Expansion of Field-Oriented Control Operation Range of Dual Three-Phase Synchronous Motor with Flux Weakening Control in the Inverter Overmodulation Region

As the theories for expanding the operation range, the inverter overmodulation strategy and the flux weakening control method are widely used on the three-phase motors. In conventional research, it was found that a dual three-phase motor can be field-oriented-controlled in the overmodulation region easier than a three-phase motor. In this study, the theory of utilizing the flux weakening control and inverter overmodulation together for Dual Three-Phase Synchronous Motor is proposed, and the current reference calculation method under the flux weakening control is presented. The expansion performance of the proposed field-oriented control operation range is evaluated.