On 29.03.2015 21:50, Cecil Thomas wrote: > It might be too obvious to point out but I would feel the need to ask > about the current output capability of the 24 and 36 volt supplies or > batteries. > > A 36 volt supply that can't output the motor's rated current is not > going to turn the motor as well as a 12 volt supply with ample > current capacity. > > That question should be answered before the supply was even considered.
Please remember that the driver acts as a buck converter, therefore converting a high input voltage with low current into a low output (motor) voltage with higher current. It is not necessary to have a supply that can constantly supply the full rated current of the motor, otherwise the OP would have a linear driver generating A LOT of heat. What should be considered, however, is the peak current that the supply has to source. This indeed equals the motor's current rating (or even more, depends on the current limit setting of the driver), but has only to be supplied for microseconds. Insufficient capacitance on the supply lines and/or very long (high-inductance) cabling might cause the mentioned effects if the driver's turn-on causes a voltage dip in the supply, thereby triggering the undervoltage lockout or brownout circuit. A scope would show such effects, but it might also be worth a try to just add some capacitors (say 10uF and 1000uF or so, both 50V or higher) directly to the supply terminals of the driver for a test. Cheers, Philipp
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