https://wodewangzhishime.blogspot.com/2021/12/battlefield-backlines-discriminating.html . Ref: https://wodewangzhishime.blogspot.com/2021/11/httpswodewangzhishime_83.html?m=1 . . . Rotor resistance is used to safely "brake" a car. . The lower the Rotor resistance, the speed of maximum torque is higher. [ It is dangerous to brake a train which is moving forward at a high speed. . That mean, the rotor resistance of the reverse-moving motor must be high, otherwise, it is dangerous. . ] . The higher the Rotor resistance, the speed of maximum torque is lower. [ If a train is moving forward rapidly, the resistance of the "reverse-moving" must be high, otherwise, it is dangerous. . ] . Me: The above picture is divided into 2 parts. . Upper part is a motor which is moving forward. . The lower part is a motor which is braking. . . Note: Braking of a motor , means, a motor is moving reverse. . . Me: If a motor is moving forward rapidly, is it "safe" to let t...