原来,东风型内燃机车施行电阻制动时,是由调节反馈电阻R_(fk)的阻值来调节制动电流大小的。原理线路如图1所示,由于F_1F_2绕组磁势方向与励磁机L的主磁势方向相反,因此,当减小R_(fk)阻值时,反馈电流增大,则削弱励磁机的励磁,最后使制动电流减小。反之,制动电流就增 It turned out that the implementation of resistance braking Dongfeng diesel locomotive, by adjusting the resistance of the feedback resistor R_ (fk) to adjust the size of the brake current. Principle line as shown in Figure 1, the F_1F_2 winding magnetic potential direction and the exciter L of the main magnetic potential in the opposite direction, therefore, when reducing the R_ (fk) resistance, the feedback current increases, then weaken the exciter excitation, Finally, the brake current is reduced. On the contrary, the brake current increases