Unipolar Stepper Motor 28-BYJ48



The 28-BYJ48 unipolar stepper motor has five or six wires and four coils (actually two coils divided by center connections on each coil). The center connections of the coils are tied together and used as the power connection. They are called unipolar steppers because power always comes in on this one pole.
The 28-BYJ48 Even comes with Breakout using ULN2003 As a Motor driver chip

Specifications for Motor:
Diameter: 28mm / 1.1in
Voltage: DC 5V
Length: 274mm / 10.8in
Step Angle: 5.625 * 1/64
Reduction ratio: 1/64 
DC Resistance: 200ą7% (25)
Insulation Resistance: >10M (500V)
Dielectric Strength: 600V AC / 1mA / 1s
Insulation Grade: A
No-load Pull in Frequency: >600Hz
No-load Pull out Frequency: >1000Hz
Pull in Torque: >34.3mN.m(120Hz)
Detent Torque: >34.3mN.m
Temperature Rise: <40K(120Hz)
Noise: <40dB (120Hz, No load, 10cm)
Board Size: Approx. 29 * 21mm
Total Weight: 41g / 1.43oz 

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