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Electric Motor Efficiency, Loss Segregation & Energy Waste Calculator

Calculate electric motor losses (copper, iron core, friction), IEC efficiency classes (IE1–IE5), and wasted power costs.

Input Parameters

kW

e.g. 22 kW (30 HP) motor

kW
hrs/yr

4,000 hrs/yr is typical 2-shift commercial operation; 8,000 hrs is continuous 24/7

¢/kWh

Calculation Results

Motor Operating Efficiency (η)
90.91% (IE2 High Efficiency)
Total Power Dissipated as Heat
2.2 kW (2.95 HP loss)
Annual Cost of Thermal Losses
$2,464 / year (8,800 kWh wasted)
Total Annual Electricity Bill
$27,104 / year (@ 4,000 hrs/yr)
Copper I²R Thermal Losses (58%)
1.28 kW ($1429/yr)
Core Magnetic & Mechanical Losses
Iron Core: 0.48 kW | Friction/Windage: 0.31 kW
Summary: At 22 kW output and 24.2 kW input, the motor operates at 90.91% efficiency (IE2 High Efficiency). It dissipates 2.2 kW of heat energy, costing $2,464 annually in wasted power over 4,000 operational hours.

Visual Growth Breakdown

Step-by-Step Calculation Solution
1.Efficiency η = (P_mech ÷ P_elec) × 100 = (22 kW ÷ 24.2 kW) × 100 = 90.91%
2.Total Heat Loss = P_elec - P_mech = 24.2 kW - 22 kW = 2.2 kW
3.Annual Wasted Energy = 2.2 kW × 4000 hrs = 8800 kWh
4.Annual Cost of Losses = 8800 kWh × $0.28/kWh = $2464/year

Formula & How Electric Motor Efficiency, Loss Segregation & Energy Waste Calculator Works

Mathematical Formula
Efficiency η = (P_mech ÷ P_elec) × 100 | Losses = P_elec - P_mech | Cost = Wasted kWh × ($/kWh)

Electric motor losses are categorized under IEC 60034-2-1 into load-dependent stator and rotor $I^2R$ resistive heating (55–60%), core magnetic hysteresis and eddy current losses (20–25%), mechanical bearing friction and cooling fan windage (10–15%), and stray load losses (5%).

How to Calculate Electric Motor Efficiency, Loss Segregation & Energy Waste Calculator (Step-by-Step)
  1. Enter Shaft Mechanical Output Power (kW) (kW): Input your target parameter value.
  2. Enter Electrical Input Power Drawn (kW) (kW): Input your target parameter value.
  3. Enter Annual Operating Hours (hrs/yr): Input your target parameter value.
  4. Enter Electricity Tariff (¢/kWh) (¢/kWh): Input your target parameter value.
  5. Apply Formula: Calculate using Efficiency η = (P_mech ÷ P_elec) × 100 | Losses = P_elec - P_mech | Cost = Wasted kWh × ($/kWh).
  6. Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)

What is the difference between IE3 and IE4 electric motors?

IE3 (Premium Efficiency) motors achieve ~92.5–94% efficiency for typical industrial sizes, while IE4 (Super-Premium) and IE5 (Ultra-Premium SynRM) reduce electrical losses by a further 15–20%, saving thousands of dollars in lifetime power bills.

Official Regulatory & Government Data Sources

Authoritative Standards & Verified Reference Citations

Independent & Verified

Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:

Standards AustraliaOfficial Standard
Peak Non-Government Standards Organization

Australian Standards including AS/NZS 3000 (Wiring Rules), AS 3600 (Concrete Structures), and AS 4100 (Steel Structures).

www.standards.org.au
Engineers AustraliaIndustry Partner
National Engineering Professional Body

Accreditation and technical guidelines for civil, structural, mechanical, and electrical engineering.

www.engineersaustralia.org.au

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