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Home > Mall Dynamic > How To Convert DC Motor To AC (Briefly Describe The Method OF Converting DC Motor To AC)
None of the most important battles of the 19th century were fought not over land or resources, but over the establishment of the type of electricity that powers our buildings.
In the late 1800s, American electrical pioneer Thomas Edison (1847-1931) went to great lengths to prove that direct current (DC) was a better way to provide power than alternating current (AC). His Nemesis was Nikola Tesla (1856-1943). Edison tried all sorts of cunning ways to convince people that AC was too dangerous, from electrocuting elephants to (rather slyly) supporting the use of AC in the electric chair for executions. Even so, Tesla's system won the day, and the world has been running on almost all AC power ever since.
The only problem is that while many of our appliances are designed to run on alternating current, small generators often produce direct current. This means that if you want to run AC-powered gadgets in your mobile home using a DC car battery, you need a device that converts DC to AC - a so-called inverter. Let's take a closer look at these gadgets and see how they work!
When science teachers explain the basic concept of electricity as a stream of electrons, they are usually talking about direct current (DC). We learned that electrons work a bit like a row of ants, moving along with a packet of electrical energy, much like ants carry leaves. This is a good enough analogy for something like a basic flashlight, where we have a circuit (a complete electrical circuit) that connects the battery, the lamp, and the switch, and electrical energy is systematically transferred from the battery to the lamp until all of the battery's energy has been exhausted.
In larger household appliances, electricity works differently. The power supply from the wall outlet is based on alternating current (AC), where the power is switched around 50-60 times per second (in other words, the frequency is 50-60 Hz). It's hard to understand how alternating current provides energy when it keeps changing its direction of travel! If the electrons coming out of your wall socket go, say, a few millimeters down a cable and then have to reverse direction and come back again, how do they get to the light on your desk to get it lit?
The answer is simple. Imagine a cable running between a lamp and a wall full of electrons. When you tap the switch, all the electrons filling the cable vibrate back and forth in the filament of the bulb - this rapid movement converts electrical energy into heat, making the bulb glow. Electrons don't necessarily have to travel in circles to transfer energy: in alternating current, they just "run in place."
One of Tesla's legacies (and the legacy of his business partner, Westinghouse owner George Westinghouse) is that most appliances in our homes are specifically designed to run on AC power. Appliances that require direct current but must be powered from an AC outlet require an additional device called a rectifier, usually made of electronic components called diodes, to convert alternating current to direct current.
Inverters do the opposite, and it's easy to understand how it works. Suppose you have a battery in your flashlight and the switch is on, so the direct current flows through the circuit, always in the same direction, like a race car on a track. Now, what if you take the battery out and turn it around. Assuming it fits the other way, it will almost certainly still power the flashlight, and you won't notice any difference in the light you get - but the current will actually flow in the opposite way. Let's say you have lightning-fast hands and are dexterous enough to reverse the battery 50 to 60 times per second. You will then become a kind of mechanical inverter that converts the battery's direct current into alternating current with a frequency of 50-60 Hertz.
Of course, the kind of inverters you buy at an appliance store don't work exactly that way, though some are indeed mechanical: they use electromagnetic switches that open and close at high speeds to reverse the direction of current. Inverters like these typically produce what's called a square-wave output: the current either flows one way or the other, or it immediately switches between the two states:
This sudden power reversal can be quite brutal for some forms of electrical equipment. In a normal AC power supply, the current is gradually exchanged from one direction to another in a sine-wave pattern, as follows:
Electronic inverters can be used to produce this smooth variation of AC output from DC input. They use electronic components called inductors and capacitors to make the output current rise and fall more slowly than the sudden on/off commutator output you get with a basic inverter.
An inverter can also be used with a transformer to change a certain DC input voltage to a completely different AC output voltage (higher or lower), but the output power must always be less than the input power: It can be seen from the conservation of energy that inverters and transformers cannot emit more power than they absorb, and when the current flows through various electrical and electronic components, some energy is necessarily lost in the form of heat. In practice, inverters are typically more than 90% efficient, although basic physics tells us that some energy - no matter how little - is always wasted somewhere!
Dc motor is a kind of motor that uses the magnetic field generated by DC current to act on the conductor in the armature, making the armature produce rotation. The AC motor is a kind of motor that uses the magnetic field generated by the AC current to act on the conductor in the armature, making the armature produce rotation. The difference between DC motors and AC motors is mainly the type of input power is different, DC motors need DC power, and AC motors need AC power.
The principle of DC motor conversion to AC is to convert direct current through the converter into AC, the converter can convert direct current into AC, the principle is to use the switching characteristics of electronic components, by changing the on-off state of the switch, so that DC current through the converter to produce AC current effect.
Method of converting a DC motor into alternating current
The inverter method is to pass the direct current through the inverter and convert it into alternating current. The inverter is an electronic component that can convert direct current into alternating current. The principle is to use the switching characteristics of the electronic components and change the on-off state of the switch to produce the effect of alternating current after the DC current passes through the inverter.
The alternator method is to rotate the rotor of the DC motor and generate alternating current through the alternator. The alternator is a kind of motor that can convert mechanical energy into electrical energy. The principle is to use the effect of induced electromotive force when the rotor moves in the magnetic field.
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