Selecting the right driver

[Gary]

The max voltage is 50V, but over this voltage and the driver will trip into error, so i suggest to use a 40V PSU.

Forget the 3Nm holding torque, it is not the holdiong torque that you need, it is the torque while moving.
Also a stepper driver is a constant current device, so the motor does not pull current, the driver controls the current.

So let’s take the PM542's (PDF), they have a Typical Supply Voltage of 36v with a MAX of 50v.

A late forum member told me I should supply them at the max (50v) is this the correct thing to do? Or would it be better to supply the driver with the Typical Rated Voltage?

I want to get the best speed I can from the motors, will supplying the driver at the MAX voltage mean the motor will also receive a higher voltage and give me better speeds?

If we take the Nema23 3Nm motor (PDF), the document said:

Bipolar Parallel 2.73v, 4.2a, 3Nm

So from that, i take it for the Motor to run at 3Nm Holding Torque it will require from the driver 2.73v and 4.2a ?

The other question i have is about the Motor, when a phase is "in use" is the Volts and Amps it is pulling from the driver divided by the amount of wires coming from the motor?

[Robin Hewitt]

Forget the 3Nm holding torque, it is not the holdiong torque that you need, it is the torque while moving.

I've been saying that for years, it's the torque against speed graph that counts, the one with the voltage next to it :whistling:

OTOH why mess around? I used all sorts of stepper drivers until Gary came up with his 220VAC jobbies and I haven't looked back since. Just make sure your motors can handle the lowest amp setting and fit a griddle to one axis so you can cook breakfast whilst cutting. Oeufs a la swarf. Crunchy