High voltage stepper drivers?

[ZeroCount]

5A is fine for most sensible steppers up to around 12Nm, it's the voltage I want higher, to play it safe with voltage spikes on the mains supply I'd have to drop to 10+% below the max voltage, or invest in a regulated supply. And that would drive the cost up again :(.

I thought on imports the tax was just paying the VAT? (Unless I get it sent marked as a gift :D).

[Gary]

Voltage makes a differnece to top speed performance, but do you need it?
You mention 1.8-3 Nm, so you are within the Nema 23 range, so look for a motor that is as high current as possible, to keep the inductance as low as possible.
There are disadvantages to high voltage as well; the motor will get a lot hotter, and will make a lot more noise.
In my experience for a nema 23 motor 40-50 V is fine, and going up to 70 V will only give you a performance increase at the higher speeds. (Over 300 RPM)
Do you want to pay 50-60% more for 15-20% more performance?
What torque and speed do you need?
Nema 34 motors are different, and these really need high voltage to get the best from them.

[ZeroCount]

Thanks Gary, food for thought there. I agree higher current, lower inductance motors have lower voltage requirements as well.

Slightly confused as to higher voltages causing more noise :confused: why would this be?

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The more I learn about this hobby, the brighter the light of knowledge grows, the deeper is the pit of ignorance revealed...

[Gary]

I am not sure why it makes more noise, will have a look into it and post later.

Thanks Gary, food for thought there. I agree higher current, lower inductance motors have lower voltage requirements as well.

Slightly confused as to higher voltages causing more noise :confused: why would this be?

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The more I learn about this hobby, the brighter the light of knowledge grows, the deeper is the pit of ignorance revealed...