Sensorless control of induction motor drives
Joachim Holtz
- Vol. 90, Iss: 8, pp 1359-1394
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TLDR
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.Abstract:
Controlled induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. To replace the sensor the information on the rotor speed is extracted from measured stator voltages and currents at the motor terminals. Vector-controlled drives require estimating the magnitude and spatial orientation of the fundamental magnetic flux waves in the stator or in the rotor. Open-loop estimators or closed-loop observers are used for this purpose. They differ with respect to accuracy, robustness, and sensitivity against model parameter variations. Dynamic performance and steady-state speed accuracy in the low-speed range can be achieved by exploiting parasitic effects of the machine. 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.read more
Citations
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Journal ArticleDOI
Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification
Joachim Holtz,Juntao Quan +1 more
TL;DR: In this paper, a pure integrator is employed for stator flux estimation, which permits high estimation bandwidth and compensates the offset and drift components in the acquired feedback signals, voltage distortions caused by the nonlinear behavior of the switching converter and increased sensitivity against model parameter mismatch.
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.
Journal ArticleDOI
Controlled AC Electrical Drives
John W. Finch,Damian Giaouris +1 more
TL;DR: Control techniques which are being applied to make AC drives a rapidly growing area are discussed, with concentration on recent trends suitable for practical applications in the industry with good dynamic behavior.
Journal ArticleDOI
Drift and parameter compensated flux estimator for persistent zero stator frequency operation of sensorless controlled induction motors
Joachim Holtz,Juntao Quan +1 more
TL;DR: In this article, a pure integrator is employed for stator flux estimation and the time-variable DC offset voltage is estimated from the flux drift in a parallel stator model and used to eliminate the offset by feedforward control.
Journal ArticleDOI
Cross-Saturation Effects in IPM Motors and Related Impact on Sensorless Control
TL;DR: Permanent-magnet-assisted synchronous reluctance motors are well suited to zero-speed sensorless control because of their inherently salient behavior but the cross-saturation effect can lead to large errors on the position estimate, which is based on the differential anisotropy.
References
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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.
Journal ArticleDOI
Pulsewidth modulation for electronic power conversion
TL;DR: In this paper, the authors present a detailed overview of the switching functions used in power converters, ranging from simple averaging schemes to involved methods of real-time optimization, which can be found in the literature.
Journal ArticleDOI
DSP-based speed adaptive flux observer of induction motor
TL;DR: In this paper, a method for estimating the rotor flux and speed of an induction motor based on adaptive control theory is presented, which is applied to a direct field-oriented induction motor control without speed sensors.
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.