4-7A step-transmission system is not self-synchronizing, and its limited number of steps does not permitdata to be transmitted smoothly or where relatively small changes in data are required. This type oftransmission system is cheap, rugged, and relatively powerful.Q-2.Compare the power sources of synchros and step-transmission systems.Q-3.A step transmitter is a modification of what electrical device?RESOLVERSThe last device we will discuss is the resolver. Physically, resolvers are similar to synchros, and areused to perform mathematical computations electrically. They are rotary electromechanical devices thatprovide outputs that are trigonometric functions of their inputs. As you may know, the branch ofmathematics that deals with the quantities and angles of a right triangle is known as trigonometry. Many"trig" problems that can be solved with paper and pencil can be solved by applying the proper electrical ormechanical quantities to a resolver. The resolver has the advantage of giving instantaneous solutions if theinput quantities are changing continuously.Resolvers are classified according to size (diameter) in the same manner as standard synchros andmay be mounted with most standard synchro mounting hardware. A cutaway view of a resolver is shownin figure 4-5.Figure 4-5.—Cutaway view of a resolver.Notice that the stator of the resolver is a cylindrical structure of slotted laminations on which twocoils are wound. The rotor is composed of a shaft, laminations, two windings, and four slip rings.Compensator components, which improve the angular accuracy of resolvers, may consist of resistors oradditional windings in the stator and rotor winding circuits. Compensator windings, which increase theaccuracy of the resolver, are located inside the stator. Compensating (calibrating) resistors, which
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