Electrostatic motor with shaft current detection

Abstract

The application discloses a kind of electrostatic motor of shaft current detection, it is related to shaft current detection technical field, comprising: stator assembly, including end panel, support column and first conducting sheet, support column is equipped with positive even number, support column is annular array and is arranged between two end panels, first conducting sheet is sleeved on support column;Rotor assembly, including shaft, cylinder and second conducting sheet, two ends of shaft are respectively rotationally connected with two end panels, cylinder is sleeved on shaft, the number of second conducting sheet is equal to first conducting sheet, all second conducting sheet is annular array and is arranged on cylinder;Positive pole conducting wire, one end is connected with the first conducting sheet on the odd support column in positive even number, another end of positive pole conducting wire is connected with sharp end sensing sheet;Negative pole conducting wire, one end is connected with the first conducting sheet on the even support column in positive even number.The application can quickly detect whether shaft current is generated when motor rotor operates, and timely eliminate shaft current.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shaft current detection, and more particularly to a static motor for detecting shaft current. BACKGROUND

[0002] Motors are widely used in various industries and are the heart of various devices that provide power. With the progress of the industry and the development of equipment, the power of single industrial equipment is becoming larger and larger, which also leads to the increase of power of power equipment. The increase of motor power will inevitably lead to the increase of current on the line. When the motor is running, a large current passes through the stator coil to generate a stator magnetic field, which is coupled with the rotor magnetic field to keep the motor running. However, due to the insufficient concentricity precision of the rotor machined or the imbalance of the stator magnetic field, when the alternating magnetic flux appears, the shaft voltage will be induced on the motor shaft, thereby generating shaft current in the motor shaft, the inner ring of the bearing and the outer ring of the bearing. Since the shaft voltage is very low, but the loop resistance is very small, the shaft current is often very large. The shaft current can break the bearing oil film, cause the bearing balls to be electrically eroded, and cause the bearing to burn out, resulting in forced shutdown, accidents and other situations. There is usually no effective method and instrument for detecting shaft current in the industry. Generally, some redundant measures are taken after comprehensive analysis of the possibility of generating shaft current in the motor, for example: 1. Using a carbon brush to contact one side of the shaft and the other side to ground and discharge, but the disadvantage is that the carbon brush will wear out over time, and carbon powder may fall into the motor and cause short circuit of electronic components. 2. Using a conductive ring to contact the shaft, the disadvantage is high cost, and it needs to be adjusted with the shell and the shaft, which cannot be used in high-speed running motors. 3. Using an insulating bearing structure, the disadvantage is high cost, and there are risks of reliability and durability. The outer ring insulation part is not easy to produce, and there is a certain damage to the transmission system of the motor.

[0003] Therefore, how to provide a static motor capable of quickly detecting whether shaft current is generated when the motor rotor is running and eliminating the shaft current in time is a problem that those skilled in the art need to solve. SUMMARY

[0004] Therefore, the present application provides a static motor for detecting shaft current, which aims to solve the problems in the background art and can quickly detect whether shaft current is generated when the motor rotor is running and eliminate the shaft current in time.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A static motor for detecting shaft current, comprising:

[0007] The stator assembly comprises end face plates, support columns and first conductive pieces, the support columns are provided in a positive even number, the end face plates are provided in two, the two end face plates are arranged at intervals, the positive even number of support columns are arranged in a ring array between the two end face plates, the two ends of each support column are connected with the end face plates respectively, and the first conductive pieces are arranged on each support column in a sleeved mode;

[0008] The rotor assembly comprises a rotating shaft, a cylinder and second conductive pieces, the two ends of the rotating shaft are rotationally connected with the two end face plates respectively, the cylinder is sleeved on the rotating shaft so that the cylinder is located at the central position of the support columns, the second conductive pieces are equal in number to the first conductive pieces, and all the second conductive pieces are arranged in a ring array on the cylinder;

[0009] The positive pole conducting wire is connected with the first conductive pieces on the odd support columns in the positive even number at one end, and the other end of the positive pole conducting wire is connected with a sharp end sensing piece, and the sharp end sensing piece is used for sensing the shaft current of the measured motor.

