Victor Tikhonov wrote: > I can't believe so few get my point. > Frequency input to induction motor, as *separate* single parameter > is under *your* control independent of other variables (voltages) > you apply to the motor because commutator is external (solid state). > > Not the case for brushed DC motor - *you* don't apply frequency to > them. They take care of it with commutator.
I'm not trying to be difficult, Victor. It's just that I don't think frequency is an independent input to either AC or DC motors, or that AC motors "have it" and DC motors don't. Do your Siemens controllers have a frequency input? I would guess that they don't. Instead, they decide on their own what frequency to produce, based on throttle position and motor speed. A brushed DC motor and its controller do the same thing; they decide by themselves what frequency to produce in the coils, based on throttle position and motor speed. -- Lee A. Hart Ring the bells that still can ring 814 8th Ave. N. Forget your perfect offering Sartell, MN 56377 USA There is a crack in everything leeahart_at_earthlink.net That's how the light gets in - Leonard Cohen
