| 摘要 |
PURPOSE:To improve a current balance by detecting an unbalanced current between two inverters and by making the width of a driving signal of the inverter bridge of a smaller current larger than the width of a driving signal of the inverter bridge of a larger current. CONSTITUTION:The outputs of inverters 2, 3 respectively corresponding to two winding coils wound and insulated around the same slot of an AC motor are connected with said two winding coils and current sensors 64a, 64b are added thereto. Further, a differential amplifier 65, level detectors 66, 67 and pulse duration variable circuits 60-63 are provided, and a driving circuit is divided into respectively two driving circuits 12a, 12b and 13a, 13b for each bridge. Said differential amplifier 65 detects a difference i between output currents i1, i2 of two inverter bridges, amplifiers said difference to a suitable level and sends it to said level detectors 66, 67. |
