I sold a guy a phase converter. He is asking me if my converter is wye or delta because he has a choice of wiring his lathe in wye or delta on low voltage. The idler winding are wye however I read on the forum it is an considered an open delta source. ??
I can’t seem to post a picture of the wiring diagram. What is the advantages of either wiring configuration. Just wondering how to respond to him. Thanks guys.
Every three phase standard motor I have ever seen takes in power on three wires. There may be anything inside the motor, but that does not matter.
Three wires is all it takes to supply 3 phase power. And 3 wires is possible with EITHER a "delta" source, OR a "wye" source.
Motors can be wired internally with the various coils connected in wye or in delta. However, those correspond to two DIFFERENT voltages. A 230V motor connected internally as "delta", will have three coils each taking the line-to-line voltage of 230V. (It will have three input wires for the power.) If reconnected as "wye", it will be ready for use at 400V line-to-line.
NO regular 3 phase motor I am aware of uses the neutral for any purpose at all. If the motor is connected internally as "wye", there will be a "neutral point" internal to the motor, but that point is never connected externally to the power source. Only three wires are used for power regardless of the internal connections. Consequently, the internal wiring of the motor is ONLY important as it applies to getting the wiring correct for the voltage it needs to work on. The type of source, so long as it is three phase of the correct voltage, does not affect the motor, which only uses 3 wires, Whether the source is wye, delta, corner grounded, wild leg 3 phase, or whatever.
If the source happens to be a rotary phase converter, the output of it will be "wild leg 3 phase", also known as "high leg 3 phase", "farm 3 phase", "lighting tap 3 phase", "stinger 3 phase" and other names.
But that is not relevant to the internal wiring of the motor, so long as the motor is set up for the voltage that is being supplied.