Mute claw-pole permanent magnet synchronous motor

Abstract

The utility model relates to the technical field of synchronous motors, and provides a mute claw-pole permanent magnet synchronous motor, which comprises a casing and a cover, a rotor is mounted in the casing, a rotating shaft is sleeved in the rotor, the rotor is fixedly connected with the rotating shaft, the rotating shaft is rotatably connected with the casing and the cover, and the cover is fixedly connected with the casing. A boss is arranged on the machine shell and / or the machine cover, a bearing is installed in the boss, the bearing is arranged outside the rotating shaft in a sleeved mode, a magnetism insulation plate is installed in the boss, the magnetism insulation plate is arranged outside the bearing in a sleeved mode, and the bearing is an oil bearing. According to the claw-pole permanent magnet synchronous motor, the rotor is fixedly connected with the rotating shaft, and the rotating shaft is rotatably connected with the machine shell and the machine cover, so that the fixed structure of the rotating shaft and the machine shell in the traditional claw-pole permanent magnet synchronous motor is changed, and the rotor can freely rotate without direct friction with the rotating shaft when the motor runs; therefore, noise sources generated by friction are effectively reduced, and the purpose of remarkably reducing operation noise is achieved.

Description

Technical Field

[0001] This utility model relates to the field of synchronous motor technology, and in particular to a silent claw-pole permanent magnet synchronous motor. Background Technology

[0002] Claw-pole permanent magnet synchronous motors (PMSMs) are widely used in various industrial and consumer electronics products due to their high efficiency, compact structure, and good speed regulation performance. These motors typically consist of key components such as a housing, stator, rotor, and shaft. The rotor contains embedded permanent magnets, which interact with the magnetic field generated by the stator to achieve rotation. While meeting basic functional requirements, traditional claw-pole PMSM designs also face a series of technical challenges, particularly in noise control. With increasing market demands for quiet motor operation, effectively reducing motor noise during operation has become an important research direction.

[0003] However, in traditional claw-pole permanent magnet synchronous motor designs, the shaft is typically fixed to the housing. This structure inevitably leads to direct friction between the rotor and the housing or other internal components during rotation. This friction not only increases mechanical losses but also becomes an additional source of noise, severely impacting the motor's quiet operation. The noise problem becomes even more pronounced under high loads or long-term operation, limiting the use of this type of motor in noise-sensitive applications.

[0004] The purpose of this invention is to solve the problem of high noise in traditional claw pole permanent magnet synchronous motors. Utility Model Content

[0005] The purpose of this invention is to solve the problem of high noise in traditional claw-pole permanent magnet synchronous motors. The invention employs the following technical solution:

[0006] A silent claw-pole permanent magnet synchronous motor includes a housing and a cover. A rotor is installed inside the housing, and a rotating shaft is fitted inside the rotor. The rotor is fixedly connected to the rotating shaft, and the rotating shaft is rotatably connected to the housing and the cover.

[0007] As described above, in a silent claw-pole permanent magnet synchronous motor, the housing and / or cover have a boss, a bearing is installed inside the boss, and the bearing is sleeved on the outside of the rotating shaft.

[0008] As described above, in a silent claw-pole permanent magnet synchronous motor, an anti-magnetic plate is installed inside the boss, and the anti-magnetic plate is sleeved outside the bearing.

[0009] In the silent claw-pole permanent magnet synchronous motor described above, the bearing is one or a combination of two types: oil-impregnated bearing and ball bearing.

[0010] As described above, in a silent claw-pole permanent magnet synchronous motor, the rotor includes a gear shaft, which is sleeved outside the rotating shaft and fixedly connected to the rotating shaft. A magnet is sleeved on the gear shaft and fixedly connected to the gear shaft.

[0011] As described above, in a silent claw-pole permanent magnet synchronous motor, the rotating shaft is provided with at least one snap-fit ​​portion, and the gear shaft is provided with at least one mating portion, wherein the snap-fit ​​portion snaps into the mating portion.

