Two different nonlinear dynamic control algorithms are presented for synchronous motors with damping windings: (i) an adaptive speed-sensorless controller for rotor position tracking in the presence of unknown constant load torque, on the basis of rotor angle, stator and field windings currents measurements; (ii) an adaptive control law for rotor speed tracking in the presence of uncertain cons...

More and more the predictive maintenance of high power equipment is employed to contribute to its sustainable and economic operation. Partial discharge (PD) measurements are for this increasingly used for on-line and off-line condition assessment of rotating machines in the power generation, industrial drive application and traction. However, the main difficulties with the interpretation of PD ...

The article describes the design of the White Rabbit PTP Core (WRPC) – an easy-to-use HDL module implementing an IEEE1588-v2 synchronization model extended with the White Rabbit (WR) protocol. The WRPC can provide sub-nanosecond timing in standard FPGA-based designs or enhance the accuracy of existing systems through OEM modules. WRPC delivers the time and frequency reference via a common timin...

We study the problem of guaranteeing synchronous message deadlines in token ring networks where the timed token medium access control protocol is employed. Synchronous bandwidth, defined as the maximum time for which a node can transmit its synchronous messages every time it receives the token, is a key parameter in the control of synchronous message transmission. To ensure the transmission of ...

Globally Asynchronous Locally Synchronous (GALS) Systems have provoked renewed interest over recent years as they have the potential to combine the benefits of asynchronous and synchronous design paradigms. It has been applied to ASICs, but not yet applied to FPGAs. In this paper we propose applying GALS techniques to FPGAs in order to overcome the limitation on timing imposed by slow routing.

1. Introduction During recent years the speed-gradient algorithms developed in control engineering area [1,2] have been applied intensively to control of oscillatory motion and particularly to control of vibration units. Among problems solved by speed-gradient approach are control of vibration units in start-up modes (swing-up and passage through resonance) [ 3-5], synchronization [6-8], etc. O...

In this paper, an irradiance-based absolute radiometric calibration campaign at Baotou site during June and July 2018 was described. This made use of six tarps. The synchronous measurements parameters such as surface reflectance, atmospheric parameters, diffuse-to-global irradiance ratio were collected the satellite overpass. top-of-atmospheric radiance predicted by radiative transfer model wit...

For code-division multiple-access (CDMA) cellular communications synchronous operation offers significant advantages over asynchronous operation. This feature has been already included in second-generation systems, such as the CdmaOne based on the IS-95 standard. Nonetheless, synchronous operation does not seem to be assessed as a basic system option for third-generation systems. This is mainly...

‎in this paper, we investigate the chaotic behaviors of the fractional-order permanent magnet synchronous motor (pmsm) system. the necessary condition for the existence of chaos in the fractional-order pmsm system is deduced and an active controller is developed based on the stability theory for fractional systems. the presented control scheme  is simple and flexible, and it is suitable both fo...

this paper presents a novel control method to improve the efficiency of low-voltage dc-dc converters at light loads. pulse width modulation (pwm) converters have poor efficiencies at light loads, while pulse frequency modulation (pfm) control is more efficient for the same cases. switching losses constitute a major portion of the total power loss at light loads. to decrease the switching losses...