Electric motor

Abstract

An electric motor (1), in particular a brushless DC motor, comprises a control unit having a first control board (7) connected to a first measuring device (9) and a second control board (8) connected to a second measuring device (10), at least one connecting member (13, 13 ', 13' ') connecting the first control board (7) and the second control board (8), wherein the connecting member (13, 13 ', 13' ') is arranged in a receiving portion in a housing (6) of the electric motor (1).

Description

Technical Field

[0001] The invention relates to an electric motor, in particular a brushless direct current (BLDC) motor, comprising a control unit having a first control board connected to a first measuring device and a second control board connected to a second measuring device. Background Art

[0002] Electric motors for vehicles, for example for actuating functional units in gearboxes or transmissions, are well known in the prior art. For example, an electric motor can be used which comprises a rotor, the rotor shaft of which is connected to an output shaft via a transmission. The electric motor can be connected to a functional unit of the gearbox via the output shaft, such as a shift fork, an actuator of a clutch, etc. In such applications, it is usually necessary to simultaneously determine parameters of the rotor shaft and the output shaft, for example, the rotation speed of the input shaft and the rotation speed of the output shaft, or the rotation angle of the input shaft and the rotation angle of the output shaft. In order to determine the position of an actuator connected to the electric motor or an actuating device comprising the electric motor or to verify its position, it is advantageous to determine the parameters of the rotor shaft and the output shaft.

[0003] In order to simultaneously measure the parameters of the output shaft and the rotor shaft, two measuring devices are required. Typically, a first measuring device (e.g., a first sensor element) is arranged inside the motor near the end of the rotor shaft that is away from the output end of the motor (e.g., away from the output shaft). In order to measure a second parameter of the output shaft, a second sensor element may be arranged outside the motor housing, for example, provided by an external measuring device. The second sensor may be arranged near the end of the output shaft. Therefore, it is cumbersome to connect the sensor element to a common control board, such as a printed circuit board (PCB). Even if two different control boards are used, the wiring inside and outside the motor is complicated, and two different connecting elements are usually required, which complicates the wiring outside the motor for connecting the motor to a control unit, etc. Summary of the invention

[0004] An object of the present invention is to provide an improved electric motor.

[0005] This object is achieved by an electric motor according to claim 1. Advantageous embodiments are contained in the dependent claims.

[0006] As described above, the present invention relates to an electric motor, in particular an electric motor for a vehicle. The electric motor comprises a housing in which a first control board and a second control board are arranged. The first control board is connected to a first measuring device, for example a first sensor, such as a rotation speed sensor or an angle sensor, and the second control board is connected to a second measuring device, for example a second sensor, such as a rotation speed sensor or an angle sensor. The invention is based on the idea of ​​providing at least one connecting member, which connects the first control board and the second control board, wherein the connecting member is arranged in a receiving part in the housing of the electric motor.

[0007] In other words, the invention proposes to use or provide a connecting member arranged in the motor housing for connecting two control boards. Thus, advantageously, there is no need to connect the control boards separately outside the housing, nor is there a need to connect each control board separately to a common control unit. Thus, no separate connection ports, such as plugs or sockets, are required. Instead, the control board can be connected to the inside of the motor housing, so that the interface from the inside of the housing to a unit outside the motor (such as a central control unit) can be achieved via a single interface (such as a common connection port). Thus, two sensors can be connected simultaneously using one connector.

[0008] As a result, the requirements for the building space for arranging the electric motor, in particular with regard to the wiring of the individual control boards of the electric motor, can be reduced. In particular, only the building space around the electric motor needs to be used to realize a single connection to a single interface, wherein the interface is connected to two control boards, which in turn are connected via a connecting member arranged in a receiving part of the motor housing. In particular, two measuring devices can be arranged inside the electric motor, in particular inside the housing of the electric motor, so that there is no need to use external measuring devices, which are used, for example, to measure parameters of the output shaft. The common interface can, for example, be arranged axially between the two control boards, in particular as a common connection port.

