Demagnetization and energy storage motor power supply

What causes demagnetization fault in permanent magnet synchronous motors (PMSMs)?

Due to possible overheat, abrasion or mechanical vibrations, demagnetization fault is inevitable in permanent magnet synchronous motors (PMSMs), which could greatly decrease the motor’s efficiency and hence an electrified vehicle’s performance.

How does gradual demagnetization affect PM motor efficiency?

Tentatively, every 1% drop in efficiency due to gradual demagnetization is equivalent to a loss in the NVP of about 1% of the PM motor cost. While designers focus on having a high flux density in PM motors, avoidance of demagnetization is an important objective to be focused upon due to its strong impact of PM motor financial feasibility.

Is magnet demagnetization feasible in Egypt?

Magnet demagnetization decreases efficiency, lifetime and feasibility of motors. Despite partial demagnetization, utilization of PM motors in Egypt is feasible. Feasibility of PM motors in Egypt is contingent on a 50% annual utilization. Consideration of potential demagnetization is essential for estimating feasibility.

What causes a magnet to demagnetize?

This can take place when the magnet is subjected to fields or temperature beyond the design values. In addition, physical impact can cause demagnetization. Depending on the intensity of the incident, the magnet can either be partially or fully demagnetized.

How to understand motor efficiency variation when demagnetization fault happens?

In order to better understand the motor efficiency variation when demagnetization fault happens, various experiments have been conducted to imitate demagnetization. Most of them use permanent magnet demolition method to achieve this target.

Why is gradual demagnetization important?

This points to the importance of ensuring PM motors have low gradual demagnetization pace rather than focusing on improving avoidance of incidences leading to sudden loss of magnetization. Tentatively, every 1% drop in efficiency due to gradual demagnetization is equivalent to a loss in the NVP of about 1% of the PM motor cost.