Yaskawa Electric Servo Drive Industrial Servo Pack Input 1 phase 400W SGDE-04AS

Yaskawa Electric Servo Drive Industrial Servo Pack Input 1 phase 400W SGDE-04AS
 

Specification 

Model Number:SGDE-04AS
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

If we neglect the reluctance of the iron parts of a magnetic circuit, it is easy to estimate the Xux density in the air-gap. Since the iron parts are then in eVect ‘perfect conductors’ of Xux, none of the source MMF (NI)
is used in driving the Xux through the iron parts, and all of it is available to push the Xux across the air-gap. The situation depicted in Figure 1.7 12 Electric Motors and Drives therefore reduces to that shown in Figure 1.8, where an MMF of NI is applied directly across an air-gap of length g.

To determine how much Xux will cross the gap, we need to know its reluctance. As might be expected, the reluctance of any part of the magnetic circuit depends on its dimensions, and on its magnetic properties,
and the reluctance of a rectangular ‘prism’ of air, of cross-sectional area A and length g as in Figure 1.8 is given by Rg ¼ g Am0 (1:5) 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.

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