A fan motor

Abstract

The application provides a fan motor, which comprises a rotor assembly, a casing assembly, a rear end cover, a circuit board assembly, a plurality of circuit board substrates, a plurality of mounting plates, a plurality of radial springs, a plurality of buffer blocks, a buffer sleeve and a shock pad, the circuit board substrates are respectively mounted on the mounting plates, the buffer sleeve is sleeved on a motor shaft, the shock pad is fixedly mounted between the casing and the rear end cover, the buffer blocks are arranged along the circumference of the fan motor, each buffer block is fixed on a C-shaped hook, the shock pad is provided with a clamping groove for clamping the C-shaped hook, one end of the radial spring is fixedly connected to the outer end of the buffer block, the outer end of the mounting plate is provided with an L-shaped bending part, and the other end of the radial spring is connected to the inner side of the L-shaped bending part. The fan motor of the application can reduce the vibration transmitted to the printed circuit board to a small value, and can avoid the printed circuit board from being impacted by large vibration and causing the soldering point to fall off.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and in particular relates to a fan motor. Background Technology

[0002] An electric motor used to circulate air inside and outside a device is called a fan motor. In the prior art, stepper motors are often used as fan motors. A stepper motor is an electric motor that converts electrical pulse signals into corresponding angular or linear displacement. Improperly driving a stepper motor can easily lead to a "humming" noise and significant vibration. Stepper motors provide precise position control by combining small "steps" of specific rotational angles, without the aid of an encoder. However, they exhibit minute vibrations between steps. While these vibrations are mostly unobservable, they do translate into noise, which can be amplified by other mechanisms connected to the motor.

[0003] Chinese patent document CN109067031A discloses a vibration-damping rotor core, a vibration-damping rotor, and a motor. The vibration-damping rotor core includes an inner rotor core and an outer rotor core. The outer rotor core can be fitted around the outer circumference of the inner rotor core, and a vibration-damping space for accommodating vibration-damping material can be formed between the inner and outer rotor cores. A first groove is formed radially on the inner rotor core, and a second groove is also formed radially on the outer rotor core. The first groove and the second groove can be positioned opposite each other. A bridging core is also included, which can simultaneously pass through the first and second grooves to form a circumferential relative positioning of the inner and outer rotor cores. This invention can achieve circumferential positioning of the vibration-damping material, strengthen the tangential force of the vibration-damping material on the circumference, prevent the vibration-damping material from falling off under stress, ensure rotor reliability during high-speed rotation, and enhance motor reliability.

[0004] The shortcomings of this technical solution are as follows: While printed circuit boards (PCBs) are typically housed within the fan motor housing for motor control, in this solution, the gaps between the bridging core and the outer rotor are filled with vibration-damping material to form a vibration-damping rotor. This necessitates optimized design of the PCB mounting structure to mitigate the impact of the vibration-damping material. Furthermore, during fan motor operation, vibrations from the rotor and motor shaft are easily transmitted to the PCB, causing solder joints on electronic components to detach and ultimately damaging the motor. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems and provides a fan motor designed to reduce the vibration transmitted from the rotor and motor shaft to the printed circuit board.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A fan motor includes a rotor assembly, a housing assembly, and a circuit board assembly. The housing assembly includes a housing and a stator. The rotor assembly includes a rotor and a motor shaft. The stator is fixedly installed inside the housing, and the rotor is fixedly installed on the motor shaft. The circuit board assembly includes a plurality of circuit board substrates, a plurality of mounting plates, a plurality of radial springs, a plurality of buffer blocks, and a buffer sleeve. The buffer sleeve is fitted onto the motor shaft. The plurality of buffer blocks are disposed on the outer periphery of the buffer sleeve and arranged along the circumferential direction of the fan motor. Each mounting plate is connected to a buffer block through a radial spring, and the radial spring is arranged along the radial direction of the fan motor. The circuit board substrate is mounted on each mounting plate.

[0007] As a preferred technical solution, the circuit board assembly further includes a shock-absorbing pad and a right end cover. The shock-absorbing pad is fixedly installed between the housing and the rear end cover. Each buffer block is fixed on a C-shaped hook of the buffer block. The shock-absorbing pad is provided with a slot for engaging the C-shaped hook.