[0010] The negative pole conducting wire is connected with the first conductive pieces on the even support columns in the positive even number at one end, and the other end of the negative pole conducting wire is used for grounding.

[0011] Further, the first conductive pieces are provided with extension sections, the extension sections are directed to the second conductive pieces on the cylinder, and there is a gap between the extension sections and the second conductive pieces.

[0012] According to the electrostatic motor for detecting shaft current provided by the application, the rotating identification piece is arranged on the end of the rotating shaft penetrating through the end face plate.

[0013] Further, the rotating identification piece is provided in two, and the two rotating identification pieces are arranged on the two ends of the rotating shaft respectively.

[0014] Further, the positive pole conducting wire and the negative pole conducting wire are located outside the two end face plates respectively.

[0015] According to the electrostatic motor for detecting shaft current provided by the application, the positive pole conducting column and the negative pole conducting column are further arranged.

[0016] The positive pole conducting column is arranged on the end face plate where the one end of the positive pole conducting wire is arranged, and the positive pole conducting column is used for connecting the first conductive pieces on the odd support columns in the positive even number with the positive pole conducting wire.

[0017] The negative pole conducting column is arranged on the end face plate where the one end of the negative pole conducting wire is arranged, and the negative pole conducting column is used for connecting the first conductive pieces on the even support columns in the positive even number with the negative pole conducting wire.

[0018] The electrostatic motor for shaft current detection provided by the application further comprises a mounting column, which is arranged on the end panel provided with one end of the positive conductive wire, and the tip sensing sheet is mounted on the mounting column.

[0019] Further, the tip sensing sheet has a jagged top end.

[0020] Compared with the prior art, the electrostatic motor for shaft current detection provided by the application can conduct the induced electric charge generated by the measured motor shaft current to the first conductive sheet and the second conductive sheet, and then quickly detect whether the shaft current is generated when the motor rotor operates, thereby solving the problem that there is usually no effective method and instrument for detecting the shaft current in the industry. The application can completely eliminate the shaft current by the induction-conduction-induction mode, and the motor can induce the shaft current to the end cover and the shell grounding point, thereby solving the problems of complex structure, increased cost, poor reliability and durability, etc. caused by the traditional methods of adding carbon brushes, adding protective rings, and adopting an insulating bearing structure. The application not only can detect the shaft current, but also can eliminate the shaft current, and has the advantages of simple structure, practicality, reliability, and easy installation. Only one ordinary mechanic is needed to complete the installation, detection, elimination and disassembly of the equipment, which greatly improves the stability and safety of the measured product, protects the bearing system of the measured product, prolongs the service life of the bearing ball and the bearing oil film, and avoids the situation that the shaft current causes the bearing to burn out, forced shutdown, and accidents, etc. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the provided drawings.

[0022] Figure 1 The structural schematic diagram of the electrostatic motor for shaft current detection provided by the application;

[0023] Figure 2 The exploded view of the electrostatic motor for shaft current detection provided by the application;

[0024] Figure 3 The structural schematic diagram of the electrostatic motor for shaft current detection provided by the application in another perspective;

[0025] Figure 4 The sectional view of the electrostatic motor for shaft current detection provided by the application in A-A direction; Figure 3

[0026] ​Figure 5 A structural schematic diagram of a stator assembly provided by the present application is shown in the figure;

[0027] Figure 6 A structural schematic diagram of a rotor assembly provided by the present application is shown in the figure.

[0028] Wherein: 1 is a stator assembly; 11 is an end plate; 12 is a support column; 13 is a first conductive sheet; 131 is an extension section; 2 is a rotor assembly; 21 is a rotating shaft; 22 is a cylinder; 23 is a second conductive sheet; 3 is a positive conductive wire; 4 is a negative conductive wire; 5 is a tip sensing sheet; 6 is a rotating identification sheet; 7 is a positive conductive column; 8 is a negative conductive column; 9 is a mounting column. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0030] Referring to Figures 1-6 The embodiments of the present application disclose an electrostatic motor for detecting shaft current, comprising: a stator assembly 1, a rotor assembly 2, a positive conductive wire 3 and a negative conductive wire 4.

