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Yaskawa Output 4.4AMPS SERVO PACK Industrial Servo Drives 750Watt SGDE-08AP
Quick Details
SGDE02BP SERVO DRIVE
SGDE02VP 4.0AMP 1PHASE 50/60HZ 200/230VAC
SGDE03BS SERVO DRIVE
SGDE04AP 200-230VAC 50/60HZ 6A
SGDE04AP 200-230VAC 50/60HZ 6A
SGDE04AS SERVO DRIVE
SGDE08AP SERVO DRIVE
SGDE08APY1 SERVO DRIVE
SGDE08AS SERVO DRIVE
SGDE08VP(R) SERVO DRIVE
SGDE08VPR SERVO DRIVE
SGDE08VS 11AMP 1PHASE 50/60HZ 200/230VAC
SGDEA3AP SERVO DRIVE
SGDEA3VP SERVO DRIVE
SGDEA5AP SERVO DRIVE
SGDEA5BP SERVO DRIVE
SGDEA5BS SERVO DRIVE
SGDEA5VP SERVO DRIVE
where m0 is the so-called ‘primary magnetic constant’ or ‘permeability of free space’. Strictly, as its name implies, m0 quantiWes the magnetic properties of a vacuum, but for all engineering purposes the permeability of air is also m0. The value of the primary magnetic constant (mo) in the SI system is 4 107 H/m; rather surprisingly, there is no name for the unit of reluctance.
In passing, we should note that if we want to include the
reluctance of the iron part of the magnetic circuit in our
calculation, its reluctance would be given by Rfe ¼ lfe Amfe and we
would have to add this to the reluctance of the air-gap to obtain
the total reluctance. However, because the permeability of iron
(mfe) is
so much higher than 0, the iron reluctance will be very much less
than the gap reluctance, despite the path length l being
considerably longer than the path length (g) in the air.
Equation 1.5 reveals the expected result that doubling the air-gap
would double the reluctance (because the Xux has twice as far to
go), MM while doubling the area would halve the reluctance (because
the Xux has two equally appealing paths in parallel). To calculate
the Xux, F, we use the magnetic Ohm’s law (equation 1.4), which
gives F ¼ MMF R ¼ NI Am0 g (1:6)
We are usually interested in the Xux density in the gap, rather
than the total Xux, so we use equation 1.1 to yield B ¼ F A ¼ m0 NI
g
Equation 1.7 is delightfully simple, and from it we can calculate
the airgap Xux density once we know the MMF of the coil (NI) and
the length of the gap (g). We do not need to know the details of
the coil-winding as
long as we know the product of the turns and the current, nor do we
need to know the cross-sectional area of the magnetic circuit in
order to obtain the Xux density (though we do if we want to know
the total Xux,
see equation 1.6).
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