電流 current; galvanic current; electric current; electricity; current flow◇電流保護裝置 current protective device; 電流飽和 current saturation; 電流倍增 current multiplication; 電流測量 current measurement; 電流測量儀表 current instruments; 電流差動 current differential; 電流常數 current constant; 電流斷路器 tie [line] breaker; 電流方向 sense of current; 電流放大器 current amplifier; 電流分配 current division; 電流消耗 current drain; 電流效率 current efficiency; 電流效率測定法 current efficiency determination method; mination method; 電流諧振 current resonance; 電流選擇開關 current selected switch; 電流指示器 current indicator
Theoretical analysis on electromagnetic separation of inclusions from molten metal only by current 金屬液單電流電磁凈化的理論分析
In the design of real - time control system , the paper takes three - phase full - bridge mosfet inverter as the real - time control main circuit , and adopts a control scheme with 120 ? switching mode combined with half - bridge pulse width modulation ( pwm ) , which would avoid straightthrough short of a certain bridge . phase current is detected by single current sensor ; three - phase position signals generated by position sensors could not only supply commutation information for inverter , but also be used for speed detecting based on signals " period measurement , which makes the speed sensor unnecessary . the whole control system adopts speed and current dual closed - loop control strategy in order to construct a high performance rare - earth permanent magnetic brushless dc motor ( repm bldcm ) full - digital real - time control system 在實時控制系統的設計中,本文以三相全橋mosfet逆變電路作為實時控制主電路,采用120導通方式結合半橋pwm調制的控制方案,從而有效地避免了橋臂的直通短路;本文用單電流傳感器實現對相電流的檢測,來自位置傳感器的三相位置信號不僅為逆變電路提供換相信息,而且也用于基于信號周期測量的轉速檢測,這樣就省去了速度傳感器;系統采用的是速度、電流雙閉環控制策略,力求構建高性能的稀土永磁無刷直流電動機全數字實時控制系統。