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Offline fast89

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biggish servo spindle
« on: July 18, 2016, 08:06:04 PM »
I'm doing my research for a 3-3.5kw servo drive and motor that i can use as a lathe spindle (c axis). It has to be single phase input. I would also like 3000-4000rpm out of it. I'm having trouble finding anything that can be run on single phase 200-240v. Anyone have experience in this area?

Offline Hood

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Re: biggish servo spindle
« Reply #1 on: July 19, 2016, 07:34:48 AM »
I think you will struggle finding that, biggest I can recall seeing are about 2Kw.
Hood

Offline Davek0974

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Re: biggish servo spindle
« Reply #2 on: July 19, 2016, 09:18:50 AM »
I found 3.5kW in my recent searching, but you won't get the speed, the bigger motors (>1kw) seem limited to 1500-2000rpm max.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline fast89

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Re: biggish servo spindle
« Reply #3 on: July 19, 2016, 09:30:57 PM »
looks like parker has some single phase drives that take step/dir signals. Now if i could find a motor i might be in business.
Re: biggish servo spindle
« Reply #4 on: July 20, 2016, 04:46:38 AM »
Hi,
I bought a servo off ebay a while back 2.8kw at 3000 rpm. I cant find a drive to run it at least that I can afford.
This servo is quite old, mid 90's, but looks brand new. It is fitted with a resolver and restricts the choices for a drive.
I tried sensorless vector drive but am unimpressed.
I made the decision to build one, very much easier said than done. This hobby, or should I call it an obsession, requires
you learn all sorts of new stuff. If success is determined by what you learn along the way the this project is a boomer!

Looking around both new and secondhand there are plenty of servos to choose from and cheaply if secondhand. Drives
are a different kettle of fish altogether.

Amongst the bigger industrial drives it is quite common to separate the power supply from the inverter. It allows flexibility
to spec the supply to your existing regulations and whether you have your own onsite transformer.

There has been a big upsurge in VFD use in rural NZ for irrigation pumps. Now the power supply authorities are having
to demand farmers fit these units because of the degradation of the supply. They can be nearly as much as a VFD.

There is nothing to prevent you from running single phase but you will need a dedicated 32A or maybe even a 50A supply.
The power company will probably come down on you to fit a conditioning unit otherwise you will degrade your neighbours
supply. Additionally most servos above 2.2kw are rated for 400v line or 560v DC link. If you run such a servo from 230v line
it will not achieve rated speed. A PFC boost in a conditioning unit will overcome the problem but it will SUCK major current
and you going to have some BIG link capacitors.

Search for single to 3 phase converters but be warned they are expensive and you DON'T want junk because they blow
up. I've had several thru work, Chinese stuff and the proud owners are livid!

Craig
My wife left with my best friend...
     and I miss him!

Offline Hood

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Re: biggish servo spindle
« Reply #5 on: July 20, 2016, 07:30:03 AM »
Ok just looked at the specs of the motors I have on my Computurn lathe
Z is H-4075 Allen Bradley and 3000rpm and 9.9Nm cont stall torque so KW is 3.14Kw
X is 4000rpm H-4050 Allen Bradley and 6.8Nm cont stall torque so KW is 2.87Kw

I also have  F-4075 and F4050 motors which are similar specs, 2.95Kw and 2.92Kw

I run them from DSD-030 drives which are single phase.


Hood
« Last Edit: July 20, 2016, 07:36:21 AM by Hood »

Offline Hood

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Re: biggish servo spindle
« Reply #6 on: July 20, 2016, 07:35:32 AM »
Also worth mentioning, you have to make sure you do not get the HV drives as they are 3 phase, so DSD-HV030 is no use for you, it has to be DSD-030.

There are also  DDM drives which were a previous model and you can get a DDM-030 drive. There is also the DDM-075 drive which can be run single or 3 phase 240v but you will have to make sure your supply is good enough.
There is also the DSD-075 drive but I think that is strictly 3phase 230v unlike its older version (the DDM)
Hood
« Last Edit: July 20, 2016, 07:37:43 AM by Hood »

Offline fast89

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Re: biggish servo spindle
« Reply #7 on: July 21, 2016, 12:29:49 PM »
Hood,
Thanks for the info. I found some good prices on a DSD-030 drive and a MPL_A4530K motor. That would get me 2.5kw and 4000rpm. I think this will be enough as Its a small Hardinge HSL lathe. But i hate to under power things. I find myself always pushing the envelope.

Offline Hood

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Re: biggish servo spindle
« Reply #8 on: July 21, 2016, 01:36:12 PM »
I would worry a bit about the MPL-A4530K motor, it is 19amps cont and 62 peak, the 030 drive is just 15/30.
I would  look for an H or F 4050 I would think, the F being probably better for a lathe spindle as it has more inertia.


Hood

Offline fast89

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Re: biggish servo spindle
« Reply #9 on: July 21, 2016, 02:28:21 PM »
I got that motor from allen bradleys specs. It is limited by the 030 drive. If i used the bigger 075 drive it would put out more but those are 3 phase. On another note, do you have a link for the manual for the 030 drive. My quick searching didn't find it yet. I really didn't think i'd have this much trouble finding a single phase drive to go up to 3.5kw.