Electric machine having first angle sensor
By designing two angle sensors in the motor and monitoring the deviation by comparing the angle position of the rotor shaft determined by them, the problem of insufficient reliability in the determination of the angular position of the existing motor is solved, and higher reliability and fault identification capabilities are achieved.
Patent Information
- Application Number
- CN202311785127.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-22
- Publication Date
- 2025-06-24
AI Technical Summary
There is a problem of insufficient reliability in determining the angle position of the rotor shaft, making it difficult to effectively identify functional failures.
A motor is designed with two angle sensors, namely a hollow shaft encoder and a solid shaft encoder. The solid shaft encoder is connected to the rotor shaft through a coupling device, and by comparing the rotor shaft angle position determined by the two angle sensors, it is monitored whether the degree of deviation exceeds the allowable degree of deviation to identify functional failures.
Through redundant angle determination, the reliability of the motor is improved, and functional failures can be effectively identified to ensure that the motor operates as reliably as possible.
Smart Images
Figure CN120200422A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an electric motor having a first angle sensor. Background Art
[0002] As is well known, the angular position of the rotor shaft of an electric motor can be determined by an angle sensor. Summary of the Invention
[0003] Therefore, the object of the present invention is to enable the electric motor to operate as reliably as possible.
[0004] According to the present invention, this object is achieved by an electric motor having the features given in claim 1.
[0005] An important feature of the present invention is that the electric motor is provided with a first angle sensor,
[0006] wherein the first angle sensor has: a first fixed part, in particular an encoder stator; and a first rotatably supported rotating part, in particular an encoder rotor,
[0007] wherein the rotor shaft of the electric motor is non-rotatably connected to the first rotating part, in particular the encoder rotor, of the first angle sensor,
[0008] wherein the second angle sensor has: a second fixed part, in particular an encoder stator; and a second rotatably supported rotating part, in particular an encoder rotor,
[0009] wherein the rotor shaft of the electric motor is non-rotatably connected to the second rotating part, in particular the encoder rotor, of the second angle sensor by means of an intermediate coupling device.
[0010] The advantage here is that increased reliability can be achieved by means of redundant angle determination. Because functional failures can be identified by comparing the angular positions of the rotor shaft determined by the two angle sensors and by monitoring whether the permitted deviation degree is exceeded.
[0011] In an advantageous design, the first angle sensor is a hollow shaft encoder. The advantage here is that the first angle sensor is sleeved onto the rotor shaft.
[0012] In an advantageous design, the second angle sensor has a solid shaft encoder. The advantage here is that the weight is borne by the adapter, and the solid shaft is connected to the rotor shaft by means of a coupling device.
[0013] In an advantageous design, the first fixed part, in particular the encoder stator, of the first angle sensor is connected to the first side wall of the adapter by means of, in particular only by means of, a support plate, in particular for transmitting torque,
[0014] Wherein, the second fixed part of the second angle sensor, in particular the encoder stator, is connected to the second side wall of the adapter, in particular by means of threaded elements and threadedly connected to the second side wall of the adapter, in particular for transmitting torque.
[0015] Wherein, the first side wall and the second side wall are connected by means of tabs of the adapter.
[0016] In particular, the tabs are all arranged at the same radial distance. The advantage here is that the second angle sensor is carried by the adapter and torque is transmitted therefrom. However, the first angle sensor is carried by the rotor because the first angle sensor is fitted onto the rotor shaft as a hollow shaft encoder. Torque transmission is only achieved by means of a support plate which is fixed on one side to the adapter and on the other side to the first angle sensor.
[0017] In an advantageous design, the tabs are spaced apart from one another in the circumferential direction, in particular evenly. The advantage here is that the adapter achieves high rigidity.
[0018] In an advantageous design, each of the tabs extends more in the circumferential direction than in the radial direction, and / or the radial wall thickness of the tab is correspondingly smaller than the extension dimension in the circumferential direction.
[0019] Wherein, the first side wall and the second side wall are spaced apart in the axial direction. The advantage here is that high rigidity of the adapter is achieved.
[0020] In an advantageous design, the first angle sensor and the second angle sensor are spaced apart in the axial direction.
[0021] In particular, the axial direction is parallel to the axis of rotation of the rotor shaft of the electric motor, in particular, the circumferential direction and the radial direction are each based on the axis of rotation. The advantage here is that the reliability is increased by redundantly implementing the angle determination.
[0022] In an advantageous design, the solid shaft of the second angle sensor passes through the second side wall. The advantage here is that the solid shaft is connected to the coupling device.
[0023] In an advantageous design, the region covered by the tabs in the axial direction includes, in particular completely encloses, the region covered by the coupling device in the axial direction, in particular, the coupling device is axially spaced apart not only from the first side wall but also from the second side wall. The advantage here is that the coupling device is arranged inside the adapter.
[0024] In an advantageous design, the first side wall is fixed to the bearing cover of the electric motor.
