Referring to the sensorless control of interior permanent magnet synchronous motor (IPMSM), initial rotor polarity is normally estimated based on saturation effect. However, for certain special IPMSMs, effect weak even at rated point, making saturation-based detection methods invalid. Therefore, this paper proposes a novel method torque-pulse injection. Two current pulses are imposed positive a...

Theory and experiment for dc and small-signal electrical modulation of an injection-locked quantum-well (QW) Fabry-Perot laser are presented. Our experiment is realized by performing side-mode injection locking of a multiple-quantum-well (MQW) InGaAsP FabryPerot (FP) laser, which has the advantage of optical wavelength conversion. We first measure the dc characteristics and optical spectra of a...

A well-designed free-running oscillator provides a periodic signal of constant amplitude and frequency fo from the energy delivered by direct-current (dc) sources. This has an immediate application for the realization of local oscillators used in the frequency-conversion stages of communication systems [1]. In receivers, the modulated signal at radio-frequency (RF) fRF is mixed with the output ...

The growing interest of miniaturized power converters has pushed the development high frequency inductors integrated in Power Supply on Chip or Package. proper characterization inductor impedance is a challenge due to dependence current, quality factor (Q) and range where these devices operate. In this paper, we present comparison different measuring methods characterize Q inductors. based syst...

Traditional noise removal methods like Non-Local Means create spurious boundaries inside regular zones. Visushrink removes too many coefficients and yields recovered images that are overly smoothed. In Bayesshrink method, sharp features are preserved. However, PSNR (Peak Signal-to-Noise Ratio) is considerably low. BLS-GSM generates some discontinuous information during the course of denoising a...