The bearing, the weak spot the battery was hiding
Bearing fluting can ruin an electric motor: a full replacement costs €8,000-9,000. Real failure or myth? The technical debate is heating up.
English · Original discussion in Spanish · Published
The bearing, the electric car's new headache
What if the weak point of an electric car isn't the battery, but a bearing? The technical debate has shifted focus: permanent magnet motors run at extremely high speeds, and stray currents generated by PWM inverters can cause so-called "fluting", pitting in steel bearings that eventually destroys them. High-end models use silicon nitride balls —ceramic— which eliminate the problem. The rest make do with plain steel bearings.
The cost of the failure is the real blow. Since the bearings are not sold separately, the only solution is to replace the entire motor: between €8,000 and €9,000. A bill that contradicts the promised "low maintenance".
Not everyone sees it the same way. Some argue it's a false myth: 300,000 kilometres equals about 4,000 hours of use, and within that range fluting doesn't appear. Others point out that the failure isn't electrical but mechanical: undersized motors, extreme rotational speeds and road-induced vibrations. The experience also varies by manufacturer: the Koreans are struggling; the Chinese and Europeans, so far, are not.
While some call it a "scam", others stress the technical nuance. The only certainty is that electric maintenance bills are starting to appear on the radar. And not always where expected.
What if the weak point of an electric car isn't the battery, but a bearing? The technical debate has shifted focus: permanent magnet motors run at extremely high speeds, and stray currents generated by PWM inverters can cause so-called "fluting", pitting in steel bearings that eventually destroys them. High-end models use silicon nitride balls —ceramic— which eliminate the problem. The rest make do with plain steel bearings.
The cost of the failure is the real blow. Since the bearings are not sold separately, the only solution is to replace the entire motor: between €8,000 and €9,000. A bill that contradicts the promised "low maintenance".
Not everyone sees it the same way. Some argue it's a false myth: 300,000 kilometres equals about 4,000 hours of use, and within that range fluting doesn't appear. Others point out that the failure isn't electrical but mechanical: undersized motors, extreme rotational speeds and road-induced vibrations. The experience also varies by manufacturer: the Koreans are struggling; the Chinese and Europeans, so far, are not.
While some call it a "scam", others stress the technical nuance. The only certainty is that electric maintenance bills are starting to appear on the radar. And not always where expected.
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (17 replies).
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