Separately excited electric synchronous machine

Abstract

The present invention relates to a separately excited electric synchronous machine (100) with a synchronous machine rotor (101), the separately excited electric synchronous machine having a synchronous machine rotor coil (103), the separately excited electric synchronous machine comprising a synchronous machine stator (104) and the synchronous machine rotor (101) rotating relative to the synchronous machine stator (104) around a rotation axis (90) during operation. The signal transmission device (20) provides improved operational stability and improved operational variability with a simple implementation of having a signal coil (21) in the rotor (101) connected in series with the synchronous machine rotor coil (103) and having a magnetic field sensor (23) in the synchronous machine stator (104) for detecting the magnetic field generated by the signal coil (21) during operation. The present invention also relates to a motor vehicle (200) equipped with such a separately excited electric synchronous machine (100).

Description

[Technical field]

[0001] The present invention relates to a separately excited electric synchronous machine having a synchronous machine rotor coil, which is supplied with a DC voltage during operation and which generates a rotor magnetic field.

[0002] A separately excited electric synchronous machine comprises a fixed stator and a rotor which rotates relative to the stator around an axis of rotation during operation, and which are hereinafter also called synchronous machine stator and synchronous machine rotor. The rotor magnetic field of the synchronous machine rotor and the stator magnetic field of the synchronous machine stator act together. In a separately excited electric synchronous machine, the rotor magnetic field of the synchronous machine rotor, which is required, is separately excited. For this purpose, the synchronous machine rotor generally has a rotor coil which is supplied with a DC voltage to generate the magnetic field. The supply of the DC voltage to the rotor coil is usually generated by induction.

[0003] Such a synchronous machine is known, for example, from EP 2 869 316 B1.

[0004] Typically, the fixed stator and the rotor that rotates during operation are matched to each other so that the desired operation of the synchronous machine is achieved. Any change in that match can result in deviations from the desired operation. Therefore, desired changes during operation can be difficult to achieve or can even be impossible to achieve. Summary of the Invention

[0005] The present invention therefore relates to the problem of indicating improved or at least alternative embodiments for a separately excited electric synchronous machine of the kind described in the introduction, and for a motor vehicle comprising such a synchronous machine, which overcomes the drawbacks known from the prior art. In particular, the present invention relates to the problem of indicating embodiments of a separately excited electric synchronous machine and for a motor vehicle, which are characterized by a simple implementation improved operating stability and / or a simple implementation improved operating variability.

[0006] According to the invention, this object is solved by the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims.

[0007] The invention is therefore based on the idea that the current flowing through the rotor coils of the rotor of a separately excited electric synchronous machine is picked up by a signal coil connected in series therewith, which generates a magnetic field that is detected by a fixed sensor. It is thus possible in a simple and efficient manner to transmit an operating signal corresponding to the current flowing through the rotor coils from the rotating rotor to the fixed sensor during operation and without contact. As a result, changes in the operating parameters of the synchronous machine, in particular changes in the current flowing through the rotor coils, can be taken into account in a simple and efficient manner. This increases the stability of the operation of the synchronous machine. In addition, changes during operation of the synchronous machine can be easily realized in this way. This increases the variability of the operation of the synchronous machine.

[0008] According to the invention, a separately excited electric synchronous machine, also referred to in the following simply as a synchronous machine, comprises a rotor and a stator. In the following, the rotor is also referred to as the synchronous machine rotor and the stator is also referred to as the synchronous machine stator. The synchronous machine rotor comprises a rotor shaft on which a rotor coil is non-rotatably arranged. In the following, the rotor coil is also referred to as the synchronous machine rotor coil. The synchronous machine rotor coil generates a magnetic field during operation, said magnetic field being also referred to in the following as the rotor magnetic field. For this purpose, the synchronous machine rotor coil is supplied with a direct current voltage during operation, so that a current, for example a load current, flows through the synchronous machine rotor coil. The synchronous machine stator comprises a coil fixed to the synchronous machine stator, said coil being also referred to in the following as the synchronous machine stator coil. The synchronous machine stator coil generates a magnetic field during operation, said magnetic field being also referred to in the following as the stator magnetic field. In operation, the rotor magnetic field and the stator magnetic field interact with each other such that the synchronous machine rotor rotates around an axial axis of rotation. The synchronous machine further comprises a signal transmission device for contactlessly transmitting an operating signal corresponding to the DC voltage, and therefore the load current, to the synchronous machine stator. The signal transmission device comprises a signal coil connected in series with the synchronous machine rotor coil in the synchronous machine rotor, and a magnetic field sensor in the synchronous machine stator. The magnetic field sensor detects the magnetic field generated by the signal coil during operation.

