Discussion #27 – Motors ECEN 301 1 Faith and Works James 2:17-18 17 Even so faith, if it hath not work, is dead, being alone. 18 Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without they works, and I will shew thee my faith by my works.
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Discussion #27 – MotorsECEN 3011 Faith and Works James 2:17-18 17 Even so faith, if it hath not work, is dead, being alone. 18 Yea, a man may say, Thou.
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Discussion #27 – MotorsECEN 301 1
Faith and Works
James 2:17-18
17 Even so faith, if it hath not work, is dead, being alone.
18 Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without they works, and I will shew thee my faith by my works.
Discussion #27 – MotorsECEN 301 2
Lecture 27 – Motors & Transformers
Solenoids – a simple motor• Use coil to pull (or push) plunger – a “solenoid”
• Current-induced magnetic field is concentrated in core• Field attempts to “center” the core, which can pull or push plunger
• Other configurations such as a rotary solenoid are common• Relays (electrically operated mechanical switch)
Rotary
Pull/push solenoid
Electro-mechanical Relay• Solenoid used to close a switch
• AC or DC can be used to energize coils• Energized coil pulls plunger or lever which closes switch
contacts• Adding a permanent magnet can make a “holding” relay
• Toggle by energizing• Rotary relays• Relay logic• Solid-state relays
Electromechanical Relay
Ladder logic w/relays
Loudspeakers• Moving “voice coil” is attached to a
diagram• Creates high frequency air movement
(vibration) to couple electrical energy to acoustic energy
• Diaphragm size/shape optimized for frequency range