ervo systems such as those used in the airborne taken range and azimuth indicator drive sys tems and in driving the deflection yokes on the radar PPI indicators, as well as most avionics applications. To under stand servomechanisms employing induction motors it is first necessary to know the characteristics of these motors. Figure 4 shows the rotor, cross section, and circuit diagram representation of a two-pole, two-phase induction mo tor. Stator and rotor are built of sheet steel laminations. The stator has two similar windings, coil A and coil B, arranged so their ic fields will be at right angles to each other. The rotor may carry either a short-circuited winding of wire or a squirrel-cage winding. The squirrel-cage winding con sists of conducting bars in the rotor slots the bars being
全文预览
