| 摘要 |
Each supply phase (u, v, w) is provided with a current sensor (Cu, etc.) whose output is applied to a standardizing interface (C1) as a voltage proportional to the phase current. The interface produces output currents (Inu, etc.), proportional to the ratio of the phase currents (Im) to a reference current (Ir), which are passed by current mirror to a summation unit (C2) producing a DC output voltage (Vr) proportional to the sum of the standardized currents. A calculating unit (C3) processes this signal and the resultant chopped current, an image of the summated standardized currents, is passed to the modeling circuit (C4). The capacitor in this is prevented from discharging into the calculating unit by a diode, and the modeling unit controls the motor switchgear (C5). |
