| 摘要 |
PROBLEM TO BE SOLVED: To suppress obstruction caused by a common mode current by reducing current capacity of each noise filter. SOLUTION: Noise filters 16, 18, and 20 are inserted between an inverter 14 for converting the DC output of a rectifier 12 to a three-phase AC and a motor 12, one end of each of the noise filters 16, 18, and 20 is connected to each three-phase AC terminal of the inverter 14, and the other is connected to a motor 22. Three of noise filters 16 to 20 are connected to the output side of the inverter 14 in parallel, thus dividing the common mode current being generated from the inverter 14 by each noise filter, reducing current flowing in the noise filters 16 to 20 to 1/3, avoiding magnetic saturation, and at the same time reducing the size and weight of the noise filters 16 to 20. |