[0009] During operation, a load current flows through the signal coil, which is connected in series with the synchronous machine rotor coil. The signal coil thus generates a magnetic field, hereinafter also called the signal magnetic field. The strength of the signal magnetic field depends on the load current. In particular, the strength of the signal magnetic field is proportional to the load current. The signal magnetic field detected by the magnetic field sensor thus depends on the load current, which results in a contactless transmission of the signal magnetic field, reflecting the load current as an operating signal, from the rotating synchronous machine rotor during operation to the fixed synchronous machine stator by means of the signal transmission device.

[0010] Basically, the magnetic field stator can be configured as required, provided that it detects a signal magnetic field during operation.

[0011] During operation, the magnetic field sensor generates a sensor signal which is dependent on the detected signal magnetic field in effect.

[0012] In a preferred embodiment, the magnetic field sensor is configured such that the sensor signal is proportional to the detected magnetic signal field, and thus the sensor signal is proportional overall to the load current, which allows the load current to be determined simply and reliably.

[0013] In a preferred embodiment, the magnetic field sensor comprises a Hall effect sensor, also known as a Hall sensor, and is preferably configured as a Hall effect sensor, which in addition to being simple to configure, outputs a sensor signal that is highly dependent on the signal magnetic field, in particular a sensor signal that is proportional to the signal magnetic field.

[0014] The directions indicated herein refer to the axis of rotation extending axially. Thus, "axial" is parallel to, e.g., coaxial with, the axis of rotation. Additionally, "radial" is transverse to, the axis of rotation. Additionally, circumferential surrounds, the axis of rotation.

[0015] In practice, the signal transmission device comprises a device fixed to the synchronous machine stator for receiving and processing the sensor signals, said device being in fact electrically connected to the magnetic field sensor. The device, also called processing device in the following, is in fact configured to determine the load current from the sensor signals.

[0016] Basically, the signal coils can be mounted on the synchronous machine rotor as required.

[0017] Preferably, the signal coil is mounted on the rotor shaft.

[0018] An embodiment in which the signal coil is arranged on the axial end face of the rotor shaft is considered to be preferred, so that undesired magnetic interactions between the signal coil and other magnetically active components of the synchronous machine are avoided or at least reduced, and furthermore this allows a compact construction of the synchronous machine.

[0019] Basically, the signal coils can be configured as desired.

[0020] Preferably, the signal coil is configured as an air-core coil, so that the influence of the signal coil on the synchronous machine rotor coil is avoided or reduced as much as possible. Since the air-core coil has no magnetic saturation, it is possible to generate a signal magnetic field in a wide range with respect to the load current, in particular in proportion to the load current. This allows reliable detection and measurement of the load current.

[0021] Basically, if the magnetic field sensor detects a signal magnetic field, the magnetic field sensor may be positioned relative to the signal coil, if desired.

[0022] It is conceivable to arrange the magnetic field sensor radially outside the signal coil.

[0023] An embodiment in which the magnetic field sensor enters the signal coil axially is considered to be preferred. The magnetic field sensor is thus surrounded circumferentially by the signal coil. Thus, the detection of the signal magnetic field is improved and / or more accurate. In particular, disturbances of the detection, such as for example noise, are thus prevented or at least reduced. The load current can thus be determined more simply and / or more accurately.

[0024] In a preferred embodiment, the signal coil is surrounded in the circumferential direction by an axially open sleeve. The signal coil is inserted in the sleeve, in particular in the axial direction. In practice, the sleeve is arranged on the side of the signal coil that is radially away from the magnetic field sensor. The sleeve serves in particular the purpose of magnetic shielding. Thus, the signal magnetic field is not or only slightly influenced by other magnetic fields and vice versa. Furthermore, the signal coil is mechanically protected in this way. Basically, the sleeve may be fixed to the synchronous machine stator.

[0025] Preferably, the sleeve is arranged non-rotatably on the synchronous machine rotor, in particular on the rotor shaft, and preferably protrudes from an end face of the rotor shaft and circumferentially surrounds the signal coil and preferably also circumferentially at least partially surrounds the magnetic field sensor.

[0026] Preferably, the synchronous machine rotor coil is inductively powered.

