Shaft end structure capable of preventing bearing electrocorrosion and motor

Abstract

The utility model belongs to the technical field of driving motors, and particularly relates to a shaft end structure for preventing electric corrosion of a bearing and a motor. A shaft end structure capable of preventing electric corrosion of a bearing comprises a shaft end shell installed on an external work piece and a PCB installed in the shaft end shell, a contact seat is arranged on the PCB, a shaft end driving assembly is installed on the contact seat, the shaft end driving assembly comprises an output shaft and a connecting bearing, and the shaft end structure further comprises a wiring end set. The wiring terminal group comprises an external wiring terminal and a grounding wiring terminal; the motor comprises the shaft end structure and further comprises a motor support and an external work piece, the shaft end shell is installed on the motor support, and the external work piece is installed on the output shaft. The utility model provides a shaft end structure for preventing electric corrosion of a bearing and a motor, so as to solve the problems of difficult operation, high cost and high potential risk existing in a bearing electric corrosion protection scheme in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model belongs to drive motor technical field, concretely relates to a kind of shaft end structure and motor of bearing electric corrosion prevention. BACKGROUND

[0002] When PWM inverter drives motor, the high-frequency switching of power element can generate high-frequency common-mode voltage, and then form common-mode current path through coupling capacitor in motor, and shaft current is part of common-mode current.When the bearing voltage between inner and outer raceways of bearing exceeds oil film threshold voltage, it can break through bearing oil film, and then generate electric corrosion, cause bearing to be damaged, affect bearing life, thereby affect the service life of fan.In order to prevent bearing electric corrosion, it is particularly important to prevent shaft current from forming loop connection in the design of shaft end connection structure.

[0003] The current common solution to solve this problem is to use brush, so that shaft current passes through brush without passing through bearing, but in this scheme, brush is easy to wear, and needs to be replaced regularly, and it is difficult to replace.In addition, insulation bearing is used to prevent discharge between inner and outer rings of bearing to generate shaft current, but insulation bearing is high in cost and not suitable for promotion;There is also a method of installing components in motor to guide shaft current on rotor to ground, to protect bearing when PWM inverter (or same type of energy supply device) drives motor to work normally, but this scheme may cause common-mode voltage to be too large when PWM inverter (or same type of energy supply device) itself fails, and then cause electric corrosion to occur, and in this case, shaft current generated by high-frequency common-mode voltage is very large, which can damage bearing instantly, and even directly damage motor, with high potential risk. UTILITY MODEL CONTENTS

[0004] In order to overcome the shortcomings of prior art, the utility model provides a kind of shaft end structure and motor of bearing electric corrosion prevention, to solve the problems of operation difficulty, high cost and high potential risk existing in bearing electric corrosion protection scheme in prior art.

[0005] One scheme of the utility model provides a kind of shaft end structure of bearing electric corrosion prevention, including shaft end shell installed on external work piece and PCB board installed in shaft end shell interior, contact seat is equipped on the PCB board, shaft end drive assembly is installed on the contact seat, the shaft end drive assembly includes output shaft and connecting bearing;

[0006] It further includes wiring terminal group, and the wiring terminal group includes external wiring terminal and grounding wiring terminal, the external wiring terminal is used to connect external energy supply device, and the grounding wiring terminal is used for grounding;

[0007] The contact seat is used for matching the external wiring terminal to connect the negative pole of the external power supply device, thereby forming a loop and releasing the loop voltage and current.

[0008] The shaft end driving assembly is used for matching the external wiring terminal through the PCB to connect the positive pole of the external power supply device and form a loop in the shaft end shell, thereby driving the output shaft to rotate.

[0009] It should be noted that when the PWM inverter drives the motor, the high-frequency common-mode voltage generated by the high-frequency switching of the power element will generate a parasitic capacitor. In the utility model, the parasitic capacitor is generated in the shaft end driving assembly when the high-frequency common-mode voltage is generated. However, the core idea of the utility model is to isolate the parasitic capacitor from the connecting bearing in the shaft end driving assembly to protect the connecting bearing from the influence of electrical corrosion. The specific structure of the shaft end driving assembly is fully described below and will not be repeated here. In the present scheme, the contact seat is matched with the external wiring terminal. Specifically, the wiring terminal connected to the negative pole of the external power supply device in the external wiring terminal is arranged on the contact seat to achieve the effect of forming a new loop and releasing voltage and current.

