TI E2E Community
Motor Drivers Forum
settings DRV8412 EVM Kit revG
I bought a DRV8412 EVM Kit revG, and I have a few questions :
1) I would like to know if the emf is used to control the speed (PWM) of the motor? If yes, how was it program to work?
2) the settings (Ki, Kp, Kd and Kc) were preconfigured for light loads. I would like to know how to change does settings if I want to put a heavy load on one of the DC motor (I have no precise weight in mind yet).
3) In 'Dual DC Brushed motor', I put 20% in 'Voltage mode' and then started the motor, by clicking on 'Enable Motor', with a light load. IFdbk went up until the 'Status Fault' light turn red stopping the motor when IFdbk got to about 5A, but, on the TI website, it says that the motor should be able to support a 6A peak . So, does someone have a idea on why it stop at about 5A?
4) In the QSG-DRV8412-C2-KIT-GUI pdf file, I don't understand the significance of the 0.92A of the DC motor since we can use them at 3A continuous and have 6A peaks.
Can you help please?
1) Only the DC bus voltage is measured and the speed is open-loop. PWM is just increased for increase in speed. Only a current loop is employed with the software released. I have attached a document on the firmware for the brushed DC project. This is also available in ControlSUITE (search ti.com).
2) Knobs are provided to tune the parameters based on your desired loop response. Unfortunately, I do not have a document that describes how to adjust this based on motor parameters.
3) It is possible you are hitting a thermal limit on the device. Per the datasheet, the DRV8412 is rated for 2 x 3A continuous load. Please check the status of the /OTW pin. If this is low, then you hit a thermal limit. You can also adjust the resistor on the OC_ADJ pin per the table in the datasheet if you think you are hitting current limit and would like to increase the limit.
4) The motor provided in the kit is rated at 0.92A DC. There is no significance beyond that.
Motor Drive Application Manager
4401.Dual Axis BDC.pdf
Previously forgot to attach file. Please see attached.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.