[0008] As a preferred technical solution, one end of the radial spring is fixedly connected to the outer end of the buffer block, the outer end of the mounting plate is provided with an L-shaped bend, and the other end of the radial spring is connected to the inner side of the L-shaped bend.

[0009] As a preferred technical solution, a chordal spring is provided between two adjacent buffer blocks, and the two ends of the chordal spring are fixedly connected to the two buffer blocks respectively.

[0010] As a preferred technical solution, the buffer sleeve includes an outer sleeve and an inner sleeve, the inner sleeve is fitted onto the motor shaft, and the outer sleeve is fitted onto the outside of the inner sleeve.

[0011] As a preferred technical solution, the outer sleeve is provided with several outwardly protruding hook grooves in the circumference. The outer sleeve and the shock-absorbing pad are connected by an outer sleeve C-shaped hook. One end of the outer sleeve C-shaped hook is engaged in the hook groove, and the other end of the outer sleeve C-shaped hook is engaged on the shock-absorbing pad.

[0012] As a preferred technical solution, the fan motor further includes a front cover and a front cover baffle / rear cover, and the rotor assembly further includes the front bearing and the rear bearing. The front cover is in the shape of an annular disc and is fixedly installed at the front end of the housing. The rear cover is in the shape of a disc and is fixedly installed at the rear end of the housing. The rear cover has a rearwardly recessed rear bearing mounting groove in the middle, and the rear bearing is installed in the rear bearing mounting groove. The middle of the front cover is bent inward to form a front bearing mounting part, and the front bearing is installed in the front bearing mounting part and has an interference fit with the front bearing mounting part. The front cover baffle is fixedly installed in the middle of the front of the front cover by bolts, so that the outer ring of the front bearing abuts against the front cover baffle.

[0013] As a preferred technical solution, the front end of the motor shaft extends forward relative to the front end cover, and the extended portion of the motor shaft is equipped with a radially arranged elastic pin tube.

[0014] As a preferred technical solution, the inner sleeve is made of a cushioning material, and the outer sleeve is made of a rigid material.

[0015] As a preferred technical solution, By adopting the above technical solution, the present invention has the following advantages: In this invention, the vibration of the motor shaft and rotor is transmitted to the buffer sleeve. After being damped by the buffer sleeve, the vibration is transmitted to the buffer block, and then damped by the buffer block. On one hand, the vibration is transmitted to the radial spring, and after being damped by the radial spring, it is transmitted to the mounting plate. On the other hand, the vibration is transmitted to the damping pad, and after being damped by the damping pad, it is dissipated to the ground through the housing. Because the vibration transmitted from the motor shaft and rotor to the mounting plate and circuit board substrate is first damped by the buffer sleeve, then by the buffer block and the radial spring, and finally transmitted to the mounting plate and circuit board substrate, the circuit board substrate is relatively stable during motor rotation, making it less likely for the solder joints of electronic components to fall off, thus ensuring the service life of the motor. Attached Figure Description

[0016] Figure 1 This is a front view of a fan motor; Figure 2 This is a rear view of a fan motor; Figure 3 This is a side view of a fan motor; In the diagram: 1-Motor shaft; 2-Elastic pin tube; 3-Front end cover baffle; 4-Front end cover; 5-Front bearing; 6-Rotor; 7-Stator; 8-Housing; 9-Inner sleeve; 10-Outer sleeve; 11-Buffer block; 12-Radial spring; 13-Mounting plate; 14-Shock damping pad; 15-Rear bearing; 16-Rear end cover; 17-C-shaped hook; 18-Guide post; 19-Chord spring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1-3 As shown, a fan motor includes: a rotor assembly, a housing assembly, a front cover 4, a front cover baffle 3, a rear cover 16, and a circuit board assembly. The rotor assembly includes a rotor 6, a motor shaft 1, a front bearing 5, and a rear bearing 15. The housing assembly includes a housing 8 and a stator 7.

