Minimum duty cycle

The nearest standard rating to this is 7.5 kW, and a motor of this rating will suit the duty cycle. To ensure that it can also meet the torque requirement of 10.5 kW, it should have a minimum pull-out torque of 10.5/7.5 or 140% with the slip at this point as low as possible so that when operating at 140%... 

Since fhere cannof be fracfonal furns on an E-E core, round fhis up fo 5.0 furns. This will yield a maximum duty cycle at the minimum input voltage of... 

Figure 12-9 Minimum and Maximum and Minimum Input Voltages Possible for a Buck, Based on Minimum On-time and Minimum Off-time (Or Corresponding Duty Cycles)...

A tabulation of prices and ratings would lead one to the proper motor selection. The motor should be sized to operate at high efficiency over the anticipated duty cycle. This allows for a minimum power factor correction. In the low duty part of the cycle, a smaller motor Is more efficient. It Is strongly recommended that the power factor correction be used to make the motor operate at Its peak efficiency over the total cycle. Buyers have a tendency to overspecify the required HP which results In less than peak efficiency. 

Combination of a pulsed bias and noncontact AFM has been found to improve the control of the writing process [78]. This method reduces the tip-substrate interaction time and thus improves the reliability and lithographic resolution. The frequency of oscillation and the field pulsing frequencies need to be adjusted to create a definite phase relation between the two and it was found that the minimum line width is obtained when the applied field is on during the time the cantilever tip is furthest from the substrate. The process also needs adjustment of the duty cycle. 

We are ignoring the voltage ripple on the input terminals of the converter, and therefore we will take this as the dc input to the converter stage. So the duty cycle at minimum input voltage is... 

Answer As mentioned in Chapter 1, it is generally hard to predict the overall effect of temperature on a power-supply s efficiency, and thereby on its duty cycle variation with respect to temperature. Some loss terms increase with temperature and some decrease. However to be conservative, we should at a minimum account for the increase in the forward... 

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