Proceedings ArticleDOI
Sensorless field orientation control of an induction machine by high frequency signal injection
Jung-Ik Ha,Seung-Ki Sul +1 more
- Vol. 1, Iss: 1, pp 426-432
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TLDR
In this article, the rotor flux angle was estimated from stator voltages and currents by injecting a high-frequency signal, which is not a rotating one but a fluctuating one at a reference frame rotating synchronously to the fundamental stator frequency.Abstract:
This paper describes a new scheme to find the rotor flux angle from stator voltages and currents by injecting a high-frequency signal. The signal is not a rotating one but a fluctuating one at a reference frame rotating synchronously to the fundamental stator frequency. When the estimated rotor flux angle coincides with the actual angle, the proposed method makes virtually no ripple torque, no vibration and less audible noise caused by the injected signal. The difference of impedances between the flux axis and the quadrature axis at high-frequency signal injection on the rotor flux angle is explained by the equivalent circuit equation of the induction machine. The difference is verified by experiments on test motors under various testing conditions. A sensorless field orientation algorithm is proposed and experimental results clarify the satisfactory operation of the algorithm with one hundred and fifty percent load torque at zero stator frequency.read more
Citations
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Journal ArticleDOI
Sensorless control of induction motor drives
TL;DR: The overview in this paper uses signal flow graphs of complex space vector quantities to provide an insightful description of the systems used in sensorless control of induction motors.
Journal ArticleDOI
High-Bandwidth Sensorless Algorithm for AC Machines Based on Square-Wave-Type Voltage Injection
TL;DR: In this paper, a square-wave-type voltage injection with signal processing was proposed to enhance the position estimation performance of a sensorless control system, and the performance of the current controller was enhanced up to 250 Hz and that of the speed controller was up to 50 Hz.
Proceedings ArticleDOI
Sensorless speed and position control of synchronous machines using alternating carrier injection
TL;DR: In this paper, the influence of the dead time effect on the carrier signal excitation comparing alternating and revolving injection principles is discussed, and an alternating injection procedure is proposed using a predefined injection angle.
Journal ArticleDOI
Initial rotor position estimation of an interior permanent-magnet synchronous machine using carrier-frequency injection methods
TL;DR: In this paper, a method using carrier-frequency injection to estimate the initial rotor position and magnetic polarity for an interior permanent-magnet synchronous machine was presented. But the model provided no information about the polarity of the rotor magnet because the position observer based on this model is locally stable at both poles.
Journal ArticleDOI
Hybrid rotor position observer for wide speed-range sensorless PM motor drives including zero speed
TL;DR: A hybrid structure integrating a flux observer and signal-injection techniques is proposed, which results in a rotor position signal independent of motor parameters at low and zero speed.
References
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Journal ArticleDOI
Direct self-control (DSC) of inverter-fed induction machine
TL;DR: Direct self-control (DSC) as discussed by the authors is a simple method of signal processing that gives converter-fed three-phase machines an excellent dynamic performance, and it is sufficient to process the measured signals of the stator currents and the total flux linkages only.
Journal ArticleDOI
Adaptive speed identification for vector control of induction motors without rotational transducers
TL;DR: A model-reference adaptive system (MRAS) for the estimation of induction motor speed from measured terminal voltages and currents is described, achieving moderate bandwidth speed control without the use of shaft-mounted transducers.
Proceedings ArticleDOI
Sensorless control of AC machines at low speed and standstill based on the "INFORM" method
TL;DR: In this paper, the authors present the "INFORM" method based on real-time inductance measurements for sensorless control of AC drives, which reduces robustness and increase costs of a drive considerably.
Journal ArticleDOI
Speed sensorless vector control of induction motor using extended Kalman filter
TL;DR: In this paper, an extended Kalman filter is employed to identify the speed of an induction motor and rotor flux based on the measured quantities such as stator currents and DC link voltage.
Journal ArticleDOI
Speed sensorless field orientation control of the induction machine
H. Tajima,Yoichi Hori +1 more
TL;DR: In this paper, a speed estimation method for an induction machine and its application to a flux observer-based field orientation (FOFO) control system is presented, where the motor speed is estimated on the basis of the difference between two flux estimators.
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