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#45 Perplexing Variable Frequency Drive Vibration …

Table 1, below, summarizes the key vibration amplitudes and frequencies. The dominant frequency was observed after the speed increased to that frequency. After the speed increased further, the dominant frequency remained and ...

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speeds below the no-load speed are required. As the supply voltage is normally constant, the voltage across the armature is varied by inserting a variable rheostat in series with the armature circuit. As controller resistance is 65 ...

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Oscillations I: Heavily Damped Oscillator

Can you construct a plausible scenario of a mass on a spring, all in molasses, to see why two very different rates of change of speed are possible? Hint: look again at the equation of motion of this damped oscillator. Notice that in ...

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NEMA Application Guide for AC Adjustable Speed …

Abstract - The application of AC adjustable speed drive systems has presented many unique challenges not only to electrical equipment manufacturers, but also to electrical equipment end users as well. In an effort to aid the ...