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lab5 - MEEN 260 Texas A&M University Laboratory Manual...

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MEEN 260 Laboratory Manual Texas A&M University 1 E LECTROMECHANICAL M EASUREMENT --R ELAYS Created Oct. 31, 2001, A. Palazzolo Last updated Aug. 23, 2007, B. Rasmussen Purpose of the Experiment 1) Provide an opportunity to gain knowledge of an electromechanical device (relay). 2) Demonstrate how measurements can facilitate the learning process in (1). 3) Introduce the students to concepts, more fully developed in MEEN 364 such as steady state value, time constant, electromechanical system, measurement, etc. 4) Gain experience in force, current, resistance and flux density (B) measurements. Theory The Electromagnetic Relay Modern machinery and equipment contain many components that require simultaneous design of electrical and mechanical parts which function interdependently. Some examples include motors and generators that are studied in detail in ME 364. This interdependency is illustrated by the need of the motor (generator) to develop torque (voltage) which depends on current (shaft speed). The focus of this lab will be relays, switching devices that require minimal current to open and close circuits that may carry 100's of amps. This permits operation of high power equipment from remotely located low power switches that open or close the relay. The relay utilized in this lab is a MK4608 single pole-double throw switch, shown below.
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