Description: Closed Loop Stepper Motor Kits 2 Phase 57 Servo Motor with Hybird Servo Driver Set.    Specification: Motor details: Phase:2;  Step Angle:1.8 deg;  Current:4.0A;  Inertia Of Rotor:520g.cm²;  Holding Torque:2.2Nm;  Shaft Diameter:8mm;  Motor Total Length:102mm;  Motor Length:80mm;  Motor Weight:1.5Kg.    Driver: Voltage:VDC20-50V;  Max Current:6A;  Subdivision Range:400-51200ppr;  Signal Voltage:+5V(+12Vor+24V series current limiting resistor);   Pulse Width:2.5μS;  Pulse Form:Pulse+Direction/Pulse+Pulse;  Pulse Response Frequency:Max 200KHZ;  Size:115x69.3x26.5mm;  Weight:0.21Kg.    Features: No lost step, accurate positioning.  100% rated torque drive motor.  Variable current control technology, high current efficiency.  Low vibration and smooth operation at low speed.  To select position over tolerance threshold and alarm polarity.  Rich output control.  Single and double pulses can be selected.  Built-in acceleration and deceleration control to improve start-stop smoothness.  Users can customize the subdivision.  1000 line encoders.  General application parameters do not need to be adjusted, the factory has been set up.    Package Included: 1pcs & Closed Loop Stepper Motor;  1pcs & Motor Driver;  1pcs & 0.5 meters Motor Cables;  1pcs & 3 meters Encoder Cables