1. A machine that converts mechanical energy into DC electrical energy.
2. It is mainly used as a DC motor required for DC motors, electrolysis, electroplating, electric smelting, charging and excitation of alternators. Although power rectifier components are used to convert AC to DC where DC is needed, DC motors cannot be compared to AC generators in terms of ease of use, operational reliability and certain work performances.
1. Working principle
The working model of the DC motor when the generator is running is as shown in the figure. Brushes A and B in the figure are connected to direct current. external load, and the motor is connected by a main motor drags to rotate in the reverse directionclockwise. At present, the figure shows that the direction of the induced potential of component side ab is from end b to end a, the direction of induced potential of component side cd is from end d to end c and the direction of the potential induced on the component side ab goes from end b to end a. The current ia in the component is Bbrush → d → c → b → a → A, the component sides ab and cd generate an electromagnetic force f acting in the tangential direction of the armature circumference will generate an electromagnetic torque Tem. is clockwise and opposite to the direction of rotation of the motor. After rotating 180 degrees, the direction of current ia in the element is from brush B → a → b → c → d → brush A. The direction of current I in the external circuit remains unchanged and the direction of the electromagnetically generated torque Tem remains clockwise.
2. Model ofwork
It can be seen from the above analysis that the DC motor has the following characteristics when operating as a generator:
(1) In each case, the current ia flowing in an armature coil is alternating and the induced electromotive force e generated at the same time is also alternating.
(2) There is a direct potential between the brushes, and the induced electromotive force e and the current ia in the element have the same direction.
(3) The magnetic field generated by the armature current is also fixed in space.
(4) n is in the opposite direction to the electromagnetic torque Tem, and the electromagnetic torque Tem acts as a brake.
What is the principle of a generator (images and text)
Electricity originally existed in nature. Later, people gradually studied it and were finally able to do it. produce it themselves.
Electricity is produced by a generatorelectromagnetic induction using magnets and coils, which was researched and invented by Faraday.
Electricity used today can be roughly divided into electricity generated by generators and electricity converted from chemical energy (such as batteries). In addition, electricity is also produced from sunlight, and other methods of generating electricity are still under development. ?
Of course, the electricity used in homes is produced by generators. ?
Now let’s talk about the principles of electricity generation! ?
To produce electricity, you need magnets and coils that generate electricity. ?
Magnets have a magnetic force that attracts metals such as iron. The range reached by this force is called the magnetic field. ?
Move the coil in this magnetic field and the coil will generate electricity. However,In a strong magnetic field, if the coil cannot be moved (without causing a change in magnetic force), electricity cannot be produced. ?
In other words, changes in magnetic force cause the coil to generate electricity. This principle is called electromagnetic induction and the current generated is called induced current. ?
When the magnet is close to the coil, current will flow to the coil in the direction of the arrow. ?
Conversely, if the magnet is moved away from the coil, current will flow in the opposite direction of the arrow. Of course, if the magnet is not moved, the magnetic field will not change and no electricity will be generated. ?
This electromagnetic induction can also be used in a simple generator for bicycles. ?
If you install a generator on the tire of a bicycle, the magnet inside the generator will rotate with the help of the rotation of the tire. At that moment, the iThe strength of the magnetic field near the coil changes, which can cause an induced current to flow to the coil. ?
This is the principle of electricity production, which can turn on the bicycle lights. ?
What is closely related to the production of electricity is the generator of the electricity company. ?
Hydroelectric power generation uses hydraulic power to turn a propeller mounted on a generator, replacing the rotation of bicycle tires, causing the magnet to rotate and produce electricity. ?
Thermal or nuclear power generation first uses a boiler or atomic furnace to create high temperatures, then uses the heat to evaporate water to produce steam. These vapors are sprayed towards the turbine installed on the generator. to produce electricity. The machine runs to produce electricity.
Definition of generator Onegenerator refers to a mechanical device that converts other forms of energy into electrical energy. It is driven by a water turbine, steam turbine, diesel engine or other electrical machinery. convert water, air, The energy generated by fuel combustion or nuclear fission is converted into mechanical energy and transmitted to the generator, which is then converted into electrical energy. Principle of the generator How does a generator work? Let’s take diesel generators and gasoline generators as examples. In both cases, each cylinder does work in a certain order. The thrust acting on the piston becomes the force that rotates the crankshaft through the connecting rod, thus causing the crankshaft to rotate. By installing the brushless synchronous alternator coaxially to the crankshaft of the electric machine, the rotation of the electric machine can be used to drive the rotor of the generator.misser. Using the principle of "electromagnetic induction", the generator will produce induced electromotive force. and a current can be generated through the closed charging loop. Common Types of Generators There are many types of generators, and the most common ones are: The first is the wind turbine, which is a new system of generating electricity that is cheap, reliable and without greenhouse effect. gas emissions, which are increasingly used around the world. Next comes the hydraulic generator, an electrical machine that converts the kinetic energy and gravitational potential energy of water into mechanical work, as in the Three Gorges in China. Then there is the synchronous generator, one of the most commonly used alternators. In modern power industry, it is widely used in hydroelectric power generation, thermal power generation, nuclear power generation and production of energy by diesel engine.