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Special features of the calculation of a controlled drive system with PM synchronous motor: PM synchronous motors are excited by permanent magnets. That means The basic differences to the control principles of other AC motors are due to the magnetic properties of permanent magnets, and particularly to the fact that Introduction. Permanent magnet synchronous motors (PMSM) are typically used for high-performance and high-efficiency motor drives. High-performance motor.Energy efficient PMSM are designed due to the availability of permanent magnet materials of high magnetic flux density. In synchronous motors the rotor rotates Some of the. PMSM rotors have the permanent magnets directly facing the air gap as in fig. 5.2. Rotor yoke is the magnetic portion of the rotor to provide a PDF | The paper presents different approaches of PMSM control strategies. Scalar control and vector control were chosen as possible methods for AC.