[0019] The housing 8 is cylindrical, and the stator 7 is fixedly installed inside the housing 8. The front cover 4 is annular and is fixedly installed at the front end of the housing 8. The rear cover 16 is disc-shaped and is fixedly installed at the rear end of the housing 8.

[0020] The rear end cover 16 has a recessed rear bearing mounting groove in its center, and the rear bearing 15 is installed in the rear bearing mounting groove. The front end cover 4 is bent inward in its center to form a front bearing mounting part, and the front bearing 5 is installed in the front bearing mounting part and is interference-fitted with the front bearing mounting part. The rotor 6 is mounted on the motor shaft 1, and the motor shaft 1 is rotatably connected to the front bearing 5 and the rear bearing 15. The front end cover baffle 3 is fixedly installed in the center of the front end cover 4 by bolts, so that the outer ring of the front bearing 5 abuts against the front end cover baffle 3.

[0021] The front end of the motor shaft 1 extends forward relative to the front end cover 4, and the extended part of the motor shaft 1 is equipped with a radially arranged elastic pin tube 2.

[0022] The circuit board assembly includes several circuit board substrates (not shown in the figure), several mounting plates 13, several radial springs 12, several buffer blocks 11, buffer sleeves, and shock-absorbing pads 14. The circuit board substrates are used to mount electronic components, and the electronic components are connected to each other via flexible flat cables. The several circuit board substrates are respectively mounted on the several mounting plates 13. In this embodiment, there are four mounting plates 13, each used to mount its corresponding circuit board substrate. Multiple circuit board substrates can also be mounted on a single mounting plate 13.

[0023] The buffer sleeve includes an outer sleeve 10 and an inner sleeve 9. The inner sleeve 9 is fitted onto the motor shaft 1, and the outer sleeve 10 is fitted onto the outside of the inner sleeve 9. The inner sleeve 9 is made of a cushioning material. The outer sleeve 10 is made of a rigid material.

[0024] The damping pad 14 is fixedly installed between the housing 8 and the rear end cover 16, with a gap between the damping pad 14 and the outer sleeve 10. Several buffer blocks 11 are arranged circumferentially along the fan motor, each buffer block 11 being fixed to a buffer block C-shaped hook 17. The damping pad 14 has a slot for engaging the C-shaped hook 17. The vibration of the motor shaft 1 and rotor 6 is transmitted to the buffer sleeve. After being damped by the buffer sleeve, the vibration is transmitted to the buffer block 11. After being damped by the buffer block 11, the vibration is transmitted to the radial spring 12, and then to the mounting plate 13. Simultaneously, the vibration is transmitted to the damping pad 14, and after being damped by the damping pad 14, it is dissipated to the ground through the housing 8.

[0025] One end of the radial spring 12 is fixedly connected to the outer end of the buffer block 11, and the outer end of the mounting plate 13 is provided with an L-shaped bend. The other end of the radial spring 12 is connected to the inner side of the L-shaped bend. The radial spring 12 serves to buffer and dampen the buffer block 11 and the mounting plate 13. A guide post 18 is fixedly provided on the housing 8, and a guide sleeve is integrally fixed to the outer end of the mounting plate 13. The guide sleeve is fitted onto the guide post 18 and can move along the guide post 18. In this embodiment, the guide post 18 is set as a straight strip. When relative movement occurs between the mounting plate 13 and the housing 8, the mounting plate 13 will only move radially along the direction of the guide post 18, ensuring that the radial spring 12 is subjected to axial force.

[0026] The outer sleeve has several protruding hook grooves in its circumference. The outer sleeve and the shock-absorbing pad are connected by an outer sleeve C-shaped hook. One end of the outer sleeve C-shaped hook is engaged in the hook groove, and the other end of the outer sleeve C-shaped hook is engaged on the shock-absorbing pad.

[0027] Because the vibration transmitted from the motor shaft 1 and rotor 6 to the mounting plate 13 and circuit board substrate is: first through the damping of the buffer sleeve, then through the damping of the buffer block 11 and radial spring 12, and finally transmitted to the mounting plate 13 and circuit board substrate, the circuit board substrate is relatively stable during the motor rotation, making it less likely for the solder joints of electronic components to fall off, thus ensuring the service life of the motor.

