Everyone knows the problem of the gradual depletion of natural, fuel resources such as oil, coal, peat, oil shale and natural gas. The future belongs to alternative energy sources, some of which are already used by man (the energy of the atom, the energy of falling water, which turns into electricity, and others).
Instructions
Step 1
AC motors are divided into two large classes: synchronous and asynchronous.
The fundamental difference between the first and the second is that in asynchronous motors you can change the speed of the output end of the shaft, which will increase the service life of the equipment and reduce energy costs. One of the most important characteristics of any electric motor, be it synchronous or asynchronous, is its power. The power of the electric motor, as a rule, is indicated in its technical passport.
Step 2
If the document has been lost or this important characteristic is not indicated at all, then the power can be determined from the data of the stator core. The product of a constant, depending on the dimensions of the machine and its speed, the square of the inner diameter of the stator, its length (including ventilation ducts), synchronous speed (determined using a tachometer) by ten to the sixth power is the desired value of the electric motor power.
Step 3
Another way to determine power is similar to a high school physics lab. Turn on the electric motor, measure the voltage and current of each phase on it using a voltmeter and ammeter, respectively (devices must be connected in series). Then you calculate the total power using a very simple formula. The found voltage is multiplied by the sum of the currents in phases.
Step 4
You can also take measurements from the electric motor (lengths, shaft diameters) and determine which series your motor belongs to from the reference book. Knowing the series, you will also learn the power, which is given in this guide.
