Magnet fixing structure of brush motor

Abstract

The magnet fixing structure comprises a stator assembly, a rotor assembly and a rubber cover assembly, the stator assembly comprises a casing, a magnet, a first check ring and a second check ring, the radial lengths of the magnet, the first check ring and the second check ring are equal, the outer side of the magnet is axially provided with a clamping groove, the first check ring is provided with a first clamping part, and the second check ring is provided with a second clamping part. The first check ring is attached to the axial end of the magnet, the first clamping part is clamped in the clamping groove, the second check ring is provided with a second clamping part, the second check ring is attached to the axial end, away from the first check ring, of the magnet, the second clamping part is clamped in the clamping groove, the machine shell is provided with a fixing hole, and the magnet is arranged in the fixing hole; the rotor assembly is arranged in the stator assembly and penetrates through the magnet, the first check ring and the second check ring; and the rubber cover assembly is arranged at the orifice position of the fixing hole. The first clamping part and the second clamping part are matched with the clamping groove, so that axial and radial positioning of the magnet is guaranteed, and slippage or falling in the running process is avoided. The thickness of the first check ring and the thickness of the second check ring are equal to those of the magnets, the assembling problem caused by the thickness problem of a traditional clip is avoided, and compact layout is achieved in a limited space. Unstable operation caused by slippage or falling of the magnets is avoided, and the service life and the stability of the motor are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of brush motor, especially to a magnet fixing structure of brush motor. BACKGROUND

[0002] Brush motor is an important mechanical device widely used in household appliances, industrial equipment and automotive field at present. Its working principle relies on the mechanical contact between carbon brush and commutator to realize the conversion of electric energy and the continuous rotation of rotor. In order to improve the performance of brush motor, high magnetic energy product sintered Nd-Fe-B magnet is gradually introduced in the prior art. This magnet has become one of the core components of modern high-efficiency brush motor due to its small size, high performance and strong magnetic force. However, with the decrease of the thickness of the magnet, higher requirements are put forward for the precise assembly and fixation of the internal structure of the motor.

[0003] The traditional magnet fixing structure of brush motor generally adopts the way of clip or mechanical clamp. However, for the motor using thin-walled sintered Nd-Fe-B magnet, this way has significant limitations. Firstly, the thickness of the clip may exceed the thickness of the magnet, making it difficult to achieve effective fixation. Secondly, the internal space of the motor is limited and cannot accommodate additional mechanical clip structure. This not only leads to the complication of the installation of the magnet, but also may reduce the fixation stability of the magnet, thereby affecting the operation reliability and service life of the motor. In addition, due to the limited fixation area between the magnet and the motor shell, the magnet may slip or fall off when running under high load.

[0004] Therefore, it is necessary to propose a magnet fixing structure of brush motor, aiming to solve the reliable fixation problem of thin-walled sintered Nd-Fe-B magnet in limited space, as well as the assembly complexity and operation stability problems caused thereby, to meet the demand of brush motor for efficient operation and long-term reliability. SUMMARY

[0005] In order to solve the above problems, the utility model provides a magnet fixing structure of brush motor, aiming to solve the reliable fixation problem of thin-walled sintered Nd-Fe-B magnet in limited space, as well as the assembly complexity and operation stability problems caused thereby, to meet the demand of brush motor for efficient operation and long-term reliability.

[0006] The utility model realizes the following technical schemes:

[0007] The utility model provides a magnet fixing structure of brush motor, comprising:

[0008] The stator assembly comprises a housing, a magnet, a first retaining ring and a second retaining ring, the magnet, the first retaining ring and the second retaining ring have equal radial lengths, an outer side of the magnet is axially provided with a clamping groove, the first retaining ring is provided with a first clamping portion, the first retaining ring is attached to an axial end of the magnet, and the first clamping portion is clamped in the clamping groove, the second retaining ring is provided with a second clamping portion, the second retaining ring is attached to an axial end of the magnet away from the first retaining ring, and the second clamping portion is clamped in the clamping groove, the housing is provided with a fixing hole, and the magnet is arranged in the fixing hole.

