The three-phase electric motor does not contain brushes that can wear out and require periodic replacement. It is less efficient than collector, but much more efficient than asynchronous single-phase. Its disadvantage is its considerable size.
Instructions
Step 1
Locate the nameplate on the three-phase motor. Two voltages are indicated on it, for example: 220/380 V. You can power the motor with any of these voltages, it is only important to correctly connect its windings: for the smaller of the indicated voltages - with a triangle, for the larger - with a star.
Step 2
Open the motor terminal box. In it you will find six contacts arranged in three rows. To connect the windings with a triangle, put three vertical jumpers on the contacts, and connect the three lead wires to them. If it is necessary to connect the windings with a star, connect the upper three terminals with a jumper, which you do not connect to anything else (including ground or neutral wire), and connect three supply wires to the remaining three contacts. Before closing the cover, if it is metal, make sure that it under no circumstances touches any live parts. If there are tools for securing the lead-in cable, use them.
Step 3
Connect the motor housing to ground, connect the supply wires to the phase terminal of the supply triple automatic machine (in no case separate single automatic machines), and do not connect the neutral wire anywhere. Make sure it is safe to start the engine, then turn on the machine. The engine will run. Now turn off the machine, and the speed will begin to decrease. Gradually they will become so small that you can see the direction of rotation of the shaft.
Step 4
If it turns out that the motor rotates in the required direction, the connection can be considered complete. If not, with the motor de-energized, swap any two phases on it. Close the terminal cover, then check the direction of rotation again. If the phase change is done correctly, the shaft will now rotate in the required direction.
