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The powerplant generator considered in Problem $12\mathrm{.}52$ is rebuilt and moved to Europe. The rebuilt generator has two poles and the frequency of the electricity is $50$ Hz$.$ Redimension the bearings for minimum power loss and calculate the coefficient of friction, the side$-$leakage ratio, and the location of the terminating pressure. Let the eccentricity ratio be $0\mathrm{.}82$ to make sure that the bearings are dynamically stable. Calculate the power loss. Ans. hp $=11\mathrm{.}3$ kW

Problem $12\mathrm{.}52$ with Answers

A full journal bearing is used in a power plant generator in the United States; it has four poles and delivers electricity with $60-$Hz frequency. The rotor has a $25,000$ kg mass and is carried equally by two journal slider bearings. The shaft diameter is $300$ mm and each bearing is $300$ mm wide. The bearing and shaft surfaces are ground to a surface finish Ra $=1$m$.$ Dimension the bearings for minimum power loss and calculate the coefficient of friction, the side$-$leakage ratio, and the location of the terminating pressure to find where the oil feed groove can be placed. To ensure that the bearings are dynamically stable, choose an eccentricity ratio of $0\mathrm{.}82.$ Calculate the power loss in the bearing. Ans. $=0\mathrm{.}00195,$ c $=139$m$,$ hp $=6\mathrm{.}76$ kW