Detail of Goods: The built-in oscillator realizes fine step-by-step driving the special LSI can select any number of subdivisions in order to protect the subdivision step operation, it can be driven from low speed to high speed (without high-speed counter) 3A / phase high output, high efficiency analog speed control (0 ~ 5V) can be remotely controlled aluminum magnesium alloy shell, anti-interference and good heat dissipation automatic current drop circuit is adopted Power supply voltage: dc18 ~ 40V (absolute maximum rated voltage: 40V) Power supply current: 1.2 times of phase current Motor driving current: 0.3 ~ 3A / phase Driving mode: special unipolar constant current chopper circuit Response frequency: 600kppsmax (when speed input 5V) Automatic current reduction: 0.3 seconds after stopping pulse input, current stop sets the current to 0 ~ 80% during action. Protection circuit: low current and voltage protection, motor misconnection protection and overheating protection Subdivision: subdivide the basic steps 1 ~ 80 and set the possible number of divisions (14 in total) 64, 32, 16, 8, 4, 2, 1, 80, 60, 20, 10, 5, 50 and 25 Overall dimension: 63 (H) 105(W) 56(D)mm Weight: About 250g Built in pulse stepping motor driver