Logic-level outputs can’t drive a motor directly. Solution: Relays –Relays allow one circuit to...
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Transcript of Logic-level outputs can’t drive a motor directly. Solution: Relays –Relays allow one circuit to...
• Logic-level outputs can’t drive a motor directly.
• Solution: Relays– Relays allow one circuit to
switch a second circuit– isolates circuit from potentially
dangerous voltages
• Advantages• little power to energize• Quiet
• Disadvantages• Can’t control large loads• Contacts can weld
together
• Advantages• Can handle very large loads• Control multiple contacts
• Disadvantages• Physically large• Mechanical failure
• Mechanical– Converts rotary motion of a knob or handle into linear
displacement via screw or gears • Pneumatic / Hydraulic
– Compressed air moves a piston inside the cylinder which moves the actuator directly.
• Lead Screw– Converts rotary motion via motor into linear
displacement. A lead screw with helical threads machined on its circumference rotates, while a nut with corresponding helical threads moves the actuator linearly.
- Uses electrical energy to produce mechanical work- Commonly used in refrigerators, washing machines, fans, pumps, and computer equipment
Advantages
- No fossil fuels
- Noise reduction
- Wide range of sizes
- Fewer components
Disadvantages
- Less powerful
- Battery limitations