A type of axial zero-sequence motor structure

Abstract

This utility model discloses an axial zero-sequence motor structure, belonging to the field of motor technology. The rear bearing cover of the motor includes a plate and an arc-shaped vertical plate. The center of the plate has a shaft hole for the motor shaft to pass through. At least two arc-shaped vertical plates are arranged in a equidistant ring around the shaft hole to radially enclose the motor bearing. The free end of the arc-shaped vertical plate away from the plate can be riveted and bent to form a pressure head for holding the bearing, and the pressure head is bent inward toward the shaft hole. Through the improved design of the rear bearing cover, this motor mechanism has fewer overall parts, a relatively simple manufacturing process, and lower cost. Furthermore, the motor tail has no protrusion, which can meet the needs of customers with space constraints.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology and provides a motor structure with zero axial series. Background Technology

[0002] Motors are generally classified into external rotor motors and internal rotor motors according to the relative positions of the rotor and stator. External rotor motors are gaining increasing attention due to their space-saving and compact design. An external rotor motor typically includes an annular rotor core, end caps attached to the outer surface of the rotor core, and a shaft fixed to the center of the end caps.

[0003] However, the structure of existing motor products, such as Figure 1 As shown in (a), the motor's bearing cover plate uses a structure containing bearings, gaskets, and springs, causing the rotor to move axially when subjected to axial force. Simultaneously, the motor's forward and reverse rotation is affected by the client's load, causing the rotor to reciprocate, resulting in a shift in the client's load position and insufficient accuracy. Furthermore, the rotor's reciprocating motion produces knocking noise, causing discomfort to the user. For example... Figure 1 As shown in (b), the motor's bearing cover uses a ball bearing and bearing sleeve connection method. Specifically, the rear cover and bearing sleeve are fixed by riveting, and the ball bearing is pressed into the bearing sleeve with an interference fit. The rotor shaft is then placed into the bearing hole. Next, the front cover is pressed into the ball bearing and placed into the rotor shaft. The finished product is fixed by riveting. The rotor's axial position is limited by the two ball bearings and cannot move. Although it has advantages such as no axial play and no protrusion at the motor tail, meeting the requirements of customers with space constraints, it also has other disadvantages: the rear cover and bearing sleeve are coupled together, and the bearing sleeve and ball bearing are coupled together, resulting in many parts, complex processes, difficulty in ensuring concentricity, the risk of rotor jamming, and high cost due to the large number of parts and processes. For example... Figure 1 As shown in (c), the motor's bearing cover uses a ball bearing and riveting connection method. Specifically, the rear cover and ball bearing are pressed together with an interference fit, and the rotor shaft is placed into the bearing hole. Then, the front cover is pressed into the ball bearing and placed into the rotor shaft. The finished product is fixed by riveting. The axial position of the rotor is also limited by two ball bearings and cannot move. Although it has advantages such as no axial play, fewer motor parts, simple manufacturing process, and low cost, it also has other disadvantages: the rear cover at the motor's tail end protrudes to accommodate the bearing, causing problems for customers with space constraints.

[0004] Therefore, the existing motor structure needs to be improved to reduce the number of parts, simplify the manufacturing process, reduce costs, and prevent the motor tail from protruding, while ensuring that there is no axial misalignment. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an efficient, space-friendly and low-cost axial zero-sequence motor structure to solve problems such as the large number of required parts and the protrusion at the motor tail.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses an axial zero-sequence motor structure. The rear bearing cover of the motor includes a plate and an arc-shaped vertical plate. The center of the plate has a shaft hole for the motor shaft to pass through. At least two arc-shaped vertical plates are arranged in a ring around the shaft hole at equal intervals to wrap the motor bearing in the radial direction. The free end of the arc-shaped vertical plate away from the plate can be bent by riveting to form a pressure head for holding the bearing, and the pressure head is bent inward toward the shaft hole.