[0010] Specifically, the specific design idea of the utility model is that, through the shaft end driving assembly and the PCB, the external wiring terminal is matched to change the original series circuit with the current direction being the positive pole of the external power supply device, the shaft end driving assembly, the grounding wiring terminal and the ground in sequence into a new circuit with the current direction being the positive pole of the external power supply device, the positive pole of the PCB, the shaft end driving assembly, the negative pole of the PCB, the contact seat and the negative pole of the external power supply device in sequence, and the current direction being the positive pole of the external power supply device, the positive pole of the PCB, the shaft end driving assembly, the negative pole of the PCB, the grounding wiring terminal and the ground in sequence. The new circuit of the circuit one and the circuit two is in parallel connection. The new circuit can isolate the parasitic capacitor generated by the high-frequency common-mode voltage from the shaft end driving assembly through the circuit one and release the voltage and current to the negative pole of the external power supply device, thereby reducing the current in the circuit two where the connecting bearing is located, and achieving the effect of protecting the connecting bearing from the influence of electrical corrosion.

[0011] It should be additionally noted that the external workpiece can be the same type of workpiece that can be used with the output shaft, such as a fan blade. The mounting hole or mounting slot for mounting the output shaft on the external workpiece is used to complete the installation of the external workpiece and the output shaft.

[0012] It should be additionally noted that the external power supply device can be the same type of power supply device with alternating voltage, such as a power grid, a frequency converter, an inverter, etc. The utility model can be applied to any power supply device with alternating voltage to prevent the connecting bearing or the specific component in the work equipment connected thereto from being electrically corroded, thereby affecting the normal work and service life of the work equipment.

[0013] In the scheme, by setting the PCB board inside the shaft end shell, and additionally setting the contact seat for connecting the shaft end driving assembly on the PCB board, the wiring terminal group and the external power supply device can be matched to form a new parallel circuit in the shaft end driving assembly, and then through the parallel circuit, the connection circuit of the output shaft and the connecting bearing in the shaft end driving assembly with the external power supply device is changed, so that the connecting bearing and the output shaft in the shaft end driving assembly are not directly connected in series with the external power supply device to release the voltage back to the negative electrode, and the shaft current of the connecting bearing and the output shaft is greatly reduced, thereby realizing the protection effect on the loop where the output shaft and the connecting bearing are located.

[0014] Compared with the existing bearing electric corrosion protection scheme, the main advantages of the utility model are:

[0015] 1, the utility model for using only needs to install in the corresponding position, and after putting into use, it does not need to carry out additional operation such as replacing parts, also does not need to replace the parts of internal wear and tear regularly, and will not additionally wear parts in the process of using, resulting in the cost of additional wear parts, the utility model has the advantages of simple operation, no additional part cost in the process of using;

[0016] 2, the utility model structure is simple, by additionally setting the PCB board on the shaft end shell, additionally setting the contact seat on the PCB board, and additionally setting the external wiring terminal on the PCB board and the contact seat, the connecting mode of the output shaft and the bearing in the shaft end structure with the external power supply device in series is avoided, and the voltage and the current are released through the external wiring terminal to greatly reduce the shaft current of the loop where the output shaft and the connecting bearing are located, and the protection of the connecting bearing is realized, the utility model is based on simple structure and low cost, on the one hand, the high cost of using insulating bearings is avoided, and on the other hand, the higher potential risk that the bearing and even the motor are damaged due to the failure of the external power supply device is solved.

[0017] In one of the schemes, the external wiring terminal is arranged on the PCB board, and the grounding wiring terminal is arranged on the shaft end shell.

[0018] In one of the schemes, the external wiring terminal includes a positive terminal and a negative terminal, the positive terminal is arranged on the PCB board, the negative terminal is arranged on the contact seat, the positive terminal is used for connecting the positive pole of the external power supply, and the negative terminal is used for connecting the negative pole of the external power supply and the grounding wiring terminal.

[0019] It should be noted that the positive terminal and the negative terminal are respectively connected with the positive pole and the negative pole of the external power supply device through wires, and the negative terminal is also connected with the grounding wiring terminal.

