Motor rotating shaft and motor

Abstract

The motor rotating shaft and the motor are provided by the embodiment of the application, the motor rotating shaft comprises a first main body part and a second main body part, the second main body part is made of soft magnetic material, comprises a connecting part and a rotor part, the diameter of the rotor part is greater than the diameter of the connecting part, the connecting part is connected with the first main body part, and the rotor part is used for being processed to have a preset number of magnetic poles. Through the design, the processing difficulty of the rotor part can be reduced, the number of magnetic poles of the rotor part can be processed according to the use requirement, and therefore the versatility of the motor rotating shaft can be improved.

Description

Technical Field

[0001] This application relates to the automotive field, and particularly to a motor shaft and a motor. Background Technology

[0002] With the development of technology, automobiles have become a common means of transportation. Automobiles contain motors, and the motor shaft typically houses a resolver rotor. This resolver rotor, made of permanent magnet material, is fitted onto the motor shaft. The manufacturing of resolver rotors requires the creation of corresponding molds based on usage requirements. When the electromagnetic scheme of the motor changes, new molds need to be created to manufacture resolver rotors with the appropriate structure, resulting in high manufacturing costs and poor versatility. Utility Model Content

[0003] This application provides a motor shaft and a motor to reduce the processing cost of resolver rotors and improve the versatility of motor shafts.

[0004] This application provides a motor shaft, the motor shaft comprising: First main body section; The second main body is connected to the first main body; The second main body is made of soft magnetic material and has a connecting part and a rotor part that are connected to each other. Along the radial direction of the motor shaft, the diameter of the rotor part is larger than the diameter of the connecting part. The connecting part is connected to the first main body and the rotor part is used to be processed into a rotary rotor with a predetermined number of magnetic poles.

[0005] In one possible implementation, the diameter of the rotor portion is 20 mm to 64 mm, and / or, along the axial direction of the motor shaft, the size of the rotor portion is 4 mm to 12 mm.

[0006] In one possible implementation, the connecting portion includes a first connecting portion and a second connecting portion along the axial direction of the motor shaft. The first connecting portion and the second connecting portion are located on opposite sides of the rotor portion. The first connecting portion is used to connect with the first main body portion, and the second connecting portion is used to connect with the object to be connected.

[0007] In one possible implementation, the first main body portion is provided with a recessed portion, the recessed portion being recessed in a direction away from the second main body portion, and at least a portion of the first connecting portion extends into the recessed portion.

[0008] In one possible implementation, a guide portion is provided at the end of the first connecting portion away from the rotor portion, and the diameter of the guide portion gradually decreases along the direction away from the rotor portion.

[0009] In one possible implementation, the first connecting portion is interference-fitted with the recessed portion.

[0010] In one possible implementation, the second main body portion has a limiting portion located between the rotor portion and the first connecting portion, the diameter of the limiting portion being larger than the diameter of the first connecting portion and smaller than the diameter of the rotor portion.

[0011] In one possible implementation, the size of the limiting portion along the axial direction of the motor shaft is 0.5 mm to 5 mm, and / or; Along the radial direction of the motor shaft, the diameter of the first connecting part is m, the diameter of the limiting part is n, and 3 mm ≤ nm ≤ 6 mm.

[0012] In one possible implementation, the first connecting portion is 5 mm to 14 mm in size along the axial direction of the motor shaft, and / or the second connecting portion is 5 mm to 20 mm in size.

[0013] This application also provides a motor, which includes a motor shaft, and the motor shaft is any of the motor shafts described above.

