Rotor shaft section, locking device, motor power unit and vehicle

Abstract

The invention relates to a rotor shaft section (2) of an electric motor power unit, in particular of a separately excited synchronous electric machine for driving an electric motor power unit of a vehicle. The rotor shaft section (2) is partially made of plastic, in which metal contacts for externally exciting the synchronous machine are embedded. The contact comprises at least two slip rings (12, 14) for contacting the respective brushes (20, 22) and at least one conductor track (16, 18) associated with the respective slip ring (12, 14), which conductor track passes through the plastics of the rotor shaft section (2) from the respective slip ring (12, 14). According to the invention, one slip ring (14) of the at least two slip rings is also formed with an end-side metal section (24) having a metal discontinuity (U) in the circumferential direction of the rotor shaft section (2), the end-side metal section (24) being designed to interact with a corresponding signal generator (26) in order to detect the position of the synchronous machine rotor. A locking device, an electric motor power unit and a vehicle are also presented.

Description

Technical Field

[0001] The present invention relates to a rotor shaft section of a separately excited synchronous motor of an electric motor power unit, in particular for driving a vehicle, a locking device having such a rotor shaft section for a drive train, in particular for driving a vehicle, a electric motor power unit having such a rotor shaft section or such a locking device, in particular for driving a vehicle, and a vehicle having such an electric motor power unit, in particular for driving a vehicle. Summary of the Invention

[0002] The object underlying the present invention is to improve an electric motor drive unit, in particular an electric motor drive unit for driving a vehicle.

[0003] This object is achieved by the rotor shaft segment as set forth and claimed in claim 1 .

[0004] The present invention provides a rotor shaft section of a separately excited synchronous motor of an electric motor power unit, in particular of an electric motor power unit for driving a vehicle.

[0005] The rotor shaft section is composed in sections of plastic, into which metal contacts are embedded for external excitation of the synchronous machine.

[0006] The contact element comprises at least two slip rings for contacting corresponding brushes, and at least one conductor line associated with the respective slip ring, which conductor lines extend from the respective slip ring through the plastic of the rotor shaft section.

[0007] At least one of the two slip rings is further formed with a metal section on the end side, which has a metal discontinuity in the circumferential direction of the rotor shaft section, and the metal section on the end side is designed to cooperate with a corresponding signal generator for detecting the position of the rotor of the synchronous motor, which is arranged on the rotor shaft.

[0008] The proposed slip ring enables both external excitation of the synchronous motor and rotor position detection, fulfilling both functions. Consequently, the proposed rotor shaft section contributes to component savings. This in turn saves weight, installation space, and costs. Furthermore, it simplifies rotor shaft assembly.

[0009] Here, it is proposed to design the slip ring together with the metal section at the end side as a cup-shaped element. Here, the slip ring can be manufactured as a metal deep-drawn part.

[0010] In one embodiment, the plastic of the rotor shaft section is cohesively connected to a form-locking element for connection to the rotor shaft of a synchronous machine. This expands the functional scope of the proposed rotor shaft section to include the on-demand locking or blocking function of the rotor shaft and, therefore, of the drive train, in particular, of a drive vehicle. This is because the form-locking element is part of a locking mechanism for on-demand locking of the rotor shaft.

[0011] The present invention also proposes a locking device for a drive train, in particular a drive train of a drive vehicle, wherein the locking device comprises a rotor shaft segment of the aforementioned type, wherein the rotor shaft segment comprises such a form-locking element.

[0012] The invention furthermore proposes an electric motor power unit, in particular an electric motor power unit for driving a vehicle, which has a separately excited synchronous motor having a rotor shaft segment or a locking device of the above-mentioned type.

[0013] The invention also provides a vehicle having such an electric motor power unit, in particular an electric motor power unit for driving a vehicle.