[0012] In the silent claw-pole permanent magnet synchronous motor described above, the locking part is a slot and the matching part is a block.

[0013] In the silent claw-pole permanent magnet synchronous motor described above, the matching part is a slot and the locking part is a block.

[0014] As described above, in a silent claw-pole permanent magnet synchronous motor, a stator is installed inside the housing, and the stator is sleeved outside the rotor.

[0015] In the silent claw-pole permanent magnet synchronous motor described above, the insulating plate is made of aluminum or copper.

[0016] Implementing the embodiments of this utility model has the following beneficial effects:

[0017] 1. In this utility model, by fixing the rotor to the shaft and forming a rotatable connection between the shaft and the housing and cover, the structure of the shaft being fixed to the housing in the traditional claw pole permanent magnet synchronous motor is changed. This allows the rotor to rotate freely without direct friction with the shaft during motor operation, thereby effectively reducing the noise source caused by friction and achieving the goal of significantly reducing operating noise.

[0018] In summary, this invention solves the problem of high noise in traditional claw-pole permanent magnet synchronous motors. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a silent claw-pole permanent magnet synchronous motor according to this utility model.

[0021] Figure 2 This is an exploded view of a silent claw-pole permanent magnet synchronous motor according to this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the cover of a silent claw-pole permanent magnet synchronous motor according to this utility model.

[0023] Figure 4 This is a schematic diagram of the housing structure of a silent claw-pole permanent magnet synchronous motor according to this utility model.

[0024] Figure 5 This is a schematic diagram of the rotor structure of a silent claw-pole permanent magnet synchronous motor according to this utility model.

[0025] Figure 6 This is a schematic diagram of the shaft structure of a silent claw-pole permanent magnet synchronous motor according to this utility model.

[0026] Figure 7 This is a schematic diagram of the structure of a plastic-sealed waterproof claw pole permanent magnet synchronous motor, wherein the housing and cover have through holes.

[0027] As shown in the figure:

[0028] 1. Housing; 2. Cover; 3. Boss; 4. Magnetic shield; 5. Bearing; 6. Stator; 7. Rotor; 71. Shaft; 711. Snap-fit ​​part; 72. Gear shaft; 73. Magnet. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1 to 6 As shown, this utility model proposes a silent claw-pole permanent magnet synchronous motor, including a housing 1 and a cover 2. A rotor 7 is installed inside the housing 1, and a rotating shaft 71 is fitted inside the rotor 7. The rotor 7 and the rotating shaft 71 are fixedly connected, and the rotating shaft 71 is rotatably connected to the housing 1 and the cover 2. A stator 6 is installed inside the housing 1 and fitted outside the rotor 7. By fixing the rotor 7 to the rotating shaft 71 and creating a rotatable connection between the rotating shaft 71 and the housing 1 and cover 2, the structure of the rotating shaft being fixed to the housing in traditional claw-pole permanent magnet synchronous motors is changed. Thus, during motor operation, the rotor 7 can rotate freely without friction with the rotating shaft 71. This reduces noise sources caused by friction, thereby achieving the goal of reducing operating noise.

[0031] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the housing 1 and the cover 2 are provided with protrusions 3, and bearings 5 ​​are installed within the protrusions 3, with the bearings 5 ​​sleeved on the rotating shaft 71. Specifically, when the motor is running, due to the magnetic field, the rotor 7 begins to rotate, driving the rotating shaft 71, which is fixedly connected to it, to rotate together. This allows the rotating shaft to rotate freely between the housing and the cover without direct contact, reducing wear between mechanical parts and also reducing noise and heat generated by friction. At the same time, by using the bearings 5 ​​to support the rotating shaft 71, the stability and accuracy of the rotating shaft during high-speed rotation are ensured, further enhancing the overall performance of the motor.

