1st trial current limiter: including a big wattage collection light bulb or better nonetheless an electric kettle detail in collection with the motor in the phase lead makes it more difficult to blow things up. Adding a sequence kettle element is optionally available however substantially reduces the cutting-edge than can float in case you do something "inadvisable" [tm]. There are (you are saying) 4 purple wires. Those are possibly 2 for run winding and 2 for start winding. The begin winding is in collection with the capacitor (massive white cylinder). Run winding should join across mains directly. Start winding have to be in collection with capacitor. There is a totally small danger that some other connection has been made by using i would not expect that to work at all besides if there has been a wiring error within the wire - that's possible however less in all likelihood.