[0025] Wherein, the bearing cover receives a bearing for rotatably supporting the motor rotor shaft. The advantage here is that the adapter is fixed to the bearing cover and is thus stably fixed.
[0026] In an advantageous design, the stator housing is arranged axially between the bearing cover and the bearing flange, and the bearing flange receives another bearing of the rotor shaft.
[0027] Wherein, the stator housing is connected to the bearing cover and to the bearing flange. The advantage here is that the rotor shaft is stably supported.
[0028] In an advantageous design, the support plate is designed to be bent multiple times,
[0029] In particular, wherein the bends are formed radially, but especially not circumferentially. The advantage here is that simple manufacturing can be achieved, and axial impacts do not significantly affect the angle determination.
[0030] In an advantageous design, the rigidity of the support plate is less in the axial direction than in the circumferential direction and / or in the radial direction. The advantage here is that the angular state can be accurately determined even in the case of axial impacts.
[0031] In an advantageous design, the second side wall is arranged on the side of the adapter that is axially remote from the stator housing and / or the bearing cover. The advantage here is that the second angle sensor is directly connected to the second side wall and is thus stably and rigidly connected. However, the first angle sensor is carried by the rotor and is only connected to the first side wall of the adapter through the support plate, which is especially a torque transmitting member, as a torque support.
[0032] In an advantageous design, the first side wall is implemented as a perforated plate, and the second side wall is also implemented as a perforated plate. The advantage here is that simple manufacturing can be achieved. In addition, the rotor shaft passes through the holes in the first side wall, and the solid shaft of the second angle sensor passes through the holes in the second side wall.
[0033] In an advantageous design, strain gauges are fixed at the tabs, especially for monitoring whether the torque of the adapter exceeds the permitted deviation from zero. The advantage here is that in the case of excessive torque, the angular states determined by the two angle sensors deviate from each other, although the true angular state does not deviate. Therefore, higher reliability is achieved by monitoring non-permissible high torques.
[0034] Further advantages are given by the dependent claims. The invention is not limited to the feature combinations of the claims. For a person skilled in the art, especially for the purposes set forth and / or for the purposes arising from a comparison with the prior art, other reasonable combination possibilities of the claims and / or the features of the individual claims and / or the features of the description and / or the features of the drawings can be obtained. Description of the Drawings
[0035] The present invention will now be further described with the aid of schematic drawings, in which:
[0036] Figure 1 FIG. shows a sectional view of a region of an electric machine according to the invention, schematically in side view.
[0037] Figure 2 FIG. shows said region in perspective view.
[0038] Figure 3 FIG. shows the coupling device 6 of the electric machine in perspective view.
[0039] Figure 4 FIG. shows the solid shaft encoder 5 of the electric machine in perspective view.
[0040] Figure 5 FIG. shows the hollow shaft encoder 7 of the electric machine in perspective view.
[0041] Figure 6 FIG. shows the adapter of the electric machine in perspective view.
[0042] Figure 7 FIG. shows the bearing cover 1 of the electric machine in perspective view.
[0043] List of reference numerals:
[0044] 1 Bearing cover
[0045] 2 Double-wall adapter
[0046] 3 Tab
[0047] 4 Side wall
[0048] 5 Solid shaft encoder
[0049] 6 Coupling device
[0050] 7 Hollow shaft encoder
[0051] 8 Rotor shaft
[0052] 9 Stator housing
[0053] 60 Support plate Detailed description
[0054] As shown in the drawings, the electric machine has a rotor shaft 8, which is rotatably supported by bearings received in the bearing cover 1.
[0055] The bearing cover 1 is connected to the stator housing 9, which is connected to a bearing flange (not shown in the drawings), which receives another bearing for rotatably supporting the rotor shaft 9.
[0056] The stator housing surrounds the stator winding of the electric motor.
[0057] In order to reliably detect the angular position, the electric motor has two angle sensors. The first angle sensor of the two angle sensors is implemented as a hollow shaft encoder 7, and the second angle sensor of the two angle sensors is implemented as a solid shaft encoder 5.
[0058] The two angle sensors are arranged to detect the rotational position of the rotor shaft 8.
[0059] The angle value of the rotor shaft 8 detected by the angle sensor is fed to a converter, which supplies power to the electric motor according to the signal, so that a set value is achieved, for example, the torque provided by the rotor shaft 8, the rotational speed of the rotor shaft 8 or the rotational speed of the rotor shaft 8.
[0060] The hollow shaft of the hollow shaft encoder 7 is sleeved on the rotor shaft 8 or a shaft extension that is non-rotatably connected to the rotor shaft 8, and is non-rotatably connected to the rotating part of the shaft extension. In order to support the torque of the fixed part of the hollow shaft encoder 7, the fixed part is connected to the adapter 2, in particular to the first side wall of the adapter 2, by means of a support plate 60.