[0009] The rotor assembly is arranged in the stator assembly and passes through the magnet, the first retaining ring and the second retaining ring.

[0010] The glue cap assembly is arranged at a hole opening position of the fixing hole.

[0011] Further, the first retaining ring is made of plastic material, and the first retaining ring is in interference fit with the housing.

[0012] Further, the inner wall of the fixing hole of the housing is coated with anaerobic glue.

[0013] Further, the second retaining ring is made of aluminum material.

[0014] Further, the rotor assembly comprises:

[0015] The rotor core is attached to the inner wall of the housing.

[0016] The enameled wire is arranged in the rotor core.

[0017] The motor shaft is arranged in the enameled wire.

[0018] The first ball bearing is arranged at an end of the motor shaft towards the first retaining ring.

[0019] The commutator is arranged at an end of the enameled wire away from the first ball bearing.

[0020] The second ball bearing is arranged at an end of the motor shaft away from the first ball bearing.

[0021] Further, the inner bottom surface of the housing is provided with a containing groove, the containing groove is in communication with the fixing hole, and the first ball bearing is arranged in the containing groove.

[0022] Further, the rotor assembly further comprises:

[0023] The first thrust ring is arranged between the first ball bearing and the enameled wire.

[0024] The second thrust ring is arranged between the commutator and the second ball bearing.

[0025] Further, the glue cover assembly comprises:

[0026] The glue cover is arranged at the hole opening position of the fixing hole and is sleeved on the motor shaft.

[0027] The copper terminal is arranged on the glue cover.

[0028] The inductor is electrically connected with the copper terminal.

[0029] Further, the magnet fixing structure of the brush motor further comprises an aluminum rear cover, the aluminum rear cover is connected with the glue cover and is arranged at the hole opening position of the fixing hole.

[0030] Further, the magnet fixing structure of the brush motor further comprises a wave pad, the wave pad is arranged on the aluminum rear cover and is sleeved on the motor shaft.

[0031] The brush motor's magnet fixing structure has the advantages that:

[0032] The brush motor's magnet fixing structure provided by the utility model discloses a stator assembly, a rotor assembly and a glue cover assembly, the stator assembly comprises a shell, a magnet, a first baffle and a second baffle, the magnet, the first baffle and the second baffle have equal radial lengths, a clamping groove is formed in the outer side of the magnet in the axial direction, the first baffle is provided with a first clamping part, the first baffle is attached to one end of the magnet in the axial direction, and the first clamping part is clamped in the clamping groove, the second baffle is provided with a second clamping part, the second baffle is attached to one end of the magnet, which is axially away from the first baffle, and the second clamping part is clamped in the clamping groove, the shell is provided with a fixing hole, and the magnet is arranged in the fixing hole; the rotor assembly is arranged in the stator assembly and passes through the magnet, the first baffle and the second baffle; the glue cover assembly is arranged at the hole opening position of the fixing hole. The first clamping part and the second clamping part are matched with the clamping groove of the magnet, so that the axial and radial positions of the magnet are ensured, and the magnet is prevented from slipping or falling off during operation. The thicknesses of the first baffle and the second baffle are equal to that of the magnet, so that the assembly difficulty caused by the thickness of the traditional clamping piece is avoided, and compact layout is realized in the limited space. The operation instability caused by the slipping or falling off of the magnet is avoided, and the service life and stability of the motor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a whole schematic view of the brush motor's magnet fixing structure of the utility model;

[0034] Figure 2 It is a sectional view schematic view of Figure 1

[0035] Figure 3 It is an exploded schematic view of the stator assembly of the utility model;

[0036] Figure 4 It is a whole sectional view schematic view of Figure 3 ​​

[0037] Figure 5 It is the overall schematic view of the rotor assembly of the utility model.

[0038] Figure 6 It is the overall schematic view of the glue cover assembly of the utility model.

