Case Study: 8% Energy Savings with PMSM Retrofit on a Ball Mill
H1: Case Study: 8% Energy Savings with PMSM Retrofit on a Ball Mill
The ball mill operates with high energy consumption and continuous heavy load. In this on-site upgrade, the power cost was reduced without changing the existing belt driven mechanical settings. This solution replaces traditional induction motors and can handle high starting torque and continuous grinding loads.
H2: The Retrofit Solution: Belt-Driven PMSM Installation
As seen in the site photo, the factory successfully replaced their original asynchronous motor with a Permanent Magnet Synchronous Motor (PMSM). The new motor is directly coupled to the existing multi-groove pulley system, ensuring a smooth transition with zero mechanical redesign.
H2: Specification and comparison of gear reduction motors
Here is the direct comparison of the retrofit:
| Parameter | Original Induction Motor | New Permanent Magnet Motor |
|---|---|---|
| Model | Y280S-4-75kW | TYP280S-75kW |
| Drive System | Multi-groove V-belt | Multi-groove V-belt (Retained) |
| Power Rating | 75 kW | 75 kW |
| Energy Efficiency | Standard IE2/IE3 | Ultra-high (IE4/IE5 equivalent) |
| Rotor Loss | High (Copper loss) | Zero (Permanent magnets) |
H3: Measured Field Results: 8% Energy Saving & Stable Operation
After commissioning, the field data confirmed the upgrade was a success:
8% Energy Saving: The PMSM maintains high efficiency even under partial or fluctuating loads, directly reducing OPEX.
Smoother Operation: The PM motor runs significantly cooler and generates less vibration, extending the lifespan of the belts and bearings.
High Power Factor: Reduced reactive power penalties for the plant.