[0061] The first side wall of the adapter 2 is threadedly connected to the bearing cover 1 in such a way that an axially directed threaded member passes through the first side wall of the bearing cover and extends into the axially directed threaded hole of the bearing cover 1.
[0062] The first side wall of the adapter 2 is implemented in a perforated plate shape and is connected to the second side wall 4 by tabs 3 that extend in the axial direction and are spaced apart from each other in the circumferential direction. The second side wall 4 is preferably also implemented in a perforated plate shape.
[0063] The rotor shaft 8 passes through the hole in the first side wall.
[0064] The fixed part of the solid shaft encoder 5 is fixed at the second side wall 4, and the solid shaft of the solid shaft encoder passes through the hole in the second side wall 4.
[0065] The coupling device 6 connects the solid shaft to the rotor shaft 8.
[0066] The coupling device 6 is arranged axially between the hollow shaft encoder 7 and the solid shaft encoder 5.
[0067] The signals of the two encoders are compared with each other, and an unacceptable excessive deviation between the two signals is monitored. Thereby, the reliability is improved due to redundant angle determination.
[0068] The area covered axially by the tabs 3 includes the area covered axially by the coupling device 6.
Claims
1. A motor having a first angle sensor, The first angle sensor has: a first fixed part, in particular an encoder stator; and a first rotatable part, in particular an encoder rotor, which is rotatably supported, The rotor shaft of the motor is non-rotatably connected to the first rotatable part of the first angle sensor, in particular the encoder rotor, Characterized in that, The second angle sensor has: a second fixed part, in particular an encoder stator; and a second rotatable part, in particular an encoder rotor, which is rotatably supported, The rotor shaft of the motor is non-rotatably connected to the second rotatable part of the second angle sensor, in particular the encoder rotor, by means of an intermediate coupling device.
2. The motor according to claim 1, wherein, The first angle sensor is a hollow shaft encoder, and / or the second angle sensor is a solid shaft encoder.
3. The motor according to any one of the above claims, characterized in that, The first fixed part of the first angle sensor, in particular the encoder stator, is connected to the first side wall of the adapter by means of, in particular only by means of, a support plate, in particular for transmitting torque, The second fixed part of the second angle sensor, in particular the encoder stator, is connected to the second side wall of the adapter, in particular screwed to the second side wall of the adapter by means of a threaded member, in particular for transmitting torque, The first side wall and the second side wall are connected by means of a tab of the adapter, In particular, the tabs are all arranged at the same radial distance.
4. The electric machine according to any one of the above claims, characterized in that, The tabs are spaced apart from each other in the circumferential direction, in particular evenly spaced apart.
5. The electric machine according to any one of the above claims, characterized in that, Each of the tabs extends more in the circumferential direction than in the radial direction, and / or the radial wall thickness of the tab is correspondingly smaller than the dimension of the extension in the circumferential direction, The first side wall and the second side wall are spaced apart in the axial direction.
6. The electric machine according to any one of the preceding claims, characterized in that The first angle sensor and the second angle sensor are spaced apart in the axial direction, In particular, the axial direction is parallel to the axis of rotation of the rotor shaft of the motor. In particular, the circumferential direction and the radial direction are respectively based on the axis of rotation.
7. The electric machine according to any one of the preceding claims, characterized in that, The solid shaft of the second angle sensor passes through the second side wall.
8. The electric machine according to any one of the above claims, characterized in that, The area covered by the tab in the axial direction includes, in particular completely encloses, the area covered by the coupling device in the axial direction. In particular, the coupling device is axially spaced apart from both the first side wall and the second side wall.
9. The electric machine according to any one of the above claims, characterized in that The first side wall is fixed to the bearing cover of the motor, and the bearing cover houses a bearing for rotatably supporting the rotor shaft of the motor.
10. The electric machine according to any one of the above claims, characterized in that, The stator housing is axially arranged between the bearing cover and the bearing flange. The bearing flange houses another bearing of the rotor shaft. The stator housing is connected to the bearing cover and connected to the bearing flange.
11. The electric machine according to any one of the preceding claims, characterized in that, The support plate is designed to be curved, in particular multi-curved, In particular, a bend is formed in the radial direction, but in particular not in the circumferential direction.
12. The electric machine according to any one of the above claims, characterized in that, The rigidity of the support plate is smaller in the axial direction than in the circumferential direction and / or in the radial direction.
13. The electric machine according to any one of the above claims, characterized in that, The second side wall is arranged on a side of the adapter that is axially away from the stator housing and / or away from the bearing cover.
14. The electric machine according to any one of the above claims, characterized in that, The first side wall is implemented as a perforated plate, and the second side wall is implemented as a perforated plate.
15. The electric machine according to any one of the above claims, characterized in that, Strain gauges are fixed to the tabs, in particular for monitoring whether the torque of the adapter exceeds an allowable deviation from zero.