High-speed brushless motor

Abstract

The utility model discloses a high-speed brushless motor, which comprises a shell, a casing, a stator assembly, a rotor assembly and a wind wheel, the shell is sleeved outside the casing, an air duct is formed between the shell and the casing, the stator assembly is fixed in the casing, the rotor assembly is arranged in the casing and is arranged corresponding to the stator assembly, the wind wheel is arranged at one end of the air duct and is arranged corresponding to the air duct, and the rotor assembly is arranged at the other end of the air duct. The wind wheel comprises a body and a flow baffle, the body comprises fan blades, the flow baffle is round and fixed to the periphery of the fan blades, the flow baffle and the body are of an integrally-formed structure, and the flow baffle is located on the inner side of the shell. Due to the fact that the flow baffles are arranged on the peripheries of the fan blades, air guided by the fan blades can enter the air channel, the air enters the air channel in order, the turbulent flow phenomenon is avoided, the air flow series flow phenomenon is avoided, and noise is greatly reduced. By arranging the outer shell and the machine shell, the air channel is composed of the outer shell and the inner shell, the outer shell and the inner shell can be conveniently formed and machined respectively, the machining cost is reduced, and the machining and production efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of motors, and in particular relates to a high-speed brushless motor. Background Art

[0002] The common high-speed motors on the market are mainly cantilever beams, and their air ducts and impellers are made of metal through CNC processing. The disadvantages are long processing cycles, high costs, and high noise from the motor. Due to the metal impeller, there is a more obvious metal noise when the motor is shut down. The impeller is made of metal and processed by CNC. The motor includes an air duct casing. Since the impeller is a rotating part and the air duct is a stationary part, there will be a certain gap between the impeller and the air duct to ensure the normal operation of the impeller. The wind comes in from the air inlet, passes through the fan blades on the windward side, and is discharged into the air duct. However, some wind still enters the air duct through the gap between the impeller and the casing. When this part of the wind enters the parallel position of the windward side, there will be a cross-flow phenomenon, which will cause the wind that originally entered the impeller blade to generate turbulence and noise (similar to a whistle). For example, application number 202122993828.X discloses a high-speed brushless motor in which there is a gap between the fan blades and the corresponding positions of the inner wall of the air duct casing; at the same time, the entire air duct casing is an integrated structure, which is difficult to process and has the above-mentioned corresponding defects when in use. Utility Model Content

[0003] The purpose of the utility model is to provide a high-speed brushless motor that can solve at least one of the above problems.

[0004] According to one aspect of the utility model, a high-speed brushless motor is provided, comprising an outer shell, a casing, a stator assembly, a rotor assembly and a wind wheel, wherein the outer shell is sleeved on the outside of the casing, an air duct is formed between the outer shell and the casing, the stator assembly is fixed in the casing, the rotor assembly is arranged in the casing and corresponds to the stator assembly, the wind wheel is arranged at one end of the air duct and corresponds to the air duct, the wind wheel comprises a main body and a baffle, the main body comprises a fan blade, the baffle is circular and is fixed to the outer periphery of the fan blade, the baffle and the main body are an integrally formed structure, and the baffle is located on the inner side of the outer shell.

[0005] The beneficial effects of the utility model are as follows: the body of the wind wheel and the baffle plate adopt an integrally formed structure, and a baffle plate is provided on the outer periphery of the wind blade, so that the wind guided by the wind blade can enter the air duct, and the wind enters the air duct in an orderly manner without turbulence, thus avoiding the phenomenon of air flow cross-flow and greatly reducing noise; by providing an outer shell and a casing, the air duct is composed of an outer shell and an inner shell, which can facilitate the separate forming and processing of the two parts, thereby reducing the processing cost and improving the processing production efficiency.

[0006] In some embodiments, a mounting step is provided on the inner side of one end of the housing, and the baffle is located on the mounting step. Thus, by providing the mounting step, a small amount of airflow formed between the baffle and the side wall of the housing can be blocked to prevent the small amount of airflow from entering the air duct, thereby preventing the formation of airflow cross-flow in the air duct.

[0007] In some embodiments, the rotor assembly includes a rotating shaft, a magnetic ring, a first bearing and a second bearing. The magnetic ring is sleeved on the rotating shaft, corresponding to the stator assembly. One end of the rotating shaft is sleeved on the housing, and the other end passes through the housing and then out. The wind wheel is sleeved on the other end of the rotating shaft. The first bearing and the second bearing are sleeved at the two ends of the rotating shaft and the matching parts of the housing. Thus, the normal working function of the motor is facilitated by various parts of the rotor assembly.

[0008] In some embodiments, a first mounting groove and a second mounting groove are provided on the inner sides of both ends of the housing, the first bearing is located in the first mounting groove, the second bearing is located in the second mounting groove, and the second bearing is located between the wind wheel and the first bearing, thereby facilitating the installation of the first bearing and the second bearing.

