Originally Posted by Mini Miller Hey Viper and Randy, as I understand, you want a power supply that is 20 - 25 times the voltage of your motor which would be upwards of 60 volts. I happen to have found a very nice unregulated, toroidial power supply that is rated at 42 volts, 10 amps. Sounds perfect to me. Am I missing something?
For the current, you need to figure out how you are going to wire a motor, and add up all 3 of them. If I wire these in parallel (half-winding) mode, i'll be drawing all 4 amps that the motors are rated for. Take 67% of that number, add up all 3 motors, and I get about 8 amps. If I am figuring something wrong, please let me know.
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The 20-25x "rule" is something mentioned in the Gecko white papers, I believe. There has been some discussion of it's validity on some other groups. The higher the voltage, the higher the top speed you can attain. Also, the hotter your motors will get. Ideally, you want to use the lowest voltage to get the speed that you need. This will keep your motors the coolest. It won't hurt anything to run them @ 42V and see how they are working. Monitor the temp of the motors, make sure they stay under 100° C. I'd guess they will. If they get hotter , use less Voltage.
The 8a figure is correct for Gecko drives. Other drives may need more. It looks like you have a perfect power supply for those motors.