[0028] A chordal spring 19 is provided between two adjacent buffer blocks 11, with both ends of the chordal spring 19 fixedly connected to the two buffer blocks 11 respectively. The chordal spring 19 serves two purposes: circumferential damping of the buffer blocks 11 and connection and support between the buffer blocks 11. If the buffer blocks 11 are integrally formed, they will deform as a whole under stress due to internal forces. This deformation is often uneven due to uneven stress distribution, which may affect the motor's counterweight and cause more severe vibration. By setting the buffer blocks as several dispersed individuals, these buffer blocks 11 are arranged circumferentially along the buffer sleeve. Since each buffer block 11 is suspended from the damping pad 14 by a C-shaped hook 17, it can be ensured that even if the buffer block 11 deforms, the circumferential counterweight of the motor remains largely unchanged.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fan motor, comprising a rotor assembly, a housing assembly, and a circuit board assembly, characterized in that, The housing assembly includes a housing and a stator. The rotor assembly includes a rotor and a motor shaft. The stator is fixedly installed inside the housing, and the rotor is fixedly installed on the motor shaft. The circuit board assembly includes several circuit board substrates, several mounting plates, several radial springs, several buffer blocks, and a buffer sleeve. The buffer sleeve is fitted onto the motor shaft. The several buffer blocks are disposed on the outer periphery of the buffer sleeve and are distributed along the circumference of the fan motor. Each mounting plate is connected to the buffer block through the radial spring. The radial spring is arranged along the radial direction of the fan motor. The circuit board substrate is mounted on each mounting plate. The circuit board assembly also includes a shock-absorbing pad, and the fan motor also includes a right end cover. The shock-absorbing pad is fixedly installed between the housing and the right end cover. Each buffer block is fixed on a buffer block C-shaped hook. The shock-absorbing pad is provided with a slot for engaging the C-shaped hook. Each buffer block is suspended on the shock-absorbing pad by the C-shaped hook. A chordal spring is provided between two adjacent buffer blocks, and the two ends of the chordal spring are fixedly connected to the two buffer blocks respectively. The buffer sleeve includes an outer sleeve and an inner sleeve. The inner sleeve is fitted onto the motor shaft, and the outer sleeve is fitted onto the outside of the inner sleeve. The outer sleeve has several protruding hook grooves in its circumference. The outer sleeve and the shock-absorbing pad are connected by an outer sleeve C-shaped hook. One end of the outer sleeve C-shaped hook is engaged in the hook groove, and the other end of the outer sleeve C-shaped hook is engaged on the shock-absorbing pad.

2. A fan motor according to claim 1, characterized in that, One end of the radial spring is fixedly connected to the outer end of the buffer block, the outer end of the mounting plate is provided with an L-shaped bend, and the other end of the radial spring is connected to the inner side of the L-shaped bend.

3. A fan motor according to claim 1, characterized in that, The fan motor further includes a front cover, a front cover baffle, and a rear cover. The rotor assembly further includes a front bearing and a rear bearing. The front cover is in the shape of an annular disc and is fixedly installed at the front end of the housing. The rear cover is in the shape of a disc and is fixedly installed at the rear end of the housing. The rear cover has a rearwardly recessed rear bearing mounting groove in the middle, and the rear bearing is installed in the rear bearing mounting groove. The middle of the front cover is bent inward to form a front bearing mounting part, and the front bearing is installed in the front bearing mounting part and is interference-fitted with the front bearing mounting part. The front cover baffle is fixedly installed in the middle of the front of the front cover by bolts, so that the outer ring of the front bearing abuts against the front cover baffle.

4. A fan motor according to claim 3, characterized in that, The front end of the motor shaft extends forward relative to the front end cover, and the extended portion of the motor shaft is fitted with a radially arranged elastic pin tube.

5. A fan motor according to claim 1, characterized in that, The inner sleeve is made of cushioning material, and the outer sleeve is made of rigid material.

Images