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From: James on 4 Aug 2010 10:46
Hello,

I'm trying to simultaneously measure the torque and angular velocity of the DC motor shaft in the elec_controlled_dcmotor example. I've tried two methods:

1) adding the "ideal torque sensor" in parallel to the "ideal rotational motion sensor"
and
2) adding the "ideal torque sensor" in series between the DC motor and the "ideal rotational motion sensor"

In case (1), measured torque is non-zero (seems right), but the angular velocity is 0 (should not be the case).

In case (2), measured torque is 0 (incorrect) and the angular velocity is correctly measured.

What is the recommended method for simultaneously measuring both torque and velocity from the DC motor shaft?

Thank you,

James
From: Jean Baptiste Lanfrey on 12 Aug 2010 04:15
Hi James,
torque sensor should be placed in series (as a current sensor), velocity
sensor in parallel (as a voltage sensor)
You can have a look at the shipping demo "ssc_rot_system_stick_slip.mdl"
that includes both torque and velocity sensors.

Jean-Baptiste


"James " <jasmith(a)ee.ryerson.ca> a �crit dans le message de news:
i3bufb$q3b$1(a)fred.mathworks.com...
> Hello,
>
> I'm trying to simultaneously measure the torque and angular velocity of
> the DC motor shaft in the elec_controlled_dcmotor example. I've tried two
> methods:
>
> 1) adding the "ideal torque sensor" in parallel to the "ideal rotational
> motion sensor"
> and 2) adding the "ideal torque sensor" in series between the DC motor and
> the "ideal rotational motion sensor"
>
> In case (1), measured torque is non-zero (seems right), but the angular
> velocity is 0 (should not be the case).
>
> In case (2), measured torque is 0 (incorrect) and the angular velocity is
> correctly measured.
>
> What is the recommended method for simultaneously measuring both torque
> and velocity from the DC motor shaft?
>
> Thank you,
>
> James


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