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Current derivative based sensorless control methods, which falls under saliency tracking technique, is a promising new sensorless control methods for AC machines over a wide speed range, including zero speed. This method requires accurate current derivative measurement under different applied PWM voltage vectors. The accuracy of current derivative is affected by the high frequency oscillations which...
This paper proposes a simplified Fundamental PWM Excitation (FPE) sensorless control method on IPMSMS direct torque control drives. This method is based on a five-segment PWM and the measurement of two active voltage vectors and one zero voltage vector during the first half of each PWM modulation cycle in order to obtain di/dts and estimate the rotor position therefrom. Compared to the conventional...
This paper proposes a sensorless control technique for an Interior Permanent Magnet Synchronous Motor (IPMSM) based on the fundamental Pulse Width Modulation (PWM) excitation over a wide speed range. The method employs the measurement of the current derivatives at one inactive voltage vector and one active voltage vector during each PWM cycle. The rotor position and speed is estimated at PWM frequency...
The Fundamental PWM Excitation (FPE) is a recent sensorless motor control method in the electrical drive system which uses the current derivative measurement to estimate the rotor position. However, parasitic effects arising from the IGBT switches cause high frequency oscillation in current, so the current derivative estimation cannot be made until these high frequency oscillations die down. In this...
This paper proposes a sensorless control technique for an Interior Permanent Magnet Synchronous Motor (IPMSM) based on the measurement of current derivative. The rotor speed and position are estimated based on measurement of current derivatives at one zero voltage space vector and one active voltage space vector during each PWM cycle. The proposed method is different from the fundamental pulse-width...
This paper proposes a new high-bandwidth speed sensorless field orientated control system for interior permanent magnet synchronous motor drives for wide speed range operation, including standstill. The sliding mode observer is used for joint stator flux and rotor speed estimation at all speeds. At low speeds, the flux vector estimate of the observer is enhanced by the fundamental PWM excitation technique...
This paper first extend the Fundamental PWM Excitation (FPE) sensorless control technique on Interior Permanent Magnet Synchronous Machine (IPMSM) and investigates the torque control bandwidth of three sensorless control schemes for Direct Torque and Flux Control (DTFC) for IPMSMs, including High Frequency (HF) Injection, Adaptive Sliding Mode Observer (SMO) and FPE. Through the frequency response...
This paper proposes a new high-bandwidth speed sensorless direct torque control of interior permanent magnet synchronous motor drives for wide speed range operation, including standstill. The sliding mode observer is used for joint stator flux and rotor speed estimation at all speeds. At low speeds, the sliding mode observer is enhanced by the fundamental PWM excitation technique, which is used to...
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