Figure 6.7. Schematic of the four-pole electromagnetic brake (a) and its momentum characteristic (b). the rotating rotor. Depending on the speed of rotation of the rotor <vp the current in it changes, as well as the magnetic field in the gap. The interaction of the axial component of currents with the radial component of the resulting magnetic field defines its mechanical characteristic . The expression for its characteristic, which is obtained without a consideration of the inductive resistance, has the form [30] where is the amplitude of induction of the first harmonic of the primary magnetic field; and are the magnetic permeability of the vacuum and the magnet constant; p is the number of pairs of poles; is the average diameter of the rotor; a is the half-length of the inductor; is the air gap; is the thickness of the rotor; is the average length of the magnetic strength line; is a coefficient which considers the effect of the higher harmonics of the field (for these brakes ; is a coefficient which characterizes the salient pole of the inductor for salient pole machines , for the brakes which were used is a coefficient which considers the shape of the field of the longitudinal reaction of the armature ,
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