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3-phase Line Connection

3-phase Line Connection

How to operate properly a 3-phase motor using Single-phase supply

April 28, 2019

A single section is applied to a combination of windings coinciding with a begin condenser asynchronous with the third winding. Three-phase motors can run on the single section as promptly as single


The number of phases on the motor is set by however the motor is wound. it’s simple to seek out what percentage phases your motor has by gazing one among 2 factors. First, you’ll check the motor plate knowledge that is typically situated on a paper or metal label hooked up to the aspect of the motor. Second, you’ll merely verify the number of electrical leads starting off of the motor.

Connection Diagram :

phase motors. the sole drawback for either motor is beginning. Sometimes 3-phase motors are purchased to be used on the single section if three-phase provisioning is anticipated. the facility rating desires to be five hundredths larger than for a comparable single section motor to make up for one unused winding.

3-phase AC motor uses three section power offer 3 pH scale 220v, 380v, 400v, 415v, 480v, etc. however in some actual applications, we’ve single section power provides solely 1 pH scale 110v, 220v, 230v, 240v, etc. particularly in home appliances. within the case to run the three-phase machines on single section power provides.

Moreover, the motor acts as a 3-phase generator. 3 section power could also be abroach faraway from the 3 stator windings for powering alternative 3-phase instrumentation. The capacitor provides an artificial section more or less midway 90o between the 180o single section power supply terminals for starting.

How it Working :

First, you get the three-part motor turning it (manually, or better, with a little a hundred and ten v motor), so activate the 220 (connected to 2 legs) it’ll run. it’ll not run at rated power, or swimmingly, however, it’ll run (at speed). this can be OK for a few machines. currently for a deception.

This works best if the primary motor may be a larger HP (2 vs 1), or higher speed rating (3400 vs 1750) than the slave. Older, “beefy” motors square measure desirable, because of their mass. A 3 HP, 3400 revolutions per minute motor works nicely.


Take a second (free, same size or smaller) three-part motor, and connect it to the primary (three leg switch, and zing!, the second motor activates instantly, and each motor runs smoothly!, with a lot of HP than with simply 220. the primary motor is acting sort of a “generator” to supply the third leg. this can be not “full 3 part power”, however it works quite nicely. The 220 provides power to each motor, with extra wire to attach them. will you be able to can connect extra motors conjointly?

It is associate degree recent technique, celebrated principally solely to recent tinkerers and therefore the like. If you’re trying to find a contemporary day resolution, have a glance at our AC Drive management panels that may conjointly run three-part motors on single part power together with 120VAC wall shops.

The reason for this can be that if you are attempting to start out a much bigger load than your master motor, you will reverse the rotation direction of the master (3 part motors may be wired to run either direction). A large/fast motor can have enough momentum to resist ever-changing directions. A lot of motors you get running, a lot of stable the system becomes. The limit is also the quantity of power drawn through the third leg of any given motor, the wiring, or your switch, etc.