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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...
The estimation accuracy of the stator flux and speed using open-loop integrators drops as the mechanical speed reduces in direct-torque-controlled (DTC) interior-permanent-magnet (IPM) synchronous motors. At lower speed, inaccurately estimated stator flux and stator resistance mismatch have significant influence on the steady-state and transient performance of the drive system. The robustness against...
This paper investigates the modulation and control of a new bidirectional converter for 42V ISA system. The modulation for both rectifier and inverter is derived from the indirect space vector modulation algorithm for AC/AC matrix converter. The proposed bidirectional AC/DC power converter combines the advantages of matrix converter and Z-source inverter. The closed-loop control of input displacement...
A new sensorless direct torque control scheme for matrix converter-fed interior permanent magnet synchronous machine is investigated in this paper. Comparing to the classical DTC, the proposed scheme features in low ripples in torque and flux, fixed switching frequency and unity input power factor. Moreover, it significantly reduces the harmonics in the input current even with a small input filter...
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