View Full Version : [Question(s)] Stealthy Bot Design Considerations

09-08-2009, 09:34 AM
I have a number of ideas for a first bot, security-specific, but haven't begun specing it out yet.
One considerationnoise, since the idea of having a security robot detect an intruder, and then attempt to get near them for remote surveillance/ID, while servos WHIZ-WHIZ, or steppers step, or brushless DC motors hum and squeal is counter-productive.

What drive system is the quietest, while still being a reasonable cost.
Do RC brushless motor controllers come in ultrasonic switching-frequency versions?
How quiet can microstepping steppers be?

Macro Man
09-08-2009, 02:29 PM
Hi! :) Small DC motors are very quiet, provided there is no gear train. I would use 2 small DC motors with foam or something rubber around them to make them quiet, and then drive the wheels via rubber belts (o-rings etc) but not the toothed type. That should give you some gearing and if you set it up right (and use high freq PWM so no motor squeal) it would be practically noiseless.