Demagnetization in Large Permanent Magnet Motors

We’ve discussed how SMPM technology drives higher efficiency and power density, and how large PM machines have become strategic assets across multiple industries.

But one key question remains: what should users understand about Demagnetization (DI)? Every decision‑maker should be interested in this topic, especially when PM motors are expected to deliver reliability, stability, and long service life.

Demagnetization occurs when a magnet operates beyond it safe limits, driven by temperature, opposing magnetic fields, or a combination of both. In large machines, the risk is amplified because of scale, thermal gradients, and starting condition scenarios.

If you have a disruptive mindset toward the future of technologies used in modern compression trains and electrified processes worldwide, review the information below.