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L6470 /Soyo SY57ST56-1206A lacks torque at high speed

Question asked by hug.efrem on Aug 1, 2015
Latest reply on Aug 3, 2015 by Enrico Poli
Hello all, I have a L6470 based board powering a 1.2A/ 12V Soyo SY57ST56-1206A motor, and at low speeds it has the expected torque, but it falls off drastically above 300 pps, and by 600 pps it doesn't move at all under no load (I need torque to 1000 pps, the Soyo datasheet shows I should be able to get about 80% at that point)... Perhaps this has something to do with the BEMF slopes but I can't find any information on how I should set them?  Power supply is 4A 12V, KVAL's are set to 0xFF, Voltage compensation off, Full step threshold is at 1000pps right now

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