Motor rotation angle detection device
By arranging equally spaced protrusions on the surface of the motor's rotating shaft to cooperate with the detection component in the circuit design, the problem of inaccurate self-rotation angle detection after the motor stops being powered on is solved, achieving accurate detection of the motor's rotation angle and improving system stability.
Patent Information
- Application Number
- CN202423068946.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing rotation angle detection devices cannot accurately measure the self-rotation angle of the shaft after the motor stops being powered, resulting in position deviation when the motor restarts, affecting the system control accuracy and stability.
A motor rotation angle detection device was designed. The device arranges the components to be detected on the surface of the rotating shaft, uses equally spaced protrusions to cooperate with the detection components, configures a detection circuit, captures the change in electrical signal when the protrusions pass by, and calculates the rotation angle.
It enables precise detection of the motor rotation angle, simplifies the structure, improves installation and maintenance convenience, and enhances the accuracy and reliability of detection.
Smart Images
Figure CN223460987U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor field, concretely is a motor rotation angle detection device. BACKGROUND
[0002] With the continuous development of industrial automation, electric motor plays a vital role in various mechanical equipment, such as wind power, industrial robot, precision machining equipment, etc., the existing rotation angle detection device often cannot accurately measure the self-rotation angle of the rotating shaft after the motor stops energizing. This self-rotation may be caused by mechanical inertia, external torque and other factors. If the self-rotation angle cannot be accurately detected, it may cause the electric motor to have position deviation when restarting, and thus affect the control accuracy and stability of the whole system. SUMMARY
[0003] The utility model discloses a motor rotation angle detection device to solve the problems in the above background.
[0004] To achieve the above object, the utility model provides the following technical scheme:
[0005] A motor rotation angle detection device, the motor includes a rotating shaft, and the detection device includes:
[0006] A detected component is arranged on the surface of the rotating shaft, the detected component rotates as a whole with the rotating shaft, and the detected component also has a detected surface for detecting the rotation angle;
[0007] A detection component is arranged corresponding to the detected surface;
[0008] The detected component includes a first surface arranged in a ring shape, a plurality of protruding portions are arranged in a circumferential direction around the rotating shaft on the side surface of the first surface close to the detection component, all the protruding portions are arranged at equal intervals, and the detection component is configured to detect the number of protruding portions passing through the corresponding detection area of the detection component.
[0009] Preferably, the motor further includes a housing, a stator assembly and a rotor assembly are arranged inside the housing, and the detected component and the detection component are arranged in the external region of the housing.
[0010] Preferably, the detected component includes:
[0011] A first rotating member is arranged on one side surface of the first rotating member;
[0012] A connecting component is arranged in a sheet shape;
[0013] A second rotating member is the same as the first rotating member;
[0014] The first rotating part and the second rotating part are both made of ferromagnetic material, the connecting member is a magnet, the mounting area is provided with a limiting column, and the connecting member is provided with a limiting groove corresponding to the limiting column.
[0015] Preferably, the detection member comprises:
[0016] Two shell members, the two shells are respectively arranged corresponding to the first rotating body and the second rotating body, and the shell member comprises a first cavity, and an opening is formed on the surface of the first cavity;
[0017] A first conductive member is arranged in the first cavity;
[0018] A second conductive member is arranged corresponding to the position of the first conductive member, one end of the second conductive member extends to the outside of the first cavity and is located at the position of the convex part;
[0019] A power supply member is arranged in the first cavity;
[0020] The first conductive member, the second conductive member and the power supply member are electrically connected to form a first circuit, and the voltage detection member detects the voltage of the first circuit.
[0021] Preferably, the second conductive member comprises:
[0022] A support member is arranged in the first cavity, and one end of the support member is connected to the inner wall of the first cavity;
[0023] A conductive elastic member is fixed to one end of the support member and extends to the outside of the first cavity;
[0024] A contact point member is arranged on the side of the conductive elastic member close to the first conductive member.
