CN203397581U

CN203397581U - An Ampere force experiment instrument

Info

Publication number: CN203397581U
Application number: CN201320517121.4U
Authority: CN
Inventors: 冯容士; 李鼎; 刘杭州
Original assignee: Shandong Yuanda Net & Multimedia Co Ltd
Current assignee: Shandong Yuanda-Llongwill Educational Science And Technology Ltd
Priority date: 2013-08-23
Filing date: 2013-08-23
Publication date: 2014-01-15
Anticipated expiration: 2023-08-23

Abstract

Provided is an Ampere force experiment instrument which comprises a pedestal, a coil, an angle rotating disc, magnets, a micro-force sensor, a current sensor, and a student power supply. The angle rotating disc is installed on the pedestal through a rotating shaft and is provided with rotating angle scales. Two magnets are fixed on the angle rotating disc. The N pole of one magnet faces the S pole of the other magnet. A vertical column is disposed on the pedestal and on one side of the angle rotating disc. A support is fixedly installed on the vertical column. A pointer is disposed on the lower part of the vertical column and over the angle rotating disc. The micro-force sensor is installed on the support. The coil is suspended on the micro-force sensor and is arranged between the two magnets. Taps are disposed on the coil according to the number of turns, wherein one tap is a common tap and the others are turn taps. One end of the current sensor is connected with the common tap on the coil. The student power supply, the current sensor, and the coil are connected in series to form a closed loop circuit. The experiment instrument is capable of independently researching the influence of a certain variable on Ampere force and the relation between the variable and the Ampere force, and has the advantages of accurate counting and easy manipulation.

Description

Ampère force tester

Technical field

The utility model relates to a kind of for measuring the tester of Ampère force (acting force of magnetic field to electric current), electric current and electric current and magnetic direction, belongs to physics experiment teaching technical field.

Background technology

Magnetic field is commonly referred to Ampère force to the acting force of electric current, lacks and can directly measure Ampère force, electric current, direction of current and magnetic direction angle always, to probe into the experimental provision of concluding relation between above-mentioned each physical quantity in current teaching.Teaching material for the description of Ampère force is: the acting force that electrified wire is subject in magnetic field.Electric current is that I, the long Ampère force size being subject in uniform magnetic field B for the straight wire of L are: F=ILBsin (θ), wherein (θ) is the angle between direction of current and magnetic direction.Therefore, want to verify accurately conclusions, must quantitatively measure five physical quantitys of angle of Ampère force, electric current, magnetic induction, conductor length and direction of current and magnetic induction direction.And in traditional experiment, adopt dynamometer, reometer, ruler to complete the measurement of three physical quantitys, because the sensitivity of dynamometer is not high more, want to obtain larger Ampère force, must strengthen magnetic induction or strengthen supply current, but being controlled by above two factors, Ampère force is generally less than 1N.So, with dynamometer, accurately measure the value of Ampère force, be very difficult, therefore, quantitative experiment has been difficult to.

Development along with electronic technology and infotech, the sensor of ergometry and electric current is applied in this experiment gradually, but due to the imperfection of measurement model, makes making little progress of this experiment, even the empirical model that has part and sensor to be used in conjunction with, but the many drawbacks that also exist.As disclosed in CN2011200649485 a kind of " Ampere force experiment apparatus " described experimental provision, it changes supplier of electricity is that direction by regulating winding (Timing Belt dynamic sensor) realizes to the angle with magnetic direction, this mode is measured certain several fixed angle, cannot make angle at the uniform velocity change, while can not viewing angle changing, the result of Ampère force dynamic change, and complicated operation, used very inconvenient.This experiment instrument magnetic field used is to realize with electromagnet, due to the sensitvity constraint of its sensor, wants to obtain stable Ampère force, needs larger supporting for electric current, and requirement for experiment condition improves, and has certain unsafe factor.

Summary of the invention

The deficiency that the utility model exists for existing Ampère force experimental technique, provides a kind of counting accurate, simple to operate, can measure accurately the Ampère force tester of experimental data.