[0008] By adopting the above scheme, the arc-shaped vertical plate design enhances the overall strength and rigidity of the structure, effectively withstanding various mechanical loads during motor operation. Furthermore, the arc-shaped vertical plate's surrounding bearing ring and the clamping action of the pressure head effectively maintain the bearing's stability, preventing displacement or friction during operation, thereby extending the motor's service life. In other words, the combined design of the arc-shaped vertical plate and the pressure head effectively restricts the bearing on the rear bearing cover, ensuring zero axial crosstalk during motor operation. This stable structural design significantly impacts the motor's accuracy and service life. Simultaneously, the rear bearing cover's overall design is compact, especially the integration of the plate surface and the arc-shaped vertical plate, eliminating any protrusion at the motor's tail end, meeting the needs of customers with space constraints. Overall, this motor, through its ingenious design of the connection structure between the rear bearing cover and the bearing, achieves advantages in axial zero crosstalk control, compact structure, fewer parts, and lower cost.

[0009] Optionally, the curved vertical plate is formed by mechanical stamping from the sheet material. This mechanical stamping process has a relatively high utilization rate of raw materials, and can form the curved vertical plate and pressure head for holding the bearing based on the sheet material, thereby effectively reducing parts and waste and lowering production costs.

[0010] Optionally, the curved uprights can be configured as four in an orthogonal cross arrangement. This offers the advantage of a compact design; the orthogonal cross layout maximizes support within a limited space, reduces the number of components, and optimizes the motor's size, making it suitable for space-constrained applications.

[0011] Optionally, the motor also includes a claw pole housing, a coil, a frame, an intermediate pole plate, a magnetic ring, a retainer, and a front bearing cover. The retainer is mounted on the shaft, and the magnetic ring is mounted outside the retainer to form the rotor assembly of the motor. The coil is mounted on the frame, the claw pole housing is mounted outside the frame, and the intermediate pole plate is mounted inside the frame and mounted outside the magnetic ring to form the stator assembly of the motor. The two ends of the shaft are rotatably connected to a rear bearing cover and a front bearing cover via a bearing, respectively.

[0012] Optionally, ball bearings are used. In motor design, ball bearings are responsible for limiting both axial and radial displacement of the shaft, ensuring the stability of the rotor assembly during operation. This is particularly important for achieving the goal of zero axial crosstalk.

[0013] Compared with the prior art, the present invention has one or more of the following advantages:

[0014] 1. This axial zero-crossing motor structure features axial zero-crossing control. By employing ball bearings and a specific structural design (such as orthogonally distributed arc-shaped vertical plates), the axial and radial displacement of the shaft is effectively limited, ensuring zero axial crossing during motor operation, thereby improving the motor's working accuracy and consistency.

[0015] 2. This axial zero-sequence motor structure features a compact design and saves space. The motor's design fully considers space constraints, especially with the absence of a protruding section at the rear, making it suitable for space-constrained applications. This characteristic allows the motor to achieve greater functionality within a smaller volume.

[0016] 3. This axial zero-sequence motor structure reduces the number of parts. By producing an arc-shaped vertical plate and pressure head structure for holding the bearing on the rear bearing cover plate surface, the number of motor parts is significantly reduced. For example, no additional bearing sleeve components are needed, which helps to simplify the assembly process, reduce the complexity of production and maintenance, and improve production efficiency.

[0017] 4. This axial zero-sequence motor structure enhances structural stability. Through orthogonally distributed arc-shaped vertical plates, the motor can evenly distribute various loads, improving the overall structural strength and stability.

[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 The diagram shows a cross-sectional view of a motor in the prior art, where a represents Scheme 1, b represents Scheme 2, and c represents Scheme 3.

[0021] Figure 2 This is a perspective view of the axial zero-sequence motor structure of this utility model;

[0022] Figure 3 for Figure 2 A schematic diagram of the decomposition process;

[0023] Figure 4 for Figure 2 A cross-sectional diagram;

[0024] Figure 5 for Figure 2 A three-dimensional view of the rear bearing cover before it was deformed and not riveted;

[0025] Figure 6 for Figure 5 A three-dimensional view of the rear bearing cover and the bearing after riveting;

[0026] Reference numerals: 1. Rear bearing cover; 2. Bearing; 3. Claw pole housing; 4. Coil; 5. Frame; 6. Middle pole plate; 7. Magnetic ring; 8. Retainer; 9. Shaft; 10. Front bearing cover; 101. Plate surface; 102. Arc-shaped vertical plate; 103. Pressure head; 104. Shaft hole. Detailed Implementation

[0027] The technical features of this utility model will be further described in detail below with reference to the accompanying drawings so that those skilled in the art can understand them.

