Fan blade assembly structure for inner rotor brushless motor

Abstract

The utility model relates to the technical field of motor rotor assemblies, and discloses a fan blade assembly structure for an inner rotor brushless motor, which comprises engineering plastic material fan blades, a metal lining is connected inside the engineering plastic material fan blades, the engineering plastic material fan blades and the metal lining form a fan blade assembly, the inner wall of the fan blade assembly is connected with the outer wall of a motor shaft, and the inner wall of the fan blade assembly is connected with the outer wall of the motor shaft. The outer wall of the motor shaft is connected with the inner wall of the first ball bearing, the outer wall of the motor shaft is connected with the inner wall of the rotor iron core, a magnet is connected in a rotor iron core groove, the outer wall of the motor shaft is connected with the inner wall of the rear balance block, and the outer wall of the motor shaft is connected with the inner wall of the second ball bearing. According to the fan blade assembly structure for the inner rotor brushless motor, the effect of a front balance block and fan blades in a rotor assembly is structurally replaced, the contact area between the front balance block and the motor shaft is enlarged, the problem that the retention force between the front balance block and the motor is insufficient is solved, and meanwhile the production efficiency of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotor components, in particular to a fan blade component structure for an inner rotor brushless motor. Background Art

[0002] The brushless DC motor consists of a motor body and a driver, and is a typical mechatronics product. Since the brushless DC motor is operated in an automatic manner, it does not require an additional starting winding on the rotor like a synchronous motor that starts under heavy load under variable frequency speed regulation, nor does it produce oscillation and loss of step when the load changes suddenly.

[0003] The Chinese patent with the announcement number CN207124527U disclosed a rotor assembly structure of a brushless vacuum cleaner inner rotor motor, including a housing, a rotor assembly, a fan cover, a stator and a moving impeller, wherein the rotor assembly is installed between the housing and the stator, the fan cover is located above the moving impeller, and the moving impeller is located above the stator, and the rotor assembly includes a rotor core, a drive shaft, a front bearing, a rear bearing and a spring; the rotor core is fixedly connected to the drive shaft; the front bearing is sleeved above the drive shaft, and the rear bearing is sleeved below the drive shaft. The rear bearing of the utility model is loosely matched with the drive shaft and a spring is added between the rear bearing and the rotor core, and the front bearing is tightly matched with the drive shaft and the stator, so that the axial distance of the bearing can be freely changed when it shrinks or stretches due to the elastic force of the spring, so that when the whole machine is assembled, there will be no axial tight motor stuck or axial loose shaft movement virtual position during assembly, because the moving impeller and the rotor are integrated, and the virtual position will cause the moving impeller to move up and down to interfere with the fan cover or the stator.

[0004] However, the front balance block of the rotor assembly structure of the inner rotor motor of the brushless vacuum cleaner is fixed by an interference fit between the front balance block and the motor shaft. Due to errors in processing, manufacturing, and assembly of the front balance block and the shaft, the thickness of the front balance block and the contact area of ​​the interference fit of the motor shaft are limited, resulting in insufficient holding force between the front balance block and the motor shaft. In addition, the vibration and impact of the motor working environment are relatively large, which causes the front balance block of the rotor to fall off. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the utility model provides a fan blade assembly structure for an inner rotor brushless motor. Its advantages are that it can replace the functions of the front balance block and the fan blade in the rotor assembly in structure, increase the contact area with the motor shaft, solve the problem of insufficient holding force between the front balance block and the motor, and improve the production efficiency of the motor, thereby solving the problem of the front balance block of the motor falling off, increasing the product life, and giving consumers a good user experience.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fan blade assembly structure for an inner rotor brushless motor, comprising an engineering plastic fan blade, a metal bushing connected inside the engineering plastic fan blade, the engineering plastic fan blade and the metal bushing constitute a fan blade assembly, the inner wall of the fan blade assembly is connected to the outer wall of the motor shaft, the outer wall of the motor shaft is connected to the inner wall of the first ball bearing, the outer wall of the motor shaft is connected to the inner wall of the rotor core, a magnet is connected in the rotor core slot, the outer wall of the motor shaft is connected to the inner wall of the rear balancing block, the outer wall of the motor shaft is connected to the inner wall of the second ball bearing, the fan blade assembly, the first ball bearing, the motor shaft, the rotor core, the magnet, the rear balancing block, and the second ball bearing constitute a rotor assembly.

