Patent ID: 6642681
Filing Date: 2003-11-04
Classification: H02P

Abstract:
A synchronous-motor starting method using an inverter which has a direct-current power supply and a power output means for supplying stator coils of multiple phases with power based on a direct-current voltage, and is designed to change power supply phases and drive a synchronous motor,wherein the synchronous-motor starting method is characterized in that a first power supply pattern, a second power supply pattern, and a third power supply pattern are provided as three successive startup power supply patterns, and in that when the power supply period corresponding to said first power supply pattern, the power supply period corresponding to said second power supply pattern, and the power supply period corresponding to said third power supply pattern are taken as T1, T2, and T3, respectively, these periods are maintained in the relationship of T1>T3&gE;T2&gE;0.