
110 Shipboard Electrical Power Systems
losing much accuracy. Denoting the constant rotor resistance R
r
and leakage induc-
tance L
r
at stator frequency f, the rotor reactance X
r
= 2 π f
r
L
r
varies directly with the
slip frequency f
r
= s × f. The 3-phase stator voltages produce rotating magnetic ux
of amplitude determined by the basic voltage Equation 3.2 in Chapter 3. The sta-
tor ux, less the leakage ux, ows in the magnetic circuit through the air gap and
produces voltage in the rotor conductors equal to (Slip × V
BR
), where V
BR
= induced
voltage in the rotor at blocked-rotor (i.e., speed = 0 or slip = 1.0). Since V
BR
is linearly
proportion ...