[0020] Specifically, in the actual working process of the utility model, including two circuits, the first is the circuit one of which the current direction is external power supply equipment anode, positive terminal on the PCB board, shaft end drive assembly, negative terminal on the contact seat, external power supply equipment cathode, the second is the circuit two of which the current direction is external power supply equipment anode, positive terminal on the PCB board, shaft end drive assembly, negative terminal on the contact seat, grounding terminal, ground, wherein, the negative terminal is connected to the negative pole of the external power supply equipment through the wire from the contact seat, and the positive terminal is connected to the positive pole of the external power supply equipment through the wire from the PCB board.

[0021] In the scheme, by setting the positive terminal on the PCB board and the negative terminal on the contact seat on the PCB board, a circuit connected to the negative pole of the external power supply equipment is parallelly connected in the circuit formed by the PCB board, the contact seat and the shaft end drive assembly, so as to release part of the high-frequency common-mode voltage caused by the external power supply equipment and share the shaft current in the circuit formed by the PCB board, the contact seat and the shaft end drive assembly, thereby achieving the effect of protecting the connecting bearing from the electric corrosion.

[0022] In one of the schemes, the shaft end drive assembly further comprises a copper pipe, an inner wall of the copper pipe is provided with a groove for mounting the connecting bearing, the connecting bearing is mounted in the copper pipe, and the output shaft is mounted in the connecting bearing.

[0023] In one of the schemes, the connecting bearing is provided with at least two.

[0024] It should be noted that the groove in the inner wall of the copper pipe is matched with the connecting bearing, the connecting bearing can be a ball bearing, and the connecting bearing is provided with at least two and located at two ends of the copper pipe, and the connection between the output shaft and the ball bearing can be realized through a gap fit.

[0025] In the scheme, the provision of at least two connecting bearings can enhance the stability of the rotation of the output shaft in the copper pipe.

[0026] In one of the schemes, an iron core is mounted outside the copper pipe, an insulating stack is mounted on the iron core, a coil is arranged on the insulating stack, and the coil is tightly wound on the iron core through the insulating stack.

[0027] In one of the schemes, a magnetic sleeve is mounted outside the iron core, and the magnetic sleeve is attached to the inner wall of the shaft end shell.

[0028] It should be noted that the magnetic sleeve itself continuously generates a permanent magnetic field, when the external power supply equipment works, the coil has current passing through, and a magnetic field is generated around the coil, the magnetic field of the magnetic sleeve interacts with the magnetic field of the coil, the external power supply equipment continuously provides direct current to the coil, and then generates a coil magnetic field to drive the fan blades to rotate continuously.

[0029] In the scheme, by setting the cooperation between the core, the coil and the magnetic sleeve, the external power supply device can be matched, and the output shaft is driven to rotate at high speed by the direct current provided by the external power supply device.

[0030] The motor provided in one of the schemes of the utility model comprises the shaft end structure for preventing bearing electric corrosion, and further comprises a motor support and an external working part, the shaft end shell is installed on the motor support, and the external working part is installed on the output shaft.

[0031] In one of the schemes, the external working part is provided with a connecting groove for connecting the output shaft.

[0032] In one of the schemes, a fastener is arranged in the connecting groove, and the fastener is in interference connection with the output shaft.

[0033] It should be noted that the external working part can be a same type working part, such as a fan blade, which can be used with the output shaft, and the installation of the external working part and the output shaft is completed through the mounting hole or the mounting groove provided on the external working part for mounting the output shaft.

[0034] In the scheme, the motor provided by the utility model has the advantages of the shaft end structure for preventing bearing electric corrosion, and further, the motor provided by the utility model can be connected with various external working parts, and the interference connection between the fastener arranged in the connecting groove and the output shaft enables the output shaft and the external working part to be tightly connected, thereby enhancing the connection strength of the external working part. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0036] Figure 1 It is a whole structure schematic view of one of the embodiments of the utility model shaft end structure for preventing bearing electric corrosion and motor.

[0037] Figure 2 It is a whole structure schematic view of another view of the utility model. Figure 1

[0038] Figure 3 It is one of the vertical sectional views of the utility model. Figure 1

[0039] Figure 4 It is​​Figure 1 One of the horizontal cross-sectional views;

[0040] Figure 5 This is a schematic diagram of the circuit principle of Example 1.

