CN212850017U

CN212850017U - Brushless coreless cup fan motor

Info

Publication number: CN212850017U
Application number: CN202021759907.3U
Authority: CN
Inventors: 瞿广莉
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-03-30
Anticipated expiration: 2030-08-21

Abstract

The utility model relates to the technical field of motors, specifically be a brushless coreless fan motor. The rotor assembly comprises a rotor assembly body, a shell, a tail cover, a rear bearing and a stator assembly. Stator module installs in the casing, and the rotor subassembly inserts from the stator module center, is supported by front bearing and rear bearing, installs in the casing, and casing afterbody connection tail-hood seals. The rotor assembly is assembled into a whole by the fan blade, the shaft, the front bearing, the front balancing weight, the magnetic steel and the rear balancing weight. The shell is composed of an outer cylindrical shell and an inner cylindrical shell, the shell and the cylindrical shell are connected into a whole through a support, and a front bearing chamber is arranged in the front end face of the cylindrical shell and used for accommodating and placing a front bearing. The tail cover is arranged at the tail part of the barrel body, and a rear bearing chamber is arranged in the middle of the tail cover and used for accommodating and placing a rear bearing. The stator assembly is sequentially nested from outside to inside by a circular silicon steel sheet sleeve, a frameless coreless coil and an insulation bushing to form a cylinder shape, and an insulation support ring is arranged at the rear end of the stator assembly.

Description

Brushless coreless cup fan motor

Technical Field

The utility model relates to the technical field of motors, specifically be a brushless coreless fan motor.

Background

The brushless coreless motor belongs to a miniature permanent magnet motor type, and has a special structure that a coil winding is a skeleton-free enameled wire self-supporting hollow cylindrical structure, the performance parameters of the motor formed by the special structure are the types with the highest power density and the highest efficiency of various motors with the same specification, and the brushless coreless motor has application advantages of substitutability in various high-end applications such as the fields of precision control, aerospace, military science and technology, medical science and technology and the like.

In the high-rotating-speed application field, the slotless structure of the brushless coreless motor ensures that the iron loss is very low, so the brushless coreless motor has high running efficiency and very outstanding application advantages, and is very suitable for axial-flow duct type fans with more than 10 thousands of turns. However, since the rotor rotates at a high speed, particularly at a rotational speed of 10 ten thousand rpm or more, the dynamic balance of the rotor is required to be very high, and otherwise, vibration generated when the motor operates at a high rotational speed and high-frequency noise caused by the vibration cannot be accepted by users.

At present, the dynamic balancing machine with higher precision can reach the dynamic balancing correction value of a motor rotor within 1 milligram, on one hand, the equipment is expensive, meanwhile, the production process is very time-consuming for obtaining better dynamic balancing performance, and on the other hand, even if the unbalance amount is 1 milligram, the motor still can cause more obvious vibration and high-frequency noise.

In the field of high-voltage application, a brushless coreless motor is influenced by a cylindrical coil manufacturing process, the insulation of an enameled wire has a damage hidden danger, the follow-up processes such as paint dipping and glue pouring are used for making up, and the insulation treatment of the coil and peripheral metal parts still needs to be further enhanced.

Disclosure of Invention

The utility model discloses the main objective designs a coreless motor, vibration and noise that dynamic balance caused when further eliminating the brushless coreless motor of high rotational speed that the output shaft does not have radial external force and applying to and when high voltage applies, further strengthen coil and peripheral metal parts's insulating nature.

The utility model provides a brushless coreless fan motor, includes rotor subassembly, casing, tail-hood, rear bearing, stator module, and stator module installs in the casing, and the rotor subassembly inserts from the stator module center, is supported by front bearing and rear bearing, installs in the casing, and casing afterbody connection tail-hood seals.

The rotor assembly is assembled into a whole by the fan blade, the shaft, the front bearing, the front balancing weight, the magnetic steel and the rear balancing weight. The front end of the shaft is provided with a fan blade, the rear part of the shaft is close to the fan blade and is provided with a front bearing, the middle section of the shaft is sleeved with a layer of magnetic steel, the front end of the magnetic steel is provided with a front balancing weight, and the rear end of the magnetic steel is provided with a rear balancing weight. The middle of the tail cover is provided with a rear bearing chamber for accommodating and placing a rear bearing, and a shaft of the rotor assembly is supported by the front bearing and the rear bearing and is arranged in the shell.

The shell is composed of an outer cylindrical shell and an inner cylindrical shell, and the shell and the cylindrical shell are connected into a whole through a support and are an integral injection molding piece or a die casting piece. The inside one section cavity that is of shell front end holds and places the fan blade, and the terminal surface is located the shell before the barrel, sets up the front bearing room in the terminal surface before the barrel, holds and places the front bearing. The tail cover is a plastic part and is arranged at the tail part of the barrel, and a rear bearing chamber is arranged in the middle of the tail cover and used for accommodating and placing a rear bearing. The stator assembly is characterized in that a circular silicon steel sheet sleeve, a frameless coreless cup coil and an insulating bush are sequentially nested from outside to inside to form a cylinder, an insulating support ring is arranged at the rear end of the stator assembly, and a PCB is arranged at the rear end of the insulating support ring.

