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DRV11873: DRV11873 for very slow speed gimbal motor control
DRV11873 is intended for applications where motor is running all the time. You can certainly use DRV11873 to move to desired position but you will need other ways to hold the desired position.
Thanks for your response, I use gimbal motors as a direct wheel motors in my robot. questions:
Can I disconnect power to the motor with DRV11873? Is there an enable signal?
Can I use a one of the three fases to stop the motor?
I need slow motion from zero rpm to start the motion of the robot, and I need too: free wheels for free movement and zero energy comsuption and in the other hand stop the wheels powering the magnets of the motor without squence, is there another better option as blcd driver?
Can I disconnect power to the motor with DRV11873? Is there an enable signal?
[KS] You can use PWMIn pin, when this pin is driven to 0 V(GND) it will stop driver.
Can I use a one of the three fases to stop the motor?
[KS] Can you please elaborate question here
I need slow motion from zero rpm to start the motion of the robot, and I need too: free wheels for free movement and zero energy comsuption and in the other hand stop the wheels powering the magnets of the motor without squence, is there another better option as blcd driver?
[KS] Another 12 V integrated BLDC driver I would recommend is DRV10975, DRV10975 has EEPROM which can be configured to have different startups profile and so on.
Thanks for your response and for your time, two questions:
1- DRV11873, I the last post I wrote relative to the DRV11873: "Can I use a one of the three fases to stop the motor?", my question is: can I injecting dc current through a particular phase to force the motor to stop and align the magnets with that phase of the DRV11873?
2-DRV10975, thanks for the recomendation, my question is about how to stop the motors after a movement. Example, my two wheeled robot goes forward some seconds and after this I want to stop it. I have seen on DR101975 datasheet two functions: 9.4.3.4 Motor Brake and 9.4.3.5.1 Align, can I use these two functions to stop the motors and the robot? which is better?
1- DRV11873 doesn't have any mode similar to the one you are looking for.
2- Align state: Device enters this state during startup and not when motor is been stopped.
Brake state: Motor will enter brake state when direction is changed by changing the logic on 'DIR' pin. I think best option is to stop motor quickly to enable inductive AVS, when inductive AVS is enabled it will turn OFF high side (low side will be ON) for sometime(~400 uSec) and then turn OFF low side ( tristate). Refer 9.4.8.2 Inductive AVS Function section in datasheet for details.
