Motor assembly

Abstract

An electric motor assembly, the electric motor assembly having: an electric motor including a rotor; a sensor assembly for detecting an angular position of the rotor, the sensor assembly comprising a magnet and a magnetic field sensor device; and a housing having a rotor region in which the rotor is arranged and a circuit region in which the circuit region is spatially separated from the rotor region by the housing wall and in which the magnetic field sensor device is arranged, the rotor comprising an end region (23) facing the housing wall and having a magnet, and wherein the magnetic field sensor device (29) is designed to detect a magnetic field of the magnet (27) penetrating the housing wall (19) and to provide angular position information relating to an angular position of the rotor (9). The utility model provides an alternative scheme for detecting the position of the rotor, and the position of the static rotor can also be detected through the scheme.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of motor assemblies, which has sensor assembly for detecting the angular position of the rotor of motor.

[0002] The motor comprises a non-rotating stator and a rotating rotor, both having magnetic regions. The rotor can be an inner rotor driven in the stator. Alternatively, the rotor can also be an outer rotor rotating around the stator and driven. The magnetic field interaction of the magnetic regions causes the rotor to rotate. The stator has stator coils which generate a time-varying magnetic field as a magnetic region depending on the current flowing through the stator coils. The commutation of the stator coils, i.e. the manipulation of the current phase of the stator coils, can be optimized by the position information of the rotor, so that the magnetic regions of the stator coils energized depending on the time and the rotor are aligned with each other during operation, thereby optimizing the performance of the motor.

[0003] During operation, the rotor position can be detected by a sensorless method, for example by a software-based current and voltage analysis, which only works for a rotating rotor, however.

[0004] A conventional angle detection can also be carried out by an encoder, the cable connection of which, for example, passes through the motor and is guided to the power electronics for manipulating the motor by an LV (low voltage) plug. When using an injection method for angle detection, the initial position of the rotor is estimated by monitoring the detected motor current signal in response to the injection signal as a feed-in. This solution can be used, for example, for electrically driven turbochargers which operate at low speed start. BACKGROUND

[0005] EP 1 182 461 A2 shows a sensor for detecting the direction of a magnetic field. It comprises a single magnetic field concentrator of flat shape and at least one first and second horizontal Hall element, wherein the Hall elements are arranged in the edge region of the magnetic field concentrator. The magnetic field concentrator changes the field line course of the magnetic field in its surroundings and in particular causes field lines which without the magnetic field concentrator would run parallel to the surface of the Hall elements to penetrate these Hall elements substantially perpendicularly to the surface of the Hall elements. Instead of horizontal Hall elements, vertical Hall elements can also be used if the vertical Hall elements are arranged next to the magnetic field concentrator. The sensor is particularly suitable as an angle sensor.

[0006] WO 2019 / 001629 A1 shows a method for correcting the position of a magnet relative to a GMR sensor, by which method the position of a rotor is inferred by an evaluation unit on the basis of a variable magnetic field generated by a magnet fastened at the rotor of a drive unit. In a method in which a high-precision signal output of the GMR sensor can be achieved, the optimum operating range of the GMR sensor is derived on the basis of the direction and / or rotation of the magnetic sum vector of the magnetic field spanned by the magnet, in such a way that the magnetic field strength in the plane spanned by the sum vector is measured by using a second magnetic field sensor.

[0007] US 7 489 127 B2 shows a measuring system for contactless detection of a rotational angle, having a first body at which at least one magnet is arranged, and at least one magnetic field-sensitive element for generating a measurement signal, which is carried by a second body, wherein the first body and the second body are relatively rotatable about a rotational axis, and the magnet has a blind-hole-like recess. The at least one magnetic-sensitive element at least partially projects into the recess. Utility model content

[0008] The object is to give an alternative for detecting the position of a rotor, by which also the position of a stationary rotor can be detected.

[0009] The object is achieved by an electric motor assembly having the features described in the utility model.