[0025] Compared with the prior art, the electric motor rotation angle detection device has the advantages that:
[0026] The utility model discloses a motor rotation angle detection device, its structure includes detected member and detection member, and the detected member is closely combined with the rotation shaft of motor, forms integral rotation, and the detected member has a annular first surface, and this surface takes rotation shaft as the center, and equal interval has arranged a plurality of convex parts. When the motor works, these convex parts will rotate along with rotation shaft, and the detection member is arranged corresponding with the convex part of detected member, and the inside is configured detection circuit. When the convex part rotates through the detection area of detection member, will cause the change of the electric signal output of detection circuit. The change of electric signal is accurately captured by detection member, and is converted into the information reflecting rotation angle. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1Figure 1 is a schematic diagram of a motor and a detection device connected in an embodiment.
[0028] Figure 2 Figure 2 is a schematic diagram of an appearance of a detection device in an embodiment.
[0029] Figure 3 Figure 3 is a front view of a detection device in an embodiment.
[0030] Figure 4 Figure 4 is a schematic diagram of a structure of a first rotating member in an embodiment.
[0031] Figure 5 Figure 5 is a schematic diagram of a state of a detection member in an embodiment.
[0032] Figure 6 Figure 6 is a schematic diagram of a state of a detection member in an embodiment. Figure 5 DETAILED DESCRIPTION
[0033] The technical solutions of the patent will be further described in detail below with reference to specific embodiments.
[0034] The embodiments of the patent will be described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the patent, and cannot be understood as a limitation of the patent.
[0035] In the description of the patent, it should be understood that the orientations or positional relationships indicated by the terms “middle”, “bottom”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “two sides” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the patent and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the patent.
[0036] In the description of the patent, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “assembly” should be understood broadly, for example, it can be fixedly connected, arranged, or detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meanings of the above terms in the patent can be understood according to the specific circumstances.
[0037] Reference should be made to Figures 1-2 The embodiment discloses a motor rotation angle detection device, the motor comprises a rotating shaft 1, the detection device comprises a detected component 2, the rotating shaft 1 is arranged with the detected component 2 on the surface, the detected component 2 rotates integrally with the rotating shaft 1, and the detected component also has a detected surface for detecting a rotation angle; the detection component 3 is arranged correspondingly to the detected surface; wherein the detected component comprises a first surface arranged in a ring shape, a plurality of convex portions are arranged in a circle around the rotating shaft 1 on one side surface of the detection component 3 close to the first surface, all the convex portions are arranged at equal intervals, and the detection component 3 is configured to detect the number of the convex portions passing through the detection area corresponding to the detection component 3.
[0038] Please refer to Figure 1 In the above embodiment, A is the position of the detection device, B is the position of the motor, the detection device is arranged at the end of the motor, the detected component 2 comprises a first surface arranged in a ring shape, a plurality of convex portions are arranged in a circle around the rotating shaft 1 on one side surface of the detection component 3 close to the first surface. The convex portions are arranged at equal intervals, forming a specific space structure, when the motor rotates, the detected component 2 rotates, and the convex portions pass through the detection area corresponding to the detection component 3 in turn. By detecting the number and position changes of the convex portions, the rotation angle of the motor can be accurately calculated, the detection component 3 is internally provided with a corresponding detection circuit, when the convex portion passes through the detection area, the change of the electric signal output by the detection circuit is caused, the value of the electric signal is captured, and the rotation angle can be calculated through the regular change of the electric signal. For example, in the embodiment, the convex portions on the first surface of the detected component 2 are arranged at equal intervals, and the number is selected as 120. The included angle between adjacent convex portions and the rotating shaft 1 is fixed, and the included angle is calculated as 3°. When the motor rotates, each convex portion passes through the detection area in turn, and the detection circuit in the detection component 3 can capture the passing event and output a corresponding electric signal. The detection component 3 can accurately capture the change of the electric signal caused by the passing of the convex portion. The regularity of the electric signal change is directly related to the passing order and number of the convex portion. By capturing and analyzing the electric signal, the number of the passing convex portion can be accurately determined, and the rotation angle of the motor can be calculated. For example, at a certain moment, 38 regular groups (each group represents the event that a convex portion passes through the detection area) are recognized through the detection of the electric signal, and the rotation angle of the motor is the sum of the angles corresponding to the 38 groups of convex portions, that is, 38*3° = 114°.