[0009] Preferably, a stator assembly is sheathed on the outside of the rotor assembly.

[0010] Preferably, the stator assembly includes a front bobbin, one side of the front bobbin is connected to a stator core, one side of the stator core is connected to a rear bobbin, one side of the rear bobbin is connected to a PCB board, and bolts are connected to the PCB board.

[0011] Preferably, the number of the bolts is three.

[0012] This setting can improve the stability of the device.

[0013] Preferably, the teeth of the front bobbin and the rear bobbin are connected with enameled wires.

[0014] This arrangement can increase the service life of the stator core.

[0015] Preferably, position sensors are connected to the PCB board, and the number of the position sensors is three.

[0016] With this arrangement, after connecting to the external drive circuit and power supply, the position sensor detects the position of the rotor magnetic pole relative to the stator winding according to the change of the rotor position, and generates a position sensor signal at a determined position. The signal conversion circuit controls the switch circuit to make each phase winding conductive in a certain order, and the stator phase current changes phase in a certain order as the rotor position changes, thereby causing the rotor assembly to rotate.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model provides a fan blade assembly structure for an inner rotor brushless motor, which has the following beneficial effects:

[0019] 1. The fan blade assembly structure for the inner rotor brushless motor is composed of a fan blade assembly formed by injection molding a metal bushing and an engineering plastic fan blade. The fan blade assembly structurally replaces the functions of the front balance block and the fan blade in the rotor assembly, increases the contact area with the motor shaft, solves the problem of insufficient holding force between the front balance block and the motor, and improves the production efficiency of the motor.

[0020] 2. The fan blade assembly structure for the inner rotor brushless motor solves the problem of insufficient holding force between the front balance block and the motor by increasing the contact area between the metal bushing and the motor shaft, thereby improving the production efficiency of the motor, thereby solving the problem of the front balance block of the motor falling off, increasing the product life, and giving consumers a good user experience, which is very beneficial for products using motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a front view of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the utility model;

[0024] Figure 3 It is a front view of the metal bushing in the utility model;

[0025] Figure 4 It is a front view of the engineering plastic fan blade in the utility model.

[0026] In the figure: 1. first ball bearing; 13. metal bushing; 2. fan blade assembly; 3. motor shaft; 4. rotor core; 5. magnet; 6. rear balance block; 7. second ball bearing; 8. front wire frame; 9. stator core; 10. rear wire frame; 11. PCB board; 12. bolts. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] like Figure 1-4As shown, the utility model provides a fan blade assembly structure for an inner rotor brushless motor, including an engineering plastic fan blade, a metal bushing 13 is connected inside the engineering plastic fan blade, the engineering plastic fan blade and the metal bushing 13 constitute a fan blade assembly 2, the inner wall of the fan blade assembly 2 is connected to the outer wall of the motor shaft 3, the outer wall of the motor shaft 3 is connected to the inner wall of the first ball bearing 1, the outer wall of the motor shaft 2 is connected to the inner wall of the rotor core 4, a magnet 5 is connected in the groove of the rotor core 4, the outer wall of the motor shaft 3 is connected to the inner wall of the rear balancing block 6, and the outer wall of the motor shaft 3 is connected to the inner wall of the second ball bearing 7. The fan blade assembly 2, the first ball bearing 1, the motor shaft 3, the rotor core 4, the magnet 5, the rear balance block 6, and the second ball bearing 7 constitute a rotor assembly. The outer part of the rotor assembly is sleeved with a stator assembly. The stator assembly includes a front wire frame 8, one side of the front wire frame 8 is connected to a stator core 9, one side of the stator core 9 is connected to a rear wire frame 10, one side of the rear wire frame 10 is connected to a PCB board 11, and the PCB board 11 is connected to a bolt 12.