[0010] An electric motor assembly having an electric motor comprising a rotor, a sensor assembly for detecting the angular position of the rotor, the sensor assembly comprising a magnet and a magnetic field sensor device, and a housing having a rotor region in which the rotor is arranged and a circuit region which is spatially separated from the rotor region by a housing wall and in which the magnetic field sensor device is arranged, wherein the rotor comprises an end region with the magnet facing the housing wall, and the magnetic field sensor device is designed to detect the magnetic field of the magnet penetrating the housing wall and to provide angular position information about the angular position of the rotor.

[0011] The electric motor assembly has an electric motor comprising a rotor, a sensor assembly for detecting the angular position of the rotor, the sensor assembly comprising a magnet and a magnetic field sensor device, and a housing having a rotor region in which the rotor is arranged and a circuit region which is spatially separated from the rotor region by a housing wall and in which the magnetic field sensor device is arranged. The rotor comprises an end region with the magnet facing the housing wall, and the magnetic field sensor device is designed to detect the magnetic field of the magnet penetrating the housing wall and to provide angular position information about the angular position of the rotor.

[0012] In addition to the rotor, the electric motor comprises a stator with stator coils. The angular position indicates the position of the rotatable rotor as a rotational position of the rotor. The angular position is the angle between a predetermined point on the rotor and a predetermined point of the surrounding environment, in particular of the stator. From the angular position it can be inferred how the magnetic regions of the rotor are aligned with respect to the stator coils. The manipulation of the current phase is based on the detected angular position of the rotor and can be optimized depending on the angular position information provided by the sensor assembly, so that the time-varying magnetic field induced in the stator coils and the rotor have a predetermined alignment with each other or tend towards such an alignment during operation. The manipulation of the electric motor can be carried out by a control circuit.

[0013] The sensor arrangement comprises a magnet which is non-rotatably connected with the rotor and rotates with the rotor and whose magnetic field can be detected by a magnetic field sensor assembly which is arranged on the other side of the rotor and thus does not rotate with the rotor. The detected orientation of the magnetic field with respect to the magnetic field sensor assembly corresponds to the angular position of the rotor, so that the angular position information relating to the detected magnetic field indicates the angular position of the rotor. This angular position information can be, for example, a voltage value which relates to the orientation of the magnetic field and thus to the angular position, or this angular position information can be transmitted digitally.

[0014] The magnet and the magnetic field sensor assembly are spatially separated from each other by a housing wall. The magnet is arranged in a rotor region. The rotor region is the region of the housing in which the rotor is arranged. The stator can also be arranged in this region. The magnetic field sensor assembly is arranged in a circuit region which is provided for electronics. In the simplest case, this can comprise only the magnetic field sensor assembly. Usually, a control circuit for the electric motor is also provided in the circuit region. The rotor region and the circuit region do not necessarily have to be spaces which are completely or largely surrounded by the housing, but they are rather defined by the housing wall which separates these regions.

[0015] In contrast to a sensorless solution for the detection of the angular position, a sensor assembly is provided in this electric motor assembly. The sensor assembly is designed to detect the angular position also by means of a magnetic field which penetrates the housing wall which acts as a separating wall between the electric motor and the circuit region as an electronics region, when the rotor is in a stationary state. The electric motor can be manipulated by means of the determined angular position information in such a way that the maximum torque is achieved at 0 revolutions per minute at start-up. The current required at start-up is thus smaller and a higher efficiency is achieved. The described electric motor assembly is robust and cost-effective. It can be used for torque-dependent electric motor applications at low rotational speeds, for example for auxiliary power assemblies. This solution has advantages in particular for electric motor applications with high torque requirements at low rotational speeds.

[0016] Compared to sensorless systems, less effort is required for detecting and processing the detected signal and the microcontroller, which is provided for controlling the electric motor depending on the angular position, is less expensive. A more advantageous current detection can be achieved.