[0009] In some embodiments, a high-speed brushless motor further includes a silicone sleeve, which is U-shaped, and is sleeved in the first mounting groove, and the first bearing sleeve is sleeved in the silicone sleeve. Thus, by providing the silicone sleeve, an axial preload can be provided to the bearing to prevent the bearing from moving, thereby eliminating noise, thereby eliminating the existing spring and other matching structures, and being able to better control the preload acting on the bearing, thereby better controlling noise and helping to increase the service life of the motor.

[0010] In some embodiments, the thickness of the side wall and the bottom of the silicone sleeve is 1-5 mm, thereby ensuring the deformation of the silicone sleeve and providing sufficient preload force for the bearing.

[0011] In some embodiments, the stator assembly includes a plastic frame, a stator core and a winding, the plastic frame is fixed in the housing, the stator core is fixed on the plastic frame, the winding is wound on the plastic frame, and the rotating shaft passes through the plastic frame, thereby meeting the use requirements of the motor.

[0012] In some embodiments, one end of the plastic frame is provided with PIN pins, there are four PIN pins, one end of the plastic frame is provided with a mounting hole, the PIN pins are fixed on the mounting hole, and the PIN pins are connected to the winding. Thus, it is convenient to connect with external wires through the PIN pins, and it is helpful to simplify the structure of the entire stator assembly.

[0013] In some embodiments, an air guide plate is provided on the inner side of the housing, and there are multiple air guide plates. The air guide plates are located in the air duct, and the air guide plates and the housing are an integrally formed structure. Thus, the air guide plates facilitate the flow of air in the air duct; the air guide plates and the housing are integrally injection molded, so that they can be molded and processed separately from the housing, which is beneficial to improving the curvature accuracy of the air guide plates, achieving precision injection molding, and reducing production costs.

[0014] In some embodiments, a limiting step is provided on the outer wall of the housing, the top of the air guide plate abuts against the limiting step, and the air guide plate is fixed to the outer side of the housing, thereby facilitating the determination of the relative position between the outer shell and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural schematic diagram of a high-speed brushless motor.

[0016] Figure 2 The utility model is a cross-sectional structural schematic diagram of a high-speed brushless motor.

[0017] Figure 3 The utility model is a structural schematic diagram of a fan wheel in a high-speed brushless motor.

[0018] Figure 4 The utility model is a structural schematic diagram of a housing of a high-speed brushless motor.

[0019] Figure 5 The utility model is a schematic cross-sectional structure diagram of a casing of a high-speed brushless motor.

[0020] Figure 6 The utility model is a structural schematic diagram of the stator assembly and the rotor assembly in a high-speed brushless motor. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] Reference Figure 1 to Figure 6 A high-speed brushless motor includes a housing 1, a casing 2, a stator assembly 3, a rotor assembly 4 and a wind wheel 5. The housing 1 is sleeved on the outer side of the casing 2, and an air duct 6 is formed between the housing 1 and the casing 2. The stator assembly 3 is fixed in the casing 2, the rotor assembly 4 is arranged in the casing 2 and is arranged corresponding to the stator assembly 3, the wind wheel 5 is arranged at one end of the air duct 6 and corresponds to the air duct 6, the wind wheel 5 includes a body 51 and a baffle 52, the body 51 includes a fan blade 511, the baffle 52 is circular and fixed to the outer periphery of the fan blade 511, the baffle 52 and the body 51 are an integrally formed structure, and the baffle 52 is located on the inner side of the housing 1.

[0023] An installation step 11 is formed on the inner side of one end of the housing 1, and the baffle plate 52 is located on the installation step 11. In actual use, the top of the fan blade 511 is flush with or lower than the upper end surface of the baffle plate 52. In this way, it can be ensured that the airflow guided by the fan blade 511 directly enters the air duct 6 to avoid the cross-flow phenomenon.

[0024] When the wind wheel 5 is installed, the baffle plate 52 is located on the installation step 11. Therefore, when the wind wheel 5 rotates at a high speed along with the rotor assembly 4, the airflow enters the air duct 6 under the guiding action of the fan blades 511; there is a very small gap between the baffle plate and the inner wall of the outer shell 1 to ensure that the wind wheel 5 can rotate normally. Since the baffle plate 52 is circular, the airflow generated by the baffle plate 52 is very small when the wind wheel 5 rotates at a high speed, and the airflow cannot enter the air duct 6 due to the blocking action of the installation step 11, thereby ensuring that the airflow in the air duct 6 is guided into the air through the fan blades 511, realizing the orderly entry of the airflow into the air duct 6 without turbulence, thereby avoiding the noise caused by turbulent airflow.

