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L6472 current consumption way higher than set current

deshmukh
Associate

Hello,

I am using an L6472 stepper motor controller.

I have an EVAL6472H board coupled over SPI to a nucleo L4R5Zi board on SPI.

I am running the motor controller on Step Clock mode. 

I am setting the hold current to 200mA. When the motor runs, I am updating the current to 1A.

After motion is complete I update the current to 200mA again. 

The power supply is 24V.

I can see that when I set the current to 200mA, I can see the coil voltages are ~200mV; the impendance of the coils is ~1.1ohm.

However, there is 70mA current flowing through the power supply which is approx 1.68W.

I tried with other current settings and the power supply seems to source almost 2W higher than required.

What am I missing here, or has anyone come across this problem? 

Request someone to help me with this.

I thank you in advance!

Makarand Deshmukh

1 REPLY 1
Laurent Ca...
Lead II

The question has been moved from the "STM32 Motor Control" section to the "Motor Control Hardware" section (the question is not about the STM32 MC SDK). 

Best regards