A CONTROL METHOD FOR SENSORLESS PERMANENT MAGNET SYNCHRONOUS MOTOR

摘要

A method for controlling a sensorless PMSM(Permanent Magnet Synchronous Motor) is provided to prevent vibration from being generated when the sensorless PMSM rotates at a speed lower than a rated rotation speed. A method for controlling a sensorless PMSM(M) includes the steps of: synchronously starting two or more sensorless permanent magnet synchronous motors at a low rotation speed by applying a very low-frequency three-phase alternating current to the two or more sensorless permanent magnet synchronous motors from a single inverter for a predetermined time; and allowing the two or more sensorless permanent magnet synchronous motors to reach at rated rotation speed through by gradually increasing a frequency of power(G) to increase a rotation speed of the two or more sensorless PMSMs.