Electromechanical Devices & Components Illustrated by Brian Elliott

By Brian Elliott

Master the main components of electromechanical components

Essential to the layout, fix, or operation of your electromechanical units, this quick-find reference presents illustrations, descriptions, and proper calculations for 2,000 time-tested electromechanical components.

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Extra resources for Electromechanical Devices & Components Illustrated Sourcebook (Mechanical Engineering)

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Placing 1 pound of force (FA) on the left end of the beam, generates 3 pounds of force (FG) at the point within the beam. The amount of travel is also transformed. In the illustration, 12 inches of motion (MA) on the left end of the beam translates to 4 inches of motion (MG) at Chapter 2 Basic Mechanics 11 Connecting Rod 1 Pound of Force Applied (FA) Total Beam Length (L) 3 Pounds of Force Generated (FG) 2/3 of the Beam Length 1/3 (X) First Class Lever Fixed Pivot Fixed Pivot 12" of Motion Applied (MA) 4" of Motion Generated (MG) Fulcrum Figure 2-7 Levers and Connecting Rods Beam Figure 2-5 Second Class Lever the point within the beam.

5Њ (A). The amount of force required In addition to their fastening value, screws are used extensively for motion control. Figure 2-23 shows a sectional view of a motorized screw thread actuator. In this case a piston, with a threaded nut at its base, is inserted into a guide tube. When the threaded shaft is turned, the piston moves in and out, depending on the rotation. The threaded shaft is driven by a toothed belt connected to a direct current (DC) motor. By reversing the polarity of the motor, the actuator can be Chapter 2 Toothed Belt Drive Pulley DC Motor Piston Head Nut Guide Housing Piston Tube Threaded Shaft Basic Mechanics 15 through elastic deflection.

As the acid acts on the zinc, zinc sulfate forms and drops off the electrode, leaving behind an excess number of electrons. As a surplus of electrons builds up on the zinc, or negative electrode, a difference in potential is established. When the battery is fully charged the stored energy is available for applications. It should also be noted that during the charging operation, hydrogen forms on the copper, or positive electrode, and bubbles up to the top of the electrolyte. Figure 3-10 shows a cut-away view of a typical 6-volt lead/acid battery.

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