[0031] The stator assembly 1 comprises an end plate 11, a support column 12 and a first conductive sheet 13. The support column 12 is provided in a positive even number, the end plate 11 is provided in two, the two end plates 11 are arranged at intervals, the positive even number of support columns 12 are arranged in a ring array between the two end plates 11, the two ends of each support column 12 are connected with the end plates 11 respectively, and the first conductive sheet 13 is sleeved on each support column 12 respectively. The end plate 11 is a circular plate material, the end plate 11 is made of a non-conductive material such as plastic or polyurethane, the support column 12 is a cylindrical hollow structure, and the first conductive sheet 13 is an aluminum film. The conductivity of aluminum is high and the weight is light, which is more conducive to the conduction of electric charge.

[0032] The rotor assembly 2 comprises a rotating shaft 21, a cylinder 22 and a second conductive sheet 23. The two ends of the rotating shaft 21 are rotatably connected with the two end plates 11 respectively, the cylinder 22 is sleeved on the rotating shaft 21 so that the cylinder 22 is located at the center position of the support column 12, the number of the second conductive sheet 23 is equal to that of the first conductive sheet 13, and all the second conductive sheets 23 are arranged in a ring array on the cylinder 22. The cylinder 22 is in a hollow cylindrical shape, which is convenient for reducing the weight of the overall cylinder 22, reducing the moment of inertia of the cylinder 22, and facilitating rotation. The material of the cylinder 22 is a non-conductive material such as plastic or polyurethane, and the second conductive sheet 23 is also an aluminum film.

[0033] One end of the positive conducting wire 3 is connected to the first conducting sheet 13 on the odd support column 12 in the positive even number, and the other end of the positive conducting wire 3 is connected with the pointed end sensing sheet 5, which is used to sense the shaft current of the measured motor.

[0034] One end of the negative conducting wire 4 is connected to the first conducting sheet 13 on the even support column 12 in the positive even number, and the other end of the negative conducting wire 4 is used for grounding.

[0035] It should be noted that in the present embodiment, the support column 12 is preferably six, six support columns 12 are arranged in an annular array between the two end panels 11, taking one of the support columns 12 as the starting support column 12, the first conductive sheet 13 on all odd-numbered support columns 12 in the six support columns 12 is 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, and the first conductive sheet 13 on all even-numbered support columns 12 in the six support columns 12 is 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 measured, the end cover and shell of the motor to be measured are grounded, the sharpest end of the tip sensing sheet 5 is used to approach the rotating shaft 21 of the motor to be measured, the tip of the tip sensing sheet 5 is placed close to the rotating shaft 21 of the motor to be measured, and the tip discharge phenomenon is generated, and the charges generated by the shaft current electric field are gathered and conducted to the first conductive sheet 13 on the odd-numbered support column 12 through the positive conductive wire 3. Since the first conductive sheet 13 is an aluminum film, the sharp corner of the aluminum film is close to the second conductive sheet 23, which is beneficial to the surface discharge of the aluminum film as the second conductive sheet 23, generates same polarity induced positive charge, so that the aluminum film on the odd-numbered support column 12 has positive charge, and the second conductive sheet 23 on the corresponding cylinder 22 on the odd-numbered support column 12 induces the same positive charge. Therefore, the first conductive sheet 13 on the even-numbered support column 12 is grounded through the negative conductive wire 4, so that a negative charge is generated on the first conductive sheet 13 on the even-numbered support column 12, and for the same reason, the same polarity induced negative charge is also generated on the corresponding second conductive sheet 23 on the cylinder 22, thereby forming a loop between the tip sensing sheet 5, the positive conductive wire 3, the first conductive sheet 13 on the odd-numbered support column 12, the second conductive sheet 23, the first conductive sheet 13 on the even-numbered support column 12 and the negative conductive wire 4, and conducting the induced charge generated by the shaft current of the motor to be measured to the first conductive sheet 13 and the second conductive sheet 23. Since the first conductive sheet 13 on the three odd-numbered support columns 12 and the corresponding three second conductive sheets 23 on the cylinder 22 all have positive charges, and the first conductive sheet 13 on the three even-numbered support columns 12 and the corresponding three second conductive sheets 23 on the cylinder 22 all have negative charges, according to the principle of same polarity repulsion and different polarity attraction, the repulsion and attraction cooperate to pull the cylinder 22 to rotate by one degree. Between push and pull, it forms a stable rotation of the cylinder 22, and the shaft current is detected by whether the cylinder 22 rotates or not. At the same time, by leading out the shaft current to the grounding point of the end cover and shell of the motor to be measured, the shaft current is completely eliminated, thereby solving the problems of complex structure, increased cost, poor reliability and durability, etc. caused by traditional motor shaft current protection methods such as adding carbon brush, adding protective ring, adopting insulation bearing structure, etc., and the problem of being unable to quickly and effectively detect whether there is shaft current during motor operation. In other embodiments, the support column 12 can be arranged as other positive even numbers, and the number of support columns 12 is not limited here.

