Sometimes, having bought an electric motor for a car from your hands, you may find that there is absolutely no documentation in the box from under it. Then you will have to determine the number of revolutions permissible for it yourself.
Instructions
Step 1
All asynchronous electric motors can be divided into three groups according to the number of rotor revolutions per minute. The first is 1000 rpm. In fact, this figure is slightly exaggerated, since the motor is asynchronous. Its rotor makes a slightly smaller number of revolutions per minute (950-980), and for convenience it was decided to round off the value. In engines of the second group, the number of rotor revolutions is 1500 per minute (in fact, 1420-1480). In the third group, the rotor turns around itself 3000 times per minute (in reality, 2900-2980).
Step 2
To determine which group your electric motor belongs to, you first need to open one of its covers. Find a coil of winding that can consist of either one piece or three or four. There should be several such coils in the engine, you will need one of them, which is easiest to consider.
Step 3
The coils are connected to each other by the necessary details that may interfere with their examination, and which in no case should be disconnected from each other. Take a closer look at the chosen one and try to determine its size relative to the stator ring.
Step 4
This distance does not have to be determined with an accuracy of a millimeter; approximate calculations are quite suitable. In the event that the size of the coil covers one second of the stator ring, then the rotor speed will be 3000 rpm. If it covers a third of the ring, then this is the engine of the second group, the rotor of which will rotate at a speed of 1500 rpm. If its size is equal to one fourth in relation to the ring, then rotation will occur at a speed of 1000 rpm. It should be remembered that such figures only approximately reflect the real picture of rotation.
