| 摘要 |
PURPOSE:To facilitate the parallel operation of inverters without producing a circulating current and realize a large capacity by a method wherein a plurality of 3-phase winding whose number is a measure of the number of poles of a motor are provided in parallel with each other and power is supllied to the respective 3-phase windings from a plurality of inverters. CONSTITUTION:Even if parallel circuits are made to be independent from each other to provide 2 sets of the 3-phase windings and same phase voltages or currents are applied to the respective windings, the electrical characteristics of a rotary machine are not changed. If respective inverters are connected to the individual windings directly, the currents of the inverters INV1 and INV2 are halved, so that a large capacity can be realized. That is, if the number of poles of an induction motor is (n), (n) sets of 3-phase windings, for instance, are provided in parallel with each other and (n) inverters INV1-INVn are connected to the (n) 3-phase windings in series respectively and a plurality of the inverters INV1-INVn are operated in parallel. With this constitution, the parallel operation of the inverters INV1-INVn can be performed without additional apparatuses such as a transformer and a reactor and a large capacity can be realized. |