[0014] This application provides a motor shaft and a motor. The motor shaft includes a first main body and a second main body. The second main body is made of soft magnetic material and includes a connecting part and a rotor part. The diameter of the rotor part is larger than the diameter of the connecting part. The connecting part is connected to the first main body. The rotor part is used to be machined with a preset number of magnetic poles. This design reduces the machining difficulty of the rotor part, and the number of magnetic poles in the rotor part can be machined according to usage requirements, thereby improving the versatility of the motor shaft. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the motor shaft provided in an embodiment of this application; Figure 2 A schematic diagram of the second main body provided in an embodiment of this application; Figure 3 A schematic diagram of the second main body provided in an embodiment of this application from another perspective; Figure 4 A cross-sectional view of the second main body provided in an embodiment of this application; Figure 5 A cross-sectional view of the first main body provided in an embodiment of this application; Figure 6 This is a partial cross-sectional view of the motor shaft provided in an embodiment of this application; Figure 7 A schematic diagram from another perspective of the second main body provided in an embodiment of this application; Figure 8 A schematic diagram of the second main body provided in an embodiment of this application; Figure 9 This is a schematic diagram of the second main body portion after processing magnetic poles, provided in an embodiment of this application. Figure 10 for Figure 9 A diagram from another perspective; Figure 11 This is a schematic diagram of a motor shaft with a resolver rotor provided in an embodiment of this application; Figure Labels 1-First main body section; 11-Depression; 2-Second main body section; 21-Connecting part; 211-First connecting part; 211a - Guide section; 212 - Second connecting part; 22-Rotor section; 23-Limiting part. Detailed Implementation

[0016] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0017] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0018] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0019] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0020] The motor shaft is typically equipped with a resolver rotor, also known as a rotary transformer rotor. When the shaft rotates, the resolver rotor rotates with the shaft and generates an induced signal due to electromagnetic induction. The signal generated by the resolver rotor can be used to obtain information such as the rotation angle and speed of the shaft. Usually, the resolver rotor has a permanent magnet structure. When the motor design changes, the resolver rotor needs to be re-molded, which increases the processing cost.

[0021] Therefore, embodiments of this application provide a motor shaft and a motor to reduce the processing cost of resolver rotors and improve the versatility of motor shafts.

[0022] like Figure 1 As shown, this application embodiment provides a motor shaft, which includes a first main body portion 1 and a second main body portion 2 connected to each other. The second main body portion 2 is made of a soft magnetic material, such as... Figure 2 and Figure 3 As shown, the second main body 2 has a connecting part 21 and a rotor part 22 that are connected to each other. Along the radial direction of the motor shaft, the diameter of the rotor part 22 is larger than the diameter of the connecting part 21. The second main body 2 is connected to the first main body 1 via the connecting part 21. The rotor part 22 is used to be processed into a resolver rotor having a predetermined number of magnetic poles. During processing, a predetermined number of magnetic poles are processed according to the usage requirements.

[0023] In the solution provided in this application embodiment, the second main body 2 is made of soft magnetic materials such as silicon steel. The rotor part 22 of the second main body 2 is a general structure. During use, the rotor part 22 can be processed according to the usage requirements to obtain a rotary rotor with a corresponding structure.

[0024] Soft magnetic materials are relatively easy to process. The rotor section 22 can be machined by turning, milling, boring, etc. When using a motor shaft, the rotor section 22 can be machined to produce the appropriate number of magnetic poles according to the processing requirements. This design can reduce the processing cost of the rotor section 22, eliminating the need for separate molds for different usage requirements. It can be produced uniformly using a single mold, and the rotor section 22 can be further processed using other more conventional processing equipment to obtain a rotor with the corresponding structure.

[0025] By adopting the solution provided in this application embodiment, the processed resolver rotor can be integrally formed on the second main body 2. This design helps reduce the installation error of the resolver rotor, improves the positional accuracy of the resolver rotor, and thus improves the detection accuracy of the resolver rotor. The integrally formed structure can improve the connection reliability of the resolver rotor, which is beneficial to improving the rotor rotor's impact resistance, vibration resistance, and other performance. Moreover, the integrally formed structure is less affected by external factors. When the temperature of the motor shaft changes, the integrally formed structure can reduce the possibility of gaps appearing at the connection position of the rotor part 22 due to thermal expansion and contraction. After the rotor part 22 is processed into a resolver rotor, the installation stability of the resolver rotor can be improved, which is beneficial to improving the detection accuracy of the resolver rotor and is more in line with actual use requirements.

[0026] The first main body 1 and the second main body 2 can be made of different materials. The first main body 1 can be made of alloy steel, while the second main body 2 can be made of soft magnetic material, typically a soft magnetic alloy. Using alloy steel for the first main body 1 can improve the structural strength of the motor shaft, giving it higher rigidity and load-bearing capacity. Using soft magnetic material for the second main body 2 is easier to process, allowing users to machine it themselves along with the rotor 22 according to their needs, thus reducing processing difficulty.

