gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
130427-2338 EDT
A wye motor fed with 4 wires, meaning the mid-point of the wye is connected, operates as a 2 phase motor if one hot supply line is opened. This has a rotating magnetic field.
If the center point is just floating, then there is only single phase excitation and no rotating magnetic field, just a unidirectional field changing max + to 0 to maximum - to 0 and back to +. No rotation without a mechanical push.
A delta connected motor where one phase line is lost has only single phase excitation. In this case to one coil with two series connected coils in parallel with said one coil. Still only a unidirectional oscillating magnetic field.
.
A wye motor fed with 4 wires, meaning the mid-point of the wye is connected, operates as a 2 phase motor if one hot supply line is opened. This has a rotating magnetic field.
If the center point is just floating, then there is only single phase excitation and no rotating magnetic field, just a unidirectional field changing max + to 0 to maximum - to 0 and back to +. No rotation without a mechanical push.
A delta connected motor where one phase line is lost has only single phase excitation. In this case to one coil with two series connected coils in parallel with said one coil. Still only a unidirectional oscillating magnetic field.
.