[0032] Optionally, in some embodiments, lubricating oil can be stored within the boss 3. The lubricating oil continuously lubricates the bearing 5, further reducing friction and wear between the bearing 5 and the shaft 71. Specifically, when the motor is running, the lubricating oil stored in the boss 3 is distributed to the critical contact areas of the bearing 5 through capillary action or centrifugal force, forming a stable lubricating film. This not only significantly reduces the coefficient of friction but also reduces heat and noise generated by friction, thereby improving the smoothness and quietness of motor operation.

[0033] Optionally, in some embodiments, the bearing 5 is one or a combination of oil-impregnated bearings and ball bearings. When an oil-impregnated bearing is used, the lubricating oil inside it can form a lubricating film between the shaft 71 and the bearing, thereby reducing the coefficient of friction between the two and reducing wear and noise. When a ball bearing is used, the balls act as an intermediate medium, and during the rotation of the shaft 71, they significantly reduce friction and energy loss through rolling.

[0034] Optionally, in some embodiments, the bearing 5 is made of metal or plastic.

[0035] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, a magnetic shielding plate 4 is installed inside the boss 3. The magnetic shielding plate 4 is sleeved outside the bearing 5, and the material of the magnetic shielding plate 4 is aluminum or copper. The function of the magnetic shielding plate 4 is to isolate the magnetic field and prevent the magnetic field inside the motor from forming unnecessary magnetic circuits through metal parts (such as the housing 1 and the cover 2), thereby affecting the normal operating efficiency of the motor or causing additional energy loss. Specifically, when the motor is running, the magnet 73 on the rotor 7 generates a magnetic field, and the magnetic shielding plate 4 effectively blocks the direct influence of this magnetic field on the bearing area, ensuring that the magnetic field mainly acts between the stator and the rotor to maintain an efficient energy conversion process.

[0036] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the rotor 7 includes a gear shaft 72, which is sleeved on the rotating shaft 71 and fixedly connected to the rotating shaft 71. A magnet 73 is sleeved on the gear shaft 72 and fixedly connected to the gear shaft 72. The rotating shaft 71 is provided with at least one engaging portion 711, and the gear shaft 72 is provided with at least one matching portion. The engaging portion 711 engages with the matching portion. The engaging portion 711 is a slot, and the matching portion is a block. Specifically, the gear shaft 72 is sleeved on the rotating shaft 71 and fixedly connected to it through the engaging portion 711 (slot) and the matching portion (block), ensuring that the two can rotate synchronously, enhancing the connection strength and stability, and reducing the risk of loosening during operation. The magnet 73 is sleeved on the gear shaft 72 and fixedly connected to it, constituting the magnetic field source of the motor. When the motor is running, the current passes through the stator winding to generate a magnetic field, which acts on the magnet 73 and drives the gear shaft 72 and the rotating shaft 71 to rotate together.

[0037] Optionally, in some embodiments, the matching part is a card slot, and the card-connecting part 711 is a card block.

[0038] Optionally, in some embodiments, the rotating shaft 71 is integrally formed with the gear shaft 72 by an insert injection molding process.

[0039] Optionally, in some embodiments, the gear teeth of the gear shaft 72 are spur teeth, the bracket 8 is provided with a gear set, the gear set meshes with the gear shaft 72, the rotor 7 drives the gear set to rotate through the gear shaft 72, and the gear set is used to drive the power output end of the motor to rotate.

[0040] Optionally, in some embodiments, the teeth of the gear shaft 72 are ratchet teeth, and the rotor 7 drives the gear set to rotate in one direction through the ratchet teeth.

[0041] Optionally, in some embodiments, the portions of the housing 1 and the cover 2 that connect to the rotor 7 are designed with openings. These openings allow the shaft 71 to pass through the housing and cover, ensuring the rotor can be correctly installed inside the stator and rotate freely without additional assembly space. This simplifies the assembly process of the motor's internal components, improves assembly efficiency, and helps to precisely control the position of the rotor 7, ensuring dynamic balance and stability during motor operation.