[0039] Reference signs are as follows:

[0040] 10, magnet fixing structure of brush motor;100, stator assembly;110, casing;111, fixing hole;112, accommodating groove;120, magnet;130, first check ring;131, first clamping part;140, second check ring;141, second clamping part;200, rotor assembly;210, rotor core;220, enameled wire;230, motor shaft;240, first ball bearing;250, commutator;260, second ball bearing;270, first thrust collar;280, second thrust collar;300, glue cover assembly;310, glue cover;320, copper terminal;330, inductance;400, aluminum back cover;500, wave pad. DETAILED DESCRIPTION

[0041] In order to more clearly and completely illustrate the technical scheme of the utility model, the utility model is further described below in combination with the drawings.

[0042] Please refer to Figures 1 to 6 The utility model proposes a kind of magnet fixing structure 10 of brush motor, including stator assembly 100, rotor assembly 200 and glue cover assembly 300, stator assembly 100 includes casing 110, magnet 120, first check ring 130 and second check ring 140, magnet 120, first check ring 130 and second check ring 140 radial length is equal, the outside of magnet 120 is axially provided with clamping groove, first check ring 130 is equipped with first clamping part 131, first check ring 130 and magnet 120 axial one end is bonded, and first clamping part 131 is clamped in clamping groove, second check ring 140 is equipped with second clamping part 141, second check ring 140 and magnet 120 axial end away from first check ring 130 are bonded, and second clamping part 141 is clamped in clamping groove, casing 110 is provided with fixing hole 111, and magnet 120 is located in fixing hole 111;Rotor assembly 200 is located in stator assembly 100, and passes through magnet 120, first check ring 130 and second check ring 140;Glue cover assembly 300 is located at the hole mouth position of fixing hole 111.

[0043] Specifically, the stator assembly 100 is composed of a housing 110, a magnet 120, a first retaining ring 130 and a second retaining ring 140, for realizing the fixation and positioning of the magnet 120. The magnet 120 is made of thin-walled sintered Nd-Fe-B. The magnet 120 is provided with a clamping groove in the axial direction, the first retaining ring 130 is located at one end of the magnet 120 in the axial direction, and is attached to the magnet 120 and is clamped with the clamping groove of the magnet 120 through a first clamping portion 131. The first retaining ring 130 is made of plastic material and is in interference fit with the housing 110, so as to ensure the tightness and reliability of the assembly. The second retaining ring 140 is located at the end of the magnet 120 away from the first retaining ring 130, and is clamped in the clamping groove of the magnet 120 through a second clamping portion 141. The second retaining ring 140 is made of aluminum material, which provides additional mechanical strength and enhances the radial and axial stability. The housing 110 is provided with a fixing hole 111 for accommodating the magnet 120 and the retaining ring assembly. The inner wall of the fixing hole 111 is coated with anaerobic adhesive, which effectively improves the fixing force between the magnet 120 and the housing 110.

[0044] In summary, the first clamping portion 131 and the second clamping portion 141 cooperate with the clamping groove of the magnet 120 to ensure the axial and radial positioning of the magnet 120, avoiding slipping or falling off during operation. The thickness of the first retaining ring 130 and the second retaining ring 140 is equal to that of the magnet 120, avoiding the assembly problem caused by the thickness of the traditional clamping piece, and realizing compact layout in limited space. The running instability caused by the slipping or falling off of the magnet 120 is avoided, and the service life and stability of the motor are improved.

[0045] Please refer to Figure 2 and Figure 5 In the present embodiment, the rotor assembly 200 includes a rotor core 210, an enameled wire 220, a motor shaft 230, a first ball bearing 240, a commutator 250 and a second ball bearing 260, the rotor core 210 is attached to the inner wall of the housing 110; the enameled wire 220 is arranged in the rotor core 210; the motor shaft 230 is arranged in the enameled wire 220; the first ball bearing 240 is arranged at the end of the motor shaft 230 towards the first retaining ring 130; the commutator 250 is arranged at one end of the enameled wire 220 away from the first ball bearing 240; and the second ball bearing 260 is arranged at one end of the motor shaft 230 away from the first ball bearing 240.

