The variable speed systems now used in crank presses have problems such as narrow in variable speed, fault in low speed and failure in tiny adjustment and so on. 目前曲柄压力机调速系统存在调速范围窄、低速故障、微调死机等问题。
Cause Analysis on Low Oil Pressure for Speed Adjustment of No.2 Unit In Songshan Fossil-fired Power Plant 松山火力发电厂2号机调速油压低原因分析
Flux linkage locus method is to make flux linkage locus approach a circle through direct control of asynchronous motor flux linkage, specially at low frequency, so that low noise, no low frequency torque ripple and constant flux speed adjustment characteristics can be obtained. 磁通轨迹法是通过对异步机磁链的直接控制,使其轨迹近似为园,尤其在低频时轨迹更近似为园,从而使系统噪声小、无低频转矩脉动现象、具有恒磁通调速特性。
Low speed wind tunnel experiment requires strict of the wind speed, which requires a wild range of wind speed, high precision, and quick adjustment. 低速风洞实验要求对实验段的风速有严格的控制,要求风速调节范围宽,精度指标高,调节速度快。