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| dexter 2006-02-28, 12:36 pm |
| I just joined the group.As i saw the very good ans of queries.My query
is What is the basic difference between V/f and Vector control or
FOC.????
Pls no mathematics...........
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| Salmon Egg 2006-02-28, 6:21 pm |
| On 2/28/06 8:16 AM, in article
1141143400.478741.167570@p10g2000cwp.googlegroups.com, "dexter"
<topradeepsingh@gmail.com> wrote:
> I just joined the group.As i saw the very good ans of queries.My query
> is What is the basic difference between V/f and Vector control or
> FOC.????
> Pls no mathematics...........
>
And no English either.
-- Ferme le Bush
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| operator jay 2006-03-01, 4:21 am |
|
"dexter" <topradeepsingh@gmail.com> wrote in message
news:1141143400.478741.167570@p10g2000cwp.googlegroups.com...
> I just joined the group.As i saw the very good ans of queries.My query
> is What is the basic difference between V/f and Vector control or
> FOC.????
> Pls no mathematics...........
>
Basic difference is that V/Hz just varies the applied ac voltage amplitude
in proportion to the variation in frequency. Vector control uses a PWM
voltage.
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| Bob Ferapples 2006-03-20, 4:21 am |
| On 28 Feb 2006 08:16:40 -0800, "dexter" <topradeepsingh@gmail.com>
wrote:
>I just joined the group.As i saw the very good ans of queries.My query
>is What is the basic difference between V/f and Vector control or
>FOC.????
>Pls no mathematics...........
This should do it for you. FOC is the same as Closed Loop Vector as
mentioned in that FAQ.
http://eng-tips.com/faqs.cfm?fid=1062
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| IVolley 2006-03-20, 11:21 am |
| At its simplest. Volts per hertz control is just that, you adjust the
voltage input in proportion to the frequency as you change speed. The
V/Hz ratio is proportional to the flux in the motor, so you are
assuming that by doing this you are keeping the flux constant in the
motor. Vector control is like controlling a DC motor. You take the
motor currents and by doing some reference frame transformations you
can separate the current into two components: field or flux component
and torque component. By performing this transformation, you are
actually creating decoupled sets of currents and by controlling each
component separately you get much more precise control over the
machine. The main drawback is that vector or field oriented control
requires either position feedback or state estimation for the position.
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