Abstract
High-frequency voltage or current injection based self-sensing has been used to control motors at zero and low-speed operations. Tracking the motor back EMF or flux signal has been used to control motors during medium and high-speed operations. This paper proposes a high-frequency flux injection (HFFI) based self-sensing using deadbeat-direct torque and flux control (DB-DTFC) to control permanent magnet servo motor at zero and low speed with ideally zero torque ripple, not like the current/voltage injection technique. The HFFI is combined with a back EMF self-sensing technique to control the motor during medium and high-speed operations. This paper also proposes a method for a smooth transition between these two methods. The proposed controller is used to control a servo motor during dynamic servo operations.
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