| 摘要 |
<p>PURPOSE:To enable to simultaneously operate both an armature chopper and a field chopper in a weakening field zone by feeding back the difference between the actual conduction rate at an armature side and a set conduction rate to the conduction rate of the field chopper. CONSTITUTION:A necessary field magnetic flux phi is obtained from an armature chopper conduction rate alphaop to operate a normal armature chopper in a weakening field zone, a filter condenser voltage EC, and a motor speed N, and a filed current pattern IFC is outputted from necessary field magnetic flux phi. A field conduction rate gamma1 is outputted in response to the deviation between a field current pattern IFC and the actual field current IF. On the other hand, an armature current conduction rate alpha is outputted in response to the deviation between an armature current command and the actual armature current IA. Then, an integration compensation 27 is executed for the deviation between the conduction rate alpha and the set value alphaop, and the field condution rate gamma added with the conduction rate gamma2 and the conduction rate gamma1 obtained by limiting by a limiter 28 is obtained.</p> |
