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Electrons ow from the anode to the cathode in the metal wires of an electrical circuit In the electrolyte of a battery there is a ow, in opposite directions, of both positively and negatively charged atoms, or ions The ion ow inside the electrolyte must exactly match the electron ow outside the battery through the load In fact, the internal resistance of the battery to the ionic ow is an important factor in how much energy the battery can provide at a given time The terms anode and cathode can be confusing, because they seem to mean di erent things when applied to batteries versus other components The cathode is the negative side of a two-wire component such as a resistor, but it is the positive terminal of the battery Both de nitions are correct The anode is, formally, the terminal or electrode where electrons leave a system.



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In cases when a certain amount of information is not available, Table 66 can serve as a guide for the design life of the bearing Table 66 Representative bearing design life [13]

In a current source like a battery or generator the anode is the negative terminal because electrons are being pushed out from it But in an energy-consuming component it is the positive terminal, since the electrons are being pulled out of the component by the positive charge on that side Conversely, the cathode is positive on a battery yet negative on a passive component When electrons leave a battery they enter a component so the anode (electron source) of the battery is connected to the cathode (electron sink) of a component..

Types of Application Design Life (thousands of hours) 01 05 4 8 8 14 14 20 20 30 50 60 100 200





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Machines used intermittently, where service interruption is of minor importance Machines used intermittently, where reliability is of great importance Machines for an 8-hour service, but not every day Machines for an 8-hour service, every working day Machines for a continuous 24-hour service Machines for a continuous 24-hour service where reliability is of great importance

Electric charges move very slowly through your wires, slow like the minute hand on a clock is slow. And yet, when you turn on a light switch, the power reaches the bulb at, roughly, the speed of light.

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Example: Ball Bearing Selection Select a suitable ball bearing (radial ball bearing with a = 0 or an angular ball bearing with a = 25 ) based on the required rated capacity, Creq, using the following information [5]: Continuous operation of eight hours per day Rotation speed of 1800 RPM Radial load, Fr, = 12 kN Thrust load, Ft, = 15 kN Light to moderate impact Required reliability is 90% Kr = 1 (Figure 615) LR = 90 106 Ka = 15 (Figure 616) Lrev = 30,000 hours 1800 rpm 60 min/hour = 3240 106 revolutions For radial ball bearings: Fig 614: Illustration for selection of ball bearings [5] Ft/Fr = 125

The electrons in your wire don t move fast, but they move together. Here is another electrical analogy, the clothesline. Take two pulleys and anchor them on two di erent sides of your yard. Wrap a rope into a circle, through these pulleys. When you pull the rope on one side of the yard, the pulley on the other side feels the force instantly. The rope itself is moving slowly, but the power is transmitted by the rope quickly.

Rolling Element, Hydrodynamic and Hydrostatic Bearings For angular contact ball bearings (a = 25 ): Ft/Fr = 125

From most manufacturers catalogues and according to the values of Creq, the choice is either deep groove ball bearings or angular contact ball bearings The final decision of selection will be based on the cost of installation, including the shaft and the housing Example: Bearing Life Estimate the life of a radial contact ball bearing No 211 (C = 12 kN) for 90% reliability and the bearing reliability for 30,000 hours life based on [5] The application factor is 15 for light to moderate impact Radial load, Fr = 12 kN and thrust load, Ft = 15 kN Ft/Fr = 125

Summary

F Fe = Fr 1 + 1115 t 035 = 24 kN Fr The bearing life for 90% reliability, Kr = 1 1 C 3 Lhours = K r L R = 45920 h Fe K a nrpm 60

The bearing reliability for a 30000 hour life Lrev = 30000 h 1800 rpm 60 min/h = 3240 106 revolutions Kr =

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