[0028] like Figure 2-6As shown, this axial zero-sequence motor structure includes a rear bearing cover (1), a bearing (2), a claw pole housing 3, a coil 4, a frame 5, a middle pole plate 6, a magnetic ring 7, a retainer 8, a rotating shaft 9, and a front bearing cover 10. The rotating shaft 9, as the core component of the motor, is responsible for transmitting power. A retainer 8, used to maintain the stability and integrity of the structure, is mounted on it. A magnetic ring 7 is mounted outside the retainer 8 to form the rotor assembly of the motor. The coil 4 is located on the frame 5 and is responsible for generating an electromagnetic field, enabling the motor to operate normally. The frame 5 provides support for the coil and structural stability. The claw pole housing 3 provides the basic shape of the magnetic circuit, assisting the motor in generating a magnetic field, and is mounted outside the frame 5. The middle pole plate 6 is located inside the frame 5 and mounted outside the magnetic ring 7 to form the stator assembly of the motor. The two ends of the rotating shaft 9 are rotatably connected to the rear bearing cover 1 and the front bearing cover 10 via bearings 2. The bearings 2 support the rotating shaft 9 and ensure its smooth rotation, reducing friction. The front bearing cover 10 cooperates with the rear bearing cover 1 to provide support for the rotating shaft 9. The bearing cover 1, comprising a plate 101 and an arc-shaped vertical plate 102, provides good support for the bearing 2. The center of the plate 101 has a shaft hole 104 for the shaft 9 to pass through. At least two arc-shaped vertical plates 102 are arranged in a equidistant ring around the shaft hole 104, which not only distributes the load more evenly but also improves the overall structural stability. This design helps to radially enclose the bearing 2, reducing the space occupied and the number of parts. The free end of the arc-shaped vertical plate 12, away from the plate 101, can be riveted and bent to form a pressure head 103 for holding the bearing 2. The pressure head 103 bends inward towards the shaft hole 104 in one continuous motion. This bending can result in the entire or part of the free end of the arc-shaped vertical plate 102 being bent. This innovative design allows for better holding of the bearing 2 during fixing, preventing displacement and further reducing production costs. This motor possesses high efficiency and good economic performance. Through innovative fixing methods and compact structural design, it achieves high performance, low cost, and excellent space utilization.

[0029] The assembly process using the above scheme is as follows: First, the rear bearing cover 1 and a bearing 2 are fixed by riveting to form a rear cover plate assembly. This riveting fixation ensures the structural stability of the rear bearing cover, and the simple connection method facilitates mass production. Next, the front bearing cover 10 and another bearing 2 are fixed by a tight-fit press-fit to form a front cover plate assembly. This interference fit provides effective support and helps improve the overall structural precision. Then, the rotating shaft 9 and the retainer 8 are fixed by a tight-fit press-fit to form an interference fit, and the retainer 8 and the magnetic ring 7 are fixed with adhesive to form a rotor assembly. This adhesive fixation improves the bonding strength between the magnetic ring 7 and the retainer 8, ensuring the stability of the rotor during high-speed rotation. Finally, the claw pole shell 3, coil 4, frame 5, middle pole plate 6, and... After assembly, the upper and lower claw pole housings 3 are laser-welded together to form the stator assembly. This laser welding process ensures the sealing and strength of the connection. Then, the rear bearing cover 1 of the rear cover assembly is riveted to one side of the claw pole housing 3 in the stator assembly, maintaining the structural integrity. Next, the rotor assembly is placed inside the stator assembly, and the rotor shaft 9 is inserted into the bearing 2 of the rear bearing cover 1. This process achieves precise alignment between the rotor and stator, crucial for motor performance. Finally, the bearing 2 of the front cover assembly is fitted onto the shaft 9, and the front bearing cover 10 of the front cover assembly is riveted to the other side of the claw pole housing 3 in the stator assembly, forming the finished motor. This ensures the restriction of the rotor's axial position, contributing to stable motor operation. In this way, the axial position of the rotor assembly's retainer 8 is limited by the two bearings 2, preventing movement and forming a zero-sequence motor structure. This results in fewer parts, a simpler manufacturing process, lower cost, and no protrusion at the motor's tail, meeting the needs of customers with space constraints.

