Bidirectional permanent magnet synchronous servo motor assembly

Abstract

The utility model discloses a bidirectional permanent magnet synchronous servo motor assembly, and belongs to the technical field of servo motors, the bidirectional permanent magnet synchronous servo motor assembly comprises a transmission shaft, a stator assembly, a rotor assembly and a shell, the shell is of a cylindrical structure with two open ends, the rotor assembly sleeves the periphery of the transmission shaft, the stator assembly is mounted on the inner wall surface of the shell, and the stator assembly is mounted on the outer wall surface of the shell. The rotor assembly is located in the stator assembly, the rotor assembly and the stator assembly are coaxially arranged, a gap exists between the rotor assembly and the stator assembly, key grooves used for being connected with an equipment rotating shaft are formed in the two ends of the transmission shaft, and installation rings used for being connected with an equipment shell are arranged at the two ends of the shell. The structure of the servo motor is further optimized, bidirectional output arrangement is adopted, the servo motor is not provided with a bearing, and the structure is more compact and smaller.

Description

Technical Field

[0001] This application relates to the technical field of servo motors, and in particular, to a bidirectional permanent magnet synchronous servo motor assembly. Background Art

[0002] Servo motors are currently the core key products of emerging electro-hydrostatic actuating systems. It is equivalent to simplifying the traditional three products of "motor, hydraulic pump, and servo valve" into one, and has functions such as "power, energy conversion, and control", directly converting adjustable electric power into controllable flow rate. By eliminating the valve control link, while retaining the advantages of a hydraulic system such as strong heavy-load capacity, it realizes electrification, eliminates throttling losses, greatly simplifies the design, reduces energy consumption by 80%, improves the reliability by an order of magnitude, and significantly reduces the life cycle cost.

[0003] Currently, most servo motor pumps on the market are designed and assembled by separating the servo motor and the hydraulic pump. There are also those that integrate the components such as the stator and rotor of the servo motor and the rotor of the hydraulic pump coaxially, within the same shell, and in the same flow field. Related prior art such as the Chinese patent application "An insert-type servo motor pump", application number: CN202311233043.X, discloses a thin shell and functional component assemblies installed inside. The thin shell is divided into left and right chambers. Inside the left chamber, a motor stator assembly, a component mounting seat, a pump assembly, and a planar flow distributor are installed. Among them, the pump assembly and the planar flow distributor are both installed inside the component mounting seat, and the component mounting seat is installed on the left side of the motor stator assembly; inside the right chamber, a resolver and an electrical connector are installed, and the resolver stator and the electrical connector are installed on the thin shell; a shaft penetrates through the left and right chambers, and the resolver rotor in the right chamber is installed on the shaft; inside the left chamber, from left to right, the pump assembly, the first bearing, the rotor assembly, and the second bearing are sequentially installed on the shaft; the shaft directly drives the planar pump cylinder in the pump assembly to rotate, forming a pair of high-speed rotating planar friction pairs with the fixed planar flow distributor.

[0004] In the above structural design of the servo motor, its structure is still relatively complex and there is room for further improvement. Summary of the Utility Model

[0005] The technical problem to be solved by this application is to provide a bidirectional permanent magnet synchronous servo motor assembly, further optimize the structure of the servo motor, adopt a bidirectional output setting, and have a bearingless setting for the servo motor, making the structure more compact and small.

[0006] The technical solution adopted in this application is as follows: A two-way permanent magnet synchronous servo motor assembly includes a drive shaft, a stator assembly, a rotor assembly, and a housing. The housing has a cylindrical structure with both ends open. The rotor assembly is sleeved on the outer periphery of the drive shaft. The stator assembly is installed on the inner wall surface of the housing body. The rotor assembly is located inside the stator assembly. The rotor assembly and the stator assembly are coaxially arranged and there is a gap between them. Key grooves for connecting with the equipment shaft are provided at both ends of the drive shaft. Mounting rings for connecting with the equipment housing are provided at both ends of the housing.