[0009] According to an embodiment of the electric motor, at least one connecting member is at least partially arranged in a stator chamber defined by the stator base. Arranging the connecting member connecting the first control board and the second control board in the stator chamber can effectively utilize the construction space inside the motor housing. It is particularly possible to connect two control boards arranged at different axial positions inside the motor housing via the connecting member. By utilizing the free construction space inside the stator chamber, the wiring can be guided through the stator chamber, so that there is no need to expand the construction space required for the motor, for example without changing the housing of the motor. In addition, the connection can be achieved by a sturdy frame instead of a cable, because the connection is more resistant to vibrations. Therefore, the connecting member can provide a rigid structure, in particular, when it is installed inside the motor, the assembly process is simpler.

[0010] At least one connecting member may also be at least partially arranged in a stator groove. The stator matrix generally defines stator teeth and stator grooves, which are arranged alternately in the circumferential direction of the stator. The term "stator groove" may also be understood as "stator slot". Therefore, throughout the application, the term "stator groove" may be replaced by the term "stator slot". According to the current embodiment, the connecting member may be at least partially arranged in such a stator groove. Therefore, the construction space in the stator chamber may be effectively utilized, and the connecting member connecting the first control board and the second control board does not need to change the construction space, thereby eliminating the need to change the overall size of the motor.

[0011] As described above, the first measuring device can be assigned to the rotor shaft and the second measuring device can be assigned to the output shaft, for example, the input shaft of a transmission connected to the electric motor. According to one embodiment, the first measuring device can be arranged on the rotation axis of the rotor shaft and / or the second measuring device can be arranged on the rotation axis of the output shaft. Thus, the rotation speed and / or the rotation angle of the rotor shaft and / or the output shaft can be determined separately.

[0012] The electric motor comprises at least one connecting member for connecting the first control board to the second control board. A plurality of wires or contacts or pins for different signals can be guided through the connecting member, or different connecting members can be provided for providing different connections between the first control board and the second control board. In particular, the electric motor can comprise at least two, in particular three, connecting members. Different connections, for example different wires, can be assigned to at least two connecting members.

[0013] According to one embodiment, the electrical connection connecting the first control board and the second control board may also be arranged in only one connection member. Although a plurality of connection members physically connecting the control boards may be provided in the electric motor, only one of the plurality of connection members carries the electrical connection. In other words, the electrical connection is arranged in only one connection member and extends through only one connection member. Arranging the electrical connection in only one connection member provides advantages with respect to electromagnetic signals generated in the electric motor, in particular with respect to electromagnetic compatibility.

[0014] As described above, the rotor shaft of the electric motor is connected to an output shaft, for example an output shaft of a transmission connected to the rotor shaft, wherein the connection portion of the rotor shaft to the output shaft (for example via a gear) is arranged inside the housing of the electric motor. In this embodiment, the second control plate may comprise an opening, wherein the rotor shaft extends axially through the opening. Thus, the rotor shaft extends through a hole in the second control plate assigned to the output shaft. The rotor shaft and the output shaft are arranged essentially parallel to each other, wherein the rotor shaft extends through the opening in the second control plate, so that the arrangement of the control plate and the shaft in the housing of the electric motor is particularly compact.

[0015] The motor can be further improved by providing a connection port on a middle plane arranged axially between the control boards. As described above, by connecting the first control board to the second control board via a connecting member, the interface between the inside and the outside of the motor (for example, via a connection port) can be reduced to only one interface. In other words, both control boards can be connected to a connection port, which can be arranged on an axial middle plane between the control boards. The middle plane does not need to be arranged in the middle of the motor, although it is possible to arrange it in an intermediate position. The connection port can be located on a specific side of the motor.

[0016] According to another embodiment of the electric motor, a damping element may be provided, which is arranged between the housing of the electric motor and the first control plate.The damping element allows damping of vibrations and compensation of tolerances between the housing and the first control plate / rotor shaft arrangement.

