Hi Carl, nice theory and real world demonstration. I think nearly all USA homes have 2 phases, or 2 hot wires, so 120 and 240 volts, it took me ages to work out why copying there schematics didn't work 🤔. Thanks for sharing
Thanks for the mig-welding link... I had a very enjoyable read, and the pictures are an excellent reference. I am going to contact Mill Hill Supplies, and see if they have a spare x axis worm nut. As much as i'd like to make my own, I don't think i'm skilled enough to turn the internal thread. Thanks again Carl !
No problem. Check out my other films and stay tuned for more info. I think I would cut the thread in that nut with a tap. That's what I'm going to do with the table cross slide nut as it is worn.
Great work Carl, very informative, we had a talk at the Culbin Model Club on this subject without the theory, so it is great to see why the motor on that occasion worked. I will direct the members to this video
Hi Carl great video as usual. This theory behind the practice has increased my knowledge. I have a 1960s bridgeport and managed to get a 240 to 415 VFD. Would love to have found the star point and reconfigured to delta. The suds pump was no theory. I just tried capacitors until one worked. Although I don't use the suds that much.
Hi Rob. I'm glad you found it useful. Those vfds 240-415 are useful things. Well done for getting it set up. Good on you for using the capacitor method on the suds pump. Thanks very much for your support! It's much appreciated.
Hello Carl. Excellent video, well done. We can improve matters by adding balance and cos/phi compensation capacitors over the other two delta windings; however, I've never done this by calculation, only by adding and removing capacitors until I got a good result. The main problem with doing it experimentally is that it's hard to get a decent load and measure everything all at the same time, especially when it comes to lathe / milling machine or a "rotary converter" setup. Any idea on theory for the later optimisation steps?
Thank you so much for your comment and interest! Yes I believe in calculation and trusting the theory, even if it means using it to get us in range, thereby narrowing the field for trial and error methods. I like your suggestions regarding compensation capacitors and yes I could make a follow up video on this subject including that. Thank you again for your support, it means a great deal to me. Please consider subscribing if you haven't already. And please do check out my other videos. Thank you again.
Hi Wilson Still confused about load current max. Suppose if I have 5.5kw 380v 11A delta connection, according to the equation in video shall I multiply by 1.73 again if yes on what theory you stand for? If no I can apply with clear understanding
Hello my friend and thank you for commenting. If you have a motor that is connected in delta and the load current stated is for the delta connection, then you do not need to multiply by 1.73. However, if you have a motor that was connected in star and you have modified it to delta, and you only have a load current figure for the star connection, then you must multiply this star current figure by 1.73 to get the load current for the delta connection. I hope this helps. Thank you very much for your comments and interest. Please get in touch again if you need more help or clarification.
Hi Carl, I have searched through your videos, but can't find the one showing the feed gearbox rebuild. Would you mind posting a link to the video here? Mine needs a new leadscrew nut, as backlash is excessive. Thanks, Richard.
Hi, Richard. I rebuilt the feed box pre having a channel here. I documented the refurb on the mig welding forum. I will send a link in due course. Meantime here is a link to me showing the box. th-cam.com/video/IptneF4dWzA/w-d-xo.htmlsi=aryec5PC3yrQEr1J Making a new lead nut will be an interesting project.
Richard here is the link to my thread on the mill at the mig welding forum. In here you will find the gearbox rebuild. www.mig-welding.co.uk/forum/threads/harrison-horizontal-vertical-mill-restoration.82648/
I have a little bit of confusion with the formulas. Im in Canada and am working with a 220v 3 phase .4 amp coolant pump motor for a milling machine. I see in your formula it is 2x3.14x60x120 for north America. But wouldnt that be 220v for the power on the last figure over 120v? If im doing the calculation correctly i would need an 8.8uf capacitor on your formula or 4.8uf capacitor if using 220v in the same calculation in place of 120v. I installed a 10uf 250v capacitor and it worked but it was getting hot on the bench after a few minutes. Voltage was also very high on one leg..
@carlwilson1772 this motor only has 3 wires coming out of the motor body with no external way of changing its coil arrangement. I am just taking a risk with it being low voltage and only 3 wire that it would be delta. I've had this motor completely apart and the coils are a solid brick of potting epoxy and I can't make out what the coil arrangement would be for sure.
@carlwilson1772 I did however purchase a 8uf 450v capacitor yesterday and tested with that setup. It gave me quite a bit more rpm. And the motor can sit on the bench for 10 minutes running without getting concernably warm. Voltage over the coils also regulated a bit better with an 8uf measuring 330v, 280v and 240v. I'm still thinking about dropping to a 6uf and see what that will do. What are your thoughts?
