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Carbon Output Calculation of Electric Motors
Enhancing power efficiency and reducing carbon footprints are key trends today. Do you know how to calculate the CO2 emissions generated by your electric motors and which types of motors produce fewer emissions?
To calculate a motor's CO2 emissions, you need two essential pieces of information:
1. Power consumption (in kWh)
2. The CO2 emission factor (in kgCO2/kWh), provided by your electricity provider.
Using the following formula, you can estimate a motor's CO2 emissions:
**Formula for Calculating a Motor’s CO2 Emissions**
Motor’s CO2 emissions (kgCO2) = Motor's power consumption (kWh) * CO2 emission factor (kgCO2/kWh)
Please reach out to your nearest branch or sales office, or contact our Customer Support Center for specific power consumption details regarding each combination of AC motor and general inverter, as well as brushless motors.
The CO2 emission factors listed in the "List of Base Emission Coefficients by Electric Power Supplier" published by the Japanese Ministry of the Environment and Ministry of Economy, Trade, and Industry are commonly used. For other countries, you'll need to find this information. In the USA, power plants are required to provide this data.
For example, consider a 200W AC motor paired with an inverter (VFD). Under the assumption of 12 hours of operation per day and 300 operating days per year, with a CO2 emission factor of 0.470 kgCO2/kWh, the annual CO2 emissions would amount to approximately 521 kgCO2.
**Calculation Breakdown:**
Power consumption (1,109 kWh/year) * CO2 emission factor (0.470 kgCO2/kWh) = CO2 emissions (~521 kgCO2)
**Assumptions:**
- Operates 12 hours daily, 300 days annually.
- CO2 emission factor is 0.470 kgCO2/kWh.
- Example refers to a standard 200W output BH Series 3-phase AC induction motor combined with an inverter (VFD).
If you opt for a brushless motor with the same 200W output, you can significantly reduce annual CO2 emissions to around 386 kgCO2 under similar conditions. This represents about a 25% reduction compared to using an AC motor.
**Calculation Breakdown:**
Power consumption (821 kWh/year) * CO2 emission factor (0.470 kgCO2/kWh) = CO2 emissions (~386 kgCO2)
**Assumptions:**
- Operates 12 hours daily, 300 days annually.
- CO2 emission factor is 0.470 kgCO2/kWh.
- Example refers to a 200W output BMU Series brushless motor.
This means that replacing a 200W AC motor with an inverter (VFD) with a brushless motor system of equal specifications can reduce CO2 emissions by 135 kgCO2 annually. This is roughly equivalent to the annual CO2 emissions of one refrigerator.
For a family refrigerator with a capacity of 450 liters, the annual CO2 emissions are approximately 135 kgCO2. (Source: Japan’s Ministry of the Environment’s Energy-Saving Product Replacement Navigation System Shinkyu-san)
Why are brushless motors more efficient?
Brushless motors utilize permanent magnets to enhance magnetic flux, resulting in lower losses compared to AC motors. One major advantage is the absence of secondary copper losses, making brushless motors highly efficient and allowing them to perform the same tasks using less power. Their higher efficiency also enables smaller and lighter motor designs, contributing to resource conservation.
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On a side note, electrically commutated (EC) fans equipped with onboard brushless motors can also lead to energy savings. When comparing speed control technologies, brushless motors offer numerous benefits over AC motors.
Takeaways:
- A motor’s CO2 emissions (kgCO2) can be calculated by multiplying its power consumption (kWh) by the CO2 emission factor (kgCO2/kWh).
- High-efficiency brushless motors are excellent for reducing CO2 emissions.
- Switching from an AC motor to a brushless motor can decrease annual CO2 emissions by an amount equivalent to the emissions of one refrigerator.
For more insights on reducing energy consumption and carbon emissions, check out our carbon neutrality page.
For a consultation on achieving carbon neutrality, consider scheduling a technical seminar.
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