Making it motor

[KEG]

Howdy Yall :-)

I have done a 2hp 3ph motor conversion, and it is put together, I have a taper lock hub that the machine shop machined and made a flange to mount the blades on, my question is can I hook a say 12 volt battery to the motor and make it motor in order to turn the hub to grind and clean some of the weld off of the face of the hub, it has the 12 leads coming out and how would I hook the up ie: to witch wires.

thank KEG

[Flux]

No.

To motor it you need a 3 phase open loop inverter it is not easy to motor a synchronous motor without hall sensors fitted.

It is absolutely impossible to motor it through a normal rectifier bridge.

Flux

[SparWeb]

Did I read correctly that the hub is welded onto the shaft?

Assuming I didn't understand that correctly, just take the hub off.

The bearings in the motor can't stand up to the loads that grinding could impose.  

[tecker]

Yes you'll need pickup coils or as mentioned hall efect ic. Then you can run mono pole if the cog is not to bad . This is easy with a 2n3055 just need to spinn it up until the pick up coil will drive the 3055 .The 3055 will run hot under 10 ohms at 12 volts but you can double up the transistors .The hallefect needs a sperate dc source around 5 to 15 volts . Running both poles is quite a bit more circuit intensive ,but basicly its a push pull pnp npn set for each phase and input pickups also .An axile fly wheel is my major charging focus but not a topic of discussion here at this time .

[Ungrounded Lightning Rod]

The pickups can be phototransistors working off reflective tape stuck to the rotating part in some convenient place.

Use white safety retro-reflective tape and put a light source very near the phototransistor (with an opaque separator - and ideally a beam-splitter but just putting the source and sensor very close together should work)  and you can do the sensing from a considerable distance.