[0046] Specifically, the rotor assembly 200 passes through the magnet 120, the first retaining ring 130 and the second retaining ring 140, and the motor shaft 230 penetrates through the entire rotor assembly 200. The rotor core 210 is attached to the inner wall of the housing 110 to ensure the integrity of the magnetic circuit, and the enameled wire 220 is wound in the rotor core 210 to form an electromagnetic field to drive the motor to rotate. The motor shaft 230 penetrates through the enameled wire 220 and serves as a core component for power transmission, and is provided with the first ball bearing 240 and the second ball bearing 260 to support the rotation of the motor shaft 230, reduce friction and improve rotation stability. The first ball bearing 240 is arranged at the end of the motor shaft 230 towards the first retaining ring 130 and cooperates with the stator assembly 100; the second ball bearing 260 is arranged at the other end of the motor shaft 230 and is close to the commutator 250, and cooperates with the commutator 250 to realize mechanical conversion of electric energy. Through reasonable structural arrangement, the rotor assembly 200 realizes compact, efficient power transmission and stable mechanical support.

[0047] Please refer to Figure 3 and Figure 4 In the present embodiment, the inner bottom surface of the housing 110 is provided with a containing groove 112, which is in communication with the fixing hole 111, and the first ball bearing 240 is arranged in the containing groove 112. The rotor assembly 200 further comprises a first thrust ring 270 and a second thrust ring 280, the first thrust ring 270 is arranged between the first ball bearing 240 and the enameled wire 220; and the second thrust ring 280 is arranged between the commutator 250 and the second ball bearing 260.

[0048] Specifically, the containing groove 112 is in communication with the fixing hole 111 and is used for containing and fixing the first ball bearing 240. Meanwhile, the first thrust ring 270 is arranged between the first ball bearing 240 and the enameled wire 220 to play a role of axial limiting and supporting; and the second thrust ring 280 is arranged between the commutator 250 and the second ball bearing 260 to further stabilize the axial positioning of the rotor assembly 200. The design of the containing groove 112 enables the ball bearing to be more stably embedded in the inner part of the housing 110, effectively avoiding loosening of the bearing due to vibration or external force; and the first thrust ring 270 and the second thrust ring 280 optimize the stress distribution of the rotor assembly 200, ensuring smooth and firm contact between the bearing and the related components. Through the combined design of the containing groove 112 and the thrust ring, a compact layout and stable operation of the rotor assembly 200 structure are realized.

[0049] Please refer to Figure 1 , Figure 2 and Figure 6In the embodiment, the glue cover assembly 300 comprises a glue cover 310, a copper terminal 320 and an inductor 330, the glue cover 310 is arranged at the hole position of the fixing hole 111 and is sleeved on the motor shaft 230, the copper terminal 320 is arranged on the glue cover 310, and the inductor 330 is electrically connected with the copper terminal 320.

[0050] Specifically, the glue cover 310 is installed at the hole position of the fixing hole 111 and is sleeved on the motor shaft 230, and plays a role of sealing and protecting internal components. The copper terminal 320 is arranged on the glue cover 310, so as to realize reliable connection of the motor and an external circuit and provide a current path. The inductor 330 is electrically connected with the copper terminal 320, so as to optimize electromagnetic compatibility performance of the circuit and reduce electromagnetic interference possibly generated in the operation of the motor. Through reasonable design of the glue cover 310, not only the internal components are protected from dust, sundries and moisture, but also the electrical connection part is integrated in the glue cover assembly 300, so that the structural layout of the overall motor is simplified, and the stability and use convenience of the motor are enhanced.

[0051] Please refer to Figure 6 In the embodiment, the magnet fixing structure 10 of the brush motor further comprises an aluminum rear cover 400, the aluminum rear cover 400 is connected with the glue cover 310 and is arranged at the hole position of the fixing hole 111.

[0052] Specifically, the aluminum rear cover 400 is connected with the glue cover 310 and is installed at the hole position of the fixing hole 111. The aluminum rear cover 400 is closely combined with the glue cover 310, so as to not only provide additional mechanical protection for the motor hole, but also effectively enhance the sealing performance and strength of the hole. The aluminum rear cover 400 can also provide additional support for the glue cover assembly 300, so as to ensure the structural stability of the assembly in long-term operation and further improve the overall heat dissipation capacity of the motor.