Hello everyone. In this video we look at the Steinmetz connection. This is the simplest way to run a three phase motor from a single phase supply, using a capacitor to create a phase shift. I show a simple method to calculate the value of the capacitor, based on electrical principles. The emphasis throughout is on practical methods backed up by theory. I hope you all enjoy it.
Hi Carl, excellent video, this will run and run!! took me back to my Tech college days at Beverley in 1970 on! Did ONC electrical engineering. You got a really good result there , good balance, and even currents! Charles Proteus Steinmetz was a very interesting guy, there is a lot of biographical stuff on the net, its a good read! Phil
@@philhermetic Thank you Phil. My aim here was to kill once and for all the speculation and in some cases utter nonsense that is written about the Steinmetz connection. I hope it proves useful to many others. Steinmetz was a really interesting man as you say. A solid unsung hero of engineering. Really glad you enjoyed it and great to see you here.
i followed your example, but i don't understand why you said to convert from star to delta connection to use 240V voltage, but didn't see you change the connection. Besides, why delta connection amp only uses 50% (0.536 x 0.5 = 0.27). Can we use full amp 0.536 to choose capacitor. thanks!@@carlwilson1772
Looks like a perfectly made report of an electrical student at some university. 😊It was very, very (!) understandable!
Thank you ❤
@@olgaourgent8944 No problem at all. I'm pleased you found it useful. Please like and subscribe to my channel.
@@carlwilson1772 trust me, i did 😉
Hi Carl, nice theory and real world demonstration.
I think nearly all USA homes have 2 phases, or 2 hot wires, so 120 and 240 volts, it took me ages to work out why copying there schematics didn't work 🤔.
Thanks for sharing
Thanks, brilliant comment and observation. Thank you for your support!
Good to see you back in the workshop. I did the same thing to run the suds pump on my harrison lathe.
All the best
Jack
Great to see you Jack, glad you enjoyed the film!
Thanks for the mig-welding link... I had a very enjoyable read, and the pictures are an excellent reference. I am going to contact Mill Hill Supplies, and see if they have a spare x axis worm nut. As much as i'd like to make my own, I don't think i'm skilled enough to turn the internal thread. Thanks again Carl !
No problem. Check out my other films and stay tuned for more info. I think I would cut the thread in that nut with a tap. That's what I'm going to do with the table cross slide nut as it is worn.
Nice one Carl
Thanks very much, glad you enjoyed it.
Great work Carl, very informative, we had a talk at the Culbin Model Club on this subject without the theory, so it is great to see why the motor on that occasion worked. I will direct the members to this video
Thanks Richard. I really appreciate your support. It would be great if the Culbin modellers and the T exchange guys could all subscribe!
Good job brother. Explained it good.
Thanks Cain. Glad you liked it.
Just watched this again Carl, useful. Needed to calc a capacitor for a motor on a machine. Cheers
Hello Paul. I am glad you found it useful. The film has served it's purpose!
Hi Carl great video as usual. This theory behind the practice has increased my knowledge. I have a 1960s bridgeport and managed to get a 240 to 415 VFD. Would love to have found the star point and reconfigured to delta. The suds pump was no theory. I just tried capacitors until one worked. Although I don't use the suds that much.
Hi Rob. I'm glad you found it useful. Those vfds 240-415 are useful things. Well done for getting it set up. Good on you for using the capacitor method on the suds pump. Thanks very much for your support! It's much appreciated.
That was really well explained, excellent video.
Best wishes, Dean.
Thanks for the nice words and support! Glad you enjoyed it.
Well explained Carl, even I understood it 🤣🤣🤣
Thanks John I am glad you enjoyed it.
Hello Carl. Excellent video, well done. We can improve matters by adding balance and cos/phi compensation capacitors over the other two delta windings; however, I've never done this by calculation, only by adding and removing capacitors until I got a good result. The main problem with doing it experimentally is that it's hard to get a decent load and measure everything all at the same time, especially when it comes to lathe / milling machine or a "rotary converter" setup. Any idea on theory for the later optimisation steps?
Thank you so much for your comment and interest! Yes I believe in calculation and trusting the theory, even if it means using it to get us in range, thereby narrowing the field for trial and error methods. I like your suggestions regarding compensation capacitors and yes I could make a follow up video on this subject including that. Thank you again for your support, it means a great deal to me. Please consider subscribing if you haven't already. And please do check out my other videos. Thank you again.