[0017] In an embodiment, the magnetic field sensor device comprises at least two Hall sensors designed to detect the magnetic field of the magnet penetrating the housing wall. The Hall sensors through which the current flows provide an output voltage proportional to the vector product of the magnetic flux density and the current.

[0018] The rotor comprises a rotating part and in an embodiment, the rotor can have an outer rotor which rotates externally around the stator and is driven. The end region in which the magnets are arranged is an end face region, however in this case, the radially spaced rotor region can still extend beyond the end region with the magnets. In an embodiment, the rotor comprises a rotor shaft at the end face of which the magnets are arranged. However, the outer rotor can extend in the axial direction beyond the end region with the magnets on the rotor shaft, so that the end region with the magnets is not necessarily the farthest axial extension of the rotor. The magnets are connected to the rotor shaft in a rotationally fixed manner, so that they rotate with the rotor shaft and the angular position can be detected from the magnetic field. This connection can be made by means of, for example, gluing, clamping or screwing. For the end-side arrangement, the magnets are oriented towards the housing wall and can be positioned at a short distance from the magnetic field sensor device.

[0019] In an embodiment, the rotor comprises a disc rotor. Advantageously, the rotor is disc-shaped.

[0020] In an embodiment, the housing wall penetrated by the magnetic field comprises aluminium. Aluminium is lightweight and is therefore very suitable for the housing.

[0021] The housing wall separates the rotor region and the circuit region from each other, in which the electronics are arranged in general. Advantageously, the circuit region is separated from the rotor region in a liquid-tight manner, so that contamination and water ingress, which can have a negative effect in the circuit region, are avoided. The magnetic field sensor device and the magnets are spatially separated by the housing wall. They are arranged on opposite sides of the housing wall, wherein advantageously, the magnets do not contact the housing wall, but the magnetic field sensor device can be fastened at the housing wall. In an embodiment, the magnetic field sensor assembly and the magnets are arranged on the rotation axis of the rotor. This arrangement of the magnets prevents the rotor from being unbalanced.

[0022] Magnetic bodies designed as permanent magnets do not require a power supply, so that the power supply and the actuation of the sensor assembly are provided only for the magnetic field sensor device and, in particular, by means of the circuit area. The supply and actuation by means of the rotor area are avoided and thus possible interactions with the rotor and the stator during operation are avoided. It is thus not necessary to guide wires for the sensor assembly, which can have to be sealed, into the rotor area.

[0023] Advantageously, a control circuit for the electric motor is designed to actuate the commutation of the electric motor in accordance with the angle position information. For this purpose, a control circuit interface is provided in the magnetic field sensor device. The magnetic field sensor device and the control circuit can be designed as separate modules or as an integrated unit. The latter is an integrated power electronics with angle sensor, in particular for commutation at low rotational speeds.

[0024] In an embodiment, the Hall sensors are arranged on a separate circuit board. The control circuit for the actuation of the electric motor is arranged on a further circuit board in the circuit area and is connected to the magnetic field sensor device in an electrically conductive manner. The separate circuit board, which is only dimensioned to be sufficient for receiving and contacting the magnetic field sensor device, can be arranged with a great degree of freedom close to the housing wall in order to optimize the distance of the Hall sensors from the magnets for the detection of the magnetic field. The circuit board can be arranged, for example, on a base of the further circuit board, at the back of the housing wall or in a housing receiving device of the circuit board. Arranging the sensors on a separate, small circuit board enables the field-sensitive sensor electronics to be positioned as close as possible to the magnets that indicate the rotor position. The insulation requirements can also be better met by the separate circuit board for the sensors. In an alternative embodiment, the magnetic field sensor device and the control circuit are arranged on the same circuit board.

[0025] In an embodiment, the control circuit comprises a high-voltage area and / or a high-current area, which is at a greater distance from the magnets and thus from the housing wall than the magnetic field sensor device. For both circuit boards, this can be achieved by arranging the circuit board with the magnetic field sensor device closer to the housing wall and thus to the magnets than the circuit board with the control circuit.

