Oscilloscope Waveforms

The following waverforms were all captured using this power supply and this motor.

You will note the waveforms in the photos below never go negative. This is due to the way the the current sensing amplifer built into the LMD18245T driver chip works. Refer the the datasheet for more details.

• Full-Stepping with One Phase On, 200 steps/revolution
  Full-Size Image, 169 kb

• Half-Stepping, 400 steps/revolution
  Full-Size Image, 185 kb

• Quarter-Stepping, 800 steps/revolution
  Full-Size Image, 187 kb

• 1/6 Microstepping, 1200 steps/revolution
  Full-Size Image, 173 kb

• 1/8 Microstepping, 1600 steps/revolution
  Full-Size Image, 180 kb

• 1/10 Microstepping, 2000 steps/revolution
  Full-Size Image, 192 kb

• 1/12 Microstepping, 2400 steps/revolution
  Full-Size Image, 181 kb

• 1/16 Microstepping, 3200 steps/revolution (not part of standard software, requires special version)
  Full-Size Image, 178 kb

• Chopping of Winding Current
  Full-Size Image, 190 kb

• Automatic Idle Current Reduction: The winding current is automatically reduced if no steps are recieved within 3 seconds. The amount of reduction is configured by changing R9 in the R8/R9 voltage divider.
  Full-Size Image, 202 kb

Last Updated: Dec. 15th, 2007

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