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General Mach Discussion / Re: Power Supply Unit
« on: January 08, 2011, 05:36:08 PM »
"Do you see any problem with the power unit I purchased?" - Yes. What you really want is about a 37V/10A supply. 12V is nowhere near enough to get decent performance from those motors. The ideal voltage for the motors is given by 32 times the square root of the motor inductance (in mH), which gives about 47.5V. This is assuming bipolar parallel mode, which is what you want to use. But your drivers are rated for 42V maximum, so you want to stay a bit below that maximum rating, so knock it down to 37V. The current rating of the supply should be about 70% of the sum of all the motor currents, or about 8.5A. Round that up to 10A. You won't get best performance out of this setup, as the drivers are not well matched to the motors. You will be losing about 25% of the potential torque, since your drivers won't allow you to run full rated current on the motors (4.2A for the motors, vs 3A for the drivers).
Regards,
Ray L.
Regards,
Ray L.