CN219372203U - Static motor for shaft current detection - Google Patents

Abstract

The utility model discloses an electrostatic motor for detecting shaft current, which relates to the technical field of shaft current detection and comprises the following components: the stator assembly comprises end plates, support columns and first conductive sheets, wherein the support columns are in an even number, are distributed between the two end plates in an annular array, and are sleeved with the first conductive sheets; the rotor assembly comprises a rotating shaft, a cylinder body and second conductive sheets, wherein two ends of the rotating shaft are respectively connected with the two end plates in a rotating way, the cylinder body is sleeved on the rotating shaft, the second conductive sheets are equal to the first conductive sheets in number, and all the second conductive sheets are distributed on the cylinder body in an annular array; one end of the positive electrode conducting wire is connected with the first conducting plates on the odd support columns in the positive even number, and the other end of the positive electrode conducting wire is connected with the tip sensing plate; and one end of the negative electrode conducting wire is connected with the first conducting plates on the even support columns in the positive even number. The utility model can rapidly detect whether the shaft current is generated when the motor rotor runs, and timely eliminate the shaft current.

Description

Static motor for shaft current detection

Technical Field

The utility model relates to the technical field of shaft current detection, in particular to an electrostatic motor for shaft current detection.

Background

The motor is widely used in various industries, is heart equipment for providing power for various equipment, and with the progress of the industry and the development of the equipment, the single power of the industrial equipment is increased, meanwhile, the power increase of the power equipment is brought, and the current increase on a line is necessarily brought by the power increase of the motor. When the motor operates, a stator magnetic field is generated by high current through the stator coil, and the high current is coupled with a rotor magnetic field to enable the motor to continuously operate, but because the concentricity precision of the rotor which is machined is not high enough, or the stator magnetic field is unbalanced, when alternating magnetic flux occurs, shaft voltage is induced on a motor shaft, so that shaft current is generated on the motor shaft, the bearing inner ring and the bearing outer ring. Because the shaft voltage is very low, but the loop resistance is very low, the shaft current is very high, and the shaft current breaks through a bearing oil film, so that the bearing balls are electrically corroded, the bearing is burnt out, and the conditions of forced shutdown, accidents and the like are caused. There are generally no methods and apparatus for efficiently detecting shaft current in the industry, and in general, there are some redundancy measures that are adopted when comprehensively analyzing the shaft current that may be generated by a motor, for example: 1. one side of the carbon brush is contacted with the shaft, and the other side of the carbon brush is grounded for discharging, but the carbon brush has the defect that abrasion occurs when the carbon brush is accumulated along with the time, and the carbon powder can also fall into the motor to cause short circuit of electronic components. 2. The conductive ring is used for contacting the shaft, so that the conductive ring has the defects of high cost, needs to be matched with the shell and the shaft for adjustment, and cannot be used in a high-speed running motor. 3. The insulated bearing structure has the defects of higher cost, risk of reliability and durability, difficult production of insulated parts of the outer ring and certain damage to a transmission system matched with the motor.

Therefore, it is a urgent problem for those skilled in the art to provide an electrostatic motor capable of rapidly detecting whether a shaft current is generated when a motor rotor is operated and timely eliminating the shaft current.

Disclosure of Invention

In view of the above, the present utility model provides an electrostatic motor for detecting shaft current, which aims to solve the problems in the background art, and can rapidly detect whether the motor rotor generates shaft current during operation, and timely eliminate the shaft current.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

an electrostatic motor for shaft current detection, comprising:

the stator assembly comprises end plates, support columns and first conducting strips, wherein the number of the support columns is an even number, two end plates are arranged, the two end plates are arranged at intervals, the even number of the support columns is distributed between the two end plates in an annular array, two ends of each support column are respectively connected with the end plates, and the first conducting strips are respectively sleeved on each support column;

the rotor assembly comprises a rotating shaft, a cylinder body and second conductive sheets, wherein two ends of the rotating shaft are respectively connected with two end plates in a rotating mode, the cylinder body is sleeved on the rotating shaft, so that the cylinder body is located at the center of the supporting column, the number of the second conductive sheets is equal to that of the first conductive sheets, and all the second conductive sheets are distributed on the cylinder body in an annular array;

one end of the positive electrode conducting wire is connected with the first conducting plates on the odd support columns in the positive even number, the other end of the positive electrode conducting wire is connected with a tip induction plate, and the tip induction plate is used for inducing the shaft current of the motor to be tested;

and one end of the negative electrode conducting wire is connected with the first conducting plates on the even support columns in the positive even number, and the other end of the negative electrode conducting wire is used for grounding.