[0026] In an embodiment, the magnetic field sensor device is at a smaller radial distance from the rotational axis of the rotor than the high-voltage area and / or the high-current area. The position of the magnetic field sensor device is thus closer to the magnets than the high-voltage area and / or the high-current area in the peripheral area on the circuit board.

[0027] In an embodiment, the powering and the actuation of the sensor assembly can at least partially be performed by means of electrical contacts for external powering of the entire electric motor assembly, the magnetic field sensor device being connected in an electrically conductive manner to these electrical contacts. Such an electrically conductive connection can comprise a cable.

[0028] Advantageously, the magnetic field sensor device comprises at least two Hall sensors.

[0029] Advantageously, the rotor comprises a rotor shaft, the magnets being arranged at an end face of the rotor shaft and being connected to the rotor shaft in a rotationally fixed manner.

[0030] Advantageously, the housing wall comprises aluminum.

[0031] Advantageously, the circuit area is separated from the rotor area in a liquid-tight manner.

[0032] Advantageously, the magnetic field sensor device and the magnets are arranged adjacent to opposite sides of the housing wall in a spatially mutually separated manner by the housing wall.

[0033] Advantageously, the magnetic field sensor device and / or the magnets are arranged on the rotational axis of the rotor.

[0034] Advantageously, the power supply and the actuation of the sensor assembly comprise only the powering and the actuation of the magnetic field sensor device.

[0035] Advantageously, the electric motor assembly comprises a control circuit for the electric motor, the control circuit being designed for actuating the commutation of the electric motor depending on the angular position information.

[0036] Advantageously, the at least two Hall sensors of the magnetic field sensor device are arranged on a circuit board, and the control circuit is arranged on the same circuit board or on a further circuit board in the circuit area and is connected in an electrically conductive manner to the magnetic field sensor device.

[0037] Advantageously, the control circuit comprises a high-voltage area and / or a high-current area, the high-voltage area and / or the high-current area being arranged at a greater distance from the magnets than the magnetic field sensor device.

[0038] Advantageously, the magnetic field sensor device is arranged at a smaller distance from the rotational axis of the rotor than the high-voltage area and / or the high-current area.

[0039] Advantageously, the electric motor assembly comprises electrical contacts for external powering and / or external control of the electric motor assembly, the magnetic field sensor device being coupled in an electrically conductive manner to the electrical contacts.

[0040] Advantageously, the electrically conductive connection of the control circuit with the magnetic field sensor device comprises a cable connection.

[0041] Advantageously, the rotor of the electric motor assembly comprises an outer rotor or a disc rotor.

[0042] Advantageously, the power supply and the actuation of the sensor assembly are carried out via the circuit area. BRIEF DESCRIPTION OF DRAWINGS

[0043] Some embodiments are explained in more detail below with reference to the drawings. In the drawings:

[0044] Figure 1 a cross-sectional schematic view of an embodiment of an electric motor assembly of a fan is shown, and

[0045] Figure 2 a cross-sectional schematic view of a further embodiment of an electric motor assembly is shown.

[0046] In the drawings, identical or functionally identical components are provided with the same reference signs. DETAILED DESCRIPTION

[0047] Figure 1 A cross-sectional schematic view of an embodiment of an electric motor assembly 1 of a fan is shown, in the front of which a fan wheel adapter 3 is arranged. At the fan wheel adapter 3 a fan wheel (not shown in the figures) can be mounted. Such a fan can be used for cooling, for example, in an electrically driven or fuel cell driven electric vehicle. Alternative fields of application can also be envisaged in the case of a drive of a vehicle auxiliary device. Figure 1

[0048] The electric motor 5 of the electric motor assembly 1 comprises a stator 7 and a rotatable rotor 9, which comprises a bell-shaped outer rotor and a rotor shaft 47. The outer rotor is arranged non-rotatably at the rotor shaft 47, which extends in the stator 7. The rotor 9 and the stator 7 are arranged in a housing 11 which is composed of multiple parts.

