It's not the resistance thats changing, its the reactive components that are changing the impedance. The 120Hz measurement is closer to a static number you would get if you connect a meter to the phases, and set it to ohms. It's simply the resistance of the wire, which should be very low. As the frequency increases, things like capacitive reactance start to take over and skew the impedance measurement.Arlo1 wrote: I dont understand how the resitance is changing so drasticly with the frequency?
If you take the windings out of the motor and lay them out straight, you would basically have a wire with <1Ohm of resistance. However, at frequencies the motors operate at, they can act much differently than a simple static resistor, largely due to how the windings are oriented on the stator.
Look up "frequency vs resistance" for a bit more info. I don't have a ton of experience with this stuff, so I might not be explaining it perfectly.