CN211979027U

CN211979027U - Ammeter based on digital potentiometer

Info

Publication number: CN211979027U
Application number: CN202020621975.7U
Authority: CN
Inventors: 陈迪峰
Original assignee: Taizhou Vocational and Technical College
Current assignee: Taizhou Vocational and Technical College
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-11-20
Anticipated expiration: 2030-04-23

Abstract

The utility model relates to an ammeter based on a digital potentiometer, which comprises a shell, wherein the front end of the shell is provided with a display screen, the lower part of the display screen is symmetrically provided with wire pressing knobs which are respectively used for connecting the anode and the cathode, the shell is internally provided with a cavity, a corner measuring cavity is arranged above the cavity, a horseshoe-shaped magnet is arranged in the cavity, a rotating shaft positioned in the middle of the horseshoe-shaped magnet is rotatably connected in the cavity, the rotating shaft is provided with a coil, both sides of the rotating shaft are rotatably provided with a helical spring, the helical spring is respectively connected with two ends of the coil by short electrical connection points, the other end of the spiral spring is respectively connected with the positive and negative pressing line knobs, the upper part of the rotating shaft extends into the corner measuring cavity, and a digital potentiometer is embedded in the inner wall above the corner measuring cavity and used for detecting the angle change of the rotating shaft and outputting the angle change in a feedback mode by using multiple signal types.

Description

Ammeter based on digital potentiometer

Technical Field

The utility model relates to an ampere meter technical field, more specifically relate to an ampere meter based on digital potentiometer.

Background

The ammeter is made by the action of magnetic field force applied to the current conductor in the magnetic field. The ammeter is internally provided with a permanent magnet, a magnetic field is generated between poles, a coil is arranged in the magnetic field, two ends of the coil are respectively provided with a hairspring spring, the springs are respectively connected with a binding post of the ammeter, the springs and the coil are connected through a rotating shaft, and a pointer is arranged at the front end of the rotating shaft opposite to the ammeter. When current flows, the current passes through the magnetic field along the spring and the rotating shaft, and the current cuts the magnetic induction line, so that the coil deflects under the action of the magnetic field force to drive the rotating shaft and the pointer to deflect. Since the magnitude of the magnetic field force increases with the increase of the current, the magnitude of the current can be observed through the deflection degree of the pointer, which is called a magnetoelectric ammeter and is used in a laboratory at ordinary times. The range of the ammeter is generally 0-0.6A and 0-3A.

Because the current ammeter is a mechanical principle, the pointer driven by rotation deflects through the rotating shaft driven by the test coil, so that the numerical value indicated by the pointer can be visually observed on the dial plate to realize current measurement, and the current detection error is larger, the reading error of naked eyes is larger and the digital reading cannot be realized due to slight mechanical friction or part damage. The prior ammeter has the remarkable advantages of inflexible mechanical adjustment and use, low adjustment precision, easy pollution and damage of contact, no vibration resistance, poorer anti-magnetic interference, large volume, short service life and the like, and can replace mechanical ammeters in many fields.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims to provide an ampere meter based on digital potentiometer.

In order to solve the above problems, the utility model adopts the following technical proposal.

An ammeter based on a digital potentiometer comprises a shell, wherein a display screen is arranged at the front end of the shell, wire pressing knobs respectively used for connecting an anode and a cathode are symmetrically arranged below the display screen, a cavity is arranged in the shell, a corner measuring cavity is arranged above the cavity, a horseshoe-shaped magnet is arranged in the cavity, a rotating shaft positioned in the middle of the horseshoe-shaped magnet is rotatably connected in the cavity, a coil is arranged on the rotating shaft, spiral springs are rotatably arranged on two sides of the rotating shaft and are respectively connected with electrical short points at two ends of the coil, the other end of each spiral spring is respectively connected with the wire pressing knobs of the anode and the cathode, the upper part of the rotating shaft extends into the corner measuring cavity, the digital potentiometer is embedded in the inner wall above the corner measuring cavity and is used for detecting the angle change of the rotating shaft and outputting the angle change through feedback of various signal types, the processor is arranged in the shell and connected with the digital potentiometer, and the processor is connected with the display screen.

Furthermore, the digital potentiometer is a non-contact potentiometer, the type of the digital potentiometer is WDH22, the angle change of the rotating shaft is detected in a non-contact mode, signals of the angle change are fed back through various processes, and the signals are converted into corresponding current signals through comparison and analysis, so that the current measurement is realized, and the reading error is avoided.

Furthermore, the casing is PVC plastics, and not only the quality is little, prevents falling, plays insulating effect moreover, guarantees that inside each part normal steady operation.

In particular, the processor introduces a corresponding calculation program in an internal system thereof according to the linear proportional relation between the angle change magnitude and the current magnitude.