[0007] Compared with the prior art, the advantages of this application are as follows. First, the structure of the servo motor in this application is simplified, unnecessary components are deleted, and only the stator assembly and the rotor assembly are designed to convert electrical energy into mechanical energy. The housing is designed to install the stator assembly, and the drive shaft is designed to output the torque of the rotor assembly. This makes the structure of this application more compact and small. Second, the housing in this application adopts a cylindrical structure with both ends open. The structural design of the housing makes the drive shaft directly exposed outside, and the equipment shaft will be directly connected to the drive shaft of this application. Moreover, this application is a symmetric structure, and key grooves for connecting with the equipment shaft are provided at both ends of the drive shaft, realizing the two-way output of this application. In addition, mounting rings for connecting with the equipment housing are provided at both ends of the housing. The housing of the servo motor is directly connected to the housing of the equipment, and the fixing or limiting structure is cancelled, making the entire product structure more simplified and the product capable of being miniaturized.

[0008] In some embodiments of this application, the end of the housing penetrates through the connection end surface of the mounting ring. In this application, the connection end surface where the mounting ring is located is not a flat plane structure. Then, when the mounting ring is installed and connected to the equipment housing, the end of the housing plays a radial limiting role, and the mounting ring plays an axial limiting role, which will effectively improve the installation accuracy and the stability of the bowl shape.

[0009] In some embodiments of this application, the outer diameter of the mounting ring is larger than the outer diameter of the housing, and a plurality of mounting holes are regularly arranged on the outer periphery of the mounting ring. Specifically, in this application, the housing and the equipment housing are fixedly connected through the cooperation of the mounting holes and structures such as bolts, and the housing and the stator assembly are installed on the equipment.

[0010] In some embodiments of this application, a plurality of heat dissipation fins are regularly arranged on the outer peripheral surface of the housing. The length direction of the heat dissipation fins is parallel to the axial direction of the housing, and the plurality of heat dissipation fins cover the entire outer peripheral surface of the housing. In this application, the housing also plays a role in heat dissipation, enabling the heat generated during the operation of the servo motor to be timely exported to the outside.

[0011] In some embodiments of the present application, the device housing includes a side cover that blocks the open end of the outer shell. In the present application, the provision of the side cover on the device housing can effectively protect the internal structure of the servo motor and prevent foreign objects from entering the servo motor.

[0012] In some embodiments of the present application, a shaft hole is provided at the central axis of the side cover, and the device rotating shaft passes through the shaft hole and is connected to the transmission shaft; the device rotating shaft is coaxially and fixedly connected to the transmission shaft.

[0013] In some embodiments of the present application, the shaft hole is a stepped hole including a first through hole and a second through hole. The diameter of the first through hole is larger than that of the second through hole. A bearing is installed on the inner wall surface of the first through hole, and the side cover is connected to the device rotating shaft through the bearing.

[0014] In the present application, the bearing provided in the outer shell in the prior art is deleted, and instead, a bearing is added inside the device, thereby reducing the friction when the device rotating shaft rotates.

[0015] In some embodiments of the present application, there is a gap between the device rotating shaft located in the second mounting hole and the second mounting hole. This ensures that the device rotating shaft does not contact the side cover and reduces the friction when the device rotating shaft rotates.

[0016] In some embodiments of the present application, a fan is sleeved outside the device rotating shaft, and the rotation of the device rotating shaft drives the fan to rotate synchronously. The rotation of the fan realizes heat dissipation for the device.

[0017] On the basis of conforming to common knowledge in the art, the above embodiments can be combined arbitrarily. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present application will be further described in detail below with reference to the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be used as a limitation to the scope of the present application. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 is a schematic structural diagram of the unassembled state of the present application;

[0020] Figure 2 is Figure 1 a cross-sectional view of;

[0021] Figure 3 is a schematic structural diagram of the assembled state of the present application;

[0022] Figure 4 is Figure 3 a cross-sectional view of.

