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New Energy Vehicle Traction Motor: From 30% Noise Exceedance to Meeting International NVH Standards
Background:
Before Retrofit:
- Permanent magnet direct drive
- Closed-loop control system
- High efficiency and reliability
The retrofit project replaced the original system with a Permanent Magnet Synchronous Motor (PMSM) solution. This upgrade eliminated the need for a gearbox, simplified the structure, and significantly improved energy efficiency.
Solution And After Retrofit:
Permanent magnet direct drive
Closed-loop control system
High efficiency and reliability
The retrofit project replaced the original system with a Permanent Magnet Synchronous Motor (PMSM) solution. This upgrade eliminated the need for a gearbox, simplified the structure, and significantly improved energy efficiency.
Energy-Saving Results with PMSM Retrofit
- 12% Energy Saving Rate
- ¥212,000 Annual Electricity Savings
- 33% Investment Return Rate
Thanks to the Permanent Magnet Synchronous Motor, the grinding system achieved a 12% reduction in electricity consumption. For a factory with 3 grinding lines, the total energy cost savings over 10 years is estimated at ¥2.128 million.
Payback period: 3 years
System upgraded: 3 grinding mills
| Comparison Dimension | Status Before Retrofit | Status After Retrofit | Variation/Savings |
|---|---|---|---|
| Motor Rated Power (kW) | 7.5 | 7.5 | No change (power remains the same) |
| Daily Average Operating Hours (h) | 20 | 20 | No change (operation mode remains the same) |
| Daily Average Power Consumption (kWh) | 142 (calculated at an average efficiency of 85%) | 118 (calculated at an average efficiency of 92%) | Decrease by 24 kWh/day |
| Monthly Average Power Consumption (kWh) | 4260 (calculated based on 30 days) | 3540 (calculated based on 30 days) | Decrease by 720 kWh/month |
| Electricity Rate per Unit (RMB/kWh) | 0.65 | 0.65 | No change (electricity price remains the same) |
| Monthly Average Electricity Cost (RMB) | 2769 | 2301 | Savings of 468 RMB/month |
| Annual Average Electricity Cost (RMB) | 33228 (calculated based on 12 months) | 27612 (calculated based on 12 months) | Savings of 5616 RMB/year |
| Total Retrofit Investment (RMB) | - | 4800 | - |
| Investment Payback Period (Months) | - | 10.3 (4800 ÷ 468 ≈ 10.3) | - |
