2015-09-05 02:10 PM
I am using three L6474s to drive NEMA23 format motors.
Using the default register configurations the chips are rapidly getting very hot and causing a TH_WRN condition. I found a post here that stated that the default config caused high frequency switching which produced ''strong'' heat dissipation. It also recommended some alternative configuration, the main change of which was reducing TON_MIN from 20.4 µs to 4µs . There was also suggest that some configurations lead to the control algorithm being unstable. I did that and reduced slew-rate and now the chips are getting to a much more reasonable circa 60 deg. C. while this did provide a convenient opportunity to test my ISR handling FLAG input change, it seems odd that the chip is not supplied with a better default configuration. What kind of motor loading is the default config suitable for? Now with about six configurable parameters for internal algorithm, this semi-arbitrary set of values seems more of a hack than an engineered solution. Is there any guidance on how to tune these parameters to reduce dissipation and avoid possibly unstable configurations? Thanks.2015-09-07 05:24 AM
Ciao
I suggest touse the following forum for question related to stepper or monolitic driveshttps://my.st.com/public/STe2ecommunities/motordriver_ics/Lists/Motor%20Driver%20ICs%20and%20Boards
Ciao Gigi2015-09-08 03:49 AM
2015-09-08 04:55 AM
Ciao
At the moment for ''Motor Control Firmware'' we intend primary the STM32 FOC control for three phase brushless motor. (We covere here also topic related to the HW for 3ph motors) For question regarding stepper or other kind of motor drives based on IC (like L64xx family) is better to use the other forum. Ciao Gigi2015-09-09 09:18 AM
Thanks Gigi,
I posted it where you suggested but after four views and no replies, clicking on the message gives no content. I tried to post anew but no the interface has no place to enter a title, so I have a message called ''no title''. Looks like the forum software is in state of flux too.2015-09-09 09:25 AM
No idea what is going on with the forum software today. clicking on my copy of this msg that I posted there returns:
<< There are no items to show in this view of the ''Motor Driver ICs and Boards'' discussion board. To create a new item, click ''New'' above. >> :?