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Part III
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Electromechanics
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Solenoid power ratings are dependent primarily on the current required by the coil, and on the coil resistance I 2 R is the primary power sink, and solenoids are therefore limited by the heat they can dissipate Solenoids can operated in continuous or pulsed mode The power rating depends on the mode of operation, and can be increased by adding hold-in resistors to the circuit to reduce the holding current required for continuous operation The hold resistor is switched into the circuit once the pull-in current required to pull the plunger has been applied, and the plunger has moved into place The holding current can be signi cantly smaller than the pull-in current
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A common method to reduce the solenoid holding current employs a normally closed (NC) switch in parallel with a hold-in resistor In Figure 1643, when the push button (PB) closes the circuit, full voltage is applied to the solenoid coil, bypassing the resistor through the NC switch, connecting the resistor in series with the coil The resistor will now limit the current to the value required to hold the solenoid in position
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Hold-in resistor PB switch NC switch VDC Solenoid coil
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Another electromechanical device that nds common application in industrial practice is the relay The relay is essentially an electromechanical switch that permits the opening and closing of electrical contacts by means of an electromagnetic structure similar to those discussed earlier in this section A relay such as would be used to start a high-voltage single-phase motor is shown in Figure 1644 The magnetic structure has dimensions equal to 1 cm on all sides, and the transverse dimension is 8 cm The relay works as follows When the push button is pressed, an electrical current ows through the coil and generates a eld in the magnetic structure The resulting force draws the movable part toward the xed part, causing an electrical contact to be made The advantage of the relay is that a relatively low-level current can be used to control the opening and closing
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Push-button start (momentary contact) 1 cm 1 cm 120 VAC Push-button stop N turns 1 cm 2 cm 1 cm To highvoltage load Movable structure C2 5 cm 240 VAC
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Figure 1644 A relay
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Principles of Electromechanics
of a circuit that can carry large currents In this particular example, the relay is energized by a 120-VAC contact, establishing a connection in a 240-VAC circuit Such relay circuits are commonly employed to remotely switch large industrial loads Circuit symbols for relays are shown in Figure 1645 An example of the calculations that would typically be required in determining the mechanical and electrical characteristics of a simple relay are given in Example 1612
NO Make, or normally open (NO) relay or single-pole, single throw, SPSTNO NC Break, or normally closed (NC) relay or single-pole, single throw, SPSTNC NC Break, make or single-pole, double throw SPDT (B-M), or transfer NO NC NO NC NO CT Make, break, or make-before-break or single-pole, double throw SPDT (M-B), or transfer, or continually transfer
Basic operation of the electromechanical relay: The (small) coil current i causes the relay to close (or open) and enables (interrupts) the larger current, I On the left: SPSTNO relay (magnetic field causes relay to close) On the right: SPSTNC relay (magnetic field causes relay to open)
Figure 1645 Circuit symbols and basic operation of relays
EXAMPLE 1612 A Relay
Problem
Figure 1646 depicts a simpli ed representation of a relay Determine the current required for the relay to make contact (ie, pull in the ferromagnetic plate) from a distance x
Part III
Electromechanics
Solution
Known Quantities: Relay geometry; restoring force to be overcome; distance between bar and relay contacts; number of coil turns Find: i
i N= 10,000 1 cm 5 cm 1 cm
05 cm
10 cm
frestore = 5 N; N = 10,000
Schematics, Diagrams, Circuits, and Given Data: Agap = (001 m)2 ; x = 005 m; Assumptions: Assume that the reluctance of the iron is negligible; neglect fringing Analysis:
Rgap (x) =
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