[0042] Example 1:

[0043] This invention proposes a silent claw-pole permanent magnet synchronous motor, comprising a housing 1 and a cover 2. A rotor 7 is installed inside the housing 1, and a rotating shaft 71 is fitted inside the rotor 7. The rotor 7 and the rotating shaft 71 are fixedly connected, and the rotating shaft 71 is rotatably connected to the housing 1 and the cover 2. A stator 6 is installed inside the housing 1 and fitted outside the rotor 7. By fixing the rotor 7 to the rotating shaft 71 and creating a rotatable connection between the rotating shaft 71 and the housing 1 and the cover 2, the structure of the rotating shaft being fixed to the housing in traditional claw-pole permanent magnet synchronous motors is changed. Thus, during motor operation, the rotor 7 can rotate freely without friction with the rotating shaft 71. This reduces noise sources caused by friction, thereby achieving the goal of reducing operating noise.

[0044] The housing 1 and cover 2 are provided with bosses 3, and bearings 5 ​​are installed inside the bosses 3, with the bearings 5 ​​sleeved around the rotating shaft 71. Specifically, when the motor is running, due to the magnetic field, the rotor 7 begins to rotate, driving the rotating shaft 71, which is fixedly connected to it, to rotate together. This allows the rotating shaft to rotate freely between the housing and cover without direct contact, reducing wear between mechanical parts and lowering noise and heat generated by friction. At the same time, by using the bearings 5 ​​to support the rotating shaft 71, the smoothness and accuracy of the rotating shaft during high-speed rotation are ensured, further enhancing the overall performance of the motor. The bearings 5 ​​are oil-impregnated bearings. When oil-impregnated bearings are used, the lubricating oil inside can form a lubricating film between the rotating shaft 71 and the bearing, thereby reducing the coefficient of friction between the two and reducing wear and noise.

[0045] A magnetic shielding plate 4 is installed inside the boss 3, and is fitted over the bearing 5. The magnetic shielding plate 4 is made of aluminum or copper. The function of the magnetic shielding plate 4 is to isolate the magnetic field and prevent the magnetic field inside the motor from forming unnecessary magnetic circuits through metal parts (such as the housing 1 and the cover 2), thereby affecting the normal operating efficiency of the motor or causing additional energy loss. Specifically, when the motor is running, the magnet 73 on the rotor 7 generates a magnetic field, and the magnetic shielding plate 4 effectively blocks the direct influence of this magnetic field on the bearing area, ensuring that the magnetic field mainly acts between the stator and the rotor to maintain a highly efficient energy conversion process.

[0046] The rotor 7 includes a gear shaft 72, which is sleeved on the outside of the rotating shaft 71 and fixedly connected to it. A magnet 73 is sleeved on the gear shaft 72 and fixedly connected to it. The rotating shaft 71 is provided with at least one engaging portion 711, and the gear shaft 72 is provided with at least one mating portion. The engaging portion 711 engages with the mating portion. The engaging portion 711 is a slot, and the mating portion is a block. Specifically, the gear shaft 72 is sleeved on the outside of the rotating shaft 71 and fixedly connected to it through the engaging portion 711 (slot) and the mating portion (block), ensuring that the two can rotate synchronously, enhancing the connection strength and stability, and reducing the risk of loosening during operation. The magnet 73 is sleeved on the gear shaft 72 and fixedly connected to it, forming the magnetic field source of the motor. When the motor is running, the current passes through the stator windings to generate a magnetic field, which acts on the magnet 73, driving the gear shaft 72 and the rotating shaft 71 to rotate together.

[0047] The implementation method of Example 2 is as follows:

[0048] The difference between Embodiment 2 and Embodiment 1 is that the connection between the housing 1 and cover 2 and the rotor 7 is an open design. This open design allows the rotor 7 to pass through the housing 1 and cover 2, ensuring that the rotor 7 can be correctly installed inside the stator 6 and rotate freely without additional assembly space. This simplifies the assembly process of the internal components of the motor, improves assembly efficiency, and helps to precisely control the position of the rotor 7, ensuring the dynamic balance and stability of the motor during operation.

