My 3-phase, wye wound, 9-lead motor has:

  • wires 1 & 7 connected to wire L1
  • 2 & 8 connected to L2
  • 3 & 9 connected to L3
  • and 4, 5, 6 wired together.

I put a plug on one end of a cable, that is plugged into a 220 V dryer outlet. How are the three wires in the cable, connected to the motor wires?

  • 2
    \$\begingroup\$ A three-phase motor will not work from a single phase household 220 volt outlet. \$\endgroup\$ Apr 12, 2021 at 3:11
  • \$\begingroup\$ Slight modification: A three phase motor will not work SMOOTHLY from a single phase 240 V outlet. It may spin, actually. Especially if you give it a little boost. \$\endgroup\$
    – user57037
    Apr 12, 2021 at 4:22
  • \$\begingroup\$ You have a three-phase motor that can be connected in wye or delta. It cannot be powered by a single-phase power source. \$\endgroup\$ Apr 12, 2021 at 10:03
  • \$\begingroup\$ There exists VFDs which accepts single phase input and output three phase. Probably simpler and cheaper to get a single phase motor though. \$\endgroup\$
    – winny
    Apr 12, 2021 at 13:03

1 Answer 1


It's not optimal but there is a way to run small 3-phase induction motors at reduced torque from a single phase supply.

It's called "Steinmetz connection" (Steinmetz being one of the developers of said motors). In short you can use a capacitor to create a 'fake' phase from the supply line. Search the web for formulas and details.


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