[0041] Among them, 1. Shaft end housing; 2. Shaft end drive assembly; 21. Output shaft; 22. Connecting bearing; 23. Copper tube; 231. Groove; 24. Iron core; 25. Magnetic sleeve; 3. Motor bracket; 4. External working part; 41. Connecting groove; 42. Fastener. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] It needs to be noted that the specific structure of the PCB board, the contact seat and the wiring terminal group used in the utility model is not specifically limited, wherein, the limitation of the contact seat is only to have a structure capable of mounting the shaft end driving assembly 2 and to have an external wiring terminal as a standard, the limitation of the PCB board is only to have an external wiring terminal as a standard, and the limitation of the wiring terminal group is only to be respectively arranged on the contact seat, the PCB board and the shaft end shell 1 as a standard, so the above specific structure is not embodied in the drawings.

[0046] Please refer to Figures 1-5 The utility model discloses a kind of shaft end structures of preventing bearing electric corrosion, including the shaft end shell installed on external workpiece 4 and the PCB board installed in shaft end shell interior, contact seat is equipped on the PCB board, shaft end driving assembly 2 is installed on the contact seat, the shaft end driving assembly 2 includes output shaft 21 and connecting bearing 22;

[0047] It further includes wiring terminal group, and the wiring terminal group includes external wiring terminal and grounding wiring terminal, the external wiring terminal is used to connect external energy supply equipment, and the grounding wiring terminal is used to ground;

[0048] The contact seat is used to cooperate with the external wiring terminal to connect the negative pole of external energy supply equipment, to form a loop and release loop voltage and current in turn;

[0049] The shaft end driving assembly 2 is used to connect the positive pole of external energy supply equipment by cooperating with the external wiring terminal through the PCB board, and form a loop in shaft end shell 1, to drive output shaft 21 to rotate in turn.

[0050] It needs to be noted that when PWM inverter drives motor, high-frequency common-mode voltage is generated by high-frequency switch of power element, to generate parasitic capacitance in turn, in the utility model, when high-frequency common-mode voltage is generated, parasitic capacitance is specifically generated in shaft end driving assembly 2, but the core idea of the utility model is that, by isolating parasitic capacitance from connecting bearing 22 in shaft end driving assembly 2, connecting bearing 22 is protected from the influence of electric corrosion, the specific structure of shaft end driving assembly 2 is fully described below, and here is not repeated;The cooperation of contact seat and external wiring terminal in the scheme can be realized by arranging the wiring terminal connected with the negative pole of external energy supply equipment in external wiring terminal on the contact seat, to form new loop and release voltage and current effect in turn;

[0051] Specifically, the specific design idea of the utility model is that through the shaft end driving assembly 2 and the PCB board, cooperating with the external wiring terminal, the series circuit of the current direction in turn is the positive electrode of the external power supply equipment, the shaft end driving assembly 2, the grounding wiring terminal to the ground, is changed into the circuit one of the current direction in turn being the positive electrode of the external power supply equipment, the positive electrode of the PCB board, the shaft end driving assembly 2, the contact seat, the negative electrode of the PCB board, the negative electrode of the external power supply equipment, the circuit two of the current direction in turn being the positive electrode of the external power supply equipment, the positive electrode of the PCB board, the shaft end driving assembly 2, the negative electrode of the PCB board, the grounding wiring terminal to the ground, the new circuit of the circuit one and the circuit two in parallel, the new circuit can isolate the parasitic capacitance generated by the high-frequency common-mode voltage from the shaft end driving assembly 2 through the circuit one and release voltage and current to the negative electrode of the external power supply equipment, and then greatly reduce the current in the circuit two where the connecting bearing 22 is located, so as to protect the connecting bearing 22 from the effect of electric corrosion.

[0052] It should be additionally explained that the external working part 4 can be the same type of working part available for the output shaft 21, such as a fan blade, and the mounting of the external working part 4 and the output shaft 21 is completed through the mounting hole or mounting slot for mounting the output shaft 21 provided on the external working part 4.