[0030] In this embodiment, the arc-shaped upright plate 102 is formed by mechanical stamping of the plate surface 11. This mechanical stamping can mass-produce identical parts in a short time, making it suitable for large-scale production and ensuring production efficiency. Moreover, mechanical stamping can ensure the dimensional accuracy and shape consistency of the product through molds, thereby reducing the need for subsequent processing. At the same time, it can also simplify the structure. The arc-shaped upright plate formed by stamping reduces the number of parts, thereby simplifying the overall structure of the motor and facilitating subsequent assembly and maintenance.

[0031] In this embodiment, the arc-shaped vertical plates 102 are arranged in four orthogonal crosses. This evenly distributes the force applied to the motor, improving the overall structural stability. This layout allows the motor to bear various axial and radial loads more evenly during operation, thereby effectively reducing the risk of structural damage due to stress concentration.

[0032] In this embodiment, bearing 2 is a ball bearing. The advantages of using ball bearings include: low frictional resistance; the main characteristic of ball bearings is their low frictional resistance, which reduces energy loss and improves motor efficiency. This makes the motor run more smoothly, reduces heat generation, and extends service life. High load-bearing capacity; ball bearings can withstand high radial and axial loads, making them suitable for motor operation under various load conditions. This plays a crucial role in the stability and reliability of the motor, especially for an external rotor motor structure.

[0033] The main innovations of this axial zero-sequence motor structure are:

[0034] 1. Integrated design of rear bearing cover: The rear bearing cover is designed to include a plate and an arc-shaped vertical plate. The end of the arc-shaped vertical plate is equipped with a pressure head that can be riveted and bent. By bending inward, the bearing is held in place, achieving zero axial movement.

[0035] 2. Curved vertical plate layout: At least two curved vertical plates are arranged in a ring around the shaft hole at equal intervals, preferably four in an orthogonal cross distribution, to enhance structural stability and load uniformity.

[0036] 3. Simplified process: The integral forming process through mechanical stamping reduces the number of parts and lowers the complexity of processing and assembly.

[0037] In this way, the axial zero-crossing motor structure solves the problems of axial cross-flow, numerous parts, complex manufacturing process, and space-consuming tail protrusion that exist in traditional motor structures. It also achieves multiple technical benefits such as zero axial cross-flow, compact structure, reduced cost, and enhanced space adaptability.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An axial zero-sequence motor structure, characterized in that, The rear bearing cover (1) of the motor includes a plate (101) and an arc-shaped vertical plate (102). The center of the plate (101) is provided with a shaft hole (104) for the motor shaft (9) to pass through. The arc-shaped vertical plate (102) is provided in at least two and is arranged in a ring around the shaft hole (104) at equal intervals to wrap the bearing (2) of the motor in the radial direction. The free end of the arc-shaped vertical plate (12) away from the plate (101) can be bent by riveting to form a pressure head (103) for holding the bearing (2), and the pressure head (103) is bent inward toward the shaft hole (104).

2. The axial zero-sequence motor structure according to claim 1, characterized in that, The arc-shaped vertical plate (102) is formed by mechanical stamping of the plate surface (11).

3. The axial zero-sequence motor structure according to claim 1, characterized in that, The arc-shaped vertical plates (102) are arranged in four orthogonal crosses.

4. The axial zero-sequence motor structure according to any one of claims 1-3, characterized in that, The motor also includes a claw pole housing (3), a coil (4), a frame (5), a middle pole plate (6), a magnetic ring (7), a retainer (8), and a front bearing cover (10). The retainer (8) is fitted on the shaft (9), and the magnetic ring (7) is fitted outside the retainer (8) to form the rotor assembly of the motor. The coil (4) is located on the frame (5), the claw pole housing (3) is fitted outside the frame (5), and the middle pole plate (6) is located inside the frame (5) and fitted outside the magnetic ring (7) to form the stator assembly of the motor. The two ends of the shaft (9) are rotatably connected to the rear bearing cover (1) and the front bearing cover (10) through a bearing (2).

5. The axial zero-sequence motor structure according to claim 4, characterized in that, The bearing (2) is a ball bearing.

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