[0049] The housing 11 comprises a rotor area 13 in which the rotor 9 is arranged and a circuit area 15 in which a control circuit 17 for powering and actuating the electric motor 5 is arranged. The rotor area 13 comprises a trough-shaped housing part 12 which extends partially between the rotor shaft 47 and the stator 7. The circuit area 15 is a housing chamber which is located on the side of the housing 11 which faces away from the fan wheel adapter 3. Between the rotor area 13 and the circuit area 15 a housing wall 19 made of aluminum or an alloy containing aluminum is arranged which separates the two areas 13, 15 from one another. In the present embodiment, the housing wall 19 is a bottom area of the trough-shaped housing part 12. ​

[0050] The circuit region 15 is a cavity which is separated from the rotor region 13 in a liquid-tight manner, in particular in a water-tight manner. The liquid-tight sealing prevents gases conveyed by the fan as well as dirt and liquids from entering, which thus do not interact with the electrical components arranged in the circuit region 15, reducing the risk of failure and delaying the aging thereof.

[0051] The rotor 9 is rotatably supported in the housing 11 by means of a plurality of bearings 21. The bearings 21 are arranged between the slot-shaped housing portion 12 and a rotor shaft 47. A first end region 23 of the rotor shaft 47 projects out of the housing 11 and is connected to the fan wheel adapter 3 in a rotationally fixed manner, such that the rotation of the rotor 9 is transmitted to the fan wheel adapter 3. A second end region 25 of the rotor shaft 47, opposite the first end region 23, is directed towards the housing wall 19 which separates the rotor region 13 from the circuit region 15.

[0052] In addition to the magnetic region at the bell-shaped rotor, the rotor 9 comprises a rotor shaft 47, at the end face of which, as an end region of the rotor 9, a magnet 27 is arranged, wherein the magnet 27 is connected to the rotor shaft 47 in a rotationally fixed manner. The magnet 27 is arranged at the second end region 25 directed towards the housing wall 19. In the present embodiment, the magnet 27 is arranged in a recess on the end side of the rotor shaft 47. The magnet 27 is a permanent magnet.

[0053] In the circuit region 15, a magnetic field sensor device 29 for detecting the angular position of the rotor 9 is arranged. The magnetic field sensor device 29 is designed to detect the magnetic field of the magnet 27 which penetrates the housing wall 19 and to provide information on the angular position of the rotor 9.

[0054] The magnet 27 and the magnetic field sensor device 29 form a sensor assembly 31 which is arranged on both sides of the housing wall 19 and which enables the detection of the angular position by means of the housing wall 19 by detecting the magnetic field which penetrates the housing wall. The housing wall 19 comprises aluminum or an aluminum alloy. Its thickness, its material and the distance of the magnet 27 from the magnetic field sensor device 29 are selected in such a way that the magnetic field can penetrate the housing wall 19 and can be detected with sufficient accuracy to determine the angular position. A typical distance is in the range of 5 mm.

[0055] The magnetic field sensor device 29 comprises at least one Hall sensor 33 with a semiconductor layer. Advantageously, at least two Hall sensors 33 are provided. The provision of more Hall sensors 33 increases the accuracy. In the case of a feed, the Hall sensor 33 provides an output voltage which is proportional to the magnitude of the vector product of the magnetic flux density of the magnetic field flowing through the semiconductor layer and the current. The angular position of the magnet 27, which corresponds to the angular position of the rotor 9, can be determined therefrom. The angular position can also be detected by the sensor assembly 31 when the rotor is in a stationary state.