[0025] The rotor assembly 4 includes a rotating shaft 41, a magnetic ring 42, a first bearing 43 and a second bearing 44. The magnetic ring 42 is sleeved on the rotating shaft 41 and corresponds to the stator assembly 3. One end of the rotating shaft 41 is sleeved on the casing 2, and the other end passes through the casing 2 and then comes out. The wind wheel 5 is sleeved on the other end of the rotating shaft 41. The first bearing 43 and the second bearing 44 are respectively sleeved at the two ends of the rotating shaft 41 and the matching parts with the casing 2.

[0026] The first mounting groove 21 and the second mounting groove 22 are provided on the inner sides of both ends of the housing 2, the first bearing 43 is located in the first mounting groove 21, the second bearing 44 is in the second mounting groove 22, and the second bearing 44 is located between the wind wheel 5 and the first bearing 43. The first bearing 43 and the second bearing 44 can ensure the high-speed rotation of the shaft 41, thereby ensuring that the motor can achieve the effect of high-speed rotation, and avoid direct contact with the housing 2, reducing friction. The installation of the corresponding bearings is facilitated by the mounting grooves.

[0027] In the actual assembly process, in order to facilitate the installation of various structures in the housing 2, an end cover is provided at one end of the housing 2, and the first installation groove 21 is opened on the end cover. When the internal structure of the housing 2 is installed, the end cover cooperates with the housing 2 and is fixed to the housing 2 by bonding.

[0028] The utility model of a high-speed brushless motor further includes a silicone sleeve 7, which is U-shaped, and is sleeved in the first mounting groove 21, and the first bearing 43 is sleeved in the silicone sleeve 7. The thickness of the side wall and the bottom of the silicone sleeve 7 are both 1-5 mm, and through this thickness, the silicone sleeve 7 can generate sufficient deformation, provide sufficient axial preload for the two bearings, prevent the two bearings from moving when the rotating shaft 41 rotates, and help reduce noise.

[0029] By sleeved the silicone sleeve 7 on the outer side of the first bearing 43, the first bearing 43 acts on the silicone sleeve 7, so that the silicone sleeve 7 is deformed accordingly. Under the action of the rotating shaft 41, a preload force can be applied to the two bearings to eliminate noise. Compared with the existing common springs providing preload force, this method is difficult to control the natural height of the spring because the overall height of the spring is relatively high, generally around 10mm. If it is too high or too low, the force applied to the bearing will be too large or too small. If the force applied is too large, the balls will roll tightly together, and the friction between the two will generate a lot of heat under high-speed operation. At the same time, severe friction will shorten the service life of the two and generate relatively sharp noise. The silicone sleeve 7 adopted in the present invention is injection-molded by a mold, with better precision control, and can better control the preload force acting on the bearing, thereby better controlling noise and motor life; at the same time, since there is a silicone sleeve 7 between the first bearing 7 and the bearing chamber of the external end cover, a soft connection is achieved. Therefore, when the axes of the two mounting grooves are not in the same straight line, the silicone sleeve 7 also has a self-repairing function and undergoes corresponding deformation, thereby ensuring the coaxiality of the shaft during installation, facilitating the installation of the shaft, thereby reducing noise and extending the service life of the motor.

[0030] The stator assembly 3 includes a rubber frame 31, a stator core 32 and a winding 33. The rubber frame 31 is fixed in the housing 2, the stator core 32 is fixed on the rubber frame 31, the winding 33 is wound on the rubber frame 31, and the rotating shaft 41 passes through the rubber frame 31. Among them, the inner side of the rubber frame 31 is formed with a fixing hole, the stator core 32 is pressed into the corresponding fixing hole for fixing, and then the stator core is covered with rubber; the winding 33 (not shown in the figure) is wound on the rubber frame 31, and the winding method of the winding is the same as the winding method of the winding in the existing motor, and the winding can be three.

[0031] One end of the plastic frame 31 is provided with PIN pins 8, and there are four PIN pins 8. One end of the plastic frame 31 is provided with a mounting hole, and the PIN pins 8 are fixed on the mounting hole, and the PIN pins 8 are connected to the winding 33. The PIN pins 8 are inserted into the mounting hole for fixing, and the PIN pins 8 are connected to the winding. The PIN pins are provided to facilitate the connection with the external wire.

[0032] An air guide plate 9 is provided on the inner side of the housing 1. There are multiple air guide plates 9. The air guide plates 9 are located in the air duct 6. The air guide plates 9 and the housing 1 are an integral injection molding structure. In order to better guide the airflow in the air duct 6, the air guide plates 9 have a certain curvature. The housing 1 and the air guide plates 9 are integrally injection molded, so that the housing 1 and the housing 2 can be molded separately.

