Soft Startup Technology of AC Asynchronous Motor

The current of three-phase asynchronous motor direct startup will reach 5-8 times of its rated current, causing the decrease of operation efficiency and its PFC, even great damage to the trailer system and the grid. Soft start technology can start as shockless and fluent as possible and then reach its best status of startup and pause by adjusting the parameters. This report mainly introduces deficiency of several traditional startup methods widely used in modern industries. And several motor soft start methods are compared based on recent domestic and abroad research results.