The tail of the barrel is provided with a plurality of notches, the outer edge of the tail cover is provided with corresponding bulges, and the notches and the bulges are matched to facilitate positioning and assembling of the tail cover and the barrel.

The bottom of the front bearing chamber is provided with a front bearing limiting step for limiting the installation position of the front bearing, and the inner wall of the cylinder body is provided with a stator limiting step for limiting the installation position of the stator assembly in the cylinder body. The arrangement of the limiting steps enables the installation to be accurate limiting assembly.

The front end face of the barrel is provided with a plurality of front end vent holes, and the end face extends towards the barrel to form a radian. The tail cover is provided with a plurality of rear end vent holes. The front vent hole and the rear vent hole form an airflow channel on the surface of the motor rotor, so that the internal better heat dissipation condition of the motor is met, and the motor is ensured to run more stably.

The utility model adopts the integral rotor assembly which integrates the front bearing, the rotor magnetic steel, the balancing weight and the fan blade, and then carries out the dynamic balance process, thus ensuring one process and one set of equipment to meet the requirements of high precision dynamic balance and high rotating speed and low noise; compared with the method that the magnetic steel is dynamically balanced and then the fan blade is dynamically balanced again, two processes and two sets of equipment are needed, and the method is very optimal. And an insulating bush is added on the inner wall of the stator coil, so that the electric arc hidden trouble of the coil and the metal rotor is thoroughly eliminated. The insulating support ring is added at the tail end of the silicon steel sheet sleeve, the PCB is arranged on the insulating support ring, electric arc hidden dangers of welding spots on the PCB and surrounding metal components are thoroughly eliminated, the use safety of the motor is ensured, and especially the safety requirement of the application environment similar to 220V commercial power is met.

Drawings

Fig. 1 is a schematic structural view of the present invention; FIG. 2 is a schematic view of a rotor assembly; FIG. 3 is a schematic view of a stator assembly configuration; FIG. 4 is a schematic view of the housing structure; FIG. 5 is a schematic structural diagram of the front end face of the housing; FIG. 6 is a schematic view of the tail cap structure; fig. 7 is a schematic structural diagram of a front section of the tail cover.

Detailed Description

The invention will be further described with reference to the following specific embodiments and the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting of the invention.

Example (b): a brushless coreless fan motor is composed of a rotor assembly 1, a shell 2, a tail cover 3, a rear bearing 4 and a stator assembly 5, wherein the stator assembly 5 is installed in the shell 2, the rotor assembly 1 is inserted into the shell 2 from the center of the stator assembly 5 and is supported by a front bearing 1.3 and the rear bearing 4 which are arranged on the rotor assembly, and the tail of the shell 2 is connected with the tail cover 3 for sealing, as shown in figure 1.

As shown in fig. 2, the rotor assembly 1 is assembled by a fan blade 1.1, a shaft 1.2, a front bearing 1.3, a front balancing weight 1.4, magnetic steel 1.5 and a rear balancing weight 1.6 into a whole. The front end of the shaft 1.2 is provided with a fan blade 1.1, the rear part of the shaft is close to the fan blade 1.1, a front bearing 1.3 is arranged, the middle section of the shaft 1.2 is sleeved with a layer of magnetic steel 1.5, the front end of the magnetic steel 1.5 is provided with a front balancing weight 1.4, and the rear end of the magnetic steel 1.5 is provided with a rear balancing weight 1.6.

As shown in fig. 3, the stator assembly 5 is formed by sequentially nesting a circular silicon steel sheet sleeve 5.1, a frameless coreless coil 5.2 and an insulating bush 5.3 from outside to inside to form a cylinder, an insulating support ring 5.4 is arranged at the tail end of the stator assembly 5, namely the tail end of the silicon steel sheet sleeve 5.1, and a PCB 5.7 is arranged at the rear end of the insulating support ring 5.4. The lead wire of coil is connected to the PCB board, connects on the PCB board and stretches out motor lead wire 5.5 to the motor outside, and motor lead wire 5.5 terminal sets up lead wire plug 5.6.

As shown in fig. 4 and 5, the housing 2 is composed of an outer cylindrical shell 2.1 and an inner cylindrical body 2.6, and the shell 2.1 and the cylindrical body 2.6 are connected integrally by a bracket 2.2. The inside of the front end of the shell 2.1 is a section of cavity for accommodating the fan blade 1.1 for placing the rotor assembly 1. The front end face 2.8 of the cylinder is located in the shell 2.1, a front bearing chamber 2.4 is arranged in the front end face 2.8 of the cylinder and used for containing a front bearing 1.3, and a front bearing limiting step 2.41 is arranged at the bottom of the front bearing chamber 2.4 and used for limiting the installation position of the front bearing 1.3. A plurality of front end vent holes 2.3 are arranged on the front end surface 2.8 of the cylinder body, and the end surface extends towards the cylinder body to form a radian. The inner wall of the cylinder 2.6 is provided with a stator limiting step 2.5 for limiting the installation position of the stator assembly 5 in the cylinder 2.6. The tail part of the cylinder body 2.6 is provided with a plurality of notches 2.7 which are used for being matched with the bulges 3.1 on the tail cover 3 for assembly.