[0036] In a further embodiment of the present application, the first conductive sheet 13 has an extension 131 pointing to the second conductive sheet 23 on the cylinder 22, and there is a gap between the extension 131 and the second conductive sheet 23. By having 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 from the charges on the first conductive sheet 13. Preferably, the first conductive sheet 13 and the second conductive sheet 23 are both isosceles trapezoids, and the upper base (short side) of the isosceles trapezoid is close to the second conductive sheet 23, so as to facilitate the introduction of charges on the first conductive sheet 13 to the second conductive sheet 23 on the cylinder 22.

[0037] According to the electrostatic motor for shaft current detection provided by the present application, preferably, it further comprises a rotating identification sheet 6 arranged on the end of the rotating shaft 21 penetrating the end panel 11. The rotating identification sheet 6 is made of plastic or polyurethane, which is light and easy to process, and the processed shape is a triangle or a pentagon, so as to facilitate easy observation when the cylinder 22 rotates to drive the rotating identification sheet 6.

[0038] In a further embodiment, two rotating identification sheets 6 are provided, and the two rotating identification sheets 6 are arranged at the two ends of the rotating shaft 21 respectively.

[0039] In a further embodiment, preferably, the positive conductive wire 3 and the negative conductive wire 4 are respectively located outside the two end panels 11.

[0040] According to the electrostatic motor for shaft current detection provided by the present application, preferably, it further comprises a positive conductive column 7 and a negative conductive column 8.

[0041] The positive conductive column 7 is arranged on the end panel 11 at one end of the positive conductive wire 3, and the positive conductive column 7 is used to connect the first conductive sheet 13 on the odd support column 12 in the positive even number to the positive conductive wire 3.

[0042] The negative conductive column 8 is arranged on the end panel 11 at one end of the negative conductive wire 4, and the negative conductive column 8 is used to connect the first conductive sheet 13 on the even support column 12 in the positive even number to the negative conductive wire 4.

[0043] The positive conductive column 7 and the negative conductive column 8 are each provided with three, three positive conductive columns 7 are arranged on the end panel 11 on one side of the positive conductive wire 3, three positive conductive columns 7 correspond to the first conductive sheet 13 on the three odd support columns 12, three positive conductive columns 7 are connected with the first conductive sheet 13 on the corresponding support column 12 respectively, three positive conductive columns 7 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 pointed end sensing sheet 5, and is used for sensing the shaft current of the measured motor; similarly, three negative conductive columns 8 are arranged on the end panel 11 on one side of the negative conductive wire 4, three negative conductive columns 8 correspond to the first conductive sheet 13 on the three even support columns 12, three negative conductive columns 8 are connected with the first conductive sheet 13 on the corresponding support column 12 respectively, three negative conductive columns 8 are connected in series through one end of the negative conductive wire 4, and the other end of the negative conductive wire 4 is used for being connected with the end cover or the shell of the measured motor, so as to play a grounding role.

