Stepper Motor 5V 4-Phase 5-Wire ULN2003 Driver Board a Stepper Motor is an Electromechanical Device which Converts Electrical Pulses Into Discrete Mechanical Movements. The shaft or spindle of a stepper Motor Rotates in Discrete Step Increments When Electrical Command Pulses are applied to it in the proper sequence. The Motors Rotation has Several Direct Relationships to These Applied Input Pulses. The sequence of the Applied Pulses is directly related to the director of motor shafts rotation. The Speed ​​of the Motor Shafts Rotation is directly related to the frequency of the input pulses and the lenth of rotation is directly related to the number of input Pulses. Be Accurately controlled in an open loop system. Open Loop Control Means No Feedback Information About Position is Needed. This type of control eliminates the need for expensive sensing and feedback devices such as optical encoders. Your position is Known Simply by Keeping Track of the Input Step Pulses.Features the Rotation of the Motor is Proportional to the Input Pulse.The Motor has full torque at standstill (iF the Windings Are energized) Precise and Repeating and Repeating and Repeating and Repeating and Repeating and Repeating and Repeating and Repeating Ity of Movement Since Good Stepper Motors have an accuracy of 5% of a step and this enror is non cumulative from one step to the next.Excellent Response to Starting/Stopping/Reversing. Therefore the life of the motor is simply dependant on the life of the bearing.The Motors Respons to Digital Input Pulses Provides Open-Loop Control, Making the Motor Simpler and Less Costly to Control.it is Possible To ynchronous rotation with A load that is directly cated to the shaft.a wide rope of rotational speeds can be realized as the speed is proportional to the frequency of input pulses.stepper motor parameters rated voltage iation ratio ： 1/64stride angle ： 5.625 /64frequency: 100Hzdc Resistance ： 50 7%(25 ℃) IDLE IN-TRACTION FREQUENCY: 600hzidle out-Traction Frequency: 1000Hzin-Traction Torque 34.3mn.m (120Hz) self-positioning torque 34.3mn.mfriction torque: 600-1200 gf.cmpull in Torque: 300 gf.cminsulated Resistance Electricity Power ： 600VAC/1MA/1sinsulation Grade ： Arise in Temperature & Lt; 40K (120Hz) Noise & Lt; 35DB (120Hz, No Load, 10cm)