This paper concerns the realization of a sensorless permanent magnet (PM) synchronous motor drive. Position and angular speed of the rotor are obtained through an extended Kalman filter. The estimation algorithm does not require either the knowledge of the mechanical parameters or the initial rotor position, overcoming two of the main drawbacks of other estimation techniques. The drive also incorporates a digital d-q current control, which can be easily tuned with locked rotor. The experimental setup includes a PM synchronous motor, a pulsewidth modulation voltage-source inverter, and floating-point digital-signal-processor-based control syste

No abstract

In a research field of network-based control systems (NBCSs), the time delay problem is one of the most significant is- sues. Efficient stabilization methods of time delayed control sys- tems enable NBCSs to be flexibly applied to many kinds of situa- tions. A novel time delay compensation method based on the con- cept of network disturbance (ND) and communication disturbance observer (CDOB) has been proposed. The compensation method has the same effectiveness as that of the Smith predictor. In addi- tion, since the method is simple and does not need time delay model or time delay measurement, it can be easily implemented to various applications. However, the design method has not been concerned so far. This paper therefore presents stability analysis and studies a practical design procedure of the time delayed control systems with CDOB. At first, the concept of ND is introduced and the validity of the time delay compensation method is described. Then an analysis about the effects of parameters in control systems on stability is conducted. Characteristics of the effects of parameters on stability come out. Then we study a practical design procedure of the time delayed control systems. The validity of the design procedure is val- idated by experimental results. In the experiment, we also verify the performance of the system in the case of time-varying delay. Finally, comparative study of the method to the Smith predictor is presented

This paper presents the research on tactile sensing\ud system on chip. The tactile sensing chips comprise of 5 5 array\ud of Piezoelectric Oxide Semiconductor Field Effect Transistor\ud (POSFET) devices and temperature sensors. The POSFET devices\ud are obtained by spin coating piezoelectric polymer, poly(vinylidene\ud fluoride-trifluoroethylene) (P(VDF-TrFE)), films directly on to the\ud gate area of Metal Oxide Semiconductor (MOS) transistors. The\ud tactile sensing chips are able to measure dynamic contact forces\ud and temperatures. The readout and the data acquisition system\ud to acquire the tactile signals are also presented. The chips have\ud been extensively tested over wide range of dynamic contact forces\ud and temperatures and the experimental results are presented.\ud The paper also reports the research on tactile sensing chips with\ud POSFET array and the integrated electronics