[0017] Furthermore, the invention relates to an actuator assembly comprising an inventive electric motor as described above. Furthermore, the invention relates to a vehicle comprising an electric motor and / or an actuator assembly as described above. All details, advantages and features of the electric motor can be fully transferred to the actuator assembly and the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Exemplary embodiments of the present invention will be described with reference to the accompanying drawings. The accompanying drawings are schematic diagrams depicting:

[0019] Figure 1 is a schematic cross-sectional view of a motor according to one embodiment;

[0020] Figure 2 is a schematic cross-sectional view of a motor according to one embodiment;

[0021] Figure 3 is a schematic perspective view of a connection member for a motor according to one embodiment;

[0022] Figure 4 is a schematic perspective view of a connection member for a motor according to one embodiment;

[0023] Figure 5 is a schematic perspective view of a connection member for a motor according to one embodiment;

[0024] Figure 6 is a schematic perspective view of a motor according to one embodiment; and

[0025] Figure 7 is a schematic perspective view of a motor according to one embodiment. DETAILED DESCRIPTION

[0026] Figure 1 An electric motor 1 is shown, the rotor 2 of which is connected to a rotor shaft 3. The electric motor 1 further comprises a stator 4 defining a stator chamber 5. The electric motor 1 comprises a housing 6 surrounding the components of the electric motor 1. Inside the housing 6 a first control board 7 and a second control board 8 are arranged, wherein the first control board 7 carries a first measuring device 9 and the second control board 8 carries a second measuring device 10. The first measuring device 9 and the second measuring device 10 may comprise sensor elements, for example rotation speed sensors or angle sensors.

[0027] Figure 1 and Figure 2 It is also shown that the rotor shaft 3 extends through the opening 11 in the second control plate 8. The first measuring device 9 is arranged on the same rotation axis as the rotation axis of the rotor shaft 3, wherein the second measuring device 10 is arranged on the rotation axis of the output shaft 12, which is for example a shaft of a transmission attached to the electric motor 1 forming an actuator assembly 18.

[0028] like Figure 1 and Figure 2 As further shown, the first control board 7 is connected to the first control board 7 by a connecting member 13 (such as Figure 3-Figure 5 The connecting member 13 is arranged inside the housing 6 of the motor 1 and connects the control boards 7 and 8 inside the housing 6.

[0029] according to Figure 3 In the illustrated embodiment, a plurality of connecting members 13, 13', 13" may be provided, which extend axially through the stator chamber 5 for connecting the first control board 7, which is arranged on the side of the rotor shaft 3 away from the output shaft 12. The connecting members 13, 13', 13" extend through the stator grooves 14 formed inside the stator base 15. Therefore, the construction space required for the connecting members 13, 13', 13" does not change the total construction space required for the motor 1.

[0030] Figure 4 , Figure 5 The illustrated embodiment shows alternative connecting members 13, 13', 13", which are distributed in the circumferential direction and connected to each other. For example, three connecting members 13, 13', 13" can be arranged at different circumferential positions, in particular forming an angle of 120° between every two connecting members 13, 13', 13". Although the wires for connecting the control boards 7, 8 can be arranged in different connecting members 13, 13', 13", it is preferred to arrange the wires only in a single connecting member 13. This particularly improves electromagnetic compatibility.

[0031] Figure 6 , Figure 7The connecting members 13, 13', 13" connecting the first control board 7 and the second control board 8 are shown. Figure 7 As can be seen in the figure, the connecting members 13, 13', 13" all physically or mechanically connect the first control board 7 with the second control board 8 by extending through the stator groove 14 formed in the stator base body 15.

[0032] Figure 2 , Figure 6 , Figure 7 It is further shown that the connection port 16 is arranged in a middle plane which is arranged axially between the first control board 7 and the second control board 8, for example with respect to the rotation axis of the rotor shaft 3. Thus, the two control boards 7, 8 can be connected to each other and to a common connection port 16. Thus, when connecting the electric motor 1 to a control unit or a power supply, only one connection port 16 has to be used. This in particular reduces the wiring required for connecting the two control boards 7, 8 externally to the electric motor 1.