[0044] According to the electrostatic motor for detecting shaft current provided in the application, preferably, the electrostatic motor further comprises a mounting column 9, the mounting column 9 is arranged on the end panel 11 provided with one end of the positive conductive wire 3, and the pointed end sensing sheet 5 is arranged on the mounting column 9. The mounting column 9 can fix the pointed end sensing sheet 5.

[0045] In a further embodiment, the pointed end sensing sheet 5 has a sawtooth-shaped top end. The pointed end sensing sheet 5 is made of a thin conductive sheet material, such as Q235A iron sheet, and has a thickness of less than 1 mm. The sawtooth-shaped top end is processed by mechanical processing. The top end is a sharp corner, which facilitates the occurrence of pointed end discharge when the top end is close to the rotating shaft 21 of the measured motor, and better collects the charges generated by the shaft current electric field and introduces them into the positive conductive wire 3.

[0046] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0047] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the application. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrostatic motor with shaft current detection, characterized by, The utility model relates to a kind of motor rotor shaft current sensor, including: Stator assembly, including end panel, support column and first conductive sheet, the support column is equipped with positive even number, the end panel is equipped with two, two The end panel is spaced apart, positive even number The support column is arranged in annular array between two The end panel, the both ends of each The support column are connected with The end panel respectively, each The support column is respectively equipped with The first conductive sheet on it; Rotor assembly, including rotating shaft, barrel and second conductive sheet, the both ends of the rotating shaft are rotatably connected with two end panels respectively, the barrel is sleeved on the rotating shaft, so that the barrel is located at the center position of the support column, the second conductive sheet is equal in number with the first conductive sheet, and all the second conductive sheet is arranged in annular array on the barrel; Positive pole conducting wire, one end of the positive pole conducting wire is connected with the first conductive sheet on the odd support column in positive even number, the other end of the positive pole conducting wire is connected with a sharp end sensing sheet, and the sharp end sensing sheet is used to sense the shaft current of the motor to be measured; Negative pole conducting wire, one end of the negative pole conducting wire is connected with the first conductive sheet on the even support column in positive even number, and the other end of the negative pole conducting wire is used for grounding.

2. An electrostatic motor of shaft current detection according to claim 1, characterized in that, The first conductive sheet has an extension section, the extension section points to the second conductive sheet on the barrel, and there is a gap between the extension section and the second conductive sheet.

3. The electrostatic motor of shaft current detection according to claim 1, characterized in that, It also includes a rotating identification sheet, which is arranged on the end of the rotating shaft penetrating the end panel.

4. An electrostatic motor of shaft current detection according to claim 3, characterized in that, The rotating identification sheet is provided with two, and the two rotating identification sheets are arranged on the two ends of the rotating shaft respectively.

5. The electrostatic motor of shaft current detection according to claim 1, characterized in that, The positive pole conducting wire and the negative pole conducting wire are respectively located outside the two end panels.

6. An electrostatic motor of shaft current detection according to claim 5, characterized in that, It also includes a positive pole conductive column and a negative pole conductive column. The positive pole conductive column is located on the end panel where one end of the positive pole conducting wire is arranged, and is used to connect the first conductive sheet on the odd support column in positive even number with the positive pole conducting wire. The negative pole conductive column is located on the end panel where one end of the negative pole conducting wire is arranged, and is used to connect the first conductive sheet on the even support column in positive even number with the negative pole conducting wire.

7. An electrostatic motor for shaft current detection according to claim 6, characterised in that, It also includes a mounting column, which is located on the end panel where one end of the positive pole conducting wire is arranged, and the sharp end sensing sheet is mounted on the mounting column.

8. The electrostatic motor of shaft current detection according to claim 1, characterized in that, The sharp end sensing sheet has a jagged top end.

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