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DRV8825: Oscillations on Motor driver IC output

Part Number: DRV8825

Hi,

We are using DRV8825 IC for driving Peristaltic Pump which is having stepper motor. We designed one fixture to simulate the motor with equivalent inductor and resistance.

When we tested both actual motor and simulated loads with DRV8825 IC, we found current waveforms for both scenarios are different. I am attaching the waveforms with actual motor and simulated loads here.

Can someone help me in understanding what is the difference between these two setups?

Thanks in advance.

Best Regards,

Raju

With Actual Pump @ 20 rpm:

With Zoom:

With Simulated Load @ 20 rpm:

with zoom: