Ball Mill Motor Retrofit in The Building Materials Industry
Case Study
Before
The original system used a traditional asynchronous motor + gearbox drive, which resulted in:
- High energy consumption
- Complex transmission structure
- Frequent maintenance requirements
Motor Type: Asynchronous Motor
Rated Power: 200 kW
Control Method: Star-delta starting (50 Hz)
Transmission: Gearbox (ratio 1:4)
After
Solution: Permanent Magnet Synchronous Motor (PMSM) + Variable Frequency Drive (VFD)
Average operating power: 105.5 kW
Maximum power reduced from 128 kW → 114 kW
Daily energy consumption reduced from:
2952 kWh → 2532 kWh
Energy saving rate: 14.2%
Annual Energy Savings
Annual saving: 147,000 kWh
Electricity cost saving: ≈ 13650＄/year
Maintenance Savings
Gearbox lubrication & service: ≈ 457＄/year