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How to get the DC power supply and become a hunter's heart disease.

There are 6 ways to obtain DC power, namely chemical battery, fuel cell, thermoelectric battery, solar cell, DC generator, and AC to DC.

Among them, the last solution of alternating current to direct current, hunters don’t even think about it, they just pass.

What do you want, the reason is very simple, where does the alternating current come from? I still need a generator, so why don't I just get direct current.

The direct current is to use the motor to drive the armature to rotate at a constant speed in the counterclockwise direction. The coil sides ab and cd respectively cut the magnetic lines of force under the magnetic poles of different polarities, and induce electromotive force.

In fact, it is to convert the alternating electromotive force induced in the armature coil into a direct current electromotive force when it is drawn from the brush end by the commutator and the commutation effect of the brush.

And because the electromotive force drawn by the brush A through the commutator segment is always the electromotive force in the side of the coil that cuts the N-pole magnetic field line.

So brush A always has a positive polarity, and in the same way, brush B always has a negative polarity.

Therefore, the brush end can draw out the pulsating electromotive force with the same direction but varying size.

The induced electromotive force in the coil is an alternating electromotive force, while the electromotive force at the AB end of the brush is a direct current electromotive force.

When the armature of the generator is driven by other machines to rotate counterclockwise at a uniform speed, the coil abcd moves to cut the magnetic field lines.

When the coil turns to a certain position, it can be judged by the right-hand rule that the direction of the induced electromotive force generated by the conductor in the ab segment is b→a;

The direction of the induced electromotive force generated by the conductor in the cd segment is d→c, then the brush A in contact with the slider 1 is the positive electrode, and the brush B in contact with the slider 2 is the negative electrode.

When the coil turns to the neutral plane (the plane perpendicular to the magnetic field lines), the induced electromotive force gradually decreases from the maximum value to zero.

When the coil turns over the neutral plane, the direction of the induced electromotive force generated by the conductor in the ab segment is from a→b; the direction of the induced electromotive force in the conductor in the cd segment is from c→d.

At this time, the brush A is changed to contact with the slider 2 of the commutator, and the brush B is in contact with the slider 1.

With the continuous rotation of the coil in the magnetic field, the induced electromotive force between the commutator slides 1 and 2 is an alternating electromotive force whose magnitude and direction vary with time.

However, the brushes A and B alternately contact the commutator vanes 1 and 2 that rotate at the same time as the coil, so a pulsating DC electromotive force is generated between the brushes A and B, and the output from A and B is DC.

A DC generator consists of a stationary part and a rotating part.

The stationary part is called the stator, which includes the casing and the magnetic poles, which of course are used to generate a magnetic field, and the rotating part is called the rotor, also known as the armature.

The armature iron core is cylindrical and is made of laminated silicon steel sheets. The surface is punched with a slot, and the armature winding is placed in the slot.

The commutator is the structural feature of the DC motor. The commutator is the two arc-shaped conductive slides 1 and 2 connected to both ends a and d of the coil abed. These two arc-shaped conductive slides are insulated from each other. as the coil turns.

Two stationary brushes A and B are pressed tightly on the commutator slide and connected with the external circuit.

In order to reduce the pulsation of the DC power output by the DC generator, the armature winding is not a single coil, but consists of many coils. These coils in the winding are evenly distributed in the slots of the armature core, and the ends of the coils are connected to onto the corresponding slide of the commutator.

The commutator is actually composed of many arc-shaped conductive slides, which are insulated from each other with mica sheets.

The greater the number of sliders in the coil and the commutator, the smaller the DC pulsation generated, which of course also brings difficulties in manufacturing.

The magnitude of the induced electromotive force generated by the DC generator is proportional to the magnetic induction intensity of the stator magnetic field and the rotational speed of the armature.

The rated voltage output of small and medium DC generators is not high, 115 volts, 230 volts, 460 volts.

The rated voltage output of large DC generators is about 800 volts, and DC generators with higher voltage output belong to the scope of high-voltage special units and are rarely used.

The structural form of the rotating electrical machine must have a structure that meets the requirements of both electromagnetic and mechanical aspects, and the rotating electrical machine must have two parts, static and rotating.

In the static part, the main magnetic pole is an electromagnet, and the main magnetic pole and the commutation pole of the iron core are laminated and fastened by 1-1.5 mm thick steel plate punching.

The commutating pole is also called an additional pole or an interpole. The commutating pole is installed between the two main magnetic poles and is also composed of an iron core and a winding. The iron core is generally made of a whole piece of steel or steel plate.

The base is usually welded by cast iron or thick iron plate, which has two functions, fixing the main magnetic pole, the commutation pole and the end cover, as part of the magnetic circuit, and the part where the magnetic flux passes through the base is called the yoke

The brush device, which introduces or draws DC voltage and DC current, consists of a brush, a brush holder, a brush holder and a copper wire braid.

The rotating part and the armature core are used for two purposes. As the main part of the main magnetic circuit, the armature winding is embedded, which is usually made of 0.5mm thick silicon steel sheets.

The armature winding, the main circuit part of the DC motor, is used to generate electromotive force through current and induction to realize electromechanical energy conversion. It is composed of many coils connected according to certain rules, components and embedding methods.

The commutator is an important part of the DC motor, and its function is to convert the DC current passing through the brush into the alternating current in the winding or the alternating electromotive force in the winding to the DC electromotive force on the brush end.

The structure of large generators is a 3-phase alternator, and in order to increase the power generation capacity, the output voltage of the generator is usually about several thousand volts, and according to P=UI, the current can be reduced to reduce the loss of the wire.

The stator has 3 windings~www.wuxiamtl.com~ are placed at an angle of 120 degrees, so that one of the 2 endpoints of the 3 windings is bundled together, that is, the neutral line (zero line) and the other 3 The wire at the other end of each winding is the phase wire (live wire).

The rotor is usually a 2-6 pole rotor. Since the number of poles of the rotor directly determines the frequency of power generation, the power supply is 50HZ, that is, 50 times of cutting magnetic field lines per second, or 3000 cutting magnetic field lines per minute.

At this time, if it is a single pole (the rotor with only one electromagnet), it needs 3000 rpm, and if you use a 2-pole, it only needs 1500 rpm.

6 poles only need 500 revolutions (the formula is 3000 revolutions per minute ÷ number of poles = rotational speed).

And each of these poles is actually a winding, they pass the carbon brush and the current receiving ring (not a commutator, it is a kind of ring, which allows electricity to flow into the rotor but does not affect the rotor's operation) to send the stator to the stator. A small part of the electricity that comes out is rectified and sent to the rotor for excitation.

As long as the excitation current is controlled, the magnetic field strength can be controlled, and the power generation voltage and current can be controlled.

Chapter 0235 Announcement of the battery