[0056] The magnetic field sensor device 29 comprises a circuit board 35 on which the Hall sensors 33 are arranged and which operates, supplies and provides the output variables of the Hall sensors 33 as angular position information. The circuit board 35 is arranged in a bowl-shaped receptacle 39 at the housing wall 19, so that the Hall sensors 33 are positioned on the other side of the housing wall 19 adjacent to the magnet 27 and at a distance suitable for magnetic field detection. The magnetic field sensor device 29 can be fixed, for example, by means of adhesion or screwing. In the present embodiment, both the magnetic field sensor device 29 with the Hall sensors 33 and the magnet 27 are arranged on the rotational axis of the rotor 9. The Hall sensors 33 are connected in an electrically conductive manner to the control circuit 17 for the electric motor 5 in the electrical circuit region 15 by means of a cable connection 41. The control circuit 17 is designed on a further circuit board 37. It comprises a plurality of electrical components, primarily a microcontroller, arranged on the further circuit board 37 for operating and supplying the electric motor 5. The control circuit 17 operates, supplies and provides the output variables of the Hall sensors for the control circuit by means of the cable connection 41. The microcontroller of the control circuit 17 operates the commutation of the electric motor 5 in accordance with the angular position information provided by the magnetic field sensor device 29.

[0057] Alternatively, the magnetic field sensor device 29 with the Hall sensors 33 can also be arranged on the same circuit board 37 as the control circuit 17. In an embodiment, the Hall sensors 33 are arranged on a separate circuit board 35 which is arranged on a pedestal on the circuit board 37 of the control circuit 17. The electrical connection is also made by means of the pedestal. The pedestal positions the Hall sensors 33 sufficiently close to the housing wall 19 and the magnet 27 and thus enables the angular position detection.

[0058] In the present embodiment, the control circuit 17 has a high-current region 53 which is arranged spaced apart from the magnetic field sensor device 29 so as not to influence the measurement or only to have a slight influence thereon.

[0059] The current itself generates a magnetic field, which may interfere with the measurements of the magnetic field sensor device 29. The Hall sensor 33 should be positioned as close as possible to the housing wall 19 to allow the magnetic field of the magnet 27 to flow through it as strongly as possible. For insulation reasons, high-voltage areas, or especially high-voltage areas, require a greater distance from the housing wall 19. However, this distance may be too large for the magnetic field sensor device 29 with its Hall sensor 33. Therefore, the magnetic field sensor device 29 is spaced apart from the circuit board 37 and closer to the housing wall 19. For current reasons, lateral spacing may also be sufficient for the high-current area 53, as its distance from the housing wall is less critical.

[0060] An alternative solution is a dome-shaped outward-flaring portion of the housing wall in the direction of the circuit board 37, into which the rotor shaft 47 with the magnet 27 extends, thereby positioning the magnet sufficiently close to the magnetic field sensor device 29 on the circuit board 37. However, due to voltage and current considerations, sufficient lateral distance is required between the high-voltage and high-current regions on the circuit board 37 and the outward-flaring housing wall and the magnetic field sensor device 29. The magnetic field sensor device 29 can be located in a region on the circuit board 37, particularly the central region, which is less distant from the magnet 27 than the regions on the same circuit board 37 where the high-voltage region 53 is located, particularly the peripheral regions.

[0061] like Figure 1 As shown, the separation can be achieved by arranging the magnetic field sensor device 29 and the high-voltage region 53 on different circuit boards. Compared to the high-voltage region 53, the magnetic field sensor device 29, which is closer to the magnet 27, is arranged closer to the housing wall 19.

[0062] Another possibility for positioning the magnetic field sensor device 29 closer to the magnet 27 is through a base on the circuit board.

[0063] However, a low-voltage region 51 can also be provided on the circuit board with the high-voltage region 53, the distance between the low-voltage region and the magnet 27 being less than the distance between the high-voltage region 53 and the magnet. For example, the magnetic field sensor device 29 and the low-voltage region 51 can be arranged in the center of the circuit board 37. The same applies to the arrangement of the low-current region. The above solutions can be combined.