[0027] For this purpose, the synchronous machine preferably comprises an electric rotary transformer for inductive power transmission. This rotary transformer comprises a stator and a rotor, which are also referred to below as rotary transformer stator and rotary transformer rotor. The rotary transformer stator comprises a coil, which is also referred to below as transformer primary coil. The rotary transformer rotor comprises a coil, which is also referred to below as transformer secondary coil. The rotary transformer stator is fixed to the synchronous machine stator, which is non-rotatably attached to the synchronous rotor. Thus, during operation, the rotary transformer rotor is rotatable relative to the rotary transformer stator around its axis of rotation and rotates together with the synchronous machine rotor around its axis of rotation. During operation, the transformer primary coil and the transformer secondary coil mutually induce to induce an alternating voltage in the transformer secondary coil. This alternating voltage is also referred to below as transformer voltage. Preferably, the transformer primary coil and the transformer secondary coil are arranged to face each other in the axial direction.

[0028] In practice, a rectifier circuit is connected between the transformer secondary coil and the synchronous machine rotor coil. This rectifier circuit converts the transformer voltage induced in the transformer secondary coil during operation into a DC voltage for the synchronous machine rotor coil. The rectifier circuit is configured to function in this way.

[0029] In practice, the signal coil is separate from the transformer secondary coil.

[0030] In practice, the signal coil is preferably magnetically separated and / or shielded from the transformer secondary coil and the transformer primary coil.

[0031] Advantageously, the signal coil is spaced apart from the transformer secondary coil and also from the transformer primary coil.

[0032] Preferably, the signal coil is radially, and in particular preferably also axially, spaced apart from the transformer secondary coil and / or spaced apart from the transformer primary coil.

[0033] The synchronous machine may be powered by a power source providing a DC voltage.

[0034] In practice, a synchronous machine comprises a rectifier circuit connected upstream of the transformer primary coil, so that the AC voltage for the transformer primary coil required during operation can be generated from its power source.

[0035] Similarly, the synchronous machine may include an inverter circuit, by which the synchronous machine stator coils are supplied with an AC voltage via a power source.

[0036] Preferably, the processing device is communicatively connected to the control device and / or to the at least one inverter circuit, so that the transformer voltage can vary as a function of the load current, and so that it is likewise possible to vary the rotor magnetic field as a function of the load current.

[0037] Synchronous machines can be used in principle in any application. In particular, they are used as traction motors, for example in automobiles. Preferably, such traction motors have a power output, i.e. a driving force, of 100 kW-240 kW, in particular 140 kW.

[0038] Synchronous machines are used in particular in motor vehicles, which may be provided with a battery as a power source for operating the synchronous machine, and as they serve in particular to drive motor vehicles, they are in particular configured as separately excited electric synchronous machines.

[0039] It should be understood that in addition to separately excited electric synchronous machines, automobiles are also part of the scope of the present invention.

[0040] Further important features and advantages of the invention will become apparent from the dependent claims, the drawings and the associated drawing description by way of the drawings.

[0041] It will be understood that the features mentioned above and further described below can be used not only in the respective combinations indicated, but also in other combinations or alone, without departing from the scope of the invention.

[0042] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred exemplary embodiments of the present invention are illustrated in the drawings and will be described in more detail in the following description, where like reference numbers indicate identical, similar, or functionally identical components.

[0043] Each figure is a schematic diagram. [Brief description of the drawings]

[0044] [Figure 1] FIG. 1 is a highly simplified circuit diagram of a separately excited electric synchronous machine with a signal transmission device in a motor vehicle. [Diagram 2] FIG. 2 is a cross-sectional view of a synchronous machine in the area of ​​a signal transmission device. [Diagram 3] FIG. 3 is a cross-sectional view of a rotary transformer of a synchronous machine. [Figure 4]FIG. 4 is a perspective view, partially in section, of a separately excited electric synchronous machine. [Diagram 5] FIG. 5 is a highly simplified cross-sectional view of a separately excited electric synchronous machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0045] For example, a separately excited electric synchronous machine 100 as shown in Figures 1-5, hereinafter also referred to as a synchronous machine 100 for simplicity, may be used in a motor vehicle 200. The separately excited electric synchronous machine 100 may in particular be used as a synchronous machine 110 for driving the motor vehicle 200.