[0039] Please continue to refer to Figure 1In an embodiment, the motor further comprises a housing, the stator assembly and the rotor assembly are arranged inside the housing, the detected member 2 and the detection member 3 are arranged in the external region of the housing, the additional detection device is avoided in the complex and compact space inside the motor, the overall structure is simplified, and the assembly difficulty is reduced. Secondly, since the detected member 2 and the detection member 3 are located outside the housing, it is easier to access and operate during installation, debugging and subsequent maintenance, greatly improving the convenience.
[0040] Please refer to Figure 3 and Figure 4 In an embodiment, the detected member 2 comprises a first rotating member 21, one side surface of the first rotating member 21 is provided with a mounting area; the connecting member 22 is arranged in a sheet shape; the first rotating member 21 and the second rotating member 22 are the same; wherein the first rotating member 21 and the second rotating member 23 are both ferromagnetic materials, the connecting member 22 is a magnet, the mounting area is provided with a limiting column, and the connecting member 22 is provided with a limiting groove corresponding to the limiting column. Please continue to refer to Figure 4 The C position is a limiting groove.
[0041] Specifically, when the motor starts to rotate, the rotating shaft 1 drives the detected member 2 to rotate together, and the first rotating member 21 and the second rotating member 23 realize synchronous rotation through the connecting member 22. The relevant rotation information (such as the number of passing protrusions) is captured by the detection member 3 and converted into an electrical signal. Since the first rotating member 21 and the second rotating member 23 are the same in structure and function, and they are synchronous rotation, the detection accuracy can be checked by detecting the two rotating members. Specifically, if the rotation information transmitted by the first rotating member 21 and the second rotating member 23 to the detection member 3 is consistent (that is, the change of the electrical signal caused by them is synchronous and consistent), it can be considered that the detection result is accurate. On the contrary, if there is a difference, it may mean that there is an error or fault in the detection process, which needs to be further checked and adjusted. In the above embodiment, the connecting member 22 adopts a magnet design, which can be easily separated from the first rotating member 21, the connecting member 22 and the second rotating member 23 when disassembled for maintenance, simplifying the disassembly process and avoiding damage or deformation during disassembly.
[0042] Please refer to Figure 5 and Figure 6In an embodiment, the detection component 3 comprises two shell components 31, each corresponding to the first rotating body 21 and the second rotating body 23, the shell component 31 comprises a first cavity, the first cavity is provided with an opening on the surface; the first conductive component 32 is arranged inside the first cavity; the second conductive component 33 is arranged in a position corresponding to the position of the first conductive component 32, one end of the second conductive component 33 extends to the outside of the first cavity and is located at the position of the protruding part; the power supply component 34 is arranged inside the first cavity; wherein the first conductive component 32, the second conductive component 33 and the power supply component 34 are electrically connected to form a first circuit, and the voltage detection component 35 detects the voltage of the first circuit.
[0043] In the above embodiment, one end of the second conductive component 33 extends to the outside of the first cavity and is located at the position of the protruding part, when the protruding part rotates with the rotating body, it can periodically contact the first conductive component 32, thereby changing the on-off state of the circuit, the power supply component 34 is also arranged inside the first cavity, which provides stable power supply for the entire detection circuit, when the protruding part contacts the first conductive component 32, the state of the first circuit will change, this change is captured by the voltage detection component 35, the voltage detection component 35 is used to monitor the voltage change of the first circuit in real time, in an embodiment, the 179 series of Fluke or the 34401A of Agilent is selected to monitor the voltage change, since the periodic contact of the protruding part will cause the on-off state of the first circuit to change, thereby causing the voltage to fluctuate. By capturing these voltage fluctuations, the voltage detection component 35 can accurately reflect the rotation angle of the rotating body, since two independent detection channels (corresponding to the first rotating body 21 and the second rotating body 23 respectively) are provided, double verification of the rotation angle can be realized, thereby improving the accuracy and reliability of the detection.
[0044] Further, the second conductive component 33 comprises a support arranged inside the first cavity, one end of the support is connected to the inner wall of the first cavity; one end of the conductive elastic member is fixed to the support and the other end of the conductive elastic member extends to the outside of the first cavity; the contact component is arranged on the side of the conductive elastic member close to the first conductive component 32.