[0027] like Figure 4 As shown, in one possible embodiment, the diameter of the rotor portion 22 is a, and a is from 25 mm to 64 mm, and / or, along the axial direction of the motor shaft, the size of the rotor portion 22 is b, and b is from 4 mm to 12 mm.

[0028] The diameter of the rotor section 22 can be 25 mm, 27 mm, 29 mm, 31 mm, 33 mm, 35 mm, 37 mm, 39 mm, 41 mm, 43 mm, 45 mm, 47 mm, 49 mm, 51 mm, 53 mm, 55 mm, 57 mm, 59 mm, 61 mm, 63 mm, 64 mm, etc. The axial dimension of the rotor section 22 along the motor shaft can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, etc.

[0029] When the diameter of the rotor section 22 is too small, the size of the rotor section 22 is small, resulting in a small resolver rotor, and the machining process is more difficult. When the diameter of the rotor section 22 is too large, the volume of the rotor section 22 is too large, requiring more material to be removed during the machining of the resolver rotor, leading to reduced machining efficiency and material waste. Therefore, by setting the diameter of the rotor section 22 to 20 mm to 64 mm, it is possible to meet the machining requirements of different sizes while reducing material waste and machining difficulty, thus better meeting practical application needs.

[0030] like Figure 4 As shown, in one possible implementation, the connecting portion 21 includes a first connecting portion 211 and a second connecting portion 212. Along the axial direction of the motor shaft, the first connecting portion 211 and the second connecting portion 212 are located on opposite sides of the rotor portion 22. The first connecting portion 211 is used to connect to the first main body portion 1, and the second main body portion 2 is used to connect to the object to be connected. The object to be connected may be the rotor inside an oil pump, etc.

[0031] This design facilitates the connection of the second main body 2 to the first main body 1 and the object to be connected.

[0032] like Figure 5 As shown, in one possible embodiment, the first main body portion 1 has a recessed portion 11, which is recessed in a direction away from the second main body portion 2, such as... Figure 6 As shown, at least a portion of the first connecting portion 211 extends into the recessed portion 11.

[0033] This design allows the first main body 1 to be fitted onto the second main body 2, thereby increasing the contact area between the two main body parts and improving the stability of their connection. The first connecting part 211 extending into the recessed part 11 allows the first main body 1 to contact the first connecting part 211 circumferentially. This not only improves connection stability but also limits the relative position of the first main body 1 and the second main body 2, improving the relative positional accuracy between them and better meeting practical usage requirements.

[0034] In one possible implementation, the first connecting portion 211 is press-fitted with the recessed portion 11.

[0035] Interference fit offers high connection reliability and strong resistance to loosening. Furthermore, no additional connecting parts or fasteners are required between the first main body 1 and the second main body 2. Simultaneously, the interference fit can stably transmit loads, torque, and axial forces. Moreover, the interference fit between the first main body 1 and the second main body 2 improves their coaxiality, and the relative positions of the first main body 1 and the second main body 2 are fixed after installation. This reduces the possibility of positional misalignment between the first main body 1 and the second main body 2 due to factors such as vibration and temperature changes, thereby improving the relative positional accuracy of the first main body 1 and the second main body 2 and the stability of the connection.

[0036] like Figure 2 As shown, in one possible implementation, a guide portion 211a is provided at the end of the first connecting portion 211 away from the rotor portion 22, and the diameter of the guide portion 211a gradually decreases along the direction away from the rotor portion 22.

[0037] The end of the first connecting part 211 away from the rotor part 22 can be formed into a slope, arc surface or other structure. During installation, the first connecting part 211 can be guided by the guide part 211a. Since the first connecting part 211 gradually decreases in the direction away from the rotor part 22, the diameter of the end of the first connecting part 211 facing the first main body part 1 is relatively small. It is more convenient to insert the first connecting part 211 into the recess 11, thereby reducing the connection difficulty between the first main body part 1 and the second main body part 2, which is more in line with the actual use requirements.

[0038] like Figure 6 As shown, in one possible embodiment, the second main body 2 has a limiting portion 23 located between the rotor portion 22 and the first connecting portion 211. Figure 7 As shown, the diameter of the limiting part 23 is larger than the diameter of the first connecting part 211, and the diameter of the limiting part 23 is smaller than the diameter of the rotor part 22.

