RE : Re: RE : Re: [multimachine] Speed control - variateur de vitesse
- It is right what I'm looking for. I will design a gear box with the reduction needed for my purposes, i.e. fuul, half and one third of the full speed. But I have to change the motor for a 5hp 230Vac 1ph.Thank you to every body for their comments!Larry
keith gutshall <drpshops@...> a écrit :Hello LarryI am like Jeff, the best way to get a reduction in speed from a single phase motor would be a reduction shaft with pulleys or gears.The motor would run at full speed and be most efficient. The belts and/ or gears would use some power but not enought to worrie about.Keith Gutshall
Jeff <jhan5en@yahoo. com> wrote:Larry
If you could alter the gear ratio either via the pulleys or a
planetary gear set below the motor you could run the motor at full
rpm and use a cheap phase converter to power the mill and anything
else in the shop. I have seen people use a planetary form an automatic
transmission to gear down electric motors with good success.
I thought that I put this reference in the links but here is a good
reference on three phase converters to expand on what Darwin Said.
http://www.metalweb news.com/ howto/ph- conv/ph-conv. html
--- In multimachine@ yahoogroups. com, lorier dal <lorierda@.. .> wrote:
> Yes it is a 5hp. I need to cut 1/2 the speed for the slowest speed
i.e. 1750 / 2 = 875 rpm. Have to run 8" facemill with 16 inserts.
There is no clutch. The max amp is 21.
> Pat Delany <rigmatch@.. .> a écrit :
> I suggest a 5 hp 3 phase motor made specifically for a
> VFD (big fan blades, 10 to 1 speed ratio) with a
> single phase input and 3 phase output. My son has a
> 15" Colchester lathe with a 7.5 hp 3 phase motor that
> he runs on a 3 hp single phase 240v circuit. It works
> great if he is careful bringing it up to speed.
> I think we need more information.
> Is it really a 5hp load?
> How slow do you want it to run?
> What kind of load does it have to start?
> Does it have a clutch?
> How much current does the existing motor draw under
> full load?
> > Larry, je ne parle pas Francais.
> > What speed range do you need? A VFD will easily do
> > 2:1 or more, but
> > hold on to your wallet.
> > Synchronous motors are not easy to speed control.
> > >I must buy an electric motor of 5hp, 240Vac, 21amp,
> > 1 phase and I need
> > >to be able to control his RPM. I try to find a
> > variator but without
> > >success. Somebody know where can find a variable
> > speed control for this
> > >type of motor???
> > >
> > >Thank you!
> > >
> > >Larry
> > David G. LeVine
> > Nashua, NH 03060
> > --
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- At 02:46 PM 4/4/2007, you wrote:
>If a manual transmision can take the torque of a 5hp motor it willI'm going to be a little silly here. An old Muncie can easily handle
>be a good idea... not bad and interesting. I'll look about that,
>maybe I will start-up my milling earlier than expected with this.
500 ft-lbs of torque at 6,500 RPM. Can your 5 HP motor do more than
that? Look at what your motor can put out for torque, then look at
an automobile engine. I think it is overkill to use a high powered
car transmission. Anything bigger that a "2 horse" should be
fine. Some garden tractors are big enough. Find a 12 HP with a
hydrostatic transmission and it will give you infinite speeds.
David G. LeVine
Nashua, NH 03060
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