[0033] Figure 1 , Figure 2 Also shown is a damping element 17 arranged next to the first control plate 7. The damping element 17 can reduce vibrations caused by the electric motor 1. In particular, vibrations of the rotor shaft 3 can be reduced, since the vibrations transmitted to the housing 6 can be damped by the damping element 17. Furthermore, the damping element 17 can compensate for tolerances of the electric motor 1.

[0034] The electric motor 1 may in particular be part of an actuator assembly 18, which comprises the electric motor 1. For example, the actuator assembly 18 may comprise a transmission attached to the electric motor 1, which transmission provides the output shaft 12.

[0035] All features, details and advantages described in the individual figures may be combined, exchanged and transferred as required.

[0036] Reference numerals

[0037] 1 Electric motor;

[0038] 2 rotors;

[0039] 3 rotor shaft;

[0040] 4 stator;

[0041] 5. Stator chamber;

[0042] 6. Shell;

[0043] 7 first control panel;

[0044] 8 Second control panel;

[0045] 9 a first measuring device;

[0046] 10 second measuring device;

[0047] 11 Open your mouth;

[0048] 12 Output shaft;

[0049] 13-13" connecting member;

[0050] 14 stator grooves;

[0051] 15 stator base;

[0052] 16 connection ports;

[0053] 17 Damping element;

[0054] 18 Actuator assembly.

Claims

1. An electric motor (1), in particular a brushless DC motor, comprising a control unit having a first control board (7) connected to a first measuring device (9) and a second control board (8) connected to a second measuring device (10), characterized in that: At least one connecting member (13, 13', 13"), the at least one connecting member (13, 13', 13") connecting the first control board (7) and the second control board (8), wherein the connecting member (13, 13', 13") is arranged in a receiving portion in a housing (6) of the electric motor (1).

2. The electric motor (1) according to claim 1, characterized in that The at least one connecting member (13, 13', 13") is at least partially arranged in a stator chamber (5) defined by a stator base body (15).

3. The electric motor (1) according to claim 2, characterized in that The at least one connecting member (13, 13', 13") is at least partially arranged in a stator groove (14).

4. An electric motor (1) according to any one of the preceding claims, characterized in that The first determination device (9, 10) comprises a first rotation speed sensor assigned to a rotor shaft (3) of the electric motor (1), and / or the second determination device (9, 10) comprises a second rotation speed sensor assigned to an output shaft (12) of a gear unit connected to the rotor shaft.

5. An electric motor (1) according to any one of the preceding claims, characterized in that The first measuring device (9) is arranged on the rotation axis of the rotor shaft (3), and / or the second measuring device (10) is arranged on the rotation axis of the output shaft (12).

6. An electric motor (1) according to any one of the preceding claims, characterized in that The electric motor (1) comprises at least two, in particular three, connecting components (13, 13', 13").

7. The electric motor (1) according to claim 6, characterized in that The electrical connection connecting the first control board (7) and the second control board (8) is arranged in only one connecting member (13).

8. An electric motor (1) according to any one of the preceding claims, characterized in that The second control plate (7, 8) comprises an opening (11), wherein the rotor shaft (3) extends axially through the opening.

9. An electric motor (1) according to any one of the preceding claims, characterized in that The connection port (16) is arranged on a middle plane which is axially arranged between the control plates (7, 8).

10. An electric motor (1) according to any one of the preceding claims, characterized in that A damping element (17) is arranged between the housing (6) of the electric motor (1) and the first control plate (7).

11. An actuator assembly (18) comprising an electric motor (1) according to any one of the preceding claims.

12. A vehicle comprising an electric motor (1) according to any one of claims 1 to 10 and / or an actuator assembly (18) according to claim 11.

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