[0053] It should be additionally explained that the external power supply equipment can be the same type of power supply equipment with alternating voltage, such as a power grid, a frequency converter, an inverter, etc., and the utility model can be applied to any power supply equipment with alternating voltage to prevent the connecting bearing 22 or the specific components in the working equipment connected thereto from electric corrosion, thereby affecting the normal work and service life of the working equipment.

[0054] In this embodiment, by arranging the PCB board inside the shaft end housing 1 and additionally arranging the contact seat for connecting the shaft end driving assembly 2 on the PCB board, a new parallel circuit can be formed in the shaft end driving assembly 2 by cooperating with the wiring terminal group and the external power supply equipment, and the connection circuit of the output shaft 21 and the connecting bearing 22 in the shaft end driving assembly 2 with the external power supply equipment is changed through the parallel circuit, so that the connecting bearing 22 in the shaft end driving assembly 2 is not directly connected with the external power supply equipment in series with the output shaft 21, the voltage is released back to the negative electrode, and the shaft current of the connecting bearing 22 and the output shaft 21 is greatly reduced, thereby realizing the protection effect on the circuit where the output shaft 21 and the connecting bearing 22 are located.

[0055] Compared with the existing bearing electric corrosion protection scheme, the main advantage of the utility model is that:

[0056] 1. The utility model discloses a simple operation, and the inside component of not needing to be replaced regularly is not needed in the process of using, and the cost of the additional component of needing to pay is not needed, and the utility model has the advantages of simple operation and no additional component cost in the process of using;

[0057] 2. The utility model discloses simple structure, through the mode that the PCB board is additionally arranged on the axle end shell 1, and the contact seat is additionally arranged on the PCB board, and the external wiring terminal is additionally arranged on the PCB board and the contact seat, avoid the connection mode that the output shaft 21 and bearing in the axle end structure are connected in series with the external energy supply equipment, and release voltage and current through the external wiring terminal, to reduce the shaft current of the loop where the output shaft 21 and connecting bearing 22 are at greatly, realize the protection of connecting bearing 22, the utility model discloses on the basis of simple structure and lower cost, on one hand, avoid the high cost that needs to bear of using insulation bearing, on the other hand, solve the higher potential risk that bearing and even motor damage possibly caused by the external energy supply equipment failure.

[0058] In one embodiment, the external wiring terminal is provided on the PCB board, and the grounding wiring terminal is provided on the axle end shell 1.

[0059] In one embodiment, the external wiring terminal includes a positive terminal and a negative terminal, the positive terminal is provided on the PCB board, the negative terminal is provided on the contact seat, the positive terminal is used for connecting the positive pole of the external power supply, and the negative terminal is used for connecting the negative pole of the external power supply and the grounding wiring terminal.

[0060] It should be noted that the positive terminal and the negative terminal are respectively connected with the positive pole and the negative pole of the external energy supply equipment through wires, and the negative terminal is also connected with the grounding wiring terminal.

[0061] Specifically, in the actual working process of the utility model, there are two loops, the first one is circuit one with the current direction being the external energy supply equipment positive pole, the axle end driving assembly 2, the PCB board, the contact seat, the external energy supply equipment negative pole in turn, and the second one is circuit two with the current direction being the external energy supply equipment positive pole, the axle end driving assembly 2, the grounding wiring terminal to the ground in turn, wherein the negative terminal is connected to the negative pole of the external energy supply equipment through wires from the contact seat, and the positive terminal is connected to the positive pole of the external energy supply equipment through wires from the PCB board.

[0062] In this embodiment, by setting the positive terminal on the PCB board and the negative terminal on the contact seat on the PCB board, a loop connecting the negative terminal of the external power supply device is parallelly connected in the loop formed by the PCB board, the contact seat and the shaft end driving assembly 2, so as to release part of the high-frequency common-mode voltage caused by the external power supply device and share the shaft current in the loop formed by the PCB board, the contact seat and the shaft end driving assembly 2, thereby achieving the effect of protecting the connecting bearing 22 from electric corrosion.

[0063] In one of the schemes, the shaft end driving assembly 2 further comprises a copper pipe 23, the inner wall of the copper pipe 23 is provided with a groove 231 for mounting the connecting bearing 22, the connecting bearing 22 is mounted in the copper pipe 23, and the output shaft 21 is mounted in the connecting bearing 22.