[0033] A limiting step 23 is formed on the outer wall of the casing 2, and the top of the air guide plate 9 is in contact with the limiting step 23, and the air guide plate 9 is fixed on the outside of the casing 2. The casing 2 and the outer shell 1 are separately molded, thereby greatly improving the yield rate, and are separately injection molded. Compared with the prior art in which the outer shell and the casing are integrally die-casted, the utility model molds the two separately, which greatly reduces the production costs of both. At the same time, the outer shell 1 and the casing 2 are injection molded separately to achieve the effect of precision injection molding, which is beneficial to improving the curvature accuracy of the air guide plate 9 and reducing the noise of the entire motor. At the same time, the outer shell 1 and the casing 2 are separately molded, and when defective products appear in the casing 2 and the structures inside the casing 2, the outer shell 1 and the air guide plate 9 can be reused, which is beneficial to reducing costs.

[0034] When the outer shell 1 is matched with the casing 1, the outer shell 1 is inserted from one end of the casing 1. When the air guide plate 9 moves to the limiting step 23, the limiting step 23 limits the air guide plate 9. At this time, the outer shell 1 is installed in place on the casing 1, and the side of the air guide plate 9 abuts against the casing 1; then, the air guide plate 9 is bonded and fixed to the casing 1 by gluing, thereby realizing the fixed connection between the outer shell 1 and the casing 2.

[0035] The above are only preferred implementations of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-speed brushless motor, characterized in that: The invention comprises an outer shell (1), a casing (2), a stator assembly (3), a rotor assembly (4) and a wind wheel (5), wherein the outer shell (1) is sleeved on the outer side of the casing (2), an air duct (6) is formed between the outer shell (1) and the casing (2), the stator assembly (3) is fixed in the casing (2), the rotor assembly (4) is arranged in the casing (2) and is arranged corresponding to the stator assembly (3), the wind wheel (5) is arranged at one end of the air duct (6) and corresponds to the air duct (6), the wind wheel (5) comprises a body (51) and a baffle (52), the body (51) comprises a fan blade (511), the baffle (52) is circular and is fixed on the outer periphery of the fan blade (511), the baffle (52) and the body (51) are an integrally formed structure, and the baffle (52) is located on the inner side of the outer shell (1).

2. A high-speed brushless motor according to claim 1, characterized in that: An installation step (11) is provided on the inner side of one end of the housing (1), and the baffle plate (52) is located on the installation step (11).

3. A high-speed brushless motor according to claim 2, characterized in that: The rotor assembly (4) comprises a rotating shaft (41), a magnetic ring (42), a first bearing (43) and a second bearing (44); the magnetic ring (42) is sleeved on the rotating shaft (41) and corresponds to the stator assembly (3); one end of the rotating shaft (41) is sleeved on the casing (2), and the other end passes through the casing (2) and then comes out; the wind wheel (5) is sleeved on the other end of the rotating shaft (41); and the first bearing (43) and the second bearing (44) are respectively sleeved at the matching positions of the two ends of the rotating shaft (41) and the casing (2).

4. A high-speed brushless motor according to claim 3, characterized in that: A first mounting groove (21) and a second mounting groove (22) are provided on the inner sides of both ends of the housing (2); the first bearing (43) is located in the first mounting groove (21); the second bearing (44) is located in the second mounting groove (22); and the second bearing (44) is located between the wind wheel (5) and the first bearing (43).

5. A high-speed brushless motor according to claim 4, characterized in that: It also includes a silicone sleeve (7), the silicone sleeve (7) is U-shaped, the silicone sleeve (7) is sleeved in the first installation groove (21), and the first bearing (43) is sleeved in the silicone sleeve (7).

6. A high-speed brushless motor according to claim 5, characterized in that: The thickness of the side wall and the bottom of the silica gel sleeve (7) are both 1 to 5 mm.

7. A high-speed brushless motor according to any one of claims 3 to 6, characterized in that: The stator assembly (3) comprises a rubber frame (31), a stator core (32) and a winding (33); the rubber frame (31) is fixed in the housing (2); the stator core (32) is fixed on the rubber frame (31); the winding (33) is wound on the rubber frame (31); and the rotating shaft (41) passes through the rubber frame (31).

8. A high-speed brushless motor according to claim 7, characterized in that: One end of the rubber frame (31) is provided with PIN needles (8), and there are four PIN needles (8). One end of the rubber frame (31) is provided with mounting holes, and the PIN needles (8) are fixed on the mounting holes. The PIN needles (8) are connected to the windings (33).

9. A high-speed brushless motor according to claim 7, characterized in that: An air guide plate (9) is provided on the inner side of the outer shell (1), and the air guide plates (9) are multiple. The air guide plates (9) are located in the air duct (6), and the air guide plates (9) and the outer shell (1) are an integrally formed structure.

10. A high-speed brushless motor according to claim 9, characterized in that: A limiting step (23) is provided on the outer wall of the casing (2), the top end of the air guide plate (9) abuts against the limiting step (23), and the air guide plate (9) is fixed on the outer side of the casing (2).

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