User Manual

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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
direction of motor shafts rotation. The speed of the motor shafts rotation is directly
related to the frequency of the input pulses and the length of rotation is directly
related to the number of input pulses applied.One of the most significant
advantages of a stepper motor is its ability to 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.
Stepper motor 28BYJ-48 Parameters
 Model: 28BYJ-48
 Rated voltage: 5VDC
 Number of Phase: 4
 Speed Variation Ratio: 1/64
 Stride Angle: 5.625° /64
 Frequency: 100Hz
 DC resistance: 50Ω±7%(25℃)
 Idle In-traction Frequency: > 600Hz
 Idle Out-traction Frequency: > 1000Hz
 In-traction Torque >34.3mN.m(120Hz)
 Self-positioning Torque >34.3mN.m
 Friction torque: 600-1200 gf.cm
 Pull in torque: 300 gf.cm
 Insulated resistance >10MΩ(500V)
 Insulated electricity power：600VAC/1mA/1s
 Insulation grade：A
 Rise in Temperature <40K(120Hz)
 Noise <35dB(120Hz,No load,10cm)