[0046] As is particularly evident from FIG. 1, the synchronous machine 100 comprises a rotor 101. In the following, the rotor 101 is also referred to as the synchronous machine rotor 101. The synchronous machine rotor 101 comprises a rotor shaft 102 and a coil 103 (see also FIG. 1) arranged non-rotatably on the rotor shaft 102 (see FIG. 2-FIG. 5). The coil 103 is also referred to as the synchronous machine rotor coil 103 in the following. In operation, the synchronous machine rotor coil 103 generates a magnetic field, which is also referred to as the rotor magnetic field in the following. Furthermore, the synchronous machine 100 comprises a stator 104, which is also referred to as the synchronous machine stator 104 in the following. In addition, the synchronous machine 100 comprises a coil 105 (see FIG. 5) fixed to the synchronous machine stator, which is also referred to as the synchronous stator coil 105 in the following. In operation, the synchronous machine stator coil 105 generates a magnetic field, which is also referred to as the stator magnetic field in the following. During operation, the stator magnetic field and the rotor magnetic field interact with each other as the synchronous machine rotor 101 rotates about the axis of rotation 90. To generate the rotor magnetic field, the synchronous machine rotor 101, specifically the synchronous machine rotor coils 103, require a DC voltage. During operation, a current flows through the synchronous machine rotor coils 103, this current is also referred to as the load current.

[0047] The directions indicated herein are relative to the axis of rotation 90. Thus, "axial" refers to extending parallel to, and specifically coaxial with, the axis of rotation. Additionally, "radial" refers to extending transversely to the axis of rotation 90. Additionally, the circumferential direction 91 extends around the axis of rotation 90.

[0048] As is clear from FIG. 1 and FIG. 2, the synchronous machine 100 comprises a signal transmission device 20 for contactlessly transmitting an operating signal corresponding to a DC voltage to the synchronous machine stator 104. On the synchronous machine rotor 101, the signal transmission device 20 comprises a coil 21 connected in series with the synchronous machine rotor coil 103, which coil is also referred to as the signal coil 21 in the following. Thus, during operation, the signal coil 21 co-rotates with the synchronous machine rotor coil 103 around the rotation axis 90. Furthermore, the signal transmission device 20 comprises a magnetic field sensor 23 on the synchronous machine stator 104. Thus, during operation, the signal coil 21 rotates relative to the magnetic field sensor 23 around the rotation axis 90. The magnetic field sensor 23 is configured to detect the magnetic field generated by the signal coil 21 and output a sensor signal according to the detected magnetic field. During operation, the signal coil 21 connected in series with the synchronous machine rotor coil 103 carries the same current as the synchronous machine rotor coil 103. Thus, the load current flows through the signal coil 21. In the process, the signal coil 21 generates a magnetic field, the strength of which is proportional to the load current. The magnetic field generated by the signal coil 21 is also referred to as the signal magnetic field in the following. By detecting the signal magnetic field, an operating signal corresponding to the load current and thus the DC voltage is transmitted to the synchronous machine stator 104 in a contactless manner. In the illustrated exemplary embodiment, the signal coil 21 is configured as an air-core coil 22. Furthermore, the magnetic field sensor 23 in the illustrated exemplary embodiment is configured as a Hall effect sensor 24, which is also referred to simply as a Hall sensor 24.

[0049] 2, the signal coil 21 is preferably arranged on the axial end face of the rotor shaft 102 in the illustrated exemplary embodiment. The magnetic field sensor 23 then axially enters the signal coil 21. The magnetic field sensor 23 is thus surrounded in the circumferential direction 91 by the signal coil 21. This makes the detection of the signal magnetic field more reliable and / or reduces noise signals in the magnetic field sensor 23.

[0050] 2, the signal coil 21 is surrounded in the circumferential direction 91 by an axially open sleeve 25. The sleeve 25 is thus arranged on the side of the signal coil 21 that is radially outwardly away from the magnetic field sensor 23. In the illustrated exemplary embodiment, the sleeve 25 is non-rotatably mounted on the rotor shaft 102. The sleeve 25 functions, inter alia, as a magnetic shield.

