> ? 2 = 0.25 mm; winding power voltage U = 36 V; magnetic circuit material is stee of quality 50HXC; (Iw) w = 764.32 A.bulging fluxes will be neglected as the dimensions of the pole. According to equivalent circuit, figure 2.1., Operating and parasitic air-gaps permeances will be determined.air-gap:
В
, Ој0 - is magnetic constant, or vacuum permeability,;
d - is the diameter of the core, m;
? п - is the value of the operating air-gap, m.air-gaps:
В
, Ој0 - is magnetic constant, or vacuum permeability,;
h - is the distance between the core and the yoke, m; - is the thickness of the core, m;
? п - is the value of the operating air-gap, m; - is the diameter of the core, m.
- it was found in the 1st part.permeance is equal to:
В
В В В
3.2. Determination of initial estimate magnetic flux through the air-gap
to the determination of MMF:
В
where Ф - is the magnetic flux, Wb;
?? - Is the magnetic permeance, H.
In our case we may use for first approximation the next formula:
В
from which:
В
В
Then the induction of the core is found:
В
В
where Ф - is the magnetic flux, Wb;
?? - Is the magnetic permeance, H;
d - is the diameter of the core, m.the found induction is greater than the saturation induction the saturation one is taken from the graph of magnetic curves:
, then
В
this graph we also must find magnetic intensity of the steel:
В
Then the induction of the armature and the base of the yoke is found
В
,
where Ф - is the magnetic flux, Wb; - is the diameter of the yoke, m; - is the thickness of the core, m.the graph of magnetic curves the magnetic intensity of steel is found :
В
Then one can find the induction of the yoke:
В
,
where Ф - is the magnetic flux, Wb; - is the diameter of the yoke, m; - is the distance between the core and the yoke, m.the graph of magnetic curves the magnetic intensity is found:
В
Now lets find the potential magnetic drop of the iron:
В
, the magnetic flux can be found:
В
that everything from the formula 3.1 should be repeated till the relative difference between previous and new approximation of magnetic flux is equal to 5%.
1234Ф, mWb0.540.430.4050.398Bc, T1.10.880.780.76Ba/Bb, T0.350.240.180.15By, T0.090.0770.0590.033Hc, A/m400050010014Ha/Hb, A/m10987Hy, A/m32.92.32
3.3. Determinat...
