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2024-04-29 8:46 pm
My robot project is almost to the point where I'm going to need motors, and drives to run them. I'm expecting to use 24V motors running at 5A max. I found Nexperia MOSFETs (PSMN1R5-25MLH) which might do the trick. At 110A(max) they're grotesquely over-spec'ed, but appear to be reasonably small. For the moment I'm planning to use ESP32 microcontrollers, so the footprint of my motor drives need to be pretty small too. I could also use a source of 24VDC/5A geared motors. What's everybody else using?
2024-04-29 11:52 pm
Nothing that large I’m afraid. I did use 12V motors in my Hide and Seek robots. I liked how quiet they ran but as I remember they caused some problems with an analog circuit I was using to monitor the mechanical bumper. After attaching ceramic caps everywhere I could think of I finally had to re-route the circuit which was kind of a pain as I recall. I used Toshiba’s TB9051FTG brushed DC motor driver from Pololu to drive the 12V motors on the Seeker.
Tom
To err is human.
To really foul up, use a computer.
2024-04-30 12:49 am
Hi @fester225,
Excuse me for butting in, regarding your choice FET. Current wise they are indeed generous, and their size is small, but:
- Do you realise that you will need to amplify the ESP32 output to drive those FETS?
- 25V FETs for switching 24V seems incredibly close to the margin. I would be concerned their avalanche diodes might start conducting.
Just my thoughts, offered in good faith.
Best wishes for your project, Dave
Ron reacted