Motor is ray CME57 stepper motor, the encoder is 1000 lines of incremental photoelectric encoder, as long as A plus or minus, B + channel, no N channel encoder need external special VDC power supply 5 V, I use is 4 * 1.2 V batteries, 7 A, B two channel through the oscilloscope waveform display, here is the motor under different rotational speed waveform figure, it will be two morally cycle of square wave signal phase difference of 90 degrees, how to look and see phase difference of 90 degrees, do not see A little standard square wave, which has A big, predecessors under the guidance, the next will be appreciated!!!!!!
1 RPM speed of; 
rate of 10 RPM; 
speed is 100 RPM; 
speed is 600 RPM;