| 摘要 |
<p>In the case of DC-driven motors in the field of traction, for energy-saving reasons it is desirable to recover electrical energy when the vehicles are braking. In order to ensure both good driving operation and good braking operation, the braking resistor (R), the excitation winding (I) and the rotor winding (M) of a motor are arranged in mutually parallel load branches and are individually controlled by load-branch thyristors (Th1, Th2, Th5). A changeover device (H), which is common to all the load branches, is connected in series for controlling these thyristors and turning them off. This arrangement is particularly suitable for switching the motor over to the following operations phases: motor supply, field weakening of the motor rotor, resistance braking and regeneration braking, regeneration braking taking precedence over resistance braking. <IMAGE></p> |