[0039] By setting a limiting part 23 with a diameter larger than that of the first connecting part 211, the relative position between the first main body part 1 and the second main body part 2 can be restricted when connecting the first main body part 1 and the second main body part 2, thereby improving the fitting accuracy between the first main body part 1 and the second main body part 2. The diameter of the limiting part 23 is smaller than that of the rotor part 22, which reduces the influence of the limiting part 23 on the rotor part 22. When machining the rotor part 22 to form magnetic poles, it is necessary to cut or otherwise process parts of the rotor part 22 to remove some of its structure. When the diameter of the limiting part 23 is too large, it is easy to interfere with the parts of the rotor part 22 that need to be removed, increasing the machining difficulty of the rotor part 22 and affecting its structure.

[0040] like Figure 8 As shown, in one possible implementation, the dimension of the limiting portion 23 along the axial direction of the motor shaft is c, and c is from 0.5 mm to 5 mm, and / or, as shown... Figure 4 As shown, along the radial direction of the motor shaft, the diameter of the first connecting portion 211 is m, and the diameter of the limiting portion 23 is n, where 3 mm ≤ nm ≤ 6 mm. The difference between the diameter of the first connecting portion 211 and the diameter of the limiting portion 23 can be 3.0 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5.0 mm, etc. Along the radial direction of the motor shaft, the dimension by which the limiting portion 23 protrudes on one side relative to the first connecting portion 211 is d, where 1.5 mm ≤ d ≤ 3.0 mm.

[0041] With this design, the positions of the first main body 1 and the second main body 2 can be limited by the limiting part 23. The limiting part 23 can abut against the first main body 1 along the radial direction of the motor shaft, thereby limiting the first connecting part 211 from continuing to extend into the recess 11, thereby limiting the relative position of the first main body 1 and the second tracking part.

[0042] When the axial dimension of the limiting part 23 along the motor shaft is too small, the limiting effect of the limiting part 23 is poor. When the axial dimension of the limiting part 23 along the motor shaft is too large, it will cause the dimension of the second main body 2 along the motor shaft to increase, the overall volume of the motor shaft will increase, and a large gap will be generated between the first main body 1 and the rotor 22, which will easily lead to the accumulation of dust, debris and other impurities in the gap, affecting the normal operation of the motor shaft. When the difference between the diameter of the limiting part 23 and the diameter of the first connecting part 211 is too small, it will cause the limiting ability of the limiting part 23 to decrease, resulting in a deviation in the relative position of the first main body 1 and the second main body 2. When the difference between the diameter of the limiting part 23 and the diameter of the first connecting part 211 is too large, it will cause the diameter of the limiting part 23 to be close to the diameter of the rotor 22. When the magnetic poles are processed in the rotor 22, the limiting part 23 will interfere with the processing, thus increasing the processing difficulty.

[0043] like Figure 8 As shown, in one possible embodiment, along the axial direction of the motor shaft, the first connecting portion 211 has a dimension of e, where e is 5 mm to 14 mm, and / or the second connecting portion 212 has a dimension of f, where f is 5 mm to 20 mm. The dimension of the first connecting portion 211 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, etc. The dimension of the second connecting portion 212 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0044] When the size of the first connecting part 211 is too small, the contact area between the first connecting part 211 and the first main body 1 is too small, which can easily lead to a decrease in the connection stability between the first main body 1 and the second main body 2. When the size of the first connecting part 211 is too large, the overall weight of the motor shaft increases, and the distance that the first connecting part 211 extends into the recess 11 during installation is too large, resulting in a decrease in installation efficiency. Moreover, since the first connecting part 211 and the recess 11 are in an interference fit, if the length of the first connecting part 211 is too large, it will increase the installation difficulty. When the size of the second connecting part 212 is too small, it will increase the difficulty of connecting the second connecting part 212 to the object to be installed, and it can easily lead to a decrease in the detection area between the second connecting part 212 and the object to be connected, resulting in a decrease in connection stability. When the size of the second connecting part 212 is too large, the overall size of the motor shaft increases, which can easily cause interference with other components.