Further, the first conductive sheet is provided with an extension section, the extension section points to the second conductive sheet on the cylinder body, and a gap exists between the extension section and the second conductive sheet.

The static motor for detecting the shaft current further comprises a rotary identification piece, wherein the rotary identification piece is arranged at the end part of the rotating shaft penetrating through the end panel.

Further, two rotation identification pieces are arranged, and the two rotation identification pieces are respectively arranged at two end parts of the rotating shaft.

Further, the positive and negative conductive lines are located outside of the two end plates, respectively.

The utility model provides an electrostatic motor for detecting shaft current, which also comprises a positive electrode conductive column and a negative electrode conductive column;

the positive electrode conductive posts are positioned on the end panel provided with one end of the positive electrode conductive wire, and are used for connecting the first conductive sheets on the odd support columns in the positive even number with the positive electrode conductive wire;

the negative electrode conductive post is positioned on the end panel provided with one end of the negative electrode conductive wire, and the negative electrode conductive post is used for connecting first conductive sheets on even support posts in the positive and even numbers with the negative electrode conductive wire.

The utility model provides an electrostatic motor for detecting shaft current, which further comprises a mounting column, wherein the mounting column is positioned on the end panel provided with one end of the positive electrode conducting wire, and the tip induction piece is mounted on the mounting column.

Further, the tip sensing piece has a serrated tip.

Compared with the prior art, the utility model discloses the static motor for detecting the shaft current, which can conduct the induction charges generated by the current of the motor shaft to the first conducting plate and the second conducting plate, so that whether the motor rotor generates the shaft current or not during operation can be detected rapidly, and the problem that a method and an instrument for detecting the shaft current are not available in the industry generally is solved; the utility model can lead out the shaft current to the end cover and the shell grounding point through the induction, conduction and lead out modes, thoroughly eliminates the shaft current, and solves the problems of complex structure, increased cost, poor reliability and durability and the like caused by the traditional modes of adding carbon brushes, protecting rings, adopting insulating bearing structures and the like for protecting the motor shaft current; the utility model not only can detect the shaft current, but also can eliminate the shaft current, has simple structure, is practical and reliable, is convenient to install, can finish the installation, detection, elimination and disassembly of equipment by only one common mechanical worker, greatly improves the stability and safety of the detected product, protects the bearing system of the detected product, prolongs the service lives of bearing balls and bearing oil films, and avoids the conditions of bearing burnout, forced shutdown, accidents and the like caused by the shaft current.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an electrostatic motor for shaft current detection according to the present utility model;

FIG. 2 is an exploded view of an electrostatic motor with shaft current detection according to the present utility model;

fig. 3 is a schematic structural diagram of an electrostatic motor with shaft current detection according to the present utility model at another view angle;

FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 3, in accordance with the present utility model;

FIG. 5 is a schematic view of a stator assembly according to the present utility model;

fig. 6 is a schematic structural view of a rotor assembly according to the present utility model.

Wherein: 1 is a stator assembly; 11 is an end panel; 12 are support columns; 13 is a first conductive sheet; 131 is an extension; 2 is a rotor assembly; 21 is a rotating shaft; 22 is a cylinder; 23 is a second conductive sheet; 3 is an anode conducting wire; 4 is a negative electrode conducting wire; 5 is a tip sensing piece; 6 is a rotary identification sheet; 7 is an anode conductive post; 8 is a negative electrode conductive column; 9 is a mounting post.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-6, an embodiment of the present utility model discloses an electrostatic motor for shaft current detection, including: a stator assembly 1, a rotor assembly 2, a positive conductive wire 3 and a negative conductive wire 4.