[0014] In this context, a "vehicle" is to be understood as any type of vehicle or motor vehicle, in particular an electric motor-driven vehicle or motor vehicle, but in particular a passenger car and / or commercial vehicle in the form of an electric vehicle or a hybrid vehicle. In this context, the vehicle is preferably a partially autonomous, in particular fully autonomous vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in detail below with reference to the accompanying drawings. Further advantageous improvements of the present invention can be found in the dependent claims and the following description of preferred embodiments.

[0016] Figure 1 shows a sectional view of a first rotor shaft section,

[0017] Figure 2 Shown is a perspective view of the second rotor shaft section. DETAILED DESCRIPTION

[0018] according to Figure 1 The rotor shaft section 2 is part of the rotor shaft of a separately excited synchronous motor, in particular for driving a vehicle, and comprises a metallic shaft end 4 on which plastic or a plastic section 6 is applied or injection-molded. Embedded in this plastic section 6 are metallic contacts in the form of two slip rings 12, 14, as well as conductors 16, 18 associated with each slip ring 12, 14, which extend from the respective slip ring 12, 14 through the plastic section 6 in the direction of an externally excited rotor (not shown here) arranged on the rotor shaft.

[0019] Injection-molded or injection-molded plastic forms a plastic insulation structure for preventing short circuits between the slip rings 12, 14 and to the right of the slip ring 12. This plastic insulation structure, with its respective spaced-apart, circumferentially molded, radially protruding plastic barriers, provides sufficient insulation in the form of air gaps and creepage distances.

[0020] Figure 1 Also shown are two metal brushes 20 , 22 for the external excitation of the synchronous machine, the brushes being in contact with the corresponding slip rings 12 , 14 .

[0021] The slip ring 14 is formed in a cup-like manner, for example as a so-called deep-drawn part, wherein the cup bottom forms an end section 24 of one end of the rotor shaft section 2 in order to be able to cooperate with an inductive signal transmitter, for example a circuit board 26 .

[0022] Figure 2 Here, the embodiment of the metal section 24 and its interruption U in the circumferential direction of the slide ring 14 is shown, which interruption itself can be filled with injected plastic. Between two adjacent interruptions U or gaps, there is a metal bridge-like section 25 .

[0023] Therefore, according to Figure 1 The rotor shaft section 2 realizes two functions. That is, on the one hand, it is used for external excitation of the rotor of the rotor shaft, and on the other hand, it is used for position detection of the rotor of the external excitation. The slip ring 14 combines the two functions in one component or realizes two functions. On the one hand, the slip ring cooperates with the brush 20 as a contact element, and on the other hand, the slip ring cooperates with the signal generator as an encoder wheel. When cooperating with the signal generator, a periodic or sine-cosine form voltage signal is generated, from which the absolute angular posture or angular position of the rotor of the synchronous motor relative to the stator can be determined in the control unit, so that the synchronous motor can be commutated efficiently. Therefore, according to Figure 1 The rotor shaft segment 2 is a so-called “two-in-one” module (ie two functions are implemented in one module or rotor shaft segment 2 ).

[0024] exist Figure 2 In this embodiment, the rotor shaft segment 2 is also designed in the form of a shaft adapter, which can be connected to the rotor shaft in a form-fitting manner. The plastic of the rotor shaft segment 2 can be integrally bonded or integrally molded with a high-strength metal form-fitting element 28 with an external toothing. This form-fitting element 28 is part of the locking mechanism for locking the rotor shaft. It also functions as a metal adapter ring, which can be pressed onto the correspondingly complementary outer contour or outer toothing of the rotor shaft via an inner contour or inner toothing (not shown here).

[0025] and Figure 1 Different, according to Figure 2The rotor shaft section 2 realizes another function, namely the third function, namely the function of locking or blocking the rotor shaft as required. Figure 2 The rotor shaft section 2 is a so-called “three-in-one” module (ie, three functions are implemented in one module or rotor shaft section 2 ).

[0026] Similar to Figure 2 ,according to Figure 1 The rotor shaft section 2 can also be designed as a shaft adapter, even if Figure 1 The rotor shaft section 2 does not have the form-locking element. In this case, the rotor shaft section 2 can be connected or joined to the rotor shaft, for example, in a form-locking manner, and at the same time be pressed, for example.

