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A Study on Performance Improvement of Position Sensorless 120-degree Conduction Drive for Small IPMSMs

The electric home appliances driven by the battery require high efficiency, low cost, small size and lightweight drive system. And the simple position sensorless control system using Interior Permanent Magnet Synchronous Motor (IPMSM) is also needed. This research aims at expanding startable load condition and enhancing efficiency characteristics of the position sensorless drive for small IPMSMs that operated in the 120-degree conductive drive.