Don1357
Well-known member
May be a silly question but I'm not familiar with them at all. I would like to use one on an old Delta lathe for the promised variable speed and more even torque across the RPM range.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Are all 3 phase variable speed?
- Thread starter Don1357
- Start date
ssdave
Banned
....
Last edited:
ssdave
Banned
....
Last edited:
I know I would need the inverter and the controller. I figure I would need about a 1 hp motor for an old delta wood lathe.
I may be getting a free 3 phase motor of yet to see hp. I figure it will cost me about a hundred for the inverter. I don't know how much the controller would go for.
I may be getting a free 3 phase motor of yet to see hp. I figure it will cost me about a hundred for the inverter. I don't know how much the controller would go for.
RPH
Well-known member
Yes, any 3 phase motor can work. Question will be is it happy? Too slow and overheating becomes an issue. Too fast and you can have the same problem as the motor isn’t built to take the high frequency required. This is why they make inverter rated motors. So long as you keep your low speed and high speed operation to a minimum you should be ok. You may need to add an additional cooling blower.
laser3kw
Well-known member
I know I would need the inverter and the controller. I figure I would need about a 1 hp motor for an old delta wood lathe.
I may be getting a free 3 phase motor of yet to see hp. I figure it will cost me about a hundred for the inverter. I don't know how much the controller would go for.
The VFD is also the "controller". The control part comes from using the terminal strip as function controls and then setting the VFD parameters for the desired operation.
TheMadMech
Well-known member
Inverter Rated is the way to go if possible.Yes, any 3 phase motor can work. Question will be is it happy? Too slow and overheating becomes an issue. Too fast and you can have the same problem as the motor isn’t built to take the high frequency required. This is why they make inverter rated motors. So long as you keep your low speed and high speed operation to a minimum you should be ok. You may need to add an additional cooling blower.
Sent from my ONEPLUS A6013 using Tapatalk
Packard V8
Well-known member
Yes, no, maybe. For home shop occasional use, a free motor is the way to go.Inverter Rated is the way to go if possible.
jack vines
Spareparts
Well-known member
Variable speed pulley's adjust the belt tension to change the spindle speed, consistent speed and torque, I am assuming a wood lathe being Delta, I might be wrong, but not for the last 15 minutes. Just don't ask my better half
rlitman
Well-known member
...I figure it will cost me about a hundred for the inverter...
VFD price is tied to HP. Go up a step in motor size, and expect a heft increase in cost.
Also, those cheap $100 VFDs are fan cooled, and will **** any dust in the air through them. Used too close to a wood lathe, it's going to die quickly. An enclosed NEMA 4x VFD is probably more like $300 (depending on the HP).
VFD price is tied to HP. Go up a step in motor size, and expect a heft increase in cost.
Also, those cheap $100 VFDs are fan cooled, and will **** any dust in the air through them. Used too close to a wood lathe, it's going to die quickly. An enclosed NEMA 4x VFD is probably more like $300 (depending on the HP).
I haven't seen the motor yet but I think is at/under 1HP.
This is for a hobby use wood lathe, so i'm hopping to put something together to meet both budget and expectations.
rlitman
Well-known member
I haven't seen the motor yet but I think is at/under 1HP.
This is for a hobby use wood lathe, so i'm hopping to put something together to meet both budget and expectations.
Understood. If you have a cabinet, and can put air filters over openings, you might have a good long-term solution. Just be aware that fan cooled VFDs shouldn't be allowed to fill with dust.
theoldwizard1
Well-known member
laser3kw
Well-known member
It won't hurt it to put it into a cabinet with no vents. I doubt that the VFD will heat up enough to make a difference. I design machines that have three 5 hp drives in a 30 x 30 x 12 cabinet. These machines run hour upon hour, day in and day out with no problems.Understood. If you have a cabinet, and can put air filters over openings, you might have a good long-term solution. Just be aware that fan cooled VFDs shouldn't be allowed to fill with dust.
rlitman
Well-known member
It won't hurt it to put it into a cabinet with no vents. I doubt that the VFD will heat up enough to make a difference. I design machines that have three 5 hp drives in a 30 x 30 x 12 cabinet. These machines run hour upon hour, day in and day out with no problems.
Perhaps. Heck, probably. Good drives are designed with enough heat sinks to passively cool. I’m just worried about bargain basement drives.
matt_i
Well-known member
and more even torque across the RPM range.
Just keep in mind this isn't a "constant power device". It can provide constant torque same as the synchronous (60hz) speed but the horsepower will fall off from there.
Recall: (HP = TQ * RPM / 5252) in SAE units...so if the RPM falls off with constant torque then so does the power.
There can be motor cooling issues at reduced speeds as well. I would start to be concerned sub 30Hz if used in a "constant" mode.