[0064] In one of the embodiments, the connecting bearing 22 is provided with at least two.

[0065] It should be noted that the groove 231 in the inner wall of the copper pipe 23 is adapted to the connecting bearing 22, the connecting bearing 22 can be a ball bearing, and the connecting bearing 22 is provided with at least two and is located at the two ends of the copper pipe 23, and the connection between the output shaft 21 and the ball bearing can be achieved by gap fitting.

[0066] In this embodiment, the provision of at least two connecting bearings 22 can enhance the stability of the rotation of the output shaft 21 in the copper pipe 23.

[0067] In one of the embodiments, the copper pipe 23 is externally mounted with an iron core 24, the iron core 24 is mounted with an insulating stack (not shown), the insulating stack (not shown) is provided with a coil (not shown), and the coil (not shown) is tightly wound on the iron core 24 through the insulating stack (not shown).

[0068] In one of the embodiments, the iron core 24 is externally mounted with a magnetic sleeve 25, and the magnetic sleeve 25 is attached to the inner wall of the shaft end shell 1.

[0069] It should be noted that the magnetic sleeve 25 itself continuously generates a permanent magnetic field, when the external power supply device is working, the coil (not shown) has current passing through and generates a coil magnetic field around the coil (not shown), the magnetic field of the magnetic sleeve 25 interacts with the coil magnetic field, the external power supply device continuously provides direct current to drive the fan blades to continuously rotate; in this process, the copper pipe 23 and the negative terminal of the PCB board form a loop, which can isolate the voltage from flowing through the connecting bearing 22.

[0070] In this embodiment, by setting the cooperation among the iron core 24, the coil (not shown) and the magnetic sleeve 25, the external power supply device can be matched, and the direct current provided by the external power supply device can be used to drive the output shaft 21 to rotate at high speed.

[0071] The utility model discloses one scheme provides a kind of motor, including the shaft end structure of preceding bearing electric corrosion prevention, still include motor support 3 and external workpiece 4, the shaft end shell 1 is installed on the motor support 3, the external workpiece 4 installs the output shaft 21.

[0072] In one embodiment, the external workpiece 4 has a connecting groove 41 for connecting the output shaft 21.

[0073] In one embodiment, the connecting groove 41 is provided with a fastener 42, and the fastener 42 is interference connected with the output shaft 21.

[0074] It should be noted that the external workpiece 4 can be a fan blade or other output shaft 21 usable workpiece, and the installation of the external workpiece 4 and the output shaft 21 is completed by the mounting hole or mounting groove on the external workpiece 4 for mounting the output shaft 21.

[0075] In this embodiment, the motor provided by the utility model has the advantages of the shaft end structure for preventing bearing electric corrosion, and the motor can be connected to various external workpieces 4. The interference connection between the fastener 42 in the connecting groove 41 and the output shaft 21 tightly connects the output shaft 21 and the external workpiece 4, and enhances the connection strength of the external workpiece 4.

[0076] The specific structure and working principle of one preferred embodiment of the utility model are described below:

[0077] Embodiment 1

[0078] The motor includes a shaft end shell 1 and a motor support 3. The shaft end shell 1 is installed on the motor support 3. A PCB board is installed inside the shaft end shell 1. A contact seat is provided on the PCB board. A grounding terminal is provided on the shaft end shell 1. A positive terminal is provided on the PCB board. A negative terminal is provided on the contact seat. A shaft end driving assembly 2 is also installed on the contact seat.

[0079] The PCB board and the contact seat in the shaft end shell 1 are connected to the positive and negative terminals of an external power supply device through the positive and negative terminals, respectively.

[0080] The shaft end driving assembly 2 includes a magnetic sleeve 25, an iron core 24, a coil (not shown), and a copper pipe 23. The iron core 24 is installed around the outside of the copper pipe 23. An insulating bracket (not shown) is provided on the iron core 24. The coil (not shown) is tightly wound on the iron core 24 through the insulating bracket (not shown). The magnetic sleeve 25 is provided on the outer ring of the iron core 24.

