| 摘要 |
<p>A braking system for a vehicle powered by DC motor, such as a battery powered locomotive, is arranged to connect a bridging conductor (16) across the motor to brake the vehicle in an emergency. The system engages when the armature voltage of the motor reaches a predetermined threshold, and operates to disconnect the power supply to the motor, to reverse the series-connected field winding of the motor and to connect the bridging conductor (16) across the armature (A) and the field winding to brake the motor in an emergency. The resultant braking effect is self regulating.</p> |
