Which Parameters Of A DC Motor Determine Its Power Consumption?
Jan 14, 2026
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For DC motor products, efficiency is defined as the percentage of output power relative to input power. A higher efficiency indicates stronger work-performing capacity-meaning the motor generates more useful work with the same power consumption. This is precisely why the state advocates for the production and use of high-efficiency DC motor.
To illustrate the power consumption and work output, we take 200kW, 2P motors of different energy efficiency classes as specified in GB 18613-2020. The corresponding efficiencies for Class 1, Class 2, and Class 3 energy efficiency are 97.2%, 96.5%, and 95.8% respectively. We calculate the annual (365 days) power consumption and output work of 20 such motors.
| Energy Efficiency Class | Efficiency | Power Consumption (kWh) | Output Work (kWh) |
|---|---|---|---|
| Class 1 | 97.2% | 35,040,000 | 34,058,880 |
| Class 2 | 96.5% | 35,040,000 | 33,813,600 |
| Class 3 | 95.8% | 35,040,000 | 33,568,320 |
The above comparison shows the work output with the same power consumption.
The above comparison shows the work output with the same power consumption. Conversely, we can also analyze the power consumption of motors with different energy efficiencies when achieving the same output work.
| Energy Efficiency Class | Efficiency | Power Consumption (kWh) | Output Work (kWh) | Power Saved vs. Class 3 (kWh) |
| Class 1 | 97.2% | 35,040,000 | 36,049,383 | 526,817 |
| Class 2 | 96.5% | 35,040,000 | 36,310,881 | 265,319 |
| Class 3 | 95.8% | 35,040,000 | 36,576,200 | - |