The stator assembly 1 comprises end plates 11, support columns 12 and first conducting strips 13, wherein the number of the support columns 12 is an even number, the number of the support columns 12 is two, the end plates 11 are arranged at intervals, the even number of the support columns 12 are distributed between the two end plates 11 in an annular array, two ends of each support column 12 are respectively connected with the end plates 11, and the first conducting strips 13 are respectively sleeved on each support column 12. The end panel 11 is circular sheet material, and the end panel 11 is non-conductive material such as plastics or polyurethane, and support column 12 is the hollow structure of cylinder, and first conducting strip 13 is the aluminium membrane, and aluminium conductivity is high and light in weight, is favorable to the conduction electric charge.

The rotor assembly 2 comprises a rotating shaft 21, a cylinder 22 and second conductive sheets 23, wherein two ends of the rotating shaft 21 are respectively connected with the two end plates 11 in a rotating way, the cylinder 22 is sleeved on the rotating shaft 21, so that the cylinder 22 is positioned at the center of the support column 12, the number of the second conductive sheets 23 is equal to that of the first conductive sheets 13, and all the second conductive sheets 23 are distributed on the cylinder 22 in an annular array. The cylinder 22 is hollow and cylindrical, so that the weight of the whole cylinder 22 is reduced, the rotational inertia of the cylinder 22 is reduced, the rotation is facilitated, the cylinder 22 is made of non-conductive materials such as plastics or polyurethane, and the second conductive sheet 23 is also an aluminum film.

One end of the positive electrode conducting wire 3 is connected with the first conducting plate 13 on the odd support columns 12 in the positive even number, the other end of the positive electrode conducting wire 3 is connected with the tip induction plate 5, and the tip induction plate 5 is used for inducing the shaft current of the motor to be tested.

One end of the negative electrode conductive wire 4 is connected to the first conductive sheet 13 on the even support column 12 in the positive even number, and the other end of the negative electrode conductive wire 4 is used for grounding.

It should be noted that: in this embodiment, the six support columns 12 are preferably arranged between the two end plates 11 in an annular array, and the clockwise or anticlockwise counting is carried out by taking one support column 12 as the starting support column 12, the first conductive sheets 13 on all odd support columns 12 in the six support columns 12 are connected in series through one end of the positive conductive wire 3, the other end of the positive conductive wire 3 is connected with the tip sensing sheet 5, the first conductive sheets 13 on all even support columns 12 in the six support columns 12 are connected in series through one end of the negative conductive wire 4, the other end of the negative conductive wire 4 is connected with the end cover or shell of the motor to be tested, the end cover and the shell of the motor to be tested are grounded, the most tip of the tip sensing sheet 5 is used to be close to the rotating shaft 21 of the motor to be tested, the tip discharge phenomenon is generated when the tip of the tip sensing sheet 5 is close to the rotating shaft 21 of the motor to be tested, and the charges generated by the axial current electric field are gathered and conducted to the first conductive sheet 13 on the odd support columns 12 through the positive electrode conductive wire 3, because the first conductive sheet 13 is an aluminum film, the sharp angle of the aluminum film is close to the second conductive sheet 23, which is favorable for discharging the surface of the aluminum film serving as the second conductive sheet 23, homopolar induced positive charges are generated, so that the aluminum film on the odd support columns 12 has positive charges, the second conductive sheet 23 on the corresponding cylinder 22 on the odd support columns 12 induces the same positive charges, the first conductive sheet 13 on the even support columns 12 is grounded through the negative electrode conductive wire 4, thus negative charges are generated on the first conductive sheet 13 on the even support columns 12, homopolar induced negative charges are also generated on the second conductive sheet 23 corresponding on the cylinder 22, and further the tip induction sheet 5, the positive electrode conductive wire 3, the first conductive sheet 13 on the odd support columns 12, the second conductive sheet 23, the first conductive sheet 13 on the even support column 12 and the negative conductive wire 4 form a loop, the induced charges generated by the current of the motor shaft to be tested are conducted to the first conductive sheet 13 and the second conductive sheet 23, and the first conductive sheet 13 on the three odd support columns 12 and the corresponding three second conductive sheets 23 on the cylinder 22 are provided with positive charges, while the first conductive sheet 13 on the three even support columns 12 and the corresponding three second conductive sheets 23 on the cylinder 22 are provided with negative charges, according to the principle that like repulsion and opposite attraction are matched with each other, the cylinder 22 is pulled to rotate by an angle, between pushing and pulling, stable rotation of the cylinder 22 is formed, the shaft current is detected through whether the cylinder 22 rotates, and meanwhile, the shaft current is led out to the end cover of the motor to be tested and the grounding point of the shell, so that the shaft current is thoroughly eliminated, thereby the defects of structure increase, poor reliability and poor durability and the like caused by the traditional modes of adding a protective ring to the protection of the motor shaft current, adopting an insulating bearing structure and the like are solved, and the problems of being unable to effectively implement the motor shaft current can not be limited in other cases when the motor shaft current is detected, and other number of support columns 12 can not be effectively operated, and other problems can be effectively limited when the motor shaft 12 is not run.

