material 11 can be achieved as a result such that the electric machine 1 also can withstand particularly high temperatures without being damaged. Particularly high-performance and efficient operation of the electric machine 1 can be ensured as a result.

TABLE-US-00001 List of reference symbols 1 electric machine 2 housing 3 stator 4 rotor 5 axis of rotation 6 rotor shaft 7 bearing 8 carrier 9 winding 10 winding head 11 potting material S1, S2 end side T subregion