[0064] The power supply and control of sensor assembly 31 are centralized in magnetic field sensor device 29 in circuit region 15. The Hall sensor 33 is not powered or controlled via rotor region 9. Magnet 27 is installed wirelessly. No electrical connection is required for this magnet, and as a permanent magnet, it does not require a power supply.

[0065] Figure 2A cross-sectional schematic view of a further embodiment of an electric motor assembly 1 is shown, which can be applied, for example, in the area of a vehicle. For this electric motor assembly 1, application in a fan can also be envisaged. An alternative field of application is a drive device, for example for a hydraulic pump. A further field of application is a compressor in an electric drive or auxiliary charger, for example for a fuel cell.

[0066] The following description focuses on the differences from the previous embodiments, in which the structural differences of the electric motor 5 and the housing 11 composed of multiple parts can already be clearly seen in the figures.

[0067] The electric motor assembly 1 comprises a housing 19 composed of multiple parts, in which the rotor 9 and the stator 7 are arranged. In this embodiment, the rotor 9 has a bell-shaped outer rotor and a rotor shaft 47, which extends in the stator 7 only in the front region of the housing 19. The outer rotor extends beyond the end region of the rotor shaft 48 at which the magnets 27 are arranged in the axial direction. The first end region 23 of the rotor 9 projects from the housing 19 and can be connected to Figure 2 further components, which are to be driven in rotation, are not shown. Such components can be, for example, a fan wheel, a compressor wheel or a transmission mechanism. At the end face of the second, opposite end region 25 of the rotor 9, at the rotor shaft 47, the magnets 27 are arranged.

[0068] In this embodiment, the electric circuit region 15 as a housing chamber also extends in a cylindrical manner from the rear housing region into the central region of the electric motor assembly 1. The cylindrical housing portion 12 extends to the end face of the rotor shaft at which the magnets 27 are mounted. The rotor region 13 and the electric circuit region 15 are separated by the housing wall 19 towards which the magnets 27 are oriented. In this embodiment, however, the control circuit 17 for the power supply and control of the electric motor 5 is not arranged in the electric circuit region 15, but externally.

[0069] The magnets 27 and the magnetic field sensor device 29 form a sensor assembly 31, which is arranged on both sides of the housing wall 19 and which enables angle position detection by the housing wall 19 in such a way that the magnetic field penetrating the housing wall is detected.

[0070] This embodiment is a remote arrangement for which the control circuit (not shown) Figure 2 is arranged externally. Three pin-like contact portions 43 are exemplarily provided on the back of the electric motor assembly 1, by means of which the electric motor 5 and the sensor assembly 31 can be controlled and supplied with power externally. The contact portions 43 project from the back of the housing 19 in the region of a plug 45.

[0071] The sensor assembly 31 comprises a magnet 27 and Hall sensors 33, which are surrounded by a magnetic field sensor device 29, which is arranged in the circuit region 15. Between these components 27, 29, the housing wall 19 is arranged, which separates the rotor region 13 from the circuit region 17 in a liquid-tight manner. On the side of the housing wall 19 facing away from the rotor 9, the magnetic field sensor device 29 is fastened at the housing wall 19. The Hall sensors 33 are electrically connected with contact parts 43 by means of a cable connection 41 extending through the circuit region 15.

[0072] The features presented above and obtainable from the drawings can be realized not only individually, but also advantageously in various combinations. The application is not restricted to the described embodiments, but can be varied in various ways within the capabilities of a person skilled in the art.