[0051] In the exemplary embodiment shown, the supply of DC voltage to the synchronous machine rotor coil 103 is performed inductively, by means of an electric rotary transformer 1 for inductive energy transfer, as shown in Figures 1, 3 and 4. The rotary transformer 1 comprises a stator 2 and a rotor 4. The stator 2 is hereinafter called rotary transformer stator 2. The rotor 4 is hereinafter called rotary transformer rotor 4. The rotary transformer rotor 4 is non-rotatable with respect to the synchronous machine rotor 101. The rotary transformer stator 2 is fixed with respect to the synchronous machine stator 104. Thus, during operation, the rotary transformer rotor 4 co-rotates with the synchronous machine rotor 101 around the rotation axis 90 with respect to the rotary transformer stator 2. For inductive energy transfer, the rotary transformer stator 2 comprises a primary coil 3 and the rotary transformer rotor 4 comprises a secondary coil 5. The primary coil 3 and the secondary coil 5 are arranged axially opposite each other in the exemplary embodiment shown, as is evident from figures 3 and 4. In operation, the primary coil 3, also referred to hereinafter as transformer primary coil 3, induces an AC voltage, also referred to hereinafter as transformer voltage, in the secondary coil 5, also referred to hereinafter as transformer secondary coil 5. The signal transmission device 20 may be part of the rotary transformer 1. As is evident from figure 1, in order to supply the synchronous machine rotor coil 103 with the required DC voltage, a rectifier circuit 6, which is non-rotatable with respect to the synchronous machine rotor 101, is connected between the transformer secondary coil 5 and the synchronous machine rotor 103, which rectifier circuit 6 converts the transformer voltage into a DC voltage. In the exemplary embodiment shown in figure 1, the rectifier circuit 6 is configured purely exemplarily as a bridge rectifier 16 with four diodes D1-4.

[0052] In effect, the signal coil 21 and the transformer secondary coil 5 are preferably magnetically separated from each other, for this purpose the signal coil 21 and the transformer secondary coil 5 are radially spaced apart from each other.

[0053] To induce the transformer voltage in the transformer secondary coil 5, the transformer primary coil 3 requires an AC voltage. As is evident from FIG. 1, in the illustrated exemplary embodiment, the transformer primary coil 3 is supplied via a power source 201, which supplies a DC voltage. The power source 201 in the illustrated exemplary embodiment is a battery 202 of the vehicle 200. To supply the transformer primary coil 3 with a DC voltage, an inverter circuit 7 is provided between the power source 201 and the transformer primary coil 3. The inverter circuit 7 converts the DC voltage of the power source 201 into an AC voltage to be supplied to the transformer primary coil 3. It is conceivable that the inverter circuit 7 comprises a converter. The synchronous machine stator coil 105 can be electrically supplied in the same way (not shown). In the illustrated exemplary embodiment, the inverter circuit 7 is configured, purely by way of example, as a sine wave inverter 17, which comprises four transistors T1-4 and two controllers GU1, GU2.

[0054] In the illustrated exemplary embodiment, as is evident from Fig. 1, the signal transmission device 20 comprises a device 26 fixed with respect to the synchronous machine stator 104, electrically connected to the magnetic field sensor 23 and for receiving and processing the sensor signal generated by the magnetic field sensor 23. The device 26 is also referred to as processing device 26 in the following. By means of the processing device 26, the operation of the synchronous machine 100, in particular the rotary transformer 1, can be adapted and / or modified depending on the load current of the synchronous machine rotor coil 103. For this purpose, the inverter circuit 7 can be communicatively connected with at least one of the controllers GU1, GU2 (not shown).

[0055] As is evident from Fig. 3 and Fig. 4, the rotating transformer rotor 4 in the illustrated exemplary embodiment comprises a circuit board 8, on which a transformer secondary coil 5 is provided. The circuit board 8 is configured in the shape of a disk, circular, i.e. in the shape of a disk or ring. The transformer secondary coil 5 in the illustrated exemplary embodiment comprises at least one trace 9 of the circuit board 8, which trace is also referred to below as a transformer trace 9. In the illustrated exemplary embodiment, the transformer secondary coil 5 consists of at least one transformer trace 9 and is configured as a flat winding 10. As is evident from Fig. 3, the circuit board 8 may comprise two transformer traces 9, which are axially spaced apart from each other, and which spirally surround the axis of rotation 90. In the illustrated exemplary embodiment, the at least one transformer trace 9 is entirely arranged in the circuit board 8. The non-rotatable connection of the rotor shaft 102 with the rotating transformer rotor 4 is achieved in the illustrated exemplary embodiment via a central opening 14 in the rotating base plate 8, through which the rotor shaft 102 engages, as is evident from Figures 3 and 4.