[0029] In this embodiment, the number of bolts 12 is set to three, which can improve the stability of the device. The teeth of the front wire rack 8 and the rear wire rack 10 are connected with enameled wires, which can improve the service life of the stator core 9. The PCB board 11 is connected with a position sensor, and the number of position sensors is three. After connecting to an external drive circuit and a power supply, the position sensor detects the position of the rotor magnetic pole relative to the stator winding according to the change of the rotor position, and generates a position sensor signal at a determined position. The signal conversion circuit controls the switch circuit, so that each phase winding is turned on in a certain order, and the stator phase current changes phase in a certain order as the rotor position changes, thereby rotating the rotor assembly.

[0030] The working principle of the fan blade assembly structure for the inner rotor brushless motor is described in detail below.

[0031] like Figure 1-4As shown, when in use, the fan blade assembly is formed by injection molding the metal bushing 13 and the engineering plastic fan blade in one piece. On the basis of not increasing the accuracy of the parts, by increasing the contact area between the metal bushing 13 and the motor shaft 3, the problem of insufficient holding force between the front balance block and the motor is solved, and the production efficiency of the motor is improved, thereby solving the problem of the front balance block of the motor falling off, improving the product life, and giving consumers a good use experience, which is very beneficial to the products using the motor. By setting the number of bolts 12 to three, such a setting can improve the stability of the device. By setting the teeth of the stator core 9 to be connected with enameled wire, such a setting can improve the service life of the stator core 9. By setting the PCB board 11 to be connected with a position sensor, the number of position sensors is three. Such a setting can detect the position of the rotor magnetic pole relative to the stator winding according to the change of the rotor position after connecting the external drive circuit and the power supply, and generate a position sensor signal at the determined position, and control the switch circuit through the signal conversion circuit to make each phase winding conductive in a certain order, and the stator phase current changes phase in a certain order with the change of the rotor position, so that the rotor assembly rotates.

Claims

1. A fan blade assembly structure for an inner rotor brushless motor, comprising an engineering plastic fan blade, characterized in that: The engineering plastic fan blade is connected to a metal bushing (13) inside, the engineering plastic fan blade and the metal bushing (13) constitute a fan blade assembly (2), the inner wall of the fan blade assembly (2) is connected to the outer wall of the motor shaft (3), the outer wall of the motor shaft (3) is connected to the inner wall of the first ball bearing (1), the outer wall of the motor shaft (3) is connected to the inner wall of the rotor core (4), a magnet (5) is connected in the slot of the rotor core (4), the outer wall of the motor shaft (3) is connected to the inner wall of the rear balancing block (6), the outer wall of the motor shaft (3) is connected to the inner wall of the second ball bearing (7), and the fan blade assembly (2), the first ball bearing (1), the motor shaft (3), the rotor core (4), the magnet (5), the rear balancing block (6), and the second ball bearing (7) constitute a rotor assembly.

2. The fan blade assembly structure for the inner rotor brushless motor according to claim 1, characterized in that: The stator assembly is sheathed on the outside of the rotor assembly.

3. The fan blade assembly structure for the inner rotor brushless motor according to claim 2, characterized in that: The stator assembly comprises a front bobbin (8), one side of the front bobbin (8) is connected to a stator core (9), one side of the stator core (9) is connected to a rear bobbin (10), one side of the rear bobbin (10) is connected to a PCB board (11), and a bolt (12) is connected to the PCB board (11).

4. The fan blade assembly structure for the inner rotor brushless motor according to claim 3 is characterized in that: The number of the bolts (12) is three.

5. The fan blade assembly structure for the inner rotor brushless motor according to claim 3, characterized in that: The teeth of the front wire rack (8) and the rear wire rack (10) are connected with enameled wires.

6. The fan blade assembly structure for the inner rotor brushless motor according to claim 3, characterized in that: The PCB board (11) is connected to position sensors, and the number of the position sensors is three.

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