[0023] Among them, the specific descriptions of the attached drawing reference numerals are as follows: 1. Transmission shaft; 2. Stator assembly; 3. Rotor assembly; 4. Outer shell; 5. Keyway; 6. Mounting ring; 7. Rotating shaft; 8. Housing; 9. Mounting hole; 10. Heat sink; 11. Side cover; 12. Shaft hole; 13. Bearing; 14. Fan. Specific implementation manners

[0024] The following will describe the present application in detail with reference to the attached drawings.

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] A two-way permanent magnet synchronous servo motor assembly, as shown in Embodiment 1 Figure 1 , Figure 2 : It includes a transmission shaft 1, a stator assembly 2, a rotor assembly 3 and an outer shell 4. The outer shell 4 has a cylindrical structure with both ends open. The structural design of the outer shell 4 makes the transmission shaft 1 directly exposed. The rotating shaft 7 of the device will be directly connected to the transmission shaft 1 of the present application. Moreover, the present application has a symmetrical structure. Keyways 5 for connecting to the rotating shaft 7 of the device are provided at both ends of the transmission shaft 1, realizing the two-way output of the present application. The rotor assembly 3 is sleeved on the outer periphery of the transmission shaft 1. The stator assembly 2 is installed on the inner wall surface of the outer shell 4 body. The rotor assembly 3 is located inside the stator assembly 2. The rotor assembly 3 and the stator assembly 2 are coaxially arranged and there is a gap between them. Keyways 5 for connecting to the rotating shaft 7 of the device are provided at both ends of the transmission shaft 1. Mounting rings 6 for connecting to the device housing 8 are provided at both ends of the outer shell 4. The outer shell 4 of the servo motor is directly connected to the outer shell 4 of the device, canceling the fixed or limiting structure, making the overall product structure more simplified and the product capable of being miniaturized.

[0027] The present application simplifies the structure of the servo motor, deletes unnecessary components, and only designs the stator assembly 2 and the rotor assembly 3 to convert electrical energy into mechanical energy, designs the outer shell 4 for installing the stator assembly 2, and designs the transmission shaft 1 to output the torque of the rotor assembly 3. This makes the structure of the present application more compact and small.

[0028] Embodiment 2, as shown in Figures 1 to 4 : The end of the outer shell 4 penetrates the connection end face of the mounting ring 6. In the present application, the connection end face where the mounting ring 6 is located is not a flat plane structure. When the mounting ring 6 is installed and connected to the device housing 8, the end of the outer shell 4 plays a radial limiting role, and the mounting ring 6 plays an axial limiting role, which will effectively improve the installation accuracy and the stability of the bowl shape.

[0029] The outer diameter of the installation ring 6 is greater than that of the outer shell 4, and a plurality of installation holes 9 are regularly arranged on the outer periphery of the installation ring 6. Specifically, in this application, the outer shell 4 and the equipment housing 8 are fixedly connected through the cooperation of the installation holes 9 and structures such as bolts, so as to install the housing 8 and the stator assembly 2 on the equipment.

[0030] A plurality of heat dissipation fins 10 are regularly arranged on the outer peripheral surface of the outer shell 4. The length direction of the heat dissipation fins 10 is parallel to the axial direction of the outer shell 4, and the plurality of heat dissipation fins 10 cover the entire outer peripheral surface of the outer shell 4. In this application, the outer shell 4 also plays a role in heat dissipation, enabling the heat generated by the operation of the servo motor to be timely exported outwards.

[0031] The equipment housing 8 includes a side cover 11, and the side cover 11 blocks the open end of one end of the outer shell 4. In this application, the setting of the side cover 11 on the equipment housing 8 can effectively protect the internal structure of the servo motor and prevent foreign objects from entering the servo motor.

[0032] A shaft hole 12 is opened at the central axis of the side cover 11, and the equipment rotating shaft 7 passes through the shaft hole 12 and is fixedly connected to the transmission shaft 1; the equipment rotating shaft 7 and the transmission shaft 1 are coaxially fixedly connected.

