The stepper motor driver bus voltage is a tool that can be used to adjust system performance. By increasing the bus voltage, the drive continues to run, and the speed and torque of the motor as well as the power output will increase. Because of these advantages, the stepper motor uses a bipolar chopper driver whose voltage is many times the nameplate voltage. Generally, the motion control system uses 24 [V], 48 [V] or even 80 [V] higher voltage. A good rule of thumb is to use 10 to 24 times the motor nameplate voltage as the system bus voltage.Ourstepper driver,even in 11V,very low voltage, still works very well.Performance is better than any other brand in Chinese market.