CN2386505Y - Strong electromagnet - Google Patents

Abstract

The utility model relates to a teaching instrument for demonstrating the strong magnetic performance of an electromagnet and the generating mechanism of the electromagnet in physical, electric engineering and natural teaching. The back parts of the existing annular electromagnet and armature circular plate are respectively provided with a handle, the back part of the annular electromagnet is fixedly provided with a battery box capable of containing a dry battery (used as a power supply), and then the utility model is formed. When the utility model is energized, magnetic attraction which is not less than 60 kilogram force is generated between the annular electromagnet and the armature circular plate which are attached with each other, and the utility model can not be pulled apart by two opposite people.

Description

Strong electromagnet

The utility model be a kind of can be at physics, electrotechnics and the ferromagnetic teaching demonstration instrument when magnetic, the particularly magnetic circuit of demonstration electromagnet is closed in the teaching naturally.How it also can not draw away this mode to the handle on draw ring shape electromagnet and the armature plectane and shows that the magnetic pull of electromagnet is strong with double, although it is only powered with a joint general dry battery.

Compare in existing similar demonstration instrument---hang counterweight and show power type electromagnet, the more obvious use of its effect is more convenient, interest is stronger.

The purpose of this utility model is to provide a kind of and has that aforementioned functional, teaching efficiency are obvious, easy to use, simple structure and rich interesting physics, electrician with demonstrate magnetic, particularly the ferromagnetism function of electromagnet and the instruments used for education of mechanism of production in the teaching naturally.

Below in conjunction with accompanying drawing structure of the present utility model and principle are done a brief introduction.Fig. 3 is an outside drawing.

The utility model is made of ring electromagnet, armature and breaker bolt three parts.As sectional view Fig. 1, ring electromagnet partly comprises iron core 1, coil 2, coil rack 3, battery case 4 and shakes hands 5; The armature part is made up of armature plectane 6 and handle 7; Other is furnished with a breaker bolt 8, and the center pit that passes armature plectane 6 before being used for demonstrating is screwed to the center screw 9 of electromagnet core 1, and its effect is just in case demonstration is unsuccessful, and armature is drawn back, and two the people who draws can not fallen or bump against on what yet.Among Fig. 3, connect the crocodile clip 1 of magnet coil, if clamp the outer connector lug 2 of battery case, circuit is just connected.At this moment if armature is just accord with on electromagnet, then the magnetic pull of the two will be not less than 60 kilograms, and two men that hold handle can not draw away drawing also.

Why strong electromagnet can produce so big magnetic force, mainly is because magnetic circuit wherein is closed, and all magnetic induction line nearly all is distributed in unshakable in one's determination and the armature and forms in the closed magnetic circuit, as Fig. 2.The close applying of electromagnet and armature makes magnetic resistance minimum, makes magnetic flux near maximal value; In addition, the thickness of winding wire and the number of turns have also been got optimum value.

Characteristics of the present utility model are: one, the demonstration effect obviously, excellent and come in and go out unexpected: only can produce big magnetic pull like this as power supply with a joint common batteries.Two, power supply---be contained on the electromagnet once the joint dry cell, needn't connect external power in addition, easy to use.Three, the appropriate to the occasion student of allowing of demonstration participates in can enlivening classroom atmosphere to drawing, and excites learning interest.

Claims (5)

1, a kind of physics, electrician and being used in the teaching is naturally demonstrated the demonstration instruments used for education strong electromagnet of the ferromagnetism and the mechanism of production thereof of electromagnet, and it is characterized in that: a handle respectively is equipped with at the back of ring electromagnet and armature plectane.

2, according to wanting the described strong electromagnet of claim 1, it is characterized in that: the back of ring electromagnet is equipped with the battery case that can only adorn a joint dry cell or other and is fixed a device that saves dry cell.

3, according to wanting the described strong electromagnet of claim 1, it is characterized in that: coil rack is made with transparent material.

4, according to wanting the described strong electromagnet of claim 1, it is characterized in that: adopt breaker bolt to connect armature plectane and ring electromagnet.

5, according to wanting the described strong electromagnet of claim 1, it is characterized in that: with the switch of a crocodile clip as circuit.

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