In a further embodiment of the utility model, the first conductive sheet 13 has an extension 131, the extension 131 points to the second conductive sheet 23 on the cylinder 22, and a gap exists between the extension 131 and the second conductive sheet 23. By providing a certain gap between the aluminum film as the first conductive sheet 13 and the aluminum film as the second conductive sheet 23, it is convenient to generate induced charges of the same polarity on the second conductive sheet 23 by the charges on the first conductive sheet 13, preferably, the shapes of the first conductive sheet 13 and the second conductive sheet 23 are isosceles trapezoids, the upper bottom (short side) of the isosceles trapezium is close to the second conductive sheet 23, and it is convenient to guide the charges on the first conductive sheet 13 onto the second conductive sheet 23 on the cylinder 22.

The electrostatic motor for shaft current detection according to the present utility model preferably further comprises a rotary identification piece 6, the rotary identification piece 6 being provided on an end of the rotary shaft 21 penetrating the end plate 11. The rotary marking sheet 6 is made of plastic or polyurethane, is light and thin and easy to process, has a triangular or pentagonal processing shape, and is convenient for the barrel 22 to rotate and drive the rotary marking sheet 6 to be easily observed.

In a further embodiment, two rotary identification pieces 6 are provided, and two rotary identification pieces 6 are provided at both end portions of the rotary shaft 21, respectively.

In a further embodiment, it is preferred that the positive electrode conductive wire 3 and the negative electrode conductive wire 4 are located outside the two end plates 11, respectively.

The electrostatic motor for shaft current detection provided by the utility model preferably further comprises a positive electrode conductive post 7 and a negative electrode conductive post 8;

the positive electrode conductive post 7 is positioned on an end panel 11 arranged at one end of the positive electrode conductive wire 3, and the positive electrode conductive post 7 is used for connecting the first conductive sheet 13 on the odd support columns 12 in the positive even number with the positive electrode conductive wire 3;

the negative electrode conductive posts 8 are located on an end plate 11 provided at one end of the negative electrode conductive wire 4, and the negative electrode conductive posts 8 are used to connect the first conductive pieces 13 on the even support posts 12 in the positive and even numbers with the negative electrode conductive wire 4.

The three positive electrode conductive columns 7 and the three negative electrode conductive columns 8 are respectively provided with three positive electrode conductive columns 7, the three positive electrode conductive columns 7 are arranged on one side end panel 11 of the positive electrode conductive wire 3, the three positive electrode conductive columns 7 correspond to the first conductive sheets 13 on the three odd support columns 12, the three positive electrode conductive columns 7 are respectively connected with the first conductive sheets 13 on the corresponding support columns 12, the three positive electrode conductive columns 7 are sequentially connected in series through one end of the positive electrode conductive wire 3, and the other end of the positive electrode conductive wire 3 is connected with the tip induction sheet 5 and used for inducing the shaft current of the tested motor; similarly, three negative electrode conductive columns 8 are arranged on one side end plate 11 of the negative electrode conductive wire 4, the three negative electrode conductive columns 8 correspond to the first conductive sheets 13 on the three even support columns 12, the three negative electrode conductive columns 8 are respectively connected with the first conductive sheets 13 on the corresponding support columns 12, the three negative electrode conductive columns 8 are sequentially connected in series through one end of the negative electrode conductive wire 4, and the other end of the negative electrode conductive wire 4 is used for being connected with an end cover or a shell of a tested motor so as to play a role in grounding.

