Thor, or should that be Zeus?

[battwell]

Nice machine
I have hsd 919 on my machine. I run from single phase using a dual stage vfd. 220 in 380 out.
Stops in3 second no problem

[Chaz]

Nice machine
I have hsd 919 on my machine. I run from single phase using a dual stage vfd. 220 in 380 out.
Stops in3 second no problem

Thanks

Please tell me more about this VFD? Make and model please. Does it output 380v?

[battwell]

My machine has been running about 2 years using huanyang gt series. Il have to find exact model number. The only downside- no braking resistor relay as standard- its special order- but only £5. Also must be modified to run modbus ( I've done this)

I have what seems to be better made "copy" of the same unit here on test too. Has braking interface and is modbus compatible from the factory- even though they don't supply modbus instructions- took me a week to work out how to talk to it. ( I can share the info)
220 single in 380 out.
On my machine running had 919 spindle I rarely see more than 5 amp current draw from the main supply.,
Ecogoo 9100-00750-G-B
While they have a max current draw of 34 amp mine is still working as I originally wired it for test from a 13a plug.

Ecogoo can be found on aliexpress. Delivery was free and only took a few days to arrive. Just checked price at ££251 today
That's the one I'd recommend

[battwell]

Here's a video of mine running. On hy vfd.
I set the vfd to show current
https://youtu.be/C_xe_VP0_ps

[m_c]

I know voltage increasing VFDs do exist, but I can't see anything on either the Huanyang or Ecogoo sites/manuals about those VFDs being able to boost voltages.

You can run 380V three phase motors from single phase using 230V single phase, however once you reach a certain frequency (roughly 2/3 of max rated frequency IIRC), the power available becomes voltage limited. Above that speed you can't get full power, as the voltage isn't high enough to overcome the back emf and drive the required current through the windings, so the available torque drops of as speed increases.
Inverters Direct (aka Drives Direct) supply 230 to 380V VFDs. I did look into them and they are a commercial make (I did have the make/model, but can't find it) with lots of Drives Direct stickers on them. The non-rebadged inverters are available cheaper, but I suspect Drives Direct are doing some internal modifications to boost the input voltage.

The easiest way to achieve it, would be a 250 to 380V step up transformer, big bridge rectifier, and bank of suitable capacitors, and feed the resulting 540VDC direct into the inverters DC bus. That way you bypass the VFDs own rectifier circuits (you could feed the 380V single phase directly in, however you risk overloading the VFDs internal rectifier circuit, and overheating the internal smoothing capacitors due to the increased ripple from only having a single phase supply).
The other option, which is what I suspect Drives Direct are doing, is using a suitable oscillator circuit and inductors to do the boosting, as it would result in a far more compact system.

I'd like to get my hands on a Drives Direct VFD to see just exactly what they are doing, but I'm not willing to pay their prices, and I don't think anybody who has bought one, would be willing to let me dismantle it to have a look.

[Chaz]

I know voltage increasing VFDs do exist, but I can't see anything on either the Huanyang or Ecogoo sites/manuals about those VFDs being able to boost voltages.

You can run 380V three phase motors from single phase using 230V single phase, however once you reach a certain frequency (roughly 2/3 of max rated frequency IIRC), the power available becomes voltage limited. Above that speed you can't get full power, as the voltage isn't high enough to overcome the back emf and drive the required current through the windings, so the available torque drops of as speed increases.
Inverters Direct (aka Drives Direct) supply 230 to 380V VFDs. I did look into them and they are a commercial make (I did have the make/model, but can't find it) with lots of Drives Direct stickers on them. The non-rebadged inverters are available cheaper, but I suspect Drives Direct are doing some internal modifications to boost the input voltage.

The easiest way to achieve it, would be a 250 to 380V step up transformer, big bridge rectifier, and bank of suitable capacitors, and feed the resulting 540VDC direct into the inverters DC bus. That way you bypass the VFDs own rectifier circuits (you could feed the 380V single phase directly in, however you risk overloading the VFDs internal rectifier circuit, and overheating the internal smoothing capacitors due to the increased ripple from only having a single phase supply).
The other option, which is what I suspect Drives Direct are doing, is using a suitable oscillator circuit and inductors to do the boosting, as it would result in a far more compact system.

I'd like to get my hands on a Drives Direct VFD to see just exactly what they are doing, but I'm not willing to pay their prices, and I don't think anybody who has bought one, would be willing to let me dismantle it to have a look.

Thanks both. I did speak to them, for my application they want £4K for one that can deal with a VFD hanging on it. I didnt buy ...

[battwell]

I know voltage increasing VFDs do exist, but I can't see anything on either the Huanyang or Ecogoo sites/manuals about those VFDs being able to boost voltages.

You can run 380V three phase motors from single phase using 230V single phase, however once you reach a certain frequency (roughly 2/3 of max rated frequency IIRC), the power available becomes voltage limited. Above that speed you can't get full power, as the voltage isn't high enough to overcome the back emf and drive the required current through the windings, so the available torque drops of as speed increases.
Inverters Direct (aka Drives Direct) supply 230 to 380V VFDs. I did look into them and they are a commercial make (I did have the make/model, but can't find it) with lots of Drives Direct stickers on them. The non-rebadged inverters are available cheaper, but I suspect Drives Direct are doing some internal modifications to boost the input voltage.

The easiest way to achieve it, would be a 250 to 380V step up transformer, big bridge rectifier, and bank of suitable capacitors, and feed the resulting 540VDC direct into the inverters DC bus. That way you bypass the VFDs own rectifier circuits (you could feed the 380V single phase directly in, however you risk overloading the VFDs internal rectifier circuit, and overheating the internal smoothing capacitors due to the increased ripple from only having a single phase supply).
The other option, which is what I suspect Drives Direct are doing, is using a suitable oscillator circuit and inductors to do the boosting, as it would result in a far more compact system.

I'd like to get my hands on a Drives Direct VFD to see just exactly what they are doing, but I'm not willing to pay their prices, and I don't think anybody who has bought one, would be willing to let me dismantle it to have a look.

No need- its all done in the dual stage vfds i have! perfect 380v. under £400 so why mess about. i have them running hsd spindles and a big hydrovane in my workshop for over 2 years now. i test all spindles i sell using the newer ecogoo 9100 :-)
its the only one that can output to the frequencies i require - standard up to 650 hz and special order to 800hz

[m_c]

No need- its all done in the dual stage vfds i have! perfect 380v. under £400 so why mess about. i have them running hsd spindles and a big hydrovane in my workshop for over 2 years now. i test all spindles i sell using the newer ecogoo 9100 :-)
its the only one that can output to the frequencies i require - standard up to 650 hz and special order to 800hz

Finally found a link to the inverters on Aliexpress (https://www.aliexpress.com/item/VFD-...836555598.html)
And the full range can be found on ecogoo website at http://www.ecogoo.com.cn/product-category/220-380
There seems to a bit inconsistency with their model numbers though, but if you get the model number for the size of inverter you'd like on the ecogoo site, searching for it on aliexpress narrows the results.

Some do seem to need derated though. The 7.5KW mentions on the aliexpress listing that it's only suitable for up to 5.5KW motors.

I might get one to try on my big mill, as that's next on the retro list.