three phase coolant pump

[powderblast]

Yes you would have to strip it down to find the star point, it would have been made with 3 sets of windings so there will be a star point, it could be there as soon as you take the top off. Just depends how able you are, you could then reconfigure internally and bring out the 3 leads as it is just now.

It seems to be pumping sufficiently anyway, you'll never need that kind of flow for coolent on the lathe, it'll empty before it's drained back. You'll use it once and it'll be everywhere, I hardly use my collect pump, only if it's stainless steel I'm turning.

its was they surging it was doing im concerned about the flow is ample i think you will have to turn it down

 

[westward10]

Can't you wire a supply from the lathe.

 

[westward10]

Why do you think it is star and not delta connected.

 

[Rocboni]

Never considered it to have 400v windings connected in delta, wouldn't that be unusual for such a small motor?

 

[westward10]

Don't know to be honest.

 

[Rocboni]

I would bet on it being star connected, larger motors above 5kw delta 400v star 690v from my limited experience.

 

[powderblast]

I have left it running for around 30mins and the temperature of the motor got to around 40degree no hotter so i think ill just leave it alone it never stopped, did slow down but i think it will work fine as is.

 

[westward10]

Seems to be fine, have you tried it with no fluid running through it. Not for too long, might need it to lubricate the pump.

 

[Marvo]

There's so many factors at play here that finding the best cap size is going to be hit and miss, I'd try a 3.5uF and see if it's any better.

Might be a good idea to fit a klixon type device rated at maybe 80 Celsius, there's a good chance that motor's going to run armer than its winding class permits if it's running for extended periods.

KSD301 N/C 80 degree 15A Thermostat Temperature Switch Bimetal Disc - KLIXON | eBay - http://www.ebay.co.uk/itm/KSD301-N-C-80-degree-15A-Thermostat-Temperature-Switch-Bimetal-Disc-KLIXON-/141682953211

 

[marconi]

Here is a link to a static phase converter which someone in a welding forum has used to run a 0.05hp (0.05 x 750 = 37.5 W) three phase motor coolant motor like yours. It switches in a boost capacitor for the starting phase using in this case a push button but an arrangement using a time delayed relay and its contacts could make it automatic.

rotary phase converter wiring schematic - Google Search - https://www.google.co.uk/search?q=rotary+phase+converter+wiring+schematic&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiIt-fX0e3WAhXCuRoKHZdaCqUQsAQIJQ&biw=1640&bih=766#imgrc=qM-k0hCKK2k2_M:

Static phase converters are not good at starting and powering variable and high torque loads. In your case I think there is some hunting or hysteresis happening caused by the interaction of the motor's torque speed characteristics and that of the pump and fluid's. Ie: Motor speeds ups - load torque increases - motor torque decreases - motor slows down - load torque decreases until point when motor torque begins to increase....and as the pump motor changes in speed so does the magnitude of the generated phantom phase.

A way around this is to use a rotary phase converter. These use an unloaded 'idler' motor of say 4-5 times the power of the load motor to generate the phantom third phase in its windings. The load motor is then connected across the idler motor's windings viz L1 -L1, L2-L2 and Lp -Lp to be energised by the two supply lines L1 and L2 and the phantom phase Lp generated by the idler. This scheme allows the load motor to be powered by the idler and its inertia (mechanical and electrical) ie. the load motor to be motoring rather than be both generating and motoring at one and the same time. Or something along these lines.

There are many 'how to' guides at the end of a google search. You need to be, or employ someone who is, competent in electrical matters, craft and safety to build one or perhaps buy one or have one made for you.

ABB 3 phase motor. 0.18 kW 1370 RPM | eBay - http://www.ebay.co.uk/itm/ABB-3-phase-motor-0-18-kW-1370-RPM-/263243880545

 

[Rocboni]

It would be a lot less hassle just to buy a single phase coolant pump. £100 on ebay

 

[marconi]

Something like this then - a peristaltic pump:

Peristaltic Pump 230v Dishwasher Detergent Dosing 3l/hr Giados D3.fix | eBay - https://www.ebay.co.uk/p/Peristaltic-Pump-230v-Dishwasher-Detergent-Dosing-3l-hr-Giados-D3-fix/1667197183?iid=162390951590

For £50 inc P&P

 

[Rocboni]

3L per our is pretty poor, you can get proper pump that would fit the tank

Vertex Coolant Pump 240 volt 1/8hp 150mm Stem | eBay - http://www.ebay.co.uk/itm/Vertex-Coolant-Pump-240-volt-1-8hp-150mm-Stem-/282671672898

I actually use a pond fountain pump

 

[marconi]

3L per our is pretty poor, you can get proper pump that would fit the tank

Vertex Coolant Pump 240 volt 1/8hp 150mm Stem | eBay - http://www.ebay.co.uk/itm/Vertex-Coolant-Pump-240-volt-1-8hp-150mm-Stem-/282671672898

I actually use a pond fountain pump

I think this fella, Rocboni, will and should go far in his chosen career. I am bowing out to you on this problem!

 

[Rocboni]

I think this fella, Rocboni, will and should go far in his chosen career. I am bowing out to you on this problem!

I sure hope so!