New Servopack YASKAWA Japan Electric 4.4KW 200-230vac 5.9hp
SGDB-44ADG-P
Quick Details
Model Number:SGDE-04VP
Input Voltage:200-230V
Input Frequency:50/60HZ
Input PH : 1
Input AMPS:6.0
Series : Sigma 2 (Σ-II Series)
Output Power : 400W
Output Voltage: 0-230V
Output AMPS: 2.6
Place of Origin:Japan
Efficiency:IE 1
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.
Before moving on to the matter of the air-gap, we should note that
a question which is often asked is whether it is important for the
coils to be wound tightly onto the magnetic circuit, and whether,
if there is a
multi-layer winding, the outer turns are as eVective as the inner
ones.
The answer, happily, is that the total MMF is determined solely by
the number of turns and the current, and therefore every complete
turn makes the same contribution to the total MMF, regardless of
whether it happens to be tightly or loosely wound. Of course it
does make sense for the coils to be wound as tightly as is
practicable, since this not only minimises the resistance of the
coil (and thereby reduces the heat loss)
but also makes it easier for the heat generated to be conducted
away to the frame of the machine.
In motors, we intend to use the high Xux density to develop force
on current-carrying conductors. We have now seen how to create a
high Xux density inside the iron parts of a magnetic circuit, but,
of course, it is
Iron Air-gap Coil
Leakage flux
Figure 1.7 Flux lines inside low-reluctance magnetic circuit with
air-gap Electric Motors 11 physically impossible to put
current-carrying conductors inside the iron.
We therefore arrange for an air-gap in the magnetic circuit, as
shown in Figure 1.7. We will see shortly that the conductors on
which the force is to be produced will be placed in this air-gap
region.
If the air-gap is relatively small, as in motors, we Wnd that the
Xux jumps across the air-gap as shown in Figure 1.7, with very
little tendency to balloon out into the surrounding air. With most
of the Xux lines going
straight across the air-gap, the Xux density in the gap region has
the same high value as it does inside the iron.
In the majority of magnetic circuits consisting of iron parts and
one or more air-gaps, the reluctance of the iron parts is very much
less than the reluctance of the gaps. At Wrst sight this can seem
surprising, since the distance across the gap is so much less than
the rest of the path through the iron. The fact that the air-gap
dominates the reluctance is simply a reXection of how poor air is
as a magnetic medium, compared to iron.
To put the comparison in perspective, if we calculate the
reluctances of two paths of equal length and cross-sectional area,
one being in iron and the other in air, the reluctance of the air
path will typically be 1000 times greater than the reluctance of
the iron path. (The calculation of reluctance
will be discussed in Section 1.3.4.)
Returning to the analogy with the electric circuit, the role of the
iron parts of the magnetic circuit can be likened to that of the
copper wires in the electric circuit. Both oVer little opposition
to Xow (so that a negligible fraction of the driving force (MMF or
EMF) is wasted in conveying the Xow to where it is usefully
exploited) and both can be shaped to guide the Xow to its
destination. There is one important diVerence, however. In the
electric circuit, no current will Xow until the circuit is
completed, after which all the current is conWned inside the wires.
With an iron magnetic circuit, some Xux can Xow (in the surrounding
air) even before the iron is installed. And although most of the
Xux will subsequently take the easy route through the iron, some
will still leak into the air, as shown in Figure 1.7.
We will not pursue leakage Xux here, though it is sometimes
important, as will be seen later.
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| Honeywell TC-,TK- | GE Modules IC - |
| Fanuc motor A0- | Yokogawa transmitter EJA- |