[0045] Specifically, the support provides stable support and positioning, ensuring that the conductive elastic member and the contact member can be accurately arranged at a predetermined position, and when the protrusions are in contact with the conductive elastic member, the conductive elastic member is elastically deformed to form reliable contact with the protrusions, and after the protrusions are removed, the conductive elastic member returns to its original state. During the rotation of the motor, the protrusions rotate with the rotating body and periodically contact the second conductive member 33, and the second conductive member 33 is in contact with the first conductive member 31 through the contact under the action of the protrusions, thereby forming a closed circuit. Please refer to Figure 5 , which is the state when the protrusions are not in contact with the first conductive member 32, please refer to Figure 6 , which is the state when the protrusions are in contact with the first conductive member 32, the conductive elastic member is elastically deformed to form close contact between the contact member and the first conductive member 32. At this time, the current will flow to the first conductive member 32 through the contact member, the conductive elastic member and the support, thereby changing the state of the detection circuit.
[0046] In summary, the utility model discloses a motor rotation angle detection device, its structure includes the detected member 2 and detection member 3, the detected member 2 is closely combined with the rotating shaft 1 of motor, forms integral rotation, the detected member 2 has a annular first surface, this surface is with rotating shaft 1 as center, and equal interval is arranged multiple protrusions. When the motor works, these protrusions will rotate with rotating shaft 1, and the detection member 3 is arranged corresponding to the protrusions of the detected member 2, and the detection circuit is arranged in the inside. When the protrusions rotate through the detection area of detection member 3, the change of the electric signal output by the detection circuit is caused. The change of the electric signal is accurately captured by the detection member 3, and is converted into the information reflecting the rotation angle.
[0047] The above is only the preferred embodiment of the utility model, it should be pointed out that for the person skilled in the art, on the premise that without departing from the utility model concept, still can make several deformation and improvement, these also should be regarded as the protection range of the utility model, these will not affect the effect and the practicality of patent of the utility model implementation.
Claims
1. A motor rotation angle detecting device characterized by comprising: The motor comprises a rotating shaft, and the detection device comprises: a detected component, the rotating shaft is arranged with a detected component, the detected component rotates integrally with the rotating shaft, and the detected component also has a detected surface for detecting a rotating angle; a detection component, the detection component is arranged corresponding to the detected surface; wherein the detected component comprises a first surface arranged in a ring shape, a plurality of protruding portions are arranged in a circumferential direction around the rotating shaft near a side surface of the detection component, all the protruding portions are arranged at equal intervals, and the detection component is configured to detect the number of protruding portions passing through a detection area corresponding to the detection component.
2. The motor rotation angle detecting device according to claim 1, wherein The motor further comprises a shell, the shell is internally arranged with a stator assembly and a rotor assembly, and the detected component and the detection component are arranged in an external area of the shell.
3. The motor rotation angle detecting device according to claim 1, wherein The detected component comprises: a first rotating member, a mounting area is arranged on a side surface of the first rotating member; a connecting member, the connecting member is arranged in a sheet shape; a second rotating member, the first rotating member and the second rotating member are the same; wherein the first rotating member and the second rotating member are both ferromagnetic materials, the connecting member is a magnet, the mounting area is arranged with a limiting column, and the connecting member is arranged with a limiting groove corresponding to the limiting column.
4. The motor rotation angle detecting device according to claim 3, wherein The detection component comprises: a shell member, the shell member comprises a first cavity, and an opening is formed on a surface of the first cavity; a first conductive member, the first conductive member is arranged inside the first cavity; a second conductive member, the second conductive member is arranged corresponding to the position of the first conductive member, one end of the second conductive member extends to the outside of the first cavity, and is located at the position of the protruding portion; a power supply member, the power supply member is arranged inside the first cavity; wherein the first conductive member, the second conductive member and the power supply member are electrically connected to form a first circuit, and a voltage detection component detects the voltage of the first circuit.
5. The motor rotation angle detecting device according to claim 4, wherein The second conductive member comprises: a support member, the support member is arranged inside the first cavity, and one end of the support member is connected to an inner wall of the first cavity; a conductive elastic member, one end of the conductive elastic member is fixed to the support member, and the other end of the conductive elastic member extends to the outside of the first cavity; a contact point member, the contact point member is arranged in a region near the first conductive member on a side of the conductive elastic member.