I am currently working on a scientific project that requires precise and continuous low-speed rotation using brushless motors. I am contacting you to ask for advices in choosing the appropriate brushless DC (BLDC) motors and electronic speed controllers (ESCs) for this application.
The project involves rotating a lightweight platform (under 500 grams) continuously over a period of 12 days. The rotation must be slow and smooth, with the speed and direction changing randomly approximately every 20 seconds. The desired speed range is between 0 and 2 RPM. The motors will be controlled by a Raspberry Pi Pico that will generate standard PWM signals to set the speed through the ESCs. I am currently using two SM-s4315R servos (standard size), and they work fine for the torque but aren’t meant to function for such a long a continuous period of time.
The ideal motor and ESC combination should meet the following requirements:
- Ability to operate at very low speeds (as low as 0.5 RPM) with smooth and reliable rotation
- Quiet operation, suitable for use in a laboratory environment
- Long-term durability for continuous operation over several days
- ESCs that accept standard PWM input (1000–2000 µs) and support low-speed control
- I am currently using a 5V power supply, but I could change if needed
If you have motors (such as gimbal-type brushless motors) and ESCs that you believe would be suitable for this application, I would be very grateful for your recommendations.
Thank you very much for your help!