[0045] Based on the motor shaft provided in the above embodiments, this application also provides a motor. The motor may include the motor shaft involved in any of the above embodiments. Since the motor shaft has the above technical effects, the motor including the motor shaft also has the corresponding technical effects, which will not be elaborated here.

[0046] In the solution provided in this application embodiment, by providing a rotor portion 22 made of soft magnetic alloy material in the second main body 2, the processing difficulty of the rotor portion 22 can be reduced, making it easier for users to process the rotor portion 22 into the corresponding rotor structure. Compared with permanent magnet materials, soft magnetic materials are easier to process, have more processing methods, and do not require special molds. When the motor design changes, the rotor portion 22 can be directly processed into the required structure without the need for re-molding. Therefore, the motor shaft provided in this application embodiment has good versatility and can be adapted to different motor designs. In use, the rotor portion 22 can usually be processed into a petal structure. Taking a resolver rotor that requires four magnetic poles as an example, the rotor portion 22 can be processed from... Figure 7 The structure shown is processed into 9 and 9 in the figure. Figure 10 The structure shown is as follows. The structure of the machined motor shaft is as follows. Figure 11 As shown. In practical applications, the rotor section 22 can be machined into different numbers of petal-shaped structures according to usage requirements. Usually, the number of petals corresponds to the number of magnetic poles. Soft magnetic alloys such as silicon steel are relatively easy to machine and have a variety of machining methods. Users can choose the appropriate machining method according to their own machining conditions, thereby making the application of the motor shaft more flexible.

Claims

1. A motor shaft, characterized in that, The motor shaft includes: First main body (1); The second main body part (2) is connected to the first main body part (1); The second main body (2) is made of soft magnetic material. The second main body (2) has a connecting part (21) and a rotor part (22) that are connected to each other. Along the radial direction of the motor shaft, the diameter of the rotor part (22) is larger than the diameter of the connecting part (21). The connecting part (21) is connected to the first main body (1). The rotor part (22) is used to be processed into a rotary rotor with a predetermined number of magnetic poles.

2. The motor shaft according to claim 1, characterized in that, The diameter of the rotor portion (22) is 20 mm to 64 mm, and / or, along the axial direction of the motor shaft, the size of the rotor portion (22) is 4 mm to 12 mm.

3. The motor shaft according to claim 1, characterized in that, The connecting part (21) includes a first connecting part (211) and a second connecting part (212). Along the axial direction of the motor shaft, the first connecting part (211) and the second connecting part (212) are located on opposite sides of the rotor part (22). The first connecting part (211) is used to connect with the first main body part (1), and the second connecting part (212) is used to connect to the object to be connected.

4. The motor shaft according to claim 3, characterized in that, The first main body (1) is provided with a recessed portion (11), the recessed portion (11) is recessed in a direction away from the second main body (2), and at least a portion of the first connecting portion (211) extends into the recessed portion (11).

5. The motor shaft according to claim 4, characterized in that, The first connecting part (211) has a guide part (211a) at one end away from the rotor part (22), and the diameter of the guide part (211a) gradually decreases along the direction away from the rotor part (22).

6. The motor shaft according to claim 4, characterized in that, The first connecting part (211) is in an interference fit with the recessed part (11).

7. The motor shaft according to claim 4, characterized in that, The second main body (2) has a limiting part (23) located between the rotor part (22) and the first connecting part (211). The diameter of the limiting part (23) is greater than the diameter of the first connecting part (211), and the diameter of the limiting part (23) is smaller than the diameter of the rotor part (22).

8. The motor shaft according to claim 7, characterized in that, Along the axial direction of the motor shaft, the size of the limiting portion (23) is 0.5 mm to 5 mm, and / or; Along the radial direction of the motor shaft, the diameter of the first connecting part (211) is m, the diameter of the limiting part (23) is n, and 3 mm ≤ nm ≤ 6 mm.

9. The motor shaft according to claim 3, characterized in that, Along the axial direction of the motor shaft, the first connecting portion (211) has a size of 5 mm to 14 mm, and / or the second connecting portion (212) has a size of 5 mm to 20 mm.

10. An electric motor, characterized in that, The motor includes a motor shaft, which is the motor shaft according to any one of claims 1 to 9.

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