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L6470: Getting problem with the number of steps in move command

Question asked by Muneeb Ahmed on Oct 26, 2017
Latest reply on Oct 31, 2017 by Enrico Poli

Hello! I am using l6470 on X-Nucleo IHM02A1 with the STM32F4 discovery board with the SPI interface (daisy chaining). I am working on the precision of an autonomous robot with the four mecanum wheels of 10 cm. I am using 128 usteps step mode. When I am giving move command less than 38535 micro steps, it is working fine but for more than ~39000 usteps, the motor is not reacting.

If I change the step mode from 128 usteps to 64 usteps then the value is half of the max number of steps e.g. 19267 usteps.

I have also an issue with the torque of the motor as I can't increase much torque.

I am using BYG42 2 phase stepper motor with 1.7A current and 12V.

I have attached dspin_config file where all the parameters are configured. 

Please tell me, how can I solve this problem.

Thanks in advance,

Muneeb Ahmed