Current reduction

[krissi]

Hi there,

I have a question concerning the TMC260 stepper driver. I want to reduce the motor current while the motor is in standby. As far as I can see there is no automatic way to do this since coolStep doesn't work in standstill. So the only way to achieve this is by readjusting the current setting over the SPI bus after and before each driving operation. I am correct?

Thanks in advance for your help

Regards
Kristian

[TRINAMIC_BD]

Hello,

yes, for standby current reduction you need to set the standby current via the interface before / after a move. If you want to have it very smooth, you can decrease standby current step by step from the driving current to the desired standby setting.

[Ivanwu]

Dear All

Excuse me!
Maybe I hvae the same question too^^
Now,we use the own driver with TMC260 to drive Step Motor,and it can work
But,when the Motor drive long time,Motor it is too hot can't touch over 5 second

The following is our problem:
1.Why we already open the TMC260 Coolstep Function,the motor still have rise temperature and heat
2.Can we use CoolStep Function to set standby current and drive current are different at the different and change automatic by CoolStep?
3.If all of the above are right,I think I set out on the issue~and please tell me how to correct setting and open this function(CoolStep),Can do more than one function that the motor does not heat~

[TRINAMIC_BD]

Hello,
coolStep works in a certain velocity range. At low velocities, it does not work. So, you need to do standby current reduction by software. And, coolStep should only be switched on, when some minimum velocity is exceeded. You should read out the SG value (e.g. using the TMC262-EVAL) to find the usable range. You should tune coolStep in an interactive way with your motor. It is best seen, when you plot SG value and actual current scale on your computer and try loading the motor with your fingers.

A stepper motor should be mounted to a metal flange for cooling. However it is allowed to heat up up to 80°C (at nominal current).

[Ivanwu]

Dear B. Dwersteg (TRINAMIC)

Thank you for your reply
I will try this way you provide