A shunt motor can act very much like an AC induction motor in this regard. This is a reason they are popular for escalators, conveyor belts, and elevators -- you give them more load and they hardly slow down. Sometimes they are called "constant speed" motors. Putting more voltage on a shunt motor doesn't speed it up, but makes it "stiffer" against slowing down under load.
Also, an AC induction motor does slip, and until breakdown more slip = more torque (like a shunt motor!). --- Victor Tikhonov <[EMAIL PROTECTED]> wrote: > Also increasing [AC] voltage will not > make AC motor run faster. *You* need to take care of frequency > increase to achieve that. This is different from DC motors where > the frequency converter (commutator) is part of the rotor and you > have no control over that (cannot control frequency and voltage > separately as you can for AC motors. > > High voltage and low frequency makes the motor "stiff", spinning > with some RPM regardless of the load (almost like stepper motor), > while lower voltage will make it "softer". You cannot do that with > DC motor - higher load will inevitably lower its RPM. > (closed loop controls aside here). __________________________________________________ Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes http://finance.yahoo.com