Compared with the prior art, the utility model has the advantages of: the utility model discloses a pivot angle change survey digital potentiometer WDH22 of no physical contact, it is high to adjust the precision, does not have the noise, has very long working life, no mechanical wear for automatic control system can realize the accurate measurement to the angle position, and measuring numerical value can pass through display screen digital display, has eliminated the error and the trouble of artifical reading, for the application prospect that ampere meter technical progress is through favouring.

Drawings

Fig. 1 is a top view of an ammeter according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of an ammeter of an embodiment of the present invention;

fig. 3 is a cross-sectional view a-a of fig. 2.

In the figure: 1. the device comprises a shell, a display screen 2, a cavity 3, a horseshoe-shaped magnet 4, a rotating shaft 5, a coil 6, a spiral spring 7, a rotation angle measuring cavity 8, a digital potentiometer 9, a processor 10 and a line pressing knob 11.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-3, an ammeter based on a digital potentiometer comprises a housing 1, a display screen 2 is disposed at the front end of the housing 1, wire pressing knobs 11 for connecting an anode and a cathode are symmetrically disposed below the display screen 2, a cavity 3 is disposed inside the housing 1, a rotation angle measuring cavity 8 is disposed above the cavity 3, a horseshoe-shaped magnet 4 is disposed in the cavity 3, a rotating shaft 5 is rotatably connected to the middle of the horseshoe-shaped magnet 4 and is rotatably connected to the cavity 3, a coil 6 is disposed on the rotating shaft 5, coil springs 7 are rotatably disposed on two sides of the rotating shaft 5, the coil springs 7 are respectively connected to two ends of the coil 6 by short electrical connections, the other ends of the coil springs 7 are respectively connected to the anode and cathode wire pressing knobs 11, the upper portion of the rotating shaft 5 extends into the rotation angle measuring cavity 8, and a digital potentiometer 9 is embedded in the inner wall above the rotation angle measuring, the digital potentiometer 9 is used for detecting the angle change of the rotating shaft 5 and outputting the angle change in a feedback mode through multiple signal types, a processor 10 is arranged in the shell 1, the processor 10 is connected with the digital potentiometer 9, and the processor 10 is connected with the display screen 2.

In one technical solution, the digital potentiometer 9WDH22 is advantageously a non-contact potentiometer, which detects the change of the angle of the rotating shaft 5 in a non-contact manner, converts the signal of the change of the angle into a corresponding current signal through various processing and feedback and comparative analysis, and realizes the measurement of the current through the conversion of the processor 10, thereby avoiding the error of the reading.

In a technical scheme, profitable, casing 1 is PVC plastics, and not only the quality is little, prevents falling, plays insulating effect moreover, guarantees that inside each part normal steady operation.

The operation steps of the ammeter in the specific current measuring process are as follows:

firstly, a terminal of current to be measured is contacted with a positive and negative wire pressing knob 11, then the processor 10, the display screen 2 and the digital potentiometer 9WDH22 are opened to enable the processor, the display screen 2 and the digital potentiometer 9WDH22 to be in a working state, when the current passes through the coil 6, the current cuts a magnetic induction wire, magnetic field force is generated, the coil 6 is pushed to rotate, the coil 6 rotates to drive the rotating shaft 5 to rotate, the angle change of the rotating shaft 5 is detected by the digital potentiometer 9, the digital potentiometer 9 feeds back and outputs the angle change to the processor 10 by using various signal types, the processor 10 is processed and operated to convert the angle change into the current with corresponding magnitude, and simultaneously, the digital signal is transmitted to the display screen 2 to be displayed and read.

Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above is only a preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.

Claims

1. An ampere meter based on a digital potentiometer is characterized in that: the device comprises a shell, a display screen is arranged at the front end of the shell, line pressing knobs which are respectively used for connecting an anode and a cathode are symmetrically arranged below the display screen, a cavity is arranged in the shell, a corner measuring cavity is arranged above the cavity, a horseshoe-shaped magnet is arranged in the cavity, a rotating shaft which is positioned in the middle of the horseshoe-shaped magnet is rotationally connected in the cavity, a coil is arranged on the rotating shaft, spiral springs are rotationally arranged on two sides of the rotating shaft and are respectively connected with two ends of the coil in an electric short point connection mode, the other end of each spiral spring is respectively connected with the anode line pressing knob and the cathode line pressing knob, the corner measuring cavity is extended into the upper portion of the rotating shaft, a digital potentiometer is embedded in the inner wall of the upper portion of the corner measuring cavity and is used for detecting the angle change of the rotating shaft and outputting the angle, the processor is connected with the digital potentiometer and the display screen.

2. The digital potentiometer based current meter according to claim 1, wherein: the digital potentiometer is a non-contact potentiometer.

3. The digital potentiometer based current meter according to claim 1, wherein: the shell is made of PVC plastic.