Publicaties
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High Speed MRAM with Voltage Control of Magnetic Anisotropy (VCMA) Effect KU Leuven
Magnetic random access memory (MRAM) is gaining intensive interest for embedded and stand-alone memory applications. Its inherent non-volatility is believed to address the large stand-by energy consumption issues in the present memory hierarchy. In recent years, the spin-transfer torque (STT)-MRAM has gradually matured and started to appear in the market. Typically, STT writing of perpendicular magnetic tunnel junction (pMTJ) is limited to a few ...
Optimal dynamic induction and yaw control of wind farms: effects of turbine spacing and layout KU Leuven
© Published under licence by IOP Publishing Ltd. Turbine wake interactions in wind farms result in decreased power extraction in downstream rows. This work investigates dynamic induction and yaw control of wind farms for increased total power extraction. Six different wind farm layouts are considered, and the relative benefits of induction control, yaw control, and combined induction-yaw control are compared. It is found that optimal control ...
Uni- and bidirectional rotation and speed control in chiral photonic micromotors powered by light Universiteit Gent
Liquid crystalline polymers are attractive materials for untethered minia- ture soft robots. When they contain azo dyes, they acquire light-responsive actuation properties. However, the manipulation of such photoresponsive polymers at the micrometer scale remains largely unexplored. Here, uni- and bidirectional rotation and speed control of polymerized azo-containing chiral liquid crystalline photonic microparticles powered by light is reported. ...
Adaptive control of compliant robots with Reservoir Computing Universiteit Gent
In modern society, robots are increasingly used to handle dangerous, repetitive and/or heavy tasks with high precision. Because of the nature of the tasks, either being dangerous, high precision or simply repetitive, robots are usually constructed with high torque motors and sturdy materials, that makes them dangerous for humans to handle. In a car-manufacturing company, for example, a large cage is placed around the robotU+2019s workspace that ...
Predictive current control of asynchronous machines by optimizing the switching moments Universiteit Gent
In this paper a model-based predictive control (MBPC) scheme for the current control of induction machines is presented. The controller directly selects the optimal switch state of the inverter. The proposed scheme uses a longer prediction horizon and a limited amount of optimal switching instants to reduce the average switching frequency. The next iteration of the MBPC-scheme is performed at the established optimal switching instant, as such ...
A new Closed Loop Speed Control of Induction Motor Fed by High Performance Z-Source Inverter Vrije Universiteit Brussel
This paper proposes a new closed loop speed control of induction motor fed by a high performance Z-source inverter (ZSI), the speed control is based on V/F and indirect field-oriented control strategies (IFOC). The indirect field-oriented control based on PWM voltage modulation with voltage decoupling compensation is used to insert the shoot-through state within the switching signals. A dual loop controller is designed to control the peak dc ...
Control of a Bidirectional Z-Source Inverter for Electric Vehicle Applications in Different Operation Modes Vrije Universiteit Brussel
This paper proposes two control strategies for the bidirectional Z-source inverter (BZSI) supplied by a battery for electric vehicle applications. The first control strategy utilizes the indirect field-oriented control (IFOC) method to control the induction motor speed. The proposed speed control strategy is able to control the motor speed from zero to the rated speed with the rated load torque in motoring and regenerative braking modes. The ...
PMSM Drive Current and Voltage Limiting as a Constraint Optimal Control Problem KU Leuven
© 2014 IEEE. This paper proposes an algorithm for optimal current trajectory control of (interior) permanent magnet synchronous motor (PMSM) drives, considering the motor/inverter current and voltage limitations. In contrast to common voltage feedback flux-weakening strategies, it applies a differential rather than a conventional integral approach to regulate the current vector. Linearized motor equations are used to express torque and voltage ...
Experimental Evaluation of a Stiffness-Fault-Tolerant Control Strategy on an Elastic Actuator for Wearable Robotics Vrije Universiteit Brussel
Elastic actuator design is primarily motivated by safety in
human-robot interaction and energy efficiency. However, the
increased complexity when compared to direct drives, makes
the system prone to technical faults in elastic and
kinematic elements. On the other hand, Variable Stiffness
Actuators (VSA) often introduce non-linear
torque-deformation relationships. We propose a
stiffness-fault-tolerant control ...
human-robot interaction and energy efficiency. However, the
increased complexity when compared to direct drives, makes
the system prone to technical faults in elastic and
kinematic elements. On the other hand, Variable Stiffness
Actuators (VSA) often introduce non-linear
torque-deformation relationships. We propose a
stiffness-fault-tolerant control ...