As major pointed out, as a synchronous AC motor it has a three-phase (and so three-wire) connection from motor to inverter/controller. Since NetGain has not previously offered AC motors, their existing controllers are only DC; the motor announcement says that it is being offered as a package with a suitable controller.
EV West says it is an
AC-X1 by SME Group (which SME gets from a Chinese manufacturer). This leads to them calling it an "integrated system", but the inverter isn't mounted on the motor - it's just that the controller/inverter is chosen to be suitable for the motor, and they're sold together.
In the
image of the motor in the announcement, only two input terminals are clearly visible. That's just an unfortunate camera angle, almost hiding the third terminal on one end behind a cable.
NetGain motor performance data seems nearly useless to me, based on a bizarre and simplistic test method which appears to result from a lack of proper test equipment. I don't think there's any point in comparing data published by NetGain for the WarP 9 to the data for the HyPer 9.