| 摘要 |
<p>PURPOSE:To accelerate the rise of a brake by rising all fields at brake starting time, and returning to a field-weakening under the condition that a current rises to a predetermined value. CONSTITUTION:When a master controller MC is advanced to a brake B1 position, the coil BL1-C of a breaker is energized to close a main contact BL1, and brake currents rise in all fields. When the brake currents arrive at a predetermined value, a brake current detector CD operates to close the contact CDR-a. Thus, the coil WFL-C of a field-weakening closing breaker is energized to close the main contact WFL to become a field weakening state. When the controller MC is sequentially advanced to positions B2, B3, the contacts BL2, BL3 are successively closed.</p> |