[0053] Please refer to Figure 6 In the embodiment, the magnet fixing structure 10 of the brush motor further comprises a wave pad 500, the wave pad 500 is arranged on the aluminum rear cover 400 and is sleeved on the motor shaft 230.

[0054] Specifically, the wave pad 500 is arranged on the aluminum rear cover 400 and is sleeved on the motor shaft 230. The wave pad 500 is an elastic element, and provides buffering and damping functions for the motor shaft 230 through the special wave structure. In the operation process of the motor, the wave pad 500 can absorb vibration and axial impact, so as to reduce the influence of these factors on the motor shaft 230, the aluminum rear cover 400 and other components.

[0055] Of course, the utility model also can have other various implementation manners, based on the embodiment, other implementation manners obtained by the ordinary skilled in the art without any creative labor all belong to the range protected by the utility model.

Claims

1. A magnet fixing structure of a brush motor, characterized by comprising: The application relates to a brush motor magnet fixing structure. The stator assembly comprises a shell, magnets, a first retaining ring and a second retaining ring, the radial lengths of the magnets, the first retaining ring and the second retaining ring are equal, the outer side of the magnet is axially provided with a clamping groove, the first retaining ring is provided with a first clamping part, the first retaining ring is attached to one end of the magnet in the axial direction, and the first clamping part is clamped in the clamping groove, the second retaining ring is provided with a second clamping part, the second retaining ring is attached to one end of the magnet axially away from the first retaining ring, and the second clamping part is clamped in the clamping groove, and the shell is provided with a fixing hole, and the magnet is arranged in the fixing hole. The rotor assembly is arranged in the stator assembly and passes through the magnets, the first retaining ring and the second retaining ring. The glue cover assembly is arranged at the hole opening position of the fixing hole.

2. The magnet fixing structure of a brush motor according to claim 1, characterized by The first retaining ring is made of plastic material, and the first retaining ring is in interference fit with the shell.

3. The magnet fixing structure of a brush motor according to claim 1 or 2, characterized in that, The inner wall of the fixing hole of the shell is coated with anaerobic glue.

4. The magnet fixing structure of a brush motor according to claim 1, characterized in that, The second retaining ring is made of aluminum material.

5. The magnet fixing structure of a brush motor according to claim 1, wherein The rotor assembly comprises a rotor core attached to the inner wall of the shell, a lacquered wire arranged in the rotor core, a motor shaft arranged in the lacquered wire, a first ball bearing arranged at the end of the motor shaft towards the first retaining ring, a commutator arranged at one end of the lacquered wire away from the first ball bearing, and a second ball bearing arranged at one end of the motor shaft away from the first ball bearing. The inner bottom surface of the shell is provided with a containing groove in communication with the fixing hole, and the first ball bearing is arranged in the containing groove. The rotor assembly further comprises a first thrust ring arranged between the first ball bearing and the lacquered wire and a second thrust ring arranged between the commutator and the second ball bearing. The glue cover assembly comprises a glue cover arranged at the hole opening position of the fixing hole and sleeved on the motor shaft, a copper terminal arranged on the glue cover and an inductor electrically connected with the copper terminal. The brush motor magnet fixing structure further comprises an aluminum back cover connected with the glue cover and arranged at the hole opening position of the fixing hole. The brush motor magnet fixing structure further comprises a wave pad arranged on the aluminum back cover and sleeved on the motor shaft. ​ 6. The magnet fixing structure of a brush motor according to claim 5, wherein ​ 7. The magnet fixing structure of a brush motor according to claim 5, wherein ​ ​ ​ 8. The magnet fixing structure of a brush motor according to claim 5, wherein ​ ​ ​ ​ 9. The magnet fixing structure of a brush motor according to claim 8, wherein ​ 10. The magnet fixing structure of a brush motor according to claim 9, wherein ​

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