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0.5 per unit AIEE analog computer applied braking voltage applied voltage average braking current braking circuit braking voltage connected bridge rectifier circuit of figure complete braking period computer study controlled braking voltage current flowing current with load dc braking voltage dc voltage developed diode current direct current Dynamic Braking expanded recording expanded time scale Figure 22 Figure l0 free acceleration free wheeling diode full-wave circuit Half-wave braking voltage half-wave circuit initial transient motor current motor simulation motor terminals motor voltage open circuit voltage opening the phases peak braking torque phase currents phase in series phase open phase voltage recordings of figure rectified voltage rectifying diode rotor SCR circuit SCR controlled braking scr current show a braking shown in figure Silicon Controlled Rectifier switch thesis Trans transformer unit current unit speed University of Wisconsin variables voltage is applied zero current zero speed