Ampère force tester of the present utility model, adopts following technical solution:

This Ampère force tester, comprises base, coil, angle disk, magnet, Micro-force sensor, current sensor and student power source; On base, by rotating shaft, angle disk is installed, angle disk is provided with rotational angle groove, is fixed with two blocks of magnet on angle disk, and the N utmost point of two blocks of magnet is extremely relative with S; A side at angle disk on base is provided with column, is installed with support on column, and column bottom is provided with pointer above angle disk, and Micro-force sensor is rack-mount; On Micro-force sensor, be hung with coil, coil, between two blocks of magnet, arranges tap according to the number of turn on coil, and one of them is common tap, and all the other are number of turn tap, and current sensor one end is connected with the common tap on coil; Current sensor is connected with the negative pole of student power source and the common tap of coil, and the positive pole of student power source is connected with a number of turn tap of coil, and student power source, current sensor and coil are cascaded, and forms closed-loop path.

Binding post and socket are set on described base, the quantity of binding post is consistent with the tap number on coil, each binding post connects one to one by each terminals in wire and socket respectively, each tap on described coil is all connected to one and takes out line plug, and this is taken out line plug and is connected with the socket on base.

During experiment, a number of turn tap, student power source positive pole on the common tap of student power source negative pole, current sensor, coil, coil are cascaded, form closed-loop path; Micro-force sensor and current sensor are connected to computing machine by data acquisition unit, by two sensor zeroings, open student power source, regulate student power source voltage, record Micro-force sensor data; Rotational angle rotating disk changes the angle of magnetic field and hot-wire coil, observing Micro-force sensor registration changes, keep electric current and coil turn constant, adjust angle disk position, make magnetic direction parallel with direction of current, observing Micro-force sensor registration is zero, changes angle disk angle, record Micro-force sensor registration and change, probe into the relation of the angle theta between Ampère force F and direction of current and magnetic direction; Keep angle theta and the number of turn constant, change supply current, measure one group of data, probe into the relation of Ampère force F and electric current I; Keep angle theta and electric current I constant, change the number of turn (being equivalent to change the length L of wire) of coil, measure one group of data, the relation of probing into Ampère force F and conductor length L.Finally sum up checking F=BILsin(θ).

The utility model records Ampère force size automatically by Micro-force sensor, and higher because of Micro-force sensor sensitivity, the variation that can record 0.001N, has guaranteed the success ratio of testing; The numerical value of current sensor measurement electric current, meets the standard of instruments used for education to the requirement of supply current; As long as rotational angle rotating disk can change direction of current and magnetic direction angle, and can rotate at the uniform velocity continuously; By student power source, control electric current, when changing coil turn by plug binding post, can change electrified wire length, can study separately some variablees to the impact of Ampère force size and relation, count accurate, simple to operate.

Accompanying drawing explanation

Fig. 1 is one-piece construction schematic diagram of the present utility model.

Fig. 2 is the structural representation of base in the utility model.

In figure: 1, Micro-force sensor, 2, hook, 3, coil, 4, magnet, 5, angle disk, 6, base, 7, binding post, 8, socket, 9, take out line plug, 10, pointer, 11, column, 12, current sensor, 13, bolt, 14, support, 15, bearing, 16, rotating shaft.