[0073] List of reference signs

[0074] 1 electric motor assembly

[0075] 3 fan wheel adapter

[0076] 5 electric motor

[0077] 7 stator

[0078] 9 rotor

[0079] 11 housing

[0080] 12 housing part

[0081] 13 rotor region

[0082] 15 circuit region

[0083] 17 control circuit

[0084] 19 housing wall

[0085] 21 bearing

[0086] 23, 25 end region

[0087] 27 magnet

[0088] 29 magnetic field sensor device

[0089] 31 sensor assembly

[0090] 33 Hall sensor

[0091] 35, 37 circuit board

[0092] 39 receptacle

[0093] 41 cable connection

[0094] 43 contact part

[0095] 45 plug

[0096] 47 rotor shaft

[0097] 51 low pressure area

[0098] 53 high pressure area

Claims

1. An electric motor assembly, characterized by The electric motor assembly has an electric motor (5) comprising a rotor (9), a sensor assembly (31) for detecting the angular position of the rotor (9), which sensor assembly comprises a magnet (27) and a magnetic field sensor device (29), and a housing (11) having a rotor region (13) in which the rotor (9) is arranged and a circuit region (15) which is spatially separated from the rotor region (13) by a housing wall (19) and in which the magnetic field sensor device (29) is arranged, wherein the rotor (9) comprises an end region (23) with the magnet (27) facing the housing wall (19) and the magnetic field sensor device (29) is designed to detect a magnetic field of the magnet (27) which penetrates the housing wall (19) and to provide angular position information about the angular position of the rotor (9).

2. The electric motor assembly of claim 1, wherein, The magnetic field sensor device (29) comprises at least two Hall sensors (33).

3. The electric motor assembly of claim 1, wherein, The rotor (9) comprises a rotor shaft (47) at the end face of which the magnet (27) is arranged and which is connected to the rotor shaft (47) in a rotationally fixed manner.

4. Motor assembly according to one of claims 1 to 3, characterized in that The housing wall (19) comprises aluminum.

5. The electric motor assembly of one of claims 1 to 3, characterized in that The circuit region (15) is separated from the rotor region (13) in a liquid-tight manner.

6. The electric motor assembly of one of claims 1 to 3, characterized in that The magnetic field sensor device (29) and the magnet (27) are arranged adjacent to opposite sides of the housing wall (19) in a manner spatially separated from one another by the housing wall (19).

7. The electric motor assembly of one of claims 1 to 3, characterized in that The magnetic field sensor device (29) and / or the magnet (27) are arranged on the axis of rotation of the rotor (9).

8. The electric motor assembly of one of claims 1 to 3, characterized in that The power supply and actuation of the sensor assembly (31) comprises only the supply and actuation of the magnetic field sensor device (29).

9. The electric motor assembly of claim 2, wherein, The electric motor assembly comprises a control circuit (17) for the electric motor (5), which control circuit is designed to actuate the commutation of the electric motor (5) depending on the angular position information.

10. The electric motor assembly of claim 9, wherein, The at least two Hall sensors (33) of the magnetic field sensor device (29) are arranged on a circuit board (35) and the control circuit (17) is arranged on the same circuit board (35) or on a further circuit board (37) in the circuit region (15) and is connected to the magnetic field sensor device (29) in an electrically conductive manner.

11. The electric motor assembly of claim 9, wherein, The control circuit (17) comprises a high-voltage region (53) and / or a high-current region which is at a greater distance from the magnet (27) than the magnetic field sensor device (29).

12. The electric motor assembly of claim 11, wherein, Compared to the high-voltage region (53) and / or the high-current region, the magnetic field sensor device (29) is at a smaller distance from the axis of rotation of the rotor (9).

13. The electric motor assembly of one of claims 1 to 3, characterized in that The electric motor assembly comprises electrical contacts (43) for external power supply and / or external control of the electric motor assembly (1), the magnetic field sensor arrangement (29) being coupled in an electrically conductive manner with the electrical contacts.

14. The electric motor assembly of claim 10, wherein, The electrically conductive connection of the control circuit (17) with the magnetic field sensor arrangement (29) comprises a cable connection (41).

15. The electric motor assembly of one of claims 1 to 3, characterized by The rotor (9) of the electric motor assembly comprises an external rotor or a disc rotor.

16. The electric motor assembly of claim 8, wherein, The power supply and the actuation of the sensor assembly (31) are performed via the circuit region (15).

Images