[0027] The subject matter presented in the present disclosure is based on the disclosure content of German patent applications No. 10 2022 207 254.5, 10 2022 207 258.8 and 10 2022 207 255.3. These applications are expressly referenced herewith.

[0028] In German patent application No. 10 2022 207 254.5, a parking lock concept or locking device concept is disclosed, in which a separately arranged contact piece is accommodated by the housing of the parking lock or locking device, and the contact piece has at least two brushes for externally exciting the rotor of a synchronous motor of an electric power unit connected to the shaft.

[0029] German patent application number 10 2022 207 258.8 discloses a parking lock or locking device concept with a position sensor arrangement. According to this concept, a circuit board with an inductive signal transmitter and a sensor component that cooperates with the signal transmitter and is at least partially metallic are accommodated by the housing of the parking lock or locking device. The position sensor arrangement detects the absolute angular position or angular attitude of a rotor connected to a shaft of a motor-driven unit, in particular an electric motor of the motor-driven unit for driving a vehicle.

[0030] In German patent application No. 10 2022 207 255.3, a multifunctional shaft adapter for a locking device is proposed, which is provided for mounting on an electric motor power unit, in particular an electric motor power unit for driving a vehicle.

[0031] The shaft adapter can be connected to a lockable shaft of the motor power unit and is essentially composed of plastic, in which contacts for external excitation of a rotor of a synchronous motor of the motor power unit, which is connected to the shaft, are embedded. The shaft adapter is also materially connected to a form-fitting element for connection to the shaft.

[0032] Hereby, the contents of these three applications at least related to various aspects of the present invention are incorporated into the disclosure of this specification.

[0033] While exemplary embodiments have been described above, it should be noted that numerous variations exist. It should also be noted that these exemplary embodiments are merely illustrative and are in no way intended to limit the scope of protection, applications, or configurations. Rather, the foregoing description provides guidance to those skilled in the art regarding the implementation of at least one exemplary embodiment, and in this context, various modifications may be made to the functionality and arrangement of the described components without departing from the scope of protection defined by the claims and their equivalent combinations of features.

Claims

1. A rotor shaft section (2) of a separately excited synchronous motor of an electric motor power unit, in particular of an electric motor power unit for driving a vehicle, in, The rotor shaft section (2) is partially made of plastic, into which metal contacts for external excitation of the synchronous machine are embedded. The contact element comprises at least two slip rings (12, 14) for contacting corresponding brushes (20, 22) and at least one conductor line (16, 18) assigned to the corresponding slip ring (12, 14), wherein the conductor line passes from the corresponding slip ring (12, 14) through the plastic of the rotor shaft section (2). One of the at least two slip rings (14) is further formed with a metal section (24) on the end side, which has a metal discontinuity (U) in the circumferential direction of the rotor shaft section (2), and the metal section (24) on the end side is designed to cooperate with a corresponding signal generator (26) for detecting the rotor position of the synchronous motor.

2. The rotor shaft segment (2) according to claim 1, wherein: The slip ring (14) is designed together with the end-side metal section (24) as a cup-shaped component.

3. The rotor shaft segment (2) according to claim 2, wherein: The slip ring (14) is manufactured as a deep-drawn metal part.

4. The rotor shaft segment (2) according to any one of the preceding claims, wherein: The plastic of the rotor shaft section (2) is connected in a materially bonded manner to a form-fitting element (28) for connection to the rotor shaft of the synchronous machine.

5. A locking device for a drive train, in particular a drive train of a vehicle, wherein: The locking device comprises a rotor shaft segment according to any one of the preceding claims 1 to 3, wherein the plastic of the rotor shaft segment (2) is materially connected to a form-fitting element (28) for connection to a rotor shaft of a synchronous machine. 6 . An electric motor power unit, in particular for driving a vehicle, comprising a separately excited synchronous motor having a rotor shaft segment according to claim 1 or a locking device according to claim 5 .

7. A vehicle having the motor power unit according to claim 6.

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