Re: Torque control in BLDC motor

Thank you for your answer. Sorry for the confusion, I want send to *
[email protected].*
**
I'm asking if my statement is correct, because I'm interesting in have
a particular torque in any speed (as fast as possible).

Thanks


Best Regards.



Igor






**



2006/2/23, David Brown <[email protected]>:
>
> As someone else said, this is not the right group, but you might get lucky
> -
> the MPC5xx chips are often used for motor control.
>
> If everything is running properly (you're switching steps at the right
> place, and that sort of thing), then the torque is directly related to the
> current.  Some current is "lost" to heating, and to generating or reducing
> magnetic fields, but the rest is then directly proportional to the torque.
> So what you want to do is control your current.
>
> However, there is no way to control the speed and the torque
> independantly,
> since the speed is directly dependant on the torque.  It's easier if you
> think about the linear equivalents (at least, I find it easier) - torque
> is
> the equivalent of force.  In asking to control the speed and the torque
> independantly, you are asking to control a speed and a force
> independantly.
> If you are pushing something along a path, and start pushing harder (all
> other things, like friction, being equal), you go faster.
>
> Does that help?
>
> David
>
>
> > Hello:
> >
> > I'm doing a torque control project in a BLDC motor. At the moment, I'm
> > testing diferent power stages with MC33035P and after I shall do the
> > specific torque control.
> > I want help to assist with the motor force independently of the speed.
> > My first strategy is do a test to the motor and find torque,speed and
> > current curves.
> > I have thought use T=K1*i(t)-K2*w(t), in a Look up table, where my input
> is
> > torque needed assist at the maximum speed possible of motor. The output
> is
> > the current, and with this, the voltage and the duty cycle necessary to
> get
> > this current(torque).
> > What think about this?? Is it correct??
> >
> > Thank you and sorry for my english.
> >
> >
> >
> > Best Regards.
> >
> >
> >
> > Igor
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > -----------------------------------------------------------
> > To learn more about Freescale Microcontrollers, please visit
> > http://www.freescale.com/mcu
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
> -----------------------------------------------------------
> To learn more about Freescale Microcontrollers, please visit
> http://www.freescale.com/mcu
>
>
>
>
>
>
> SPONSORED LINKS
>   Freescale semiconductor inc<http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=K2HGv-zFlv5OYUv_QxIq_Q>
> Microcontrollers<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=SYHwNJjjGQXRvtt_GybT4g> Pic
> microcontrollers<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=umVbbnUwsPzEzKKD_pQfUw>  8051
> microprocessor<http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=NO-nSKjHoAlh9XtZ8LB1_A>
>  ------------------------------
> YAHOO! GROUPS LINKS
>
>
>    -  Visit your group "MPC500 <http://groups.yahoo.com/group/MPC500>"
>    on the web.
>
>    -  To unsubscribe from this group, send an email to:
>     [email protected]<[email protected]?subject=Unsubscribe>
>
>    -  Your use of Yahoo! Groups is subject to the Yahoo! Terms of
>    Service <http://docs.yahoo.com/info/terms/>.
>
>
>  ------------------------------
>


[Non-text portions of this message have been removed]



-----------------------------------------------------------
To learn more about Freescale Microcontrollers, please visit
http://www.freescale.com/mcu


 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/MPC500/

<*> To unsubscribe from this group, send an email to:
    [email protected]

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/