| 摘要 |
<p>PURPOSE:To increase the regenerative brake rate by stopping a chopper operation by detecting a plugging state, forming a regenerative circuit by waiting the reduction in the generating current of a motor and then preliminarily exciting to perform a regenerative operation. CONSTITUTION:Contactors 2A, 3A are switched complementarily reversely at a plugging time to flow a plugging current to an armature 1. When the current of a diode 10 or 11 is a constant value or higher and continued for one period or longer of a chopper main circuit, a flip-flop 18 is set, and a chopper stopping circuit 19 suppresses the operation of a chopper controller. On the other hand, after the setting time of a timer 20 is elapsed, a flip-flop 21 is set, and a regenerative switching electromagnetic contactor 7 is controlled OFF. When a regenerative state detector 25 detects the separation of a contactor 7A, a regenerative brake by the chopper operation is started.</p> |