[0033] The shaft hole 12 is a stepped hole including a first through hole and a second through hole. The aperture of the first through hole is larger than that of the second through hole. A bearing 13 is installed on the inner wall surface of the first through hole, and the side cover 11 is connected to the equipment rotating shaft 7 through the bearing 13. In this application, the bearing 13 originally provided inside the outer shell 4 in the prior art is deleted, and instead, a bearing 13 is added inside the equipment, thereby reducing the friction force when the equipment rotating shaft 7 rotates. There is a gap between the equipment rotating shaft 7 located in the second installation hole 9 and the second installation hole 9. Thus, it is ensured that the equipment rotating shaft 7 does not contact the side cover 11, reducing the friction force when the equipment rotating shaft 7 rotates.

[0034] A fan 14 is sleeved outside the equipment rotating shaft 7, and the rotation of the equipment rotating shaft 7 drives the fan 14 to rotate synchronously. The rotation of the fan 14 realizes heat dissipation for the equipment.

[0035] Other contents of the second embodiment are the same as those of the first embodiment.

[0036] The above has introduced this application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand this application and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A bidirectional permanent magnet synchronous servo motor assembly, characterized in that: The invention comprises a transmission shaft (1), a stator assembly (2), a rotor assembly (3) and a housing (4); the housing (4) is a cylindrical structure with two ends open; the rotor assembly (3) is sleeved on the outer circumference of the transmission shaft (1); the stator assembly (2) is mounted on the inner wall of the housing (4); the rotor assembly (3) is located inside the stator assembly (2); the rotor assembly (3) and the stator assembly (2) are coaxially arranged with a gap therebetween; both ends of the transmission shaft (1) are provided with keyways (5) for connecting to a rotating shaft (7) of an equipment; and both ends of the housing (4) are provided with mounting rings (6) for connecting to a housing (8) of an equipment.

2. A bidirectional permanent magnet synchronous servo motor assembly according to claim 1, characterized in that: The end of the housing (4) passes through the connecting end surface of the mounting ring (6).

3. A bidirectional permanent magnet synchronous servo motor assembly according to claim 1, characterized in that: The outer diameter of the mounting ring (6) is greater than the outer diameter of the outer shell (4), and a plurality of mounting holes (9) are regularly arranged on the outer circumference of the mounting ring (6).

4. A bidirectional permanent magnet synchronous servo motor assembly according to claim 1, characterized in that: A plurality of heat sinks (10) are regularly arranged on the outer circumference of the shell (4); the length direction of the heat sink (10) is parallel to the axial direction of the shell (4); and the plurality of heat sinks (10) cover the entire outer circumference of the shell (4).

5. The bidirectional permanent magnet synchronous servo motor assembly according to claim 1, characterized in that: The device housing (8) comprises a side cover (11), and the side cover (11) blocks an open end of the outer shell (4).

6. A bidirectional permanent magnet synchronous servo motor assembly according to claim 5, characterized in that: The central axis of the side cover (11) is provided with an axial hole (12), and the device rotating shaft (7) passes through the axial hole (12) and is connected to the transmission shaft (1); the device rotating shaft (7) and the transmission shaft (1) are coaxially fixedly connected.

7. A bidirectional permanent magnet synchronous servo motor assembly according to claim 6, characterized in that: The shaft hole (12) is a stepped hole including a first through hole and a second through hole, the aperture of the first through hole is larger than that of the second through hole, a bearing (13) is installed on the inner wall of the first through hole, and the side cover (11) is connected to the equipment shaft (7) via the bearing (13).

8. A bidirectional permanent magnet synchronous servo motor assembly according to claim 7, characterized in that: There is a gap between the device rotating shaft (7) located in the second mounting hole (9) and the second mounting hole (9).

9. A bidirectional permanent magnet synchronous servo motor assembly according to claim 1 or 8, characterized in that: A fan (14) is disposed on the outer cover of the device rotating shaft (7), and the rotation of the device rotating shaft (7) drives the fan (14) to rotate synchronously.

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