
pub3241bvariablefrequencydrives
... test results. Do not perform an insulation test with a VFD connected to the test unit, because the high voltage used in an insulation test can damage a VFD. In some cases, a motor should be rebuilt before being put into service with a variable frequency drive. In addition, the manufacturers of the m ...
... test results. Do not perform an insulation test with a VFD connected to the test unit, because the high voltage used in an insulation test can damage a VFD. In some cases, a motor should be rebuilt before being put into service with a variable frequency drive. In addition, the manufacturers of the m ...
Amplitude and Angle Modulation
... inductively coupled to the tank circuit. At resonant frequency or radio band frequency range maximum signal is fed to the base of transistor since at resonance circuit offers less impedance and impedance is totally resistive. Components CB and RB maintain the transistor in class C mode. We know that ...
... inductively coupled to the tank circuit. At resonant frequency or radio band frequency range maximum signal is fed to the base of transistor since at resonance circuit offers less impedance and impedance is totally resistive. Components CB and RB maintain the transistor in class C mode. We know that ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... Minimization Of Total Harmonic Distortion Using Pulse Width Modulation Technique A triangular signal performs forced oscillation in a definite window. Comparators are required to compare the reference and carrier waves. A circuit provided in figure 1.4 can generate the delta modulated gate signal. ...
... Minimization Of Total Harmonic Distortion Using Pulse Width Modulation Technique A triangular signal performs forced oscillation in a definite window. Comparators are required to compare the reference and carrier waves. A circuit provided in figure 1.4 can generate the delta modulated gate signal. ...
Y21136149
... The power quality (PQ) characteristics fall into two major categories: steady-state PQ variations and disturbances. The steady-state PQ characteristics of the supply voltage include frequency variations, voltage variations, voltage fluctuations, unbalance in the three-phase voltages, and flicker in ...
... The power quality (PQ) characteristics fall into two major categories: steady-state PQ variations and disturbances. The steady-state PQ characteristics of the supply voltage include frequency variations, voltage variations, voltage fluctuations, unbalance in the three-phase voltages, and flicker in ...
Chirp spectrum

The spectrum of a chirp pulse describes its characteristics in terms of its frequency components. This frequency-domain representation is an alternative to the more familiar time-domain waveform, and the two versions are mathematically related by the Fourier transform. The spectrum is of particular interest when pulses are subject to signal processing. For example, when a chirp pulse is compressed by its matched filter, the resulting waveform contains not only a main narrow pulse but, also, a variety of unwanted artifacts many of which are directly attributable to features in the chirp's spectral characteristics. The simplest way to derive the spectrum of a chirp, now computers are widely available, is to sample the time-domain waveform at a frequency well above the Nyquist limit and call up an FFT algorithm to obtain the desired result. As this approach was not an option for the early designers, they resorted to analytic analysis, where possible, or to graphical or approximation methods, otherwise. These early methods still remain helpful, however, as they give additional insight into the behavior and properties of chirps.