The electrostatic motor for shaft current detection according to the present utility model preferably further comprises a mounting post 9, the mounting post 9 is located on an end plate 11 provided with one end of the positive electrode conductive wire 3, and the tip sensing piece 5 is mounted on the mounting post 9. The mounting posts 9 enable the fixation of the tip sensing piece 5.

In a further embodiment, the tip sensing piece 5 has a serrated tip. The tip induction sheet 5 is made of a thin conductive sheet material, such as a Q235A iron sheet, and the thickness is within 1mm, and is machined into a sawtooth-shaped top end in a machining mode, wherein the top end is a sharp angle, so that a tip discharge phenomenon is generated when the top end is close to the rotating shaft 21 of the motor to be tested, and charges generated by an axial current electric field are better gathered and introduced into the positive electrode conducting wire 3.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An electrostatic motor for shaft current detection, comprising:

the stator assembly comprises end plates, support columns and first conducting strips, wherein the number of the support columns is an even number, two end plates are arranged, the two end plates are arranged at intervals, the even number of the support columns is distributed between the two end plates in an annular array, two ends of each support column are respectively connected with the end plates, and the first conducting strips are respectively sleeved on each support column;

the rotor assembly comprises a rotating shaft, a cylinder body and second conductive sheets, wherein two ends of the rotating shaft are respectively connected with two end plates in a rotating mode, the cylinder body is sleeved on the rotating shaft, so that the cylinder body is located at the center of the supporting column, the number of the second conductive sheets is equal to that of the first conductive sheets, and all the second conductive sheets are distributed on the cylinder body in an annular array;

one end of the positive electrode conducting wire is connected with the first conducting plates on the odd support columns in the positive even number, the other end of the positive electrode conducting wire is connected with a tip induction plate, and the tip induction plate is used for inducing the shaft current of the motor to be tested;

and one end of the negative electrode conducting wire is connected with the first conducting plates on the even support columns in the positive even number, and the other end of the negative electrode conducting wire is used for grounding.

2. An electrostatic motor for shaft current detection according to claim 1, wherein the first conductive sheet has an extension thereon, the extension points to the second conductive sheet on the cylinder, and a gap exists between the extension and the second conductive sheet.

3. The electrostatic motor of claim 1, further comprising a rotary flag disposed on an end of the shaft extending through the end plate.

4. An electrostatic motor for shaft current detection according to claim 3, wherein two of the rotation identification pieces are provided, and the two rotation identification pieces are provided at both end portions of the rotation shaft, respectively.

5. An electrostatic motor for shaft current detection according to claim 1, wherein the positive and negative conductive wires are located outside of the two end plates, respectively.

6. The electrostatic motor of claim 5, further comprising a positive conductive post and a negative conductive post;

the positive electrode conductive posts are positioned on the end panel provided with one end of the positive electrode conductive wire, and are used for connecting the first conductive sheets on the odd support columns in the positive even number with the positive electrode conductive wire;

the negative electrode conductive post is positioned on the end panel provided with one end of the negative electrode conductive wire, and the negative electrode conductive post is used for connecting first conductive sheets on even support posts in the positive and even numbers with the negative electrode conductive wire.

7. An electrostatic motor for shaft current sensing according to claim 6, further comprising a mounting post on the end plate at one end of which the positive conductive wire is disposed, the tip sensing tab being mounted on the mounting post.

8. An electrostatic motor for shaft current detection according to claim 1, wherein the tip sensing piece has a serrated tip.