How to eliminate stepper motor jitter

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eiphan

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I am controlling bi-polar stepper motor with microstepping mode (1/16 step) using PIC18. But I found some jitter when it comes to reduced speed. Can anyone have idea how to elimate? I prefer software solution. To control speed, variable frequency step is used. Is there any alternative way to control speed of stepper motor? I use big easy driver from sparkfun as stepper motor driver. Thank you.
 

Re: stepper motor jitter

Stepper motors incur a fair amount of jitter just due to the fundamental design of the motor. Are you sure that you are operating the stepper motor at the proper step frequency? Are the PWM signals that you are using at the same frequency suggested by the data sheet. That is one of the main reasons for jitter - incorrect frequencies.

Regards,
Willis
 
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    eiphan

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Re: stepper motor jitter

Thank you Willis. The stepper motor step frequency is not fixed. It is variable that depends on speed. I am controlling stepper motor speed as well as distance (number of step count). I do not find anything about frequency in datasheet. I have attached the datasheet. Thank you for your feedback.
 

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