simscape problem
in [Matlab]
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From: Arnaud Miege on 25 Jun 2010 12:20 "Filippo Malvezzi" <malpippo(a)yahoo.it> wrote in message <hopopm$npe$1(a)fred.mathworks.com>... > I am doing a simple model in simscape of a shaft connecting a motor with a generator. > Right now I generate a constant torque from my motor (10) and a constant resistant torque from the generator (-5). I have connected a rotational reference to each the torque sources. > After the Torque sources I have put an inertia for the motor and one for the generator (0.01 each). Now I put a sensor for the velocity of the shaft (between the shaft and the rotational reference) and one sensor for the torque on the shaft(in the line connecting motor and generator). > I am expecting these results: > Torque Motor – Torque generator = (Inertia Mot + Inertia Gen)*d(OMEGA ROTOR)/dt > > I expect the slope of the velocity to be (10-5)/0.02=250 and in fact it is so. > The velocity sensor works. > The problem is with the torque sensor, the result for the torque is 7.5 instead of 5. > Where is the mistake, could you help me please. > Thank you. Could you post your model or at least a snapshot of it somewhere? It's difficult to "see" what your model looks like. One thing to remember is that torque is a through variable and therefore must be measured in series, not in parallel. HTH, Arnaud
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