The invention discloses an electric soft braking method of subway locomotive, which is characterized by the following: when the locomotive draws controller to send braking order, the electric driving device breaks output, the electric working condition of DC drawing motor is transmitted into generating working condition, the pressure on two ends of large-capacity stable pressure capacitance is elevated rapidly, when the pressure reaches 1500V, the locomotive enters braking stage, the soft braking controller regenerates soft braking switch to realize soft starting, which feeds electricity to 1500V DC electrified wire netting through large-power feed diode, when the pressure is less than 1500V, the locomotive enters consumption braking stage, the soft braking controller controls to realize soft starting, which discharges the consumption load circuit. |