[0049] Specifically, the working principle of this invention is as follows:

[0050] The silent claw-pole permanent magnet synchronous motor changes the traditional design's fixed shaft-to-casing structure by fixing the rotor 7 to the shaft 71 and creating a rotatable connection between the shaft 71 and the housing 1 and cover 2. During motor operation, the magnetic field generated by the stator 6 acts on the magnet 73 on the rotor 7, causing the rotor 7 to rotate and driving the fixedly connected gear shaft 72 and shaft 71 to rotate together. This design allows the rotor 7 to rotate freely without direct friction with the shaft 71, effectively reducing noise sources caused by friction.

[0051] The housing 1 and cover 2 have protrusions 3, inside which oil-impregnated bearings 5 ​​are installed, which are sleeved on the outside of the rotating shaft 71. When the motor is running, the lubricating oil in the oil-impregnated bearing 5 can form a lubricating film between the rotating shaft 71 and the bearing, which greatly reduces the coefficient of friction between the two, and at the same time reduces wear and noise. In addition, this design also ensures the stability and accuracy of the rotating shaft 71 during high-speed rotation, improving the overall performance of the motor.

[0052] To prevent the internal magnetic field of the motor from unnecessarily affecting other components, an insulating magnetic plate 4 made of aluminum or copper is installed inside the boss 3, which is fitted over the bearing 5. The insulating magnetic plate 4 effectively isolates the magnetic field generated by the magnet 73 on the rotor 7, preventing it from directly affecting the bearing area and ensuring that the magnetic field is mainly concentrated between the stator 6 and the rotor 7 to maintain a highly efficient energy conversion process. This structure not only improves the motor's operating efficiency but also extends the service life of each component, providing a more reliable operating environment for the motor.

[0053] In summary, this invention solves the problem of high noise in traditional claw-pole permanent magnet synchronous motors.

[0054] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A silent claw-pole permanent magnet synchronous motor, comprising a housing (1) and a cover (2), characterized in that, A rotor (7) is installed inside the housing (1), and a rotating shaft (71) is fitted inside the rotor (7). The rotor (7) is fixedly connected to the rotating shaft (71), and the rotating shaft (71) is rotatably connected to the housing (1) and the cover (2).

2. The silent claw-pole permanent magnet synchronous motor according to claim 1, characterized in that, The housing (1) and / or cover (2) are provided with a boss (3), and a bearing (5) is installed in the boss (3). The bearing (5) is sleeved on the outside of the rotating shaft (71).

3. A silent claw-pole permanent magnet synchronous motor according to claim 2, characterized in that, A magnetic shield (4) is installed inside the boss (3), and the magnetic shield (4) is sleeved on the outside of the bearing (5).

4. A silent claw-pole permanent magnet synchronous motor according to claim 2, characterized in that, The bearing (5) is one or a combination of two types: oil-impregnated bearing and ball bearing.

5. A silent claw-pole permanent magnet synchronous motor according to claim 1, characterized in that, The rotor (7) includes a gear shaft (72), which is sleeved on the rotating shaft (71) and fixedly connected to the rotating shaft (71). A magnet (73) is sleeved on the gear shaft (72) and fixedly connected to the gear shaft (72).

6. A silent claw-pole permanent magnet synchronous motor according to claim 5, characterized in that, The rotating shaft (71) is provided with at least one snap-fit ​​portion (711), and the gear shaft (72) is provided with at least one matching portion, wherein the snap-fit ​​portion (711) snaps into the matching portion.

7. A silent claw-pole permanent magnet synchronous motor according to claim 6, characterized in that, The latching part (711) is a slot, and the matching part is a block.

8. A silent claw-pole permanent magnet synchronous motor according to claim 6, characterized in that, The matching part is a card slot, and the card-connecting part (711) is a card block.

9. A silent claw-pole permanent magnet synchronous motor according to claim 1, characterized in that, A stator (6) is installed inside the housing (1), and the stator (6) is sleeved on the outside of the rotor (7).

10. A silent claw-pole permanent magnet synchronous motor according to claim 3, characterized in that, The non-magnetic plate (4) is made of aluminum or copper.

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