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Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

-wheeling diodes cannot turn-on instantaneously, so the voltage will rise until the diodes start to conduct and give the motor current a path to flow. That's what those spikes are. There are several … -voltage to the power-supply (the spikes not being a problem to the bridge), a fast zener at the input of the bridge may be all you need. A high-frequency capacitor might also do the trick. --- Later …
answered Apr 17 '16 by Mark
Google for "dynamic braking resistor". They are not cheap, but they are available down to just an ohm or two and up to multi-kilowatts. They are basically large heaters, but the nice thing is that you …
answered Jun 30 '16 by Mark
" is not current limited. "Current-limited" is different from "regulated", which typically refers to the output voltage. Also, I will be discussing a brushed DC motor, as no other type of motor really … the motor that will determine if you exceed the power supply's maximum current. 3) Also not necessarily true. Again, the current that the motor draws is determined by torque, and increased voltage
answered Apr 29 '16 by Mark
That 36 volt rating is most likely based on the voltage that will produce the maximum rated speed at no load (in other words, it is equal to the BEMF of the motor at top speed). The insulation … breakdown voltage is typically much higher. You can run at 48 volts as long as 1) you don't exceed the maximum current, and 2) you don't exceed the maximum speed. I regularly run 24 volt motors from a 120 or 160 volt DC bus, using a trans-impedance amplifier to control the current. …
answered Jun 23 '16 by Mark