Mini Servo Motor Tower Pro SG 90

• Model:SG90 Servo Motor 9G
• Control System:PPMWorking
• Frequence:1520μs / 50hz (
• RX) Required Pulse:3.3 ~ 5 Volt Peak to Peak Square Wave
• Operating Voltage:4.8 ~ 6 V DC Volts
• Operating Speed (4.8v):0.15 Sec/60 Degrees
• Operating Speed (6v)0.12 Sec/60 Degrees
• Stall Torque (4.8v):1.3kg/cm
• Stall Torque (6v):1.5kg/cm
• Motor Type:Brushed DC MotorGear
• Type:Plastic Gears
• Case Material:Plastic
• Programmable:NOConnector
• Wire Length:24.0cm (9.4 inch)
• Dimensions:23 x 11.5 x 24mm

Unlike dc motors, with servo motors you can position the motor shaft at a specific position (angle) using control signal. The motor shaft will hold at this position as long as the control signal not changed. This is very useful for controlling robot arms, unmanned airplanes control surface or any object that you want it to move at certain angle and stay at its new position.