Hi Wilson
Still confused about load current max. Suppose if I have 5.5kw 380v 11A delta connection, according to the equation in video shall I multiply by 1.73 again if yes on what theory you stand for? If no I can apply with clear understanding
Hello my friend and thank you for commenting. If you have a motor that is connected in delta and the load current stated is for the delta connection, then you do not need to multiply by 1.73. However, if you have a motor that was connected in star and you have modified it to delta, and you only have a load current figure for the star connection, then you must multiply this star current figure by 1.73 to get the load current for the delta connection. I hope this helps. Thank you very much for your comments and interest. Please get in touch again if you need more help or clarification.
Hi Carl, I have searched through your videos, but can't find the one showing the feed gearbox rebuild. Would you mind posting a link to the video here? Mine needs a new leadscrew nut, as backlash is excessive. Thanks, Richard.
Hi, Richard. I rebuilt the feed box pre having a channel here. I documented the refurb on the mig welding forum. I will send a link in due course. Meantime here is a link to me showing the box. th-cam.com/video/IptneF4dWzA/w-d-xo.htmlsi=aryec5PC3yrQEr1J
Making a new lead nut will be an interesting project.
Richard here is the link to my thread on the mill at the mig welding forum. In here you will find the gearbox rebuild.
www.mig-welding.co.uk/forum/threads/harrison-horizontal-vertical-mill-restoration.82648/
I have a little bit of confusion with the formulas. Im in Canada and am working with a 220v 3 phase .4 amp coolant pump motor for a milling machine. I see in your formula it is 2x3.14x60x120 for north America. But wouldnt that be 220v for the power on the last figure over 120v? If im doing the calculation correctly i would need an 8.8uf capacitor on your formula or 4.8uf capacitor if using 220v in the same calculation in place of 120v. I installed a 10uf 250v capacitor and it worked but it was getting hot on the bench after a few minutes. Voltage was also very high on one leg..
Hi Dan great to get your comment. Is your motor 220V 0.4A when connected in delta?
@carlwilson1772 this motor only has 3 wires coming out of the motor body with no external way of changing its coil arrangement. I am just taking a risk with it being low voltage and only 3 wire that it would be delta. I've had this motor completely apart and the coils are a solid brick of potting epoxy and I can't make out what the coil arrangement would be for sure.
@carlwilson1772 I did however purchase a 8uf 450v capacitor yesterday and tested with that setup. It gave me quite a bit more rpm. And the motor can sit on the bench for 10 minutes running without getting concernably warm. Voltage over the coils also regulated a bit better with an 8uf measuring 330v, 280v and 240v. I'm still thinking about dropping to a 6uf and see what that will do. What are your thoughts?
eyup Carl, thanks for sharing👍👍👍👍, and explaining in simple terms for people like me an electrical numbskull🤣🤣
see you next time
Kev
You are more than welcome. I'm glad you enjoyed it.
Hello everyone. In this video we look at the Steinmetz connection. This is the simplest way to run a three phase motor from a single phase supply, using a capacitor to create a phase shift. I show a simple method to calculate the value of the capacitor, based on electrical principles. The emphasis throughout is on practical methods backed up by theory. I hope you all enjoy it.
Hi Carl, excellent video, this will run and run!! took me back to my Tech college days at Beverley in 1970 on! Did ONC electrical engineering. You got a really good result there , good balance, and even currents! Charles Proteus Steinmetz was a very interesting guy, there is a lot of biographical stuff on the net, its a good read!
Phil
@@philhermetic Thank you Phil. My aim here was to kill once and for all the speculation and in some cases utter nonsense that is written about the Steinmetz connection. I hope it proves useful to many others. Steinmetz was a really interesting man as you say. A solid unsung hero of engineering. Really glad you enjoyed it and great to see you here.
@@carlwilson1772 i am sure it will, you explained the maths so well even i understood it!
@@philhermetic One does ones' best.
Hi sir, if I use capacitor 8uf for full load, can it work? Thanks!
And this motor need to change delta connection, right?
Hello friend, if you let me know the power rating and voltage of your motor, I can help you.
i followed your example, but i don't understand why you said to convert from star to delta connection to use 240V voltage, but didn't see you change the connection. Besides, why delta connection amp only uses 50% (0.536 x 0.5 = 0.27). Can we use full amp 0.536 to choose capacitor. thanks!@@carlwilson1772
Here
Glad to see you friend.