[0081] The copper pipe 23 is internally provided with a groove 231 for mounting the connecting bearing 22, the connecting bearing 22 is mounted in the groove 231, the output shaft 21 is mounted in the connecting bearing 22, the output end of the output shaft 21 is connected with the external working piece 4 through the connecting groove 41 and the fastener 42 on the external working piece 4, the connecting bearing 22 is a ball bearing, and the external working piece 4 is a fan blade;

[0082] Please refer to Figure 5 It should be noted that the equivalent resistance of the middle pipe is the resistance of the equivalent copper pipe 23, and the variable equivalent resistance of the oil film is the resistance of the grease in the connecting bearing; in actual use, the external power supply device supplies power to the motor, and when the motor works, two loops are formed in the motor, the current direction of the first loop is: the positive electrode of the external power supply device, the positive electrode terminal on the PCB, the coil (not shown), the iron core 24, the copper pipe 23, the negative electrode terminal on the contact seat, the negative electrode of the external power supply device, and the current direction of the second loop is: the positive electrode of the external power supply device, the positive electrode terminal on the PCB, the coil (not shown), the iron core 24, the copper pipe 23, the negative electrode terminal on the contact seat, the grounding terminal on the shaft end shell 1 and the ground.

[0083] When the current in the foregoing loop passes through the coil (not shown), a magnetic field is generated around the coil (not shown); since the magnetic sleeve 25 continuously generates a magnetic sleeve 25 magnetic field, the magnetic sleeve 25 magnetic field interacts with the coil magnetic field, the external power supply device continuously provides direct current to drive the fan blade to rotate continuously; in this process, the copper pipe 23 and the negative electrode of the PCB form a loop, which can isolate the current from flowing through the connecting bearing 22.

[0084] The above only describes preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made according to the utility model specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A shaft end structure for preventing bearing electro-corrosion, characterized in that, The shaft end shell is installed on the external working member, and the PCB board is installed inside the shaft end shell, the PCB board is provided with a contact seat, the shaft end driving assembly is installed on the contact seat, and the shaft end driving assembly comprises an output shaft and a connecting bearing; The terminal group comprises an external terminal and a grounding terminal, the external terminal is used for connecting an external power supply device, and the grounding terminal is used for grounding; The contact seat is used for matching the external terminal to connect a negative electrode of the external power supply device, so as to form a loop and release loop voltage and current; The shaft end driving assembly is used for matching the external terminal through the PCB board to connect a positive electrode of the external power supply device, and forms a loop in the shaft end shell, so as to drive the output shaft to rotate; The shaft end driving assembly further comprises a copper pipe, the inner wall of the copper pipe is provided with a groove for installing the connecting bearing, the connecting bearing is installed inside the copper pipe, and the output shaft is installed in the connecting bearing; The outer part of the copper pipe is provided with an iron core, the iron core is provided with an insulating stack, and the insulating stack is provided with a coil, the coil is tightly wound on the iron core through the insulating stack.

2. A shaft end construction for protection against electric bearing corrosion as claimed in claim 1, characterized in that The external terminal is arranged on the PCB board, and the grounding terminal is arranged on the shaft end shell.

3. A shaft end construction for protection against electric corrosion of a bearing as claimed in claim 2, characterized in that The external terminal comprises a positive terminal and a negative terminal, the positive terminal is arranged on the PCB board, the negative terminal is arranged on the contact seat, the positive terminal is used for connecting a positive electrode of an external power supply, and the negative terminal is used for connecting a negative electrode of the external power supply and a grounding terminal.

4. A shaft end construction for preventing electric corrosion of a bearing as defined in claim 1, characterized in that The connecting bearing is provided with at least two.

5. A shaft end construction for preventing electric corrosion of a bearing as defined in claim 1, wherein The outer part of the iron core is provided with a magnetic sleeve, and the magnetic sleeve is attached to the inner wall of the shaft end shell.

6. An electric machine characterized by The shaft end structure for preventing bearing electric corrosion comprises the shaft end structure as claimed in any one of claims 1-5, a motor support and an external working member, the shaft end shell is installed on the motor support, and the external working member is installed on the output shaft.

7. An electric machine as claimed in claim 6, characterised in that The external working member is provided with a connecting groove for connecting the output shaft.

8. An electric machine as claimed in claim 7, characterised in that The connecting groove is provided with a fastener, and the fastener is in interference connection with the output shaft.

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