| 摘要 |
<p>The braking circuit, for a synchronous machine, short circuits the armature winding after the machine has been disconnected from the mains supply or switches in braking resistors. After a braking resistor has been switched in, the pole windings of the exciter are connected into a configuration producing excitation independent of speed. The excitation (E) is switched off at the latest when the resistor (W) is connected in parallel with the supply points of the speed-independent excitation (H,BG). The resistor (W) is voltage dependent and is used for de-excitation. The pole winding circuits remain closed whilst braking proceeds independently of the exciter's output. If an excitation machine is used it does not need to be constantly connected to the pole windings.</p> |
