Capstone – Motor Energy Costs: Duty Cycles, Efficiency Classes, a Variable-Speed Fan & Payback
This lesson is part of the course
In this lesson
You price four options for a fictional 22 kW fan motor over its yearly duty cycle: keep the old motor, buy a more efficient one, or add a variable-speed drive that uses the cube law of fans – yearly kWh, cost, investment and payback.
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Lessons in this course
- Ideal Transformers: Turns Ratio, Voltages, Currents, Apparent Power & Impedance Seen ThroughFree
- Equivalent Circuit & Voltage Regulation: |Z|, Per-Unit Impedance and Phasors in Two Columns Locked
- Efficiency at Every Load: Fixed Core Loss, Copper Loss ∝ Load², Maximum Efficiency & All-Day Efficiency Locked
- DC Motors: Back-EMF, Speed and Torque, the Speed–Torque Line & a Starting Resistor Locked
- Induction Motors – Speed & Slip: Synchronous Speed, Slip, Rotor Frequency and Speed at Part Load Locked
- Induction Motors – Power Flow: Air-Gap Power, Rotor Copper Loss = s·P_ag, Shaft Torque & an Energy-Flow Chart Locked
- The Torque–Slip Curve: Starting, Maximum and Rated Torque, the Stable Region & the Operating Point Locked
- Capstone – Motor Energy Costs: Duty Cycles, Efficiency Classes, a Variable-Speed Fan & Payback Locked