I just want to calculate the max power requirements of my stepper motors so I can factor that into my power supply choice. It sounds like a simple question (P = V x I), but I've found so many conflicting answers on the web that I'm not sure who to believe any more. Some people use the rated voltage (rather than the actual voltage), some multiply the current by the number of phases (and some don't), and some say the current should be some fraction of the current limit set in the driver (see this article from Geko), can any of the electrical engineers here provide a definitive answer?
Lets take a real world example with this 4 wire stepper 17HS19-2004S1
Rated Current/phase 2.0A
Rated Voltage/phase 2.8V
Recommended Voltage 12-24V
Lets say I'm using a 24V power supply, and I limit current to 1.5A in my stepper driver.
At first sight it would seem simple, the worst case is when both phases are energised, so that's 36W per phase = 72W, is that the figure I should base my power supply choice on?
Lets take a real world example with this 4 wire stepper 17HS19-2004S1
Rated Current/phase 2.0A
Rated Voltage/phase 2.8V
Recommended Voltage 12-24V
Lets say I'm using a 24V power supply, and I limit current to 1.5A in my stepper driver.
At first sight it would seem simple, the worst case is when both phases are energised, so that's 36W per phase = 72W, is that the figure I should base my power supply choice on?