As shown in fig. 6 and 7, the tail cover 3 is made of plastic and is mounted at the tail of the cylinder 2.6, and a rear bearing chamber 3.3 is arranged in the middle of the tail cover 3 and is provided with a rear bearing 4. The corresponding bulge 3.1 is arranged on the outer edge of the tail cover 3 and is matched with the notch 2.7 arranged at the tail part of the cylinder body 2.6, and the tail cover 3 is arranged on the rear end face of the cylinder body. A plurality of rear end vent holes 3.2 are formed in the tail cover 3, and a plurality of front end vent holes 2.3 are formed in the front end face 2.8 of the cylinder body, so that an airflow channel on the surface of the motor rotor is formed, the heat dissipation performance is improved, and the stable operation of the motor is ensured.

In the brushless coreless fan motor, the stator assembly 5 is assembled into the cylinder 2.6 from the tail part of the shell 2 and is inserted into the position of the stator limiting step 2.5. The rotor assembly 1 is inserted from the head of the shell 2, the front bearing 1.3 is inserted into the front bearing chamber 2.4 to the position of the front bearing limit step 2.41, the tail end of the shaft 1.2 of the rotor assembly 1 is connected with the rear bearing 4 in the tail cover 3, and the tail cover 3 is covered on the tail part of the barrel 2.6.

Brushless coreless fan motor, rotor subassembly 1, casing 2, stator module 5, tail-hood 3 all design into the equipment structure as an organic whole, make motor rigging equipment, process retrench the optimization more, have improved efficiency, guaranteed simultaneously that the rotor has higher dynamic balance degree performance, vibration and high frequency noise that produce when reducing the high rotational speed operation of motor make the motor operation more high-efficient. The insulating design structure of the insulating bush is added on the inner wall of the stator coil, so that the insulating property between the coil and the rotor and the running reliability of the motor are greatly improved.

Claims

1. A brushless coreless fan motor comprises a rotor assembly (1), a shell (2), a tail cover (3), a rear bearing (4) and a stator assembly (5), wherein the stator assembly (5) is installed in the shell (2), the rotor assembly (1) is inserted from the center of the stator assembly (5) and is supported by the front bearing (1.3) and the rear bearing (4) and is installed in the shell (2), the tail part of the shell (2) is connected with the tail cover (3), the brushless coreless fan motor is characterized in that the rotor assembly (1) is integrally assembled by a fan blade (1.1), a shaft (1.2), a front bearing (1.3), a front balancing weight (1.4), a magnetic steel (1.5) and a rear balancing weight 1.6, the front end of the shaft (1.2) is provided with a fan blade (1.1), the rear part of the shaft is close to the fan blade (1.1), the front bearing (1.3) is arranged, a layer of magnetic steel (1.5) is sleeved outside the middle section of the shaft (1.2), and, a rear balancing weight (1.6) is arranged at the rear end of the magnetic steel (1.5); the shell (2) is composed of an outer cylindrical shell (2.1) and an inner cylinder (2.6), the shell (2.1) and the cylinder (2.6) are connected into a whole through a support (2.2) and are an integral injection molding part or a die casting part, a section of cavity is arranged inside the front end of the shell (2.1) and used for accommodating and placing the fan blade (1.1), the front end face (2.8) of the cylinder is positioned in the shell (2.1), and a front bearing chamber (2.4) is arranged in the front end face (2.8) of the cylinder and used for accommodating and placing a front bearing (1.3); the tail cover (3) is a plastic piece and is arranged at the tail part of the cylinder body (2.6), and a rear bearing chamber (3.3) is arranged in the middle of the tail cover (3) and is used for accommodating and placing a rear bearing (4); stator module (5) outside-in is nested by ring shape silicon steel sheet cover (5.1), no skeleton coreless cup coil (5.2), insulating bush (5.3) in proper order and is constituted the cylinder, sets up insulating support ring (5.4) at stator module (5) rear end, and insulating support ring (5.4) rear end sets up PCB board (5.7).

2. A brushless coreless fan motor according to claim 1, wherein the front bearing chamber (2.4) is provided with a front bearing stop step (2.41) at the bottom, defining a front bearing (1.3) mounting position.

3. A brushless coreless fan motor as claimed in claim 1, wherein a plurality of front vent holes (2.3) are provided in a front end face (2.8) of the barrel, the end face extending in a curvature towards the barrel.

4. A brushless coreless fan motor as claimed in claim 1, wherein the inner wall of the barrel (2.6) is provided with a stator retention step (2.5) defining a mounting position of the stator assembly (5) within the barrel (2.6).

5. A brushless coreless fan motor as claimed in claim 1, wherein the barrel (2.6) is provided with a plurality of notches (2.7) at its rear end, and the tail cover (3) is provided with corresponding protrusions (3.1) at its outer edge, and the notches and the protrusions cooperate to mount the tail cover (3) on the rear end face of the barrel.

6. A brushless coreless fan motor according to claim 1, wherein the tail cap (3) is provided with a plurality of rear end vents (3.2).