Embodiment

As shown in Figure 1, Ampère force tester of the present utility model comprises base 6, coil 3, angle disk 5, magnet 4, column 11, support 14, pointer 10, Micro-force sensor 1 and current sensor 12.As Fig. 2, on base 6, by rotating shaft 16, bearing 15 is installed, angle disk 5 is arranged on bearing 15, can rotate around bearing 15, and angle disk 5 is provided with rotational angle groove.On angle disk 5, be fixed with the permanent magnet 4 that two N utmost points are extremely relative with S, form certain uniform magnetic field space.A side at angle disk 5 on base 6 is provided with column 11, on column 11, by bolt 13, be installed with the support 14 that is I type, column 11 bottoms are provided with pointer 10 above angle disk 5, and pointer 10 can up-down adjustment, can contact with angle disk 5 if desired, play certain braking action.Micro-force sensor 1 is arranged on support 14.On the hook 2 of Micro-force sensor 1, be hung with coil 3.Coil 3 is between two blocks of magnet 4, the interior winding around of coil 3 is also provided with a plurality of taps by the different numbers of turn and (three taps is set in the present embodiment, one of them tap is common tap, another two taps that are respectively 100 circles and 200 circles), each tap is connected to and is taken out line plug 9 by a split conductor (three heart yearns).Binding post 7 and socket 8 are set on base 6, the quantity of binding post 7 is consistent with the tap number on coil 3, a black binding post and a plurality of red binding post are set, black binding post 7 by socket 8 with take out line plug 9 and be connected with the common tap of coil 3, red binding post by socket 8 with take out line plug 9 and be connected with the tap of coil 3 each numbers of turn.Each binding post connects one to one by each terminals in wire and socket 8 respectively, when taking out line plug 9 insertion socket 8, black binding post is by taking out the common tap conducting in line plug 9 and coil 3, each red binding post by take out line plug 9 respectively with each number of turn (100 circles and 200 circles) tap conducting of coil 3.

Current sensor 12 is connected with black binding post (common tap) with the negative pole of student power source (separately joining), student power source is anodal to be connected with one of them red binding post, be that student power source, current sensor 12, coil 3 are cascaded, form closed-loop path.Micro-force sensor 1 and current sensor 12 are connected to computing machine (data acquisition unit and computing machine do not draw) by data acquisition unit, data acquisition unit gathers the data of Micro-force sensor 1 and current sensor 12 simultaneously and data is sent into computing machine, by display, shows.By Micro-force sensor 1 and the automatic record data of current sensor 12 or figure line, counting is synchronous and accurate; As long as rotational angle rotating disk 5, just can change direction of current and magnetic direction corner dimension, by changing the anodal red binding post connecting of student power source, just can change coil turn.

During use, by signal wire one end connection data collector, the other end connects Micro-force sensor 1 and current sensor 12.Data acquisition unit is connected to computing machine by usb data line.Coil 3 and current sensor 12 series connections enter student power source (coil 3 enters student power source by binding post 7 series connections, and current sensor 12 is by the binding post access of connecting).Current sensor 12 use signal wires are received on data acquisition unit.Two sensors are returned to zero respectively, opening power then, regulating power source voltage, to appropriate location, records the data of Micro-force sensor 1.Rotational angle rotating disk 5 changes the angle of magnetic field and hot-wire coil 3, can observe Micro-force sensor 1 registration and change thereupon.Keep the number of turn of size of current and coil 3 constant, adjust angle disk 5 positions, while making magnetic direction parallel with direction of current, the registration of Micro-force sensor 1 is zero, change the angle of angle disk 5, the registration that records Micro-force sensor 1 changes, and by formula, verifies F=BILsin(θ).

Claims

1. an Ampère force tester, comprises base, coil, angle disk, magnet, Micro-force sensor, current sensor and student power source; It is characterized in that: on base, by rotating shaft, angle disk is installed, angle disk is provided with rotational angle groove, on angle disk, be fixed with two blocks of magnet, the N utmost point of two blocks of magnet is extremely relative with S; A side at angle disk on base is provided with column, is installed with support on column, and column bottom is provided with pointer above angle disk, and Micro-force sensor is rack-mount; On Micro-force sensor, be hung with coil, coil, between two blocks of magnet, arranges tap according to the number of turn on coil, and one of them is common tap, and all the other are number of turn tap, and current sensor one end is connected with the common tap on coil; Current sensor is connected with the negative pole of student power source and the common tap of coil, and the positive pole of student power source is connected with a number of turn tap of coil, and student power source, current sensor and coil are cascaded, and forms closed-loop path.

2. Ampère force tester according to claim 1, it is characterized in that: binding post and socket are set on described base, the quantity of binding post is consistent with the tap number on coil, each binding post connects one to one by each terminals in wire and socket respectively, each tap on described coil is all connected to one and takes out line plug, and this is taken out line plug and is connected with the socket on base.