[0056] As is particularly clear from figures 3 and 4, the transformer primary coil 3 in the illustrated exemplary embodiment is configured as a flat coil 11. The transformer primary coil 3 and the transformer secondary coil 5 are arranged in a magnetic core 12, in particular a ferrite core 13, which is fixed in the illustrated exemplary embodiment with respect to the rotating transformer stator 2. In the following, the magnetic core 12 is also called the transformer core 12. The transformer core 12 is radially open, so that the circuit board 8 with the transformer secondary coil 5 enters the transformer core 12 and is arranged there so as to be able to rotate. Furthermore, the transformer core 12 comprises an axially open recess 15, in which the transformer secondary coil 3 is arranged.

Claims

1. A separately excited electric synchronous machine (100), The separately excited electric synchronous machine has a synchronous machine rotor (101), the rotor having a rotor shaft (102) and a synchronous machine rotor coil (103) non-rotatably mounted on the rotor shaft (102), the rotor coil being supplied with a DC voltage during operation to generate a rotor magnetic field; the separately excited electric synchronous machine has a synchronous machine stator (104) with a synchronous machine stator coil (105) fixed relative to the synchronous machine stator (104), the stator coil generating a stator magnetic field during operation, the stator coil interacting with the rotor magnetic field such that the synchronous machine rotor (101) rotates about an axis of rotation (90) during operation; The separately excited electric synchronous machine has a signal transmission device (20) for non-contact transmission of an operating signal corresponding to the DC voltage to the synchronous machine stator (104), The signal transmission device (20) comprises a signal coil (21) on the synchronous machine rotor (101) connected in series with the synchronous machine rotor coil (103), and a magnetic field sensor (23) on the synchronous machine stator (104), and during operation, the magnetic field sensor detects a magnetic field generated by the signal coil (21); The signal coil (21) is disposed on an axial end surface of the rotor shaft (102); The magnetic field sensor (23) is configured to be inserted in the axial direction of the rotor shaft (102) relative to the signal coil (21). A separately excited electric synchronous machine (100).

2. The signal coil (21) is configured as an air-core coil (22).

2. The synchronous machine according to claim 1.

3. The signal coil (21) is surrounded in a circumferential direction (91) by a sleeve (25) that is open in the axial direction.

2. The synchronous machine according to claim 1.

4. The sleeve (25) is non-rotatably attached to the synchronous machine rotor (101). The synchronous machine according to claim 3.

5. 2. A synchronous machine according to claim 1, The synchronous machine (100) comprises an electrical rotary transformer (1) for inductive energy transmission, The rotary transformer (1) comprises a rotary transformer stator (2) having a transformer primary coil (3), the rotary transformer stator being fixed relative to the synchronous machine stator (104); the rotary transformer (1) comprises a rotary transformer rotor (4) having a transformer secondary coil (5), the rotary transformer rotor being fixed non-rotatably with respect to the synchronous machine rotor (101), so that during operation the rotary transformer rotor (4) rotates around the rotation axis (90) with respect to the rotary transformer stator (2); During operation, the transformer secondary coil (5) and the transformer primary coil (3) undergo mutual induction to generate a transformer voltage in the transformer secondary coil (5); the synchronous machine rotor coil (103) is connected to the transformer secondary coil (5) so that the DC voltage for generating the rotor magnetic field is supplied to the synchronous machine rotor coil (103). Synchronous machine.

6. characterised in that the signal coil (21) and the transformer secondary coil (5) are radially spaced apart from each other. The synchronous machine according to claim 5.

7. a rectifier circuit (6) is connected between the transformer secondary coil (5) and the synchronous machine rotor coil (103), and the rectifier circuit converts the transformer voltage into the DC voltage. The synchronous machine according to claim 5.

8. The transformer primary coil (3) and the transformer secondary coil (5) are arranged opposite to each other in the axial direction. The synchronous machine according to claim 5.

9. The magnetic field sensor (23) comprises a Hall effect sensor (24).

2. The synchronous machine according to claim 1.

10. the signal transmission device (20) comprises a processing device (26) fixed relative to the synchronous machine stator (104), the processing device being electrically connected to the magnetic field sensor (23) for receiving a sensor signal generated by the magnetic field sensor (23).

2. The synchronous machine according to claim 1.

11. A motor vehicle (200) comprising a synchronous machine (100) and a power source (201) according to claim 5, The power source (201) is connected to the transformer primary coil (3) via an inverter circuit (7). Automobiles (200).

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