Download Electromagnetic Clutches and Couplings by T. M. Vorob'yeva, O. M. Blunn, D. W. Fry and W. Higinbotham PDF

By T. M. Vorob'yeva, O. M. Blunn, D. W. Fry and W. Higinbotham (Auth.)

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7. Torque and output as a function of the outside diameter of the clutch. phenomena which occur in the clutch during transient conditions which may render clutches designed from steady state conditions unsuitable. This must be borne in mind especially for clutches which are frequently switched on and off. (b) The main operating characteristics Figure 8 shows the torque as a function of the number of plates. It will be seen from the diagrams that the torque is a m a x i m u m for a certain number of plates.

Curves for the distribution of inductance over the height of the gap. 1 0 (hcl2)+e B(x) dx, k = B'„(e) hi = tiDavWhc. e. that bounded b y the curve in Fig. 17 through points 1, 2, 3, and 4 ) . 48 ELECTROMAGNETIC 3 CLUTCHES A N D COUPLINGS < / ' f\ / 8 / 4 0 / yr 1 2 4- 8 10 1 I 12 /4 16 18 mA FIG. 16. Experimentally-determined curves showing the pressure on the friction roller of a magnetic coupling as a function of the current in the working coil (e is the displacement of the coil). If the coil is displaced b y a quantity — ex or + e2 the area corresponding to k u and k m will be 1', 2 ' 3 ' , 4 ' and 1", 2", 3", and 4" respectively.

13 (g). Having thus found the value of the magnetic conductance of all the sections of the magnetic system, we add their values and hence obtain the equivalent total conductance of the magnetic circuit gs (without including the reluctance of the magnetic circuit). Knowing the total conductance of the system, there is no difficulty in finding the induction in the air gap b y the formula Bd = BmSm where Bm is defined graphically (Fig. 13, h) as tan a = gs where ME and MB are the scales along the axes B and II for the curve in Fig.

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