labels U, V, and W. Which positive, negative and ground?
U, V, and W =/= positive, negative, and ground. It's not even line, neutral, and ground (which would be more likely in AC - there is no positive and negative in AC). Instead it's more like line, line, and line. They refer to three phases which have a potential voltage difference from phase to phase. You get your power by connecting the load between the phases. It sounds like you cannot run your motor unless you have a 3-phase power source.