RE: What is the approach used to start PMSM when not knowing the position of...
"do we need saliency to track initial position." for a high frequency injection technique, yes"In case of Surface pole mounted PMSM there is no saliency, in that case what is the approach" extremely...
View ArticleWhat is the approach used to start PMSM when not knowing the position of the...
Hi,I am using the DRV8312 kit to turn a PMSM motor. When I look into the "\ti\controlSUITE\development_kits\DRV8312-C2-KIT_v128\PM_Sensorless" project, I am wandering what is the approach used to...
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RE: DRV8825: Irregularities in output waveform
Hello Luis,I completed the respin and have tested the new Rev C board with the same results as Rev B. I still see serious irregularities in the PWM output and the motion of the stepper motor is...
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DRV8825: Irregularities in output waveform
Part Number: DRV8825I am designing a custom controller board for controlling steppers on a telescope mount. For my initial prototype (Rev A) I used two Pololu DRV8825 Stepper Motor Driver Carrier...
View ArticleRE: DRV8305: device danaged more times with AVDD 0V after crash
I uploaded the schematics. Im not sure if you see that. I try it again after my comments.You see it is the circuit from the datasheet proposal.I drive the board via the edge connectors with an atmel...
View ArticleRE: DRV8305: device danaged more times with AVDD 0V after crash
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View ArticleRE: DRV8305: device danaged more times with AVDD 0V after crash
Hello, For RS1, RS2, and RS3, are these all copper trace sense resistors? When you've seen these boards fail, do you know the temperature of the PCBs? I'm curious if the resistance of your copper shunt...
View ArticleRE: DRV8305: device danaged more times with AVDD 0V after crash
Hello, That were my thoughts too, but then I calculated: The copper trace Resistors have an value of 10 mOhms. The temprature of the board was during the fail about 60...70 °C. The copper traces were...
View ArticleRE: DRV8305: device danaged more times with AVDD 0V after crash
When I have my repaired boards back, I will monitore the SP+/SP- Voltage under test and trace the spi MISO datas after triggering the active nFault condition.What about the critical short time peak of...
View ArticleRE: DRV8305: Delay time
Hello Yamamoto-san, for the 12.2ns, could you please show a timing diagram for your question for better understanding and support. Thank you very much.
View ArticleRE: DRV8305: Dead time over temperature
Hello Yamamoto-san, For the dead time matching over temperature, we have seem typical shift in characterization data of a 50ns delta at 125C.
View ArticleRE: DRV8834: DRV8834 not working
Hello Rakesh, Are you using the DRV8834 EVM or a custom board? What is your VM, Iout? You mentioned your board was working and nothing change, then have you tried another motor? Do you see the motor...
View ArticleDRV8834: DRV8834 not working
Part Number: DRV8834Hello sir,I am working with drv8834.i am running 20dam20i0-k stepper motor from portescap.i am running motor in indexer mode.when i stared working with this driver IC i was able to...
View ArticleRE: DRV8701: Operating DRV8701 and H-Bridge on Separate Supplies
Hello Holger, Vbat <10V falls under Case 3 for the most part. Can you please confirm what is the lowest voltage you expect Vbat to drop?
View ArticleRE: DRV8701: Operating DRV8701 and H-Bridge on Separate Supplies
Hello Luis, thanks a lot for your fast response. Well, the problem - as I understand it - is not only that Vbat drops below 10V, but that VM remains at 24V at that moment. In figgure 33 on page 27 a...
View ArticleRE: DRV3201-Q1: Safety documentation according to ISO 26262
Hi Andreas, For the additional safety documentation we've updated the requirements and we will need to have the DIA in place before we share them. I have sent you a PM on the forum with additional...
View ArticleDRV3201-Q1: Safety documentation according to ISO 26262
Part Number: DRV3201-Q1We are developing a safety critical motor control ECU primarily for automotive applications. Other potential application areas are industry and maybe military. One of the...
View ArticleRE: ISO5500: ISO5500 vcc2 & Ve issue
Hi Manish, Could you please check with customer what kind of tests are conducted? What is the test setup? Please ask customer to capture waveforms of gate voltage, voltage on the DESAT pin, IGBT VCE...
View ArticleISO5500: ISO5500 vcc2 & Ve issue
Part Number: ISO5500Hello sir,customer is facing the problem in ISO5500 , the issue is Vcc2 and Ve is short but IGBT is safe. why?I have attached the...
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RE: DRV8825: Irregularities in output waveform
Hi Luis,I am adding current traces for all three decay modes. As you can see none of them is ideal.Thanks for your help.John
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