How is the electricity generator made
Constant increase in the cost of electricitymakes many think about the need to organize an independent system of their own power supply. In addition, sometimes this is the only way to equip the equipment with the proper quality. The search for solutions to the problem of self-voltage stress leads to the need to understand how the generator is made.
The prerequisites for creating a generating device
To learn how to make an electricity generator,it follows with the recollection of the basics of electrotechnical science. In the section on engines, it is clearly stated that any of them can work not only as a consumer, performing the conversion of charge operation to mechanical energy of shaft rotation, but also in the opposite mode, converting the mechanical moment to the potential at the terminals. This feature is called the law of reversibility of electrical machines. Actually, this is the basis of how the generator is made.
Principle of operation
To understand how a generator is made, you needto represent the processes occurring in the engine during operation. Let us consider a three-phase model. When power is applied to the stator winding leads (stationary part), a magnetic field appears in it, the lines of tension intersecting the closed winding of the rotor (rotating "drum"). Due to this, a current is induced in the latter, which generates its own magnetic field. The interaction of these two fields creates a torque. It's that simple.
Hence, proceeding from the law of reversibility,it is necessary to untwist the rotor by an external action, and to remove tension from the stator windings. In generators sold in retail chains, torque creates a gasoline engine. Although the efficiency of such a system is small, it works.
People who have already studied how a generator is made know,that there are a number of features of the connected circuits. Uncoupling the shaft and connecting the load to the terminals, it will not be possible to fully open the potential of the device. The reason for this lies in the fact that the current does not arise in the windings of the rotor (the magnetization is small and extinct). To solve this problem, an efficient solution is used: a block of capacitors included in a triangle is placed between the three terminals of the three-phase motor in question. That is, to each corner the wire from the stator winding terminal is fed, from here three outputs to the load go. Non-electrolytic capacitors, such as MBGT, MBGO, etc., should be used. Their voltage should be not less than 600 V. The capacitance depends on the load (the more powerful it is, the higher the capacitor class) and the characteristics of the engine. For example, for a 2 kVA generator, the battery capacity is at least 28 μF.
Without the load, the generator can not be usedit is recommended because of the resulting heating. It should also be taken into account that for a three-phase electric motor, which generates 220 V in the generator mode, the power will be one-third of the rating.
The speed of rotation of the shaft must be not lower than synchronous. Otherwise, there is a decrease in frequency and / or voltage.
Most often people have a question: "How to make a wind generator?" Everything is logical: the wind is a free resource that is always available. The solution includes: engine; Blades on the shaft, adjusted to a certain angle; block of capacitors. If the low-voltage output is initially planned, an inverter and a rechargeable battery will additionally be required.</ p>>