Hello, Erik! Erik Christiansen wrote:
While fooling with FET drive for a 200 watt DC motor, there was a fair howl emanating from the motor when the PWM frequency passed through mechanical resonances. I've read of ruined bearings in large motors, due to arcing through the lubricant, due to voltage build-up on the rotor, apparently exacerbated by peaky drive, but the wear effects of continuous high frequency mechanical vibration doesn't seem to be mentioned much.
This is really OT. I did some motion control with high-end motion controllers from Delta Tau about two years ago. There are ton's of Amplifier Manufacturers for DC Brushless motors i.e. (i.e. ELMO Flute) Check their design and you will see that they have (sometimes) some pretty complex Filters mainly to improve the loop stability, but also to reduce EMI. You could also contact some Motor Manufacturers (i.e. Maxon) and ask them about their opinion, but I guess they will just tell you that everything is fine, as long as you use their motors. :-) But please, that's too complex to be discussed here. Find a proper list for your questions. Best greets, Clemens Koller _______________________________ R&D Imaging Devices Anagramm GmbH Rupert-Mayer-Str. 45/1 81379 Muenchen Germany http://www.anagramm.de Phone: +49-89-741518-50 